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Tropical Storm Ida Public Advisory Number 4
2021-08-27 10:56:41| National Hurricane Center (Atlantic)
Issued at 500 AM EDT Fri Aug 27 2021 000 WTNT34 KNHC 270856 TCPAT4 BULLETIN Tropical Storm Ida Advisory Number 4 NWS National Hurricane Center Miami FL AL092021 500 AM EDT Fri Aug 27 2021 ...IDA STRENGTHENS AS THE CENTER PASSES THROUGH THE CAYMAN ISLANDS... ...AIR FORCE RESERVE AND NOAA HURRICANE HUNTER AIRCRAFT ENROUTE TO INVESTIGATE THE STORM... SUMMARY OF 500 AM EDT...0900 UTC...INFORMATION ---------------------------------------------- LOCATION...20.0N 81.4W ABOUT 50 MI...80 KM NNW OF GRAND CAYMAN ABOUT 145 MI...230 KM SE OF THE ISLE OF YOUTH MAXIMUM SUSTAINED WINDS...45 MPH...75 KM/H PRESENT MOVEMENT...NW OR 320 DEGREES AT 15 MPH...24 KM/H MINIMUM CENTRAL PRESSURE...1001 MB...29.56 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: None. SUMMARY OF WATCHES AND WARNINGS IN EFFECT: A Storm Surge Watch is in effect for... * Sabine Pass to Alabama/Florida border * Vermilion Bay, Lake Borgne, Lake Pontchartrain, Lake Maurepas, and Mobile Bay A Hurricane Watch is in effect for... * Cameron, Louisiana to the Mississippi/Alabama border * Lake Pontchartrain, Lake Maurepas, and Metropolitan New Orleans A Tropical Storm Warning is in effect for... * Cayman Islands * Cuban provinces of Matanzas, Mayabeque, Havana, Artemisa, Pinar del Rio, and the Isle of Youth A Tropical Storm Watch is in effect for... * Mississippi/Alabama border to the Alabama/Florida border. A Storm Surge Watch means there is a possibility of life- threatening inundation, from rising water moving inland from the coastline, in the indicated locations during the next 48 hours. For a depiction of areas at risk, please see the National Weather Service Storm Surge Watch/Warning Graphic, available at hurricanes.gov. A Hurricane Watch means that hurricane conditions are possible within the watch area. A watch is typically issued 48 hours before the anticipated first occurrence of tropical-storm-force winds, conditions that make outside preparations difficult or dangerous. A Tropical Storm Warning means that tropical storm conditions are expected somewhere within the warning area within 36 hours. A Tropical Storm Watch means that tropical storm conditions are possible within the watch area, generally within 48 hours. Interests elsewhere in central and western Cuba, in the northern Yucatan Peninsula, and elsewhere along the northern U.S. Gulf coast should monitor the progress of this system. Hurricane warnings will likely be required for portions of the northern Gulf coast later today. Interests in the Dry Tortugas should also monitor the progress of Ida. For storm information specific to your area in the United States, including possible inland watches and warnings, please monitor products issued by your local National Weather Service forecast office. For storm information specific to your area outside of the United States, please monitor products issued by your national meteorological service. DISCUSSION AND OUTLOOK ---------------------- At 500 AM EDT (0900 UTC), the center of Tropical Storm Ida was located by weather radar on Grand Cayman near latitude 20.0 North, longitude 81.4 West. Ida is moving toward the northwest near 15 mph (24 km/h) and this general motion should continue over the next few days. On the forecast track, the center of Ida will move away from the Cayman Islands this morning, pass near or over the Isle of Youth and western Cuba later today, and over the southeastern and central Gulf of Mexico tonight and Saturday. The system is forecast to approach the U.S. northern Gulf coast on Sunday. Maximum sustained winds have increased to near 45 mph (75 km/h) with higher gusts, and additional steady to rapid strengthening is expected during the next few days. Ida is forecast to become a hurricane over the southeastern Gulf of Mexico in a day or two, and to be at or near major hurricane strength when it approaches the northern Gulf coast. Tropical-storm-force winds extend outward up to 80 miles (130 km) from the center. The estimated minimum central pressure is 1001 mb (29.56 inches). Grand Cayman Island recently reported a pressure of 1003 mb (29.62 inches). HAZARDS AFFECTING LAND ---------------------- Key messages for Tropical Storm Ida can be found in the Tropical Cyclone Discussion under AWIPS header MIATCDAT4, WMO header WTNT44 KNHC, and on the web at hurricanes.gov/graphics_at4.shtml?key_messages. STORM SURGE: A dangerous storm surge will raise water levels by as much as 2 to 4 feet above normal tide levels in areas of onshore winds along the immediate coast of the Isle of Youth and near and to the east of where the center crosses the coast of western Cuba. Near the coast, the surge will be accompanied by large and destructive waves. 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... Morgan City, LA to Ocean Springs, MS including Lake Borgne...7-11 ft Rockefeller Wildlife Refuge, LA to Morgan City, LA including Vermilion Bay...4-7 ft Ocean Springs, MS to MS/AL border...4-7 ft MS/AL border to AL/FL border including Mobile Bay...3-5 ft Lake Pontchartrain...3-5 ft Lake Maurepas...2-4 ft Sabine Pass to Rockefeller Wildlife Refuge, LA...2-4 ft The deepest water will occur along the immediate coast near and to the east of the landfall location, where the surge will be accompanied by large and dangerous 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: Tropical storm conditions are expected in the Cayman Islands this morning, and are expected to reach the Isle of Youth and portions of western Cuba in the warning area later today. Hurricane conditions are possible in the hurricane watch area along the northern Gulf coast late Saturday night or Sunday and tropical storm conditions are possible in the watch area late Saturday night or Sunday. RAINFALL: Ida is expected to produce total rainfall accumulations of 6 to 10 inches with maximum totals of 15 inches across Jamaica. Rainfall totals of 8 to 12 inches with isolated maximum amounts of 20 inches are expected across the Cayman Islands and western Cuba, including the Isle of Youth. These rainfall amounts may produce life-threatening flash floods and mudslides. As Ida approaches the central Gulf Coast Sunday afternoon, total rainfall accumulations of 8 to 16 inches with isolated maximum amounts of 20 inches are possible from southeast Louisiana to coastal Mississippi and Alabama through Monday morning. Ida is forecast to turn northeast as it moves inland later Monday with rainfall totals of 4 to 8 inches possible across southern and central Mississippi. This is likely to result in considerable flash, urban, small stream, and riverine flooding. SURF: Swells generated by this system will affect Jamaica, the Cayman Islands and Cuba tonight and Friday. Swells will begin reaching portions of the northern Gulf coast Saturday night or early Sunday. 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 AM EDT. Next complete advisory at 1100 AM EDT. $$ Forecaster Beven
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Tropical Storm Ida Forecast Advisory Number 4
2021-08-27 10:56:41| National Hurricane Center (Atlantic)
Issued at 0900 UTC FRI AUG 27 2021 000 WTNT24 KNHC 270856 TCMAT4 TROPICAL STORM IDA FORECAST/ADVISORY NUMBER 4 NWS NATIONAL HURRICANE CENTER MIAMI FL AL092021 0900 UTC FRI AUG 27 2021 CHANGES IN WATCHES AND WARNINGS WITH THIS ADVISORY... NONE. SUMMARY OF WATCHES AND WARNINGS IN EFFECT... A STORM SURGE WATCH IS IN EFFECT FOR... * SABINE PASS TO ALABAMA/FLORIDA BORDER * VERMILION BAY...LAKE BORGNE...LAKE PONTCHARTRAIN...LAKE MAUREPAS...AND MOBILE BAY A HURRICANE WATCH IS IN EFFECT FOR... * CAMERON...LOUISIANA TO THE MISSISSIPPI/ALABAMA BORDER * LAKE PONTCHARTRAIN...LAKE MAUREPAS...AND METROPOLITAN NEW ORLEANS A TROPICAL STORM WARNING IS IN EFFECT FOR... * CAYMAN ISLANDS * CUBAN PROVINCES OF MATANZAS...MAYABEQUE...HAVANA...ARTEMISA... PINAR DEL RIO...AND THE ISLE OF YOUTH A TROPICAL STORM WATCH IS IN EFFECT FOR... * MISSISSIPPI/ALABAMA BORDER TO THE ALABAMA/FLORIDA BORDER. A STORM SURGE WATCH MEANS THERE IS A POSSIBILITY OF LIFE- THREATENING INUNDATION...FROM RISING WATER MOVING INLAND FROM THE COASTLINE...IN THE INDICATED LOCATIONS DURING THE NEXT 48 HOURS. FOR A DEPICTION OF AREAS AT RISK...PLEASE SEE THE NATIONAL WEATHER SERVICE STORM SURGE WATCH/WARNING GRAPHIC...AVAILABLE AT HURRICANES.GOV. A HURRICANE WATCH MEANS THAT HURRICANE CONDITIONS ARE POSSIBLE WITHIN THE WATCH AREA. A WATCH IS TYPICALLY ISSUED 48 HOURS BEFORE THE ANTICIPATED FIRST OCCURRENCE OF TROPICAL-STORM-FORCE WINDS...CONDITIONS THAT MAKE OUTSIDE PREPARATIONS DIFFICULT OR DANGEROUS. A TROPICAL STORM WARNING MEANS THAT TROPICAL STORM CONDITIONS ARE EXPECTED SOMEWHERE WITHIN THE WARNING AREA WITHIN 36 HOURS. A TROPICAL STORM WATCH MEANS THAT TROPICAL STORM CONDITIONS ARE POSSIBLE WITHIN THE WATCH AREA...GENERALLY WITHIN 48 HOURS. INTERESTS ELSEWHERE IN CENTRAL AND WESTERN CUBA...IN THE NORTHERN YUCATAN PENINSULA...AND ELSEWHERE ALONG THE NORTHERN U.S. GULF COAST SHOULD MONITOR THE PROGRESS OF THIS SYSTEM. HURRICANE WARNINGS WILL LIKELY BE REQUIRED FOR PORTIONS OF THE NORTHERN GULF COAST LATER TODAY. INTERESTS IN THE DRY TORTUGAS SHOULD ALSO MONITOR THE PROGRESS OF IDA. TROPICAL STORM CENTER LOCATED NEAR 20.0N 81.4W AT 27/0900Z POSITION ACCURATE WITHIN 20 NM PRESENT MOVEMENT TOWARD THE NORTHWEST OR 320 DEGREES AT 13 KT ESTIMATED MINIMUM CENTRAL PRESSURE 1001 MB MAX SUSTAINED WINDS 40 KT WITH GUSTS TO 50 KT. 34 KT....... 70NE 0SE 0SW 0NW. 12 FT SEAS.. 60NE 0SE 0SW 0NW. 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 20.0N 81.4W AT 27/0900Z AT 27/0600Z CENTER WAS LOCATED NEAR 19.5N 80.9W FORECAST VALID 27/1800Z 21.5N 82.9W...OVER ISLE OF YOUTH MAX WIND 50 KT...GUSTS 60 KT. 50 KT... 30NE 0SE 0SW 0NW. 34 KT... 80NE 40SE 30SW 50NW. FORECAST VALID 28/0600Z 23.4N 84.9W MAX WIND 60 KT...GUSTS 75 KT. 50 KT... 40NE 0SE 0SW 20NW. 34 KT... 90NE 70SE 40SW 60NW. FORECAST VALID 28/1800Z 25.3N 86.9W MAX WIND 70 KT...GUSTS 85 KT. 64 KT... 20NE 0SE 0SW 0NW. 50 KT... 40NE 30SE 20SW 30NW. 34 KT...110NE 80SE 40SW 80NW. FORECAST VALID 29/0600Z 27.1N 88.8W MAX WIND 85 KT...GUSTS 105 KT. 64 KT... 30NE 20SE 20SW 20NW. 50 KT... 50NE 40SE 40SW 40NW. 34 KT...130NE 110SE 60SW 100NW. FORECAST VALID 29/1800Z 28.7N 90.2W MAX WIND 100 KT...GUSTS 120 KT. 50 KT... 60NE 60SE 40SW 50NW. 34 KT...130NE 110SE 70SW 100NW. FORECAST VALID 30/0600Z 30.1N 91.1W...INLAND MAX WIND 85 KT...GUSTS 105 KT. 50 KT... 50NE 60SE 30SW 40NW. 34 KT...120NE 110SE 70SW 70NW. EXTENDED OUTLOOK. NOTE...ERRORS FOR TRACK HAVE AVERAGED NEAR 150 NM ON DAY 4 AND 175 NM ON DAY 5...AND FOR INTENSITY NEAR 15 KT EACH DAY OUTLOOK VALID 31/0600Z 33.0N 90.5W...INLAND MAX WIND 35 KT...GUSTS 45 KT. OUTLOOK VALID 01/0600Z 35.0N 88.0W...INLAND MAX WIND 25 KT...GUSTS 35 KT. REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 20.0N 81.4W INTERMEDIATE PUBLIC ADVISORY...WTNT34 KNHC/MIATCPAT4...AT 27/1200Z NEXT ADVISORY AT 27/1500Z $$ FORECASTER BEVEN
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Tropical Storm Nora Public Advisory Number 6A
2021-08-27 07:51:40| National Hurricane Center (East Pacific)
Issued at 100 AM CDT Fri Aug 27 2021 000 WTPZ34 KNHC 270551 TCPEP4 BULLETIN Tropical Storm Nora Intermediate Advisory Number 6A NWS National Hurricane Center Miami FL EP142021 100 AM CDT Fri Aug 27 2021 ...NORA A LITTLE STRONGER... SUMMARY OF 100 AM CDT...0600 UTC...INFORMATION ---------------------------------------------- LOCATION...14.2N 103.0W ABOUT 260 MI...420 KM S OF LAZARO CARDENAS MEXICO ABOUT 350 MI...565 KM SSE OF MANZANILLO MEXICO MAXIMUM SUSTAINED WINDS...50 MPH...80 KM/H PRESENT MOVEMENT...WNW OR 290 DEGREES AT 12 MPH...19 KM/H MINIMUM CENTRAL PRESSURE...999 MB...29.50 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: None. SUMMARY OF WATCHES AND WARNINGS IN EFFECT: A Hurricane Watch is in effect for... * Lazaro Cardenas to Cabo Corrientes Mexico A Tropical Storm Warning is in effect for... * Tecpan de Galeana to Cabo Corrientes Mexico A Tropical Storm Watch is in effect for... * North of Cabo Corrientes to San Blas Mexico A Hurricane Watch means that hurricane conditions are possible within the watch area. A watch is typically issued 48 hours before the anticipated first occurrence of tropical-storm-force winds, conditions that make outside preparations difficult or dangerous. A Tropical Storm Warning means that tropical storm conditions are expected somewhere within the warning area within 36 hours. A Tropical Storm Watch means that tropical storm conditions are possible within the watch area, generally within 48 hours. Interests elsewhere along the west-central coast of Mexico and southern portions of Baja California Sur should monitor the progress of Nora. Additional watches and warnings will likely be required for portions of these areas on Friday. For storm information specific to your area, please monitor products issued by your national meteorological service. DISCUSSION AND OUTLOOK ---------------------- At 100 AM CDT (0600 UTC), the center of Tropical Storm Nora was located near latitude 14.2 North, longitude 103.0 West. Nora is moving toward the west-northwest near 12 mph (19 km/h). A turn toward the northwest is expected later today, followed by a northwestward or north-northwestward motion on Saturday and Sunday. On the forecast track, the center of Nora will approach the southwestern coast of Mexico Friday and Friday night and pass very near the coast Saturday and Saturday night. Nora will then approach the southern portion of Baja California Sur on Sunday. Recent satellite wind data indicate that Nora's maximum sustained winds have increased to near 50 mph (80 km/h) with higher gusts. Strengthening is forecast during the next few days, and Nora is expected to become a hurricane on Saturday. Nora is a large tropical storm. Tropical-storm-force winds extend outward up to 205 miles (335 km) from the center. The estimated minimum central pressure is 999 mb (29.50 inches). HAZARDS AFFECTING LAND ---------------------- Key messages for Nora can be found in the Tropical Cyclone Discussion under AWIPS header MIATCDEP4, WMO header WTPZ44 KNHC, and on the web at hurricanes.gov/graphics_ep4.shtml?key_messages. WIND: Hurricane conditions are possible within the hurricane watch area Saturday, with tropical storm conditions beginning today. Tropical storm conditions are expected within the tropical storm warning area beginning this morning. Tropical storm conditions are possible within the tropical storm watch area beginning on Saturday. RAINFALL: Tropical Storm Nora is expected to produce heavy rains over coastal sections of the Mexican states of Oaxaca, Guerrero, Michoacan, Colima, and Jalisco. Rainfall totals of 8 to 12 inches are forecast through this weekend with isolated maximum amounts of 20 inches possible. Life-threatening flash flooding and mudslides may occur. SURF: Swells generated by Nora are affecting the southern coast of Mexico and will spread northward to the southwestern coast of Mexico on Friday and into the weekend. 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 400 AM CDT. $$ Forecaster Papin/Beven
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Tropical Storm Ida Public Advisory Number 3A
2021-08-27 07:50:10| National Hurricane Center (Atlantic)
Issued at 200 AM EDT Fri Aug 27 2021 000 WTNT34 KNHC 270550 TCPAT4 BULLETIN Tropical Storm Ida Intermediate Advisory Number 3A NWS National Hurricane Center Miami FL AL092021 200 AM EDT Fri Aug 27 2021 ...CENTER OF IDA PASSING THROUGH THE CAYMAN ISLANDS... SUMMARY OF 200 AM EDT...0600 UTC...INFORMATION ---------------------------------------------- LOCATION...19.4N 80.9W ABOUT 30 MI...50 KM ENE OF GRAND CAYMAN ABOUT 310 MI...500 KM ESE OF THE WESTERN TIP OF CUBA MAXIMUM SUSTAINED WINDS...40 MPH...65 KM/H PRESENT MOVEMENT...NW OR 320 DEGREES AT 12 MPH...19 KM/H MINIMUM CENTRAL PRESSURE...1006 MB...29.71 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: None. SUMMARY OF WATCHES AND WARNINGS IN EFFECT: A Storm Surge Watch is in effect for... * Sabine Pass to Alabama/Florida border * Vermilion Bay, Lake Borgne, Lake Pontchartrain, Lake Maurepas, and Mobile Bay A Hurricane Watch is in effect for... * Cameron, Louisiana to the Mississippi/Alabama border * Lake Pontchartrain, Lake Maurepas, and Metropolitan New Orleans A Tropical Storm Warning is in effect for... * Cayman Islands * Cuban provinces of Matanzas, Mayabeque, Havana, Artemisa, Pinar del Rio, and the Isle of Youth A Tropical Storm Watch is in effect for... * Mississippi/Alabama border to the Alabama/Florida border. A Storm Surge Watch means there is a possibility of life- threatening inundation, from rising water moving inland from the coastline, in the indicated locations during the next 48 hours. For a depiction of areas at risk, please see the National Weather Service Storm Surge Watch/Warning Graphic, available at hurricanes.gov. A Hurricane Watch means that hurricane conditions are possible within the watch area. A watch is typically issued 48 hours before the anticipated first occurrence of tropical-storm-force winds, conditions that make outside preparations difficult or dangerous. A Tropical Storm Warning means that tropical storm conditions are expected somewhere within the warning area within 36 hours. A Tropical Storm Watch means that tropical storm conditions are possible within the watch area, generally within 48 hours. Interests elsewhere in central and western Cuba, in the northern Yucatan Peninsula, and elsewhere along the northern U.S. Gulf coast should monitor the progress of this system. For storm information specific to your area in the United States, including possible inland watches and warnings, please monitor products issued by your local National Weather Service forecast office. For storm information specific to your area outside of the United States, please monitor products issued by your national meteorological service. DISCUSSION AND OUTLOOK ---------------------- At 200 AM EDT (0600 UTC), the center of Tropical Storm Ida was located by the weather radar on Grand Cayman near latitude 19.4 North, longitude 80.9 West. Ida is moving toward the northwest near 12 mph (19 km/h) and this general motion should continue over the next few days. On the forecast track, the center of Ida will pass through the Cayman Islands during the next few hours, pass near or over the Isle of Youth and western Cuba later today, and over the southeastern and central Gulf of Mexico tonight and Saturday. The system is forecast to approach the U.S. northern Gulf coast on Sunday. Maximum sustained winds are near 40 mph (65 km/h) with higher gusts. Ida is forecast to become a hurricane over the southeastern Gulf of Mexico in a day or two with additional strengthening expected thereafter. Ida could be near major hurricane strength when it approaches the northern Gulf coast. Tropical-storm-force winds extend outward up to 70 miles (110 km) from the center. An unofficial weather station on Grand Cayman recently reported a wind gust of 46 mph (74 km/h). The estimated minimum central pressure is 1006 mb (29.71 inches). A weather station on Grand Cayman recently reported a pressure of 1007 mb (29.74 inches). HAZARDS AFFECTING LAND ---------------------- Key messages for Tropical Storm Ida can be found in the Tropical Cyclone Discussion under AWIPS header MIATCDAT4, WMO header WTNT44 KNHC, and on the web at hurricanes.gov/graphics_at4.shtml?key_messages. STORM SURGE: A dangerous storm surge will raise water levels by as much as 2 to 4 feet above normal tide levels in areas of onshore winds along the immediate coast of the Isle of Youth and near and to the east of where the center crosses the coast of western Cuba. Near the coast, the surge will be accompanied by large and destructive waves. 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... Morgan City, LA to Ocean Springs, MS including Lake Borgne...7-11 ft Rockefeller Wildlife Refuge, LA to Morgan City, LA including Vermilion Bay...4-7 ft Ocean Springs, MS to MS/AL border...4-7 ft MS/AL border to AL/FL border including Mobile Bay...3-5 ft Lake Pontchartrain...3-5 ft Lake Maurepas...2-4 ft Sabine Pass to Rockefeller Wildlife Refuge, LA...2-4 ft The deepest water will occur along the immediate coast near and to the east of the landfall location, where the surge will be accompanied by large and dangerous 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: Tropical storm conditions are expected in the Cayman Islands this morning, and are expected to reach the Isle of Youth and portions of western Cuba in the warning area later today. Hurricane conditions are possible in the hurricane watch area along the northern Gulf coast late Saturday night or Sunday and tropical storm conditions are possible in the watch area late Saturday night or Sunday. RAINFALL: Tropical Storm Ida is expected to produce total rainfall accumulations of 6 to 10 inches with maximum totals of 15 inches across Jamaica. Rainfall totals of 8 to 12 inches with isolated maximum amounts of 20 inches are expected across the Cayman Islands and western Cuba, including the Isle of Youth. These rainfall amounts may produce life-threatening flash floods and mudslides. Tropical Storm Ida is likely to bring rainfall amounts of 8 to 12 inches with isolated maximum amounts up to 15 inches along the central Gulf Coast Sunday into Monday. This is likely to result in flash, urban, small stream, and riverine flooding to the central Gulf Coast. SURF: Swells generated by this system will affect Jamaica, the Cayman Islands and Cuba tonight and Friday. Swells will begin reaching portions of the northern Gulf coast Saturday night or early Sunday. 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 500 AM EDT. $$ Forecaster Beven
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Tropical Storm Ida Forecast Discussion Number 3
2021-08-27 05:23:39| National Hurricane Center (Atlantic)
Issued at 1100 PM EDT Thu Aug 26 2021 000 WTNT44 KNHC 270322 CCA TCDAT4 Tropical Storm Ida Discussion Number 3...Corrected NWS National Hurricane Center Miami FL AL092021 1100 PM EDT Thu Aug 26 2021 Corrected Key Message Number 4 The Air Force Hurricane Hunters have been investigating Ida this evening and found maximum flight-level winds of 47 kt at 2500 ft. This data along with numerous unflagged 35-kt SFMR winds supported raising the intensity to 35 kt earlier this evening. Since the aircraft departed Ida, there has been little change in the storm's structure, so the initial intensity was held at 35 kt. Ida is an asymmetric tropical storm with most of the deep convection and stronger winds confined to the eastern half of the circulation. Both the NOAA and Air Force Hurricane Hunters will be investigating Ida Friday morning. The storm has been wobbling around, but smoothing through the recent erratic motion yields an initial motion estimate of 320/10 kt. A mid-level ridge centered off the southeast U.S. coast is expected to shift westward on Friday and over the weekend. This feature should keep Ida moving on a general northwestward track for the next 2 or 3 days, taking the core of the system over western Cuba Friday afternoon or evening and then across the southern and central Gulf of Mexico this weekend. Although some model timing differences remain, they are in fairly good agreement that Ida will make landfall in Louisiana late Sunday or early Monday. The GFS and ECMWF ensemble members basically span a similar region and are most concentrated across the state of Louisiana. Users are reminded to not focus on the exact forecast track as impacts will extend far from the center and the average 72-hour track error is around 120 miles. There is some southwesterly vertical wind shear affecting Ida at the moment, which is the likely part of the reason the cloud pattern and wind field are asymmetric. However, the global model show the upper-level pattern becoming quite favorable late Friday and through the weekend. These more conducive winds aloft combined with very warm SSTs and abundant moisture is likely to result in steady or rapid intensification until Ida makes landfall in the U.S. The intensity guidance unanimously show Ida becoming a hurricane, but there is notable spread in how strong the system will become. Given the expected favorable environmental conditions for the storm, the NHC intensity forecast lies near the high end of the model guidance, in best agreement with the regional hurricane models. It is also worth noting that even though the global models are not particularly accurate in predicting tropical cyclone winds, the GFS and ECMWF show the minimum pressure falling more than 35 mb from the current conditions. Based on all of this information, there is higher-than-normal confidence that a significant hurricane will be approaching the Gulf coast late this weekend. Key Messages: 1. Tropical storm conditions are expected in portions of the Cayman Islands tonight and in portions of western Cuba and the Isle of Youth Friday, where a dangerous storm surge is also possible in areas of onshore flow. Life-threatening heavy rains, flash flooding and mudslides are expected across Jamaica, the Cayman Islands, and western Cuba, including the Isle of Youth. 2. There is an increasing risk of life-threatening storm surge inundation along the coasts of Louisiana, Mississippi, and Alabama, where a Storm Surge Watch is in effect. Interests in these areas should follow any advice given by local officials. 3. There is an increasing risk of dangerous hurricane-force winds beginning Sunday along the portions of the coasts of Louisiana and Mississippi, including metropolitan New Orleans, where a Hurricane Watch is in effect. 4. Ida is likely to produce heavy rainfall Sunday into Monday along the central Gulf coast resulting in flash, urban, small stream, and riverine flooding. FORECAST POSITIONS AND MAX WINDS INIT 27/0300Z 18.6N 80.5W 35 KT 40 MPH 12H 27/1200Z 19.9N 82.0W 45 KT 50 MPH 24H 28/0000Z 21.8N 83.9W 55 KT 65 MPH...NEAR CUBA 36H 28/1200Z 23.8N 85.9W 65 KT 75 MPH 48H 29/0000Z 25.6N 88.0W 75 KT 85 MPH 60H 29/1200Z 27.3N 89.6W 85 KT 100 MPH 72H 30/0000Z 29.0N 90.6W 95 KT 110 MPH...NEAR THE COAST 96H 31/0000Z 32.0N 91.0W 45 KT 50 MPH...INLAND 120H 01/0000Z 33.9N 88.8W 25 KT 30 MPH...INLAND $$ Forecaster Cangialosi
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