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Hurricane Isaias Public Advisory Number 28
2020-08-04 04:48:59| National Hurricane Center (Atlantic)
Issued at 1100 PM EDT Mon Aug 03 2020 959 WTNT34 KNHC 040248 TCPAT4 BULLETIN Hurricane Isaias Advisory Number 28 NWS National Hurricane Center Miami FL AL092020 1100 PM EDT Mon Aug 03 2020 ...HURRICANE CONDITIONS SPREADING ONTO THE COAST OF EASTERN SOUTH CAROLINA AND SOUTHEASTERN NORTH CAROLINA... ...STRONG WINDS AND HEAVY RAINFALL LIKELY FROM THE EASTERN CAROLINAS TO THE MID-ATLANTIC COAST TONIGHT AND TUESDAY... SUMMARY OF 1100 PM EDT...0300 UTC...INFORMATION ----------------------------------------------- LOCATION...33.8N 78.5W ABOUT 25 MI...40 KM ENE OF MYRTLE BEACH SOUTH CAROLINA ABOUT 50 MI...80 KM SW OF WILMINGTON NORTH CAROLINA MAXIMUM SUSTAINED WINDS...85 MPH...140 KM/H PRESENT MOVEMENT...NNE OR 20 DEGREES AT 22 MPH...35 KM/H MINIMUM CENTRAL PRESSURE...988 MB...29.18 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: A Storm Surge Warning is now in effect from Ocracoke Inlet North Carolina to Oregon Inlet North Carolina. A Tropical Storm Warning is now in effect north of Stonington Maine to Eastport Maine. The Tropical Storm Warning and Storm Surge Warning south of the South Santee River has been discontinued. SUMMARY OF WATCHES AND WARNINGS IN EFFECT: A Storm Surge Warning is in effect for... * South Santee River South Carolina to Cape Fear North Carolina * Pamlico and Albemarle Sounds, including the Neuse and Pamlico Rivers * Ocracoke Inlet North Carolina to the North Carolina/Virginia border A Storm Surge Watch is in effect for... * Cape Fear to Ocracoke Inlet North Carolina A Hurricane Warning is in effect for... * South Santee River South Carolina to Surf City North Carolina A Tropical Storm Warning is in effect for... * North of Surf City North Carolina to Eastport Maine * Pamlico and Albemarle Sounds * Chesapeake Bay * Tidal Potomac River * Delaware Bay * Long Island and Long Island Sound * Martha's Vineyard, Nantucket, and Block Island A Storm Surge Warning means there is a danger of life-threatening inundation, from rising water moving inland from the coastline, in the indicated locations. For a depiction of areas at risk, please see the National Weather Service Storm Surge Watch/Warning Graphic at hurricanes.gov. This is a life-threatening situation. Persons located within these areas should take all necessary actions to protect life and property from rising water and the potential for other dangerous conditions. Promptly follow evacuation and other instructions from local officials. A Storm Surge Watch means there is a possibility of life- threatening inundation, from rising water moving inland from the coastline. A Hurricane Warning means that hurricane conditions are expected somewhere within the warning area. A Tropical Storm Warning means that tropical storm conditions are expected somewhere within the warning area, generally within 36 hours. For storm information specific to your area, including possible inland watches and warnings, please monitor products issued by your local National Weather Service forecast office. DISCUSSION AND OUTLOOK ---------------------- At 1100 PM EDT (0300 UTC), the center of Hurricane Isaias was located near latitude 33.8 North, longitude 78.5 West. Isaias is moving toward the north-northeast near 22 mph (35 km/h), and this general motion accompanied by a gradual increase in forward speed is expected through tonight followed by a further increase in the forward speed on Tuesday. On the forecast track, the center of Isaias will make landfall in southern North Carolina during the next hour or two, then move across eastern North Carolina for the rest of the night. The center move near or along the coast of the mid-Atlantic states on Tuesday, and continue across the northeastern United States Tuesday night. Maximum sustained winds are near 85 mph (140 km/h) with higher gusts. Little change in strength is expected before landfall. After landfall, only gradual weakening is anticipated after Isaias makes landfall in the Carolinas and moves across the U.S. mid-Atlantic region tonight and Tuesday. Hurricane-force winds extend outward up to 25 miles (35 km) from the center and tropical-storm-force winds extend outward up to 125 miles (205 km). A station at Frying Pan Shoals, North Carolina, recently reported sustained winds of 72 mph (116 km/h) and a wind gust of 93 mph (150 km/h). The estimated minimum central pressure is 988 mb (29.18 inches). HAZARDS AFFECTING LAND ---------------------- Key messages for Isaias can be found in the Tropical Cyclone Discussion under AWIPS header MIATCDAT4, WMO header WTNT44 KNHC, and on the web at www.hurricanes.gov/text/MIATCDAT4.shtml. STORM SURGE: The combination of a dangerous storm surge and the tide will cause normally dry areas near the coast to be flooded by rising waters moving inland from the shoreline. The water could reach the following heights above ground somewhere in the indicated areas if the peak surge occurs at the time of high tide... South Santee River SC to Cape Fear NC...3-5 ft Edisto Beach to South Santee River SC...1-3 ft Cape Fear to Ocracoke Inlet NC...2-4 ft Ocracoke Inlet to the North Carolina/Virginia border including Pamlico Sound, Albemarle Sound, Neuse and Pamlico Rivers...3-5 ft North of the North Carolina/Virginia border to Martha's Vineyard including the Chesapeake Bay, the Tidal Potomac River, Delaware Bay, Long Island Sound, Block Island Sound, Narragansett Bay, Buzzards Bay, and Vineyard Sound...1-3 ft The deepest water will occur along the immediate coast in areas of onshore winds, where the surge will be accompanied by large waves. Surge-related flooding depends on the relative timing of the surge and the tidal cycle, and can vary greatly over short distances. For information specific to your area, please see products issued by your local National Weather Service forecast office. WIND: Hurricane conditions are spreading across the southern portion of the hurricane warning area in South and North Carolina at this time, with tropical storm conditions spreading onshore farther to the north. Widespread tropical-storm conditions are expected in the tropical storm warning area from coastal North Carolina to the mid-Atlantic states, including portions of the Chesapeake Bay region, later tonight and Tuesday, with wind gusts to hurricane force possible. These winds could cause tree damage and power outages. Tropical storm conditions are expected to reach southern New England Tuesday afternoon and northern New England Tuesday night and early Wednesday. Gale-force winds are expected to spread into southeastern Quebec Tuesday night and Wednesday. See products issued by Environment Canada for more information. RAINFALL: The following rainfall accumulations are expected along and near the track of Isaias: Carolinas and the Mid-Atlantic: 3 to 6 inches, isolated maximum totals 8 inches. Eastern New York and western New England from Connecticut to New Hampshire: 2 to 4 inches, isolated maximum totals 6 inches. Western and northern Maine: 1 to 3 inches. Heavy rainfall along the East Coast, near the path of Isaias, will result in flash and urban flooding, some of which may be significant in the eastern Carolinas, Mid-Atlantic and Northeast through Wednesday. Widespread minor to moderate river flooding is possible across portions of the Carolinas and the Mid-Atlantic. Quick-responding rivers in Northeast will also be susceptible to minor river flooding. TORNADOES: A few tornadoes will be possible across eastern North Carolina tonight, and from eastern Virginia northeastward into southern New England on Tuesday. SURF: Swells generated by Isaias are affecting portions of the Bahamas and the southeast coast of the United States and will spread northward along the U.S. east coast during the next couple of days. These swells are likely to cause life-threatening surf and rip current conditions. Please consult products from your local weather office. NEXT ADVISORY ------------- Next intermediate advisory at 200 AM EDT. Next complete advisory at 500 AM EDT. $$ Forecaster Beven
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Hurricane Isaias Forecast Advisory Number 28
2020-08-04 04:48:29| National Hurricane Center (Atlantic)
Issued at 0300 UTC TUE AUG 04 2020 000 WTNT24 KNHC 040248 TCMAT4 HURRICANE ISAIAS FORECAST/ADVISORY NUMBER 28 NWS NATIONAL HURRICANE CENTER MIAMI FL AL092020 0300 UTC TUE AUG 04 2020 CHANGES IN WATCHES AND WARNINGS WITH THIS ADVISORY... A STORM SURGE WARNING IS NOW IN EFFECT FROM OCRACOKE INLET NORTH CAROLINA TO OREGON INLET NORTH CAROLINA. A TROPICAL STORM WARNING IS NOW IN EFFECT NORTH OF STONINGTON MAINE TO EASTPORT MAINE. THE TROPICAL STORM WARNING AND STORM SURGE WARNING SOUTH OF THE SOUTH SANTEE RIVER HAS BEEN DISCONTINUED. SUMMARY OF WATCHES AND WARNINGS IN EFFECT... A STORM SURGE WARNING IS IN EFFECT FOR... * SOUTH SANTEE RIVER SOUTH CAROLINA TO CAPE FEAR NORTH CAROLINA * PAMLICO AND ALBEMARLE SOUNDS...INCLUDING THE NEUSE AND PAMLICO RIVERS * OCRACOKE INLET NORTH CAROLINA TO THE NORTH CAROLINA/VIRGINIA BORDER A STORM SURGE WATCH IS IN EFFECT FOR... * CAPE FEAR TO OCRACOKE INLET NORTH CAROLINA A HURRICANE WARNING IS IN EFFECT FOR... * SOUTH SANTEE RIVER SOUTH CAROLINA TO SURF CITY NORTH CAROLINA A TROPICAL STORM WARNING IS IN EFFECT FOR... * NORTH OF SURF CITY NORTH CAROLINA TO EASTPORT MAINE * PAMLICO AND ALBEMARLE SOUNDS * CHESAPEAKE BAY * TIDAL POTOMAC RIVER * DELAWARE BAY * LONG ISLAND AND LONG ISLAND SOUND * MARTHA'S VINEYARD...NANTUCKET...AND BLOCK ISLAND A STORM SURGE WARNING MEANS THERE IS A DANGER OF LIFE-THREATENING INUNDATION...FROM RISING WATER MOVING INLAND FROM THE COASTLINE... IN THE INDICATED LOCATIONS. FOR A DEPICTION OF AREAS AT RISK... PLEASE SEE THE NATIONAL WEATHER SERVICE STORM SURGE WATCH/WARNING GRAPHIC AT HURRICANES.GOV. THIS IS A LIFE-THREATENING SITUATION. PERSONS LOCATED WITHIN THESE AREAS SHOULD TAKE ALL NECESSARY ACTIONS TO PROTECT LIFE AND PROPERTY FROM RISING WATER AND THE POTENTIAL FOR OTHER DANGEROUS CONDITIONS. PROMPTLY FOLLOW EVACUATION AND OTHER INSTRUCTIONS FROM LOCAL OFFICIALS. A STORM SURGE WATCH MEANS THERE IS A POSSIBILITY OF LIFE- THREATENING INUNDATION...FROM RISING WATER MOVING INLAND FROM THE COASTLINE. A HURRICANE WARNING MEANS THAT HURRICANE CONDITIONS ARE EXPECTED SOMEWHERE WITHIN THE WARNING AREA. A TROPICAL STORM WARNING MEANS THAT TROPICAL STORM CONDITIONS ARE EXPECTED SOMEWHERE WITHIN THE WARNING AREA...GENERALLY WITHIN 36 HOURS. HURRICANE CENTER LOCATED NEAR 33.8N 78.5W AT 04/0300Z POSITION ACCURATE WITHIN 20 NM PRESENT MOVEMENT TOWARD THE NORTH-NORTHEAST OR 20 DEGREES AT 19 KT ESTIMATED MINIMUM CENTRAL PRESSURE 988 MB EYE DIAMETER 30 NM MAX SUSTAINED WINDS 75 KT WITH GUSTS TO 90 KT. 64 KT....... 20NE 20SE 20SW 0NW. 50 KT....... 50NE 50SE 40SW 30NW. 34 KT.......110NE 110SE 70SW 60NW. 12 FT SEAS..120NE 180SE 90SW 30NW. WINDS AND SEAS VARY GREATLY IN EACH QUADRANT. RADII IN NAUTICAL MILES ARE THE LARGEST RADII EXPECTED ANYWHERE IN THAT QUADRANT. REPEAT...CENTER LOCATED NEAR 33.8N 78.5W AT 04/0300Z AT 04/0000Z CENTER WAS LOCATED NEAR 32.8N 79.1W FORECAST VALID 04/1200Z 37.0N 76.8W...INLAND MAX WIND 60 KT...GUSTS 75 KT. 50 KT... 50NE 50SE 20SW 20NW. 34 KT...110NE 120SE 40SW 60NW. FORECAST VALID 05/0000Z 42.0N 73.8W...INLAND MAX WIND 50 KT...GUSTS 65 KT. 50 KT... 20NE 50SE 0SW 0NW. 34 KT...110NE 140SE 40SW 50NW. FORECAST VALID 05/1200Z 46.8N 70.4W...INLAND MAX WIND 40 KT...GUSTS 55 KT. 34 KT...120NE 160SE 40SW 40NW. FORECAST VALID 06/0000Z 50.8N 68.3W...POST-TROP/EXTRATROP MAX WIND 30 KT...GUSTS 45 KT. FORECAST VALID 06/1200Z 52.9N 66.3W...POST-TROP/EXTRATROP MAX WIND 25 KT...GUSTS 35 KT. FORECAST VALID 07/0000Z...DISSIPATED REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 33.8N 78.5W INTERMEDIATE PUBLIC ADVISORY...WTNT34 KNHC/MIATCPAT4...AT 04/0600Z NEXT ADVISORY AT 04/0900Z $$ FORECASTER BEVEN
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Hurricane Isaias Public Advisory Number 27A
2020-08-04 02:01:02| National Hurricane Center (Atlantic)
Issued at 800 PM EDT Mon Aug 03 2020 000 WTNT34 KNHC 040000 CCA TCPAT4 BULLETIN Hurricane Isaias Intermediate Advisory Number 27A...Corrected NWS National Hurricane Center Miami FL AL092020 800 PM EDT Mon Aug 03 2020 Corrected to add extent of hurricane-force winds and surface ob ...ISAIAS REGAINS HURRICANE STRENGTH AND IS EXPECTED TO MAKE LANDFALL TONIGHT WITH DANGEROUS WINDS AND STORM SURGE... ...STRONG WINDS AND HEAVY RAINFALL LIKELY FROM THE EASTERN CAROLINAS TO THE MID-ATLANTIC COAST TONIGHT AND TUESDAY... SUMMARY OF 800 PM EDT...0000 UTC...INFORMATION ---------------------------------------------- LOCATION...32.8N 79.0W ABOUT 60 MI...100 KM E OF CHARLESTON SOUTH CAROLINA ABOUT 60 MI...100 KM S OF MYRTLE BEACH SOUTH CAROLINA MAXIMUM SUSTAINED WINDS...75 MPH...120 KM/H PRESENT MOVEMENT...NNE OR 15 DEGREES AT 16 MPH...26 KM/H MINIMUM CENTRAL PRESSURE...988 MB...29.18 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: The Tropical Storm Warning south of Edisto Beach has been discontinued. The Storm Surge Warning south of Folly Beach has been discontinued. SUMMARY OF WATCHES AND WARNINGS IN EFFECT: A Storm Surge Warning is in effect for... * Folly Beach South Carolina to Cape Fear North Carolina * Pamlico and Albemarle Sounds, including the Neuse and Pamlico Rivers * Oregon Inlet North Carolina to the North Carolina/Virginia border A Storm Surge Watch is in effect for... * Cape Fear to Oregon Inlet North Carolina A Hurricane Warning is in effect for... * South Santee River South Carolina to Surf City North Carolina A Tropical Storm Warning is in effect for... * Edisto Beach South Carolina to South Santee River South Carolina * North of Surf City North Carolina to Stonington Maine * Pamlico and Albemarle Sounds * Chesapeake Bay * Tidal Potomac River * Delaware Bay * Long Island and Long Island Sound * Martha's Vineyard, Nantucket, and Block Island A Tropical Storm Watch is in effect for... * North of Stonington to Eastport Maine A Storm Surge Warning means there is a danger of life-threatening inundation, from rising water moving inland from the coastline, in the indicated locations. For a depiction of areas at risk, please see the National Weather Service Storm Surge Watch/Warning Graphic at hurricanes.gov. This is a life-threatening situation. Persons located within these areas should take all necessary actions to protect life and property from rising water and the potential for other dangerous conditions. Promptly follow evacuation and other instructions from local officials. A Storm Surge Watch means there is a possibility of life- threatening inundation, from rising water moving inland from the coastline. A Hurricane Warning means that hurricane conditions are expected somewhere within the warning area. A Tropical Storm Warning means that tropical storm conditions are expected somewhere within the warning area, generally within 36 hours. A Tropical Storm Watch means that tropical storm conditions are possible within the watch area, generally within 48 hours. For storm information specific to your area, including possible inland watches and warnings, please monitor products issued by your local National Weather Service forecast office. DISCUSSION AND OUTLOOK ---------------------- At 800 PM EDT (0000 UTC), the center of Hurricane Isaias was located by NOAA Doppler weather radars and an Air Force Reserve Hurricane Hunter aircraft near latitude 32.8 North, longitude 79.0 West. Isaias is moving toward the north-northeast near 16 mph (26 km/h), and this general motion accompanied by a gradual increase in forward speed is expected through tonight followed by a further increase in the forward speed on Tuesday. On the forecast track, the center of Isaias will approach the coasts of northeastern South Carolina and southern North Carolina within the hurricane warning area during the next few hours. The center will then move inland across eastern North Carolina early Tuesday morning, move along the coast of the mid-Atlantic states on Tuesday, and continue across the northeastern United States Tuesday night. Data from NOAA Doppler weather radars and the Hurricane Hunter aircraft indicate that maximum sustained winds have increased to ear 75 mph (120 km/h) with higher gusts. Some additional strengthening is possible before landfall. After landfall, only gradual weakening is anticipated after Isaias makes landfall in the Carolinas and moves across the U.S. mid-Atlantic region tonight and Tuesday. Hurricane-force winds extend outward up to 25 miles (40 km) from the center, while tropical-storm-force winds extend outward up to 125 miles (205 km) from the center. NOAA buoy 41004 recently reported sustained winds of 60 mph (96 km/h), and a Weatherflow station at Winyah Bay, South Carolina recently reported sustained winds of 61 mph (98 km/h) and a wind gust of 69 mph (111 km/h). The minimum central pressure based on aircraft and buoy data is 988 mb (29.18 inches). NOAA buoy 41004 recently reported a minimum pressure of 988.9 mb (29.20 inches). HAZARDS AFFECTING LAND ---------------------- Key messages for Isaias can be found in the Tropical Cyclone Discussion under AWIPS header MIATCDAT4, WMO header WTNT44 KNHC, and on the web at www.hurricanes.gov/text/MIATCDAT4.shtml. STORM SURGE: The combination of a dangerous storm surge and the tide will cause normally dry areas near the coast to be flooded by rising waters moving inland from the shoreline. The water could reach the following heights above ground somewhere in the indicated areas if the peak surge occurs at the time of high tide... South Santee River SC to Cape Fear NC...3-5 ft Folly Beach SC to South Santee River SC...2-4 ft Cape Fear NC to the North Carolina/Virginia border including Pamlico Sound, Albemarle Sound, Neuse and Pamlico Rivers...2-4 ft Savannah River to Folly Beach SC...1-3 ft North of the North Carolina/Virginia border to Martha's Vineyard including the Chesapeake Bay, the Tidal Potomac River, Delaware Bay, Long Island Sound, Block Island Sound, Narragansett Bay, Buzzards Bay, and Vineyard Sound...1-3 ft The deepest water will occur along the immediate coast in areas of onshore winds, where the surge will be accompanied by large waves. Surge-related flooding depends on the relative timing of the surge and the tidal cycle, and can vary greatly over short distances. For information specific to your area, please see products issued by your local National Weather Service forecast office. WIND: Hurricane conditions are expected within the hurricane warning area in South and North Carolina this evening and tonight, with tropical storm conditions spreading onshore in the next few hours. Widespread tropical-storm conditions are expected in the tropical storm warning area from coastal North Carolina to the mid-Atlantic states, including portions of the Chesapeake Bay region, tonight and Tuesday, with wind gusts to hurricane force possible. These winds could cause tree damage and power outages. Tropical storm conditions are expected to reach southern New England Tuesday afternoon and northern New England Tuesday night and early Wednesday. RAINFALL: The following rainfall accumulations are expected along and near the track of Isaias: Carolinas and the Mid-Atlantic: 3 to 6 inches, isolated maximum totals 8 inches. Eastern New York and western New England from Connecticut to New Hampshire: 2 to 4 inches, isolated maximum totals 6 inches. Western and northern Maine: 1 to 3 inches. Heavy rainfall along the East Coast, near the path of Isaias, will result in flash and urban flooding, some of which may be significant in the eastern Carolinas, Mid-Atlantic and Northeast through Wednesday. Widespread minor to moderate river flooding is possible across portions of the Carolinas and the Mid-Atlantic. Quick-responding rivers in Northeast will also be susceptible to minor river flooding. TORNADOES: A few tornadoes will be possible near northeastern South Carolina coastal areas by early this evening, before spreading across eastern North Carolina tonight into Tuesday morning. A couple of tornadoes will be possible on Tuesday from eastern Virginia northeastward into southern New England. SURF: Swells generated by Isaias are affecting portions of the Bahamas and the southeast coast of the United States and will spread northward along the U.S. east coast during the next couple of days. These swells are likely to cause life-threatening surf and rip current conditions. Please consult products from your local weather office. NEXT ADVISORY ------------- Next complete advisory at 1100 PM EDT. $$ Forecaster Beven
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Tropical Storm Isaias Forecast Discussion Number 27
2020-08-03 22:59:24| National Hurricane Center (Atlantic)
Issued at 500 PM EDT Mon Aug 03 2020 000 WTNT44 KNHC 032059 TCDAT4 Tropical Storm Isaias Discussion Number 27 NWS National Hurricane Center Miami FL AL092020 500 PM EDT Mon Aug 03 2020 Isaias is undergoing its daily reorganization phase, with a ragged eye-like feature now showing up in NOAA Doppler weather radars from Charleston, Wilmington, and Jacksonville. The last Air Force Reserve reconnaissance flight reported a peak SFMR-derived surface wind speed of 62 kt in the southwest quadrant around 1630Z while Isaias was experiencing a center reformation further to the east. Since then, Doppler velocities of 70-75 kt have been observed between 10,000-15,000 ft in the northern semicircle, but within reflectivity regions less than 35 dBZ, which suggests that a the reduction factor is likely less than the 90-percent value typically used. Thus the intensity is being held at 60 kt, which means that Isaias is very near hurricane status. Another Air Force Reserve reconnaissance will be investigating the cyclone around 0000Z this evening. Isaias is now moving north-northeastward 015/14 kt. The new NHC model guidance remains in excellent agreement on Isaias continuing to gradually accelerate north-northeastward to northeastward for the next 36 hours ahead of a powerful deep-layer trough and associated cold front. The cyclone should make landfall later this evening near the South Carolina-North Carolina border, and then accelerate north-northeastward at 25-30 kt across eastern North Carolina early Tuesday, eastern Virginia and the Delmarva peninsula Tuesday afternoon, and into New England Tuesday night into early Wednesday. The new NHC track forecast is just an update and extension of the previous advisory track, and lies very close to a blend of the tightly packed multi-model consensus aids TVCA, GFEX, TVCX, and NOAA-HCCA. Satellite animation and special 1800Z upper-air soundings indicate that the vertical shear across Isaias has weakened and has also become more southwesterly, which better aligns with the forecast track. Given this and the improved structure of the system, Isaias is still expected to strengthen and regain hurricane status before making landfall, and most of the intensity guidance shows a 60-65 kt system at that time. It should be emphasized that there is little difference between a strong tropical storm or a category 1 hurricane in terms of impacts. After landfall, Isaias is forecast to only slowly weaken due to interaction with an unusually strong 100-120 kt jetstream. The expected strong baroclinic forcing will keep Isaias' circulation intact and also produce very strong wind gusts along the mid-Atlantic coast tomorrow. As a result, the gust factors at 24-48 h have been increased above the standard 20 percent in the Forecast/Advisory (TCMAT4). The cyclone is forecast to be absorbed by a larger extratropical low over Canada in 3-4 days. Key Messages: 1. There is the danger of life-threatening storm surge inundation along portions of the immediate coastline and adjacent waterways of northeastern South Carolina and the North Carolina coast, including portions of Pamlico and Albemarle Sounds. Residents in these areas should follow advice given by local emergency officials. 2. Isaias is expected to be at or near hurricane strength when it reaches the coast of northeastern South Carolina and southern North Carolina in a few hours, and hurricane conditions are expected in the Hurricane Warning area this evening. 3. Isaias is expected to bring widespread sustained tropical storm force winds and wind gusts to hurricane force to the mid-Atlantic coast, including portions of the Chesapeake Bay region, on Tuesday, which could cause tree damage and power outages. Tropical storm conditions are expected to spread across New England late Tuesday into early Wednesday. 4. Heavy rainfall along the East Coast near the path of Isaias will result in flash and urban flooding, some of which may be significant in the eastern Carolinas, mid-Atlantic and northeast through Wednesday. Widespread minor to moderate river flooding is possible across portions of the Carolinas and the Mid-Atlantic. Quick- responding rivers in the northeast will also be susceptible to minor river flooding. FORECAST POSITIONS AND MAX WINDS INIT 03/2100Z 32.0N 79.4W 60 KT 70 MPH 12H 04/0600Z 34.7N 78.1W 60 KT 70 MPH...INLAND 24H 04/1800Z 39.3N 75.3W 55 KT 65 MPH...INLAND 36H 05/0600Z 44.5N 71.8W 45 KT 50 MPH...INLAND 48H 05/1800Z 48.8N 68.6W 30 KT 35 MPH...POST-TROP/EXTRATROP 60H 06/0600Z 52.0N 67.1W 25 KT 30 MPH...POST-TROP/EXTRATROP 72H 06/1800Z 54.3N 63.4W 25 KT 30 MPH...POST-TROP/EXTRATROP 96H 07/1800Z...DISSIPATED $$ Forecaster Stewart
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Tropical Storm Isaias Public Advisory Number 27
2020-08-03 22:42:30| National Hurricane Center (Atlantic)
Issued at 500 PM EDT Mon Aug 03 2020 000 WTNT34 KNHC 032042 TCPAT4 BULLETIN Tropical Storm Isaias Advisory Number 27 NWS National Hurricane Center Miami FL AL092020 500 PM EDT Mon Aug 03 2020 ...ISAIAS GETTING BETTER ORGANIZED AND EXPECTED TO MAKE LANDFALL TONIGHT AS A HURRICANE WITH DANGEROUS WINDS AND STORM SURGE... ...STRONG WINDS AND HEAVY RAINFALL LIKELY FROM THE EASTERN CAROLINAS TO THE MID-ATLANTIC COAST TONIGHT AND TUESDAY... SUMMARY OF 500 PM EDT...2100 UTC...INFORMATION ---------------------------------------------- LOCATION...32.0N 79.4W ABOUT 60 MI...100 KM SSE OF CHARLESTON SOUTH CAROLINA ABOUT 120 MI...195 KM SSW OF MYRTLE BEACH SOUTH CAROLINA MAXIMUM SUSTAINED WINDS...70 MPH...110 KM/H PRESENT MOVEMENT...NNE OR 15 DEGREES AT 16 MPH...26 KM/H MINIMUM CENTRAL PRESSURE...993 MB...29.33 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: The Tropical Storm Warning has been extended northward to Stonington Maine. The Tropical Storm Warning south of Savannah River has been discontinued. SUMMARY OF WATCHES AND WARNINGS IN EFFECT: A Storm Surge Warning is in effect for... * Edisto Beach South Carolina to Cape Fear North Carolina * Pamlico and Albemarle Sounds, including the Neuse and Pamlico Rivers * Oregon Inlet North Carolina to the North Carolina/Virginia border A Storm Surge Watch is in effect for... * Cape Fear to Oregon Inlet North Carolina A Hurricane Warning is in effect for... * South Santee River South Carolina to Surf City North Carolina A Tropical Storm Warning is in effect for... * Savannah River to South Santee River South Carolina * North of Surf City North Carolina to Stonington Maine * Pamlico and Albemarle Sounds * Chesapeake Bay * Tidal Potomac River * Delaware Bay * Long Island and Long Island Sound * Martha's Vineyard, Nantucket, and Block Island A Tropical Storm Watch is in effect for... * North of Stonington to Eastport Maine A Storm Surge Warning means there is a danger of life-threatening inundation, from rising water moving inland from the coastline, in the indicated locations. For a depiction of areas at risk, please see the National Weather Service Storm Surge Watch/Warning Graphic at hurricanes.gov. This is a life-threatening situation. Persons located within these areas should take all necessary actions to protect life and property from rising water and the potential for other dangerous conditions. Promptly follow evacuation and other instructions from local officials. A Storm Surge Watch means there is a possibility of life- threatening inundation, from rising water moving inland from the coastline. A Hurricane Warning means that hurricane conditions are expected somewhere within the warning area. A Tropical Storm Warning means that tropical storm conditions are expected somewhere within the warning area, generally within 36 hours. A Tropical Storm Watch means that tropical storm conditions are possible within the watch area, generally within 48 hours. For storm information specific to your area, including possible inland watches and warnings, please monitor products issued by your local National Weather Service forecast office. DISCUSSION AND OUTLOOK ---------------------- At 500 PM EDT (2100 UTC), the center of Tropical Storm Isaias was located by NOAA Doppler weather radars near latitude 32.0 North, longitude 79.4 West. Isaias is moving toward the north-northeast near 16 mph (26 km/h), and this general motion accompanied by a gradual increase in forward speed is expected through tonight followed by a further increase in the forward speed on Tuesday. On the forecast track, the center of Isaias will approach the coasts of northeastern South Carolina and southern North Carolina within the hurricane warning area this evening. The center will then move inland across eastern North Carolina early Tuesday morning, move along the coast of the mid-Atlantic states on Tuesday, and continue across the northeastern United States Tuesday night. Data from NOAA Doppler weather radars indicate that maximum sustained winds are near 70 mph (110 km/h) with higher gusts. Some strengthening is forecast later this afternoon or early evening, and Isaias is expected to make landfall tonight at or near hurricane strength along the coast of northeastern South Carolina or southern North Carolina. Only gradual weakening is anticipated after Isaias makes landfall in the Carolinas and moves across the U.S. mid-Atlantic region tonight and Tuesday. Tropical-storm-force winds extend outward up to 125 miles (205 km) from the center. During the past couple of hours, a sustained wind of 45 mph (72 km/h) and a gust to 52 mph (83 km/h) were measured by a Weatherflow site at Folly Beach Pier, South Carolina. The estimated minimum central pressure is 993 mb (29.33 inches). HAZARDS AFFECTING LAND ---------------------- Key messages for Isaias can be found in the Tropical Cyclone Discussion under AWIPS header MIATCDAT4, WMO header WTNT44 KNHC, and on the web at www.hurricanes.gov/text/MIATCDAT4.shtml. STORM SURGE: The combination of a dangerous storm surge and the tide will cause normally dry areas near the coast to be flooded by rising waters moving inland from the shoreline. The water could reach the following heights above ground somewhere in the indicated areas if the peak surge occurs at the time of high tide... South Santee River SC to Cape Fear NC...3-5 ft Edisto Beach SC to South Santee River SC...2-4 ft Cape Fear NC to the North Carolina/Virginia border including Pamlico Sound, Albemarle Sound, Neuse and Pamlico Rivers...2-4 ft Savannah River to Edisto Beach SC...1-3 ft North of the North Carolina/Virginia border to Martha's Vineyard including the Chesapeake Bay, the Tidal Potomac River, Delaware Bay, Long Island Sound, Block Island Sound, Narragansett Bay, Buzzards Bay, and Vineyard Sound...1-3 ft The deepest water will occur along the immediate coast in areas of onshore winds, where the surge will be accompanied by large waves. Surge-related flooding depends on the relative timing of the surge and the tidal cycle, and can vary greatly over short distances. For information specific to your area, please see products issued by your local National Weather Service forecast office. WIND: Hurricane conditions are expected within the hurricane warning area in South and North Carolina this evening and tonight, with tropical storm conditions spreading onshore in the next few hours. Widespread tropical-storm-conditions are expected in the tropical storm warning area from coastal North Carolina to the mid-Atlantic states, including portions of the Chesapeake Bay region, tonight and Tuesday, with wind gusts to hurricane force possible. These winds could cause tree damage and power outages. Tropical storm conditions are expected to reach southern New England Tuesday afternoon and northern New England Tuesday night and early Wednesday. RAINFALL: The following rainfall accumulations are expected along and near the track of Isaias: Carolinas and the Mid-Atlantic: 3 to 6 inches, isolated maximum totals 8 inches. Eastern New York and western New England from Connecticut to New Hampshire: 2 to 4 inches, isolated maximum totals 6 inches. Western and northern Maine: 1 to 3 inches. Heavy rainfall along the East Coast, near the path of Isaias, will result in flash and urban flooding, some of which may be significant in the eastern Carolinas, Mid-Atlantic and Northeast through Wednesday. Widespread minor to moderate river flooding is possible across portions of the Carolinas and the Mid-Atlantic. Quick-responding rivers in Northeast will also be susceptible to minor river flooding. TORNADOES: A few tornadoes will be possible near northeastern South Carolina coastal areas by early this evening, before spreading across eastern North Carolina tonight into Tuesday morning. A couple of tornadoes will be possible on Tuesday from eastern Virginia northeastward into southern New England. SURF: Swells generated by Isaias are affecting portions of the Bahamas and the southeast coast of the United States and will spread northward along the U.S. east coast during the next couple of days. These swells are likely to cause life-threatening surf and rip current conditions. Please consult products from your local weather office. NEXT ADVISORY ------------- Next intermediate advisory at 800 PM EDT. Next complete advisory at 1100 PM EDT. $$ Forecaster Stewart
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