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Hurricane Isaias Forecast Advisory Number 16
2020-08-01 04:44:43| National Hurricane Center (Atlantic)
Issued at 0300 UTC SAT AUG 01 2020 000 WTNT24 KNHC 010244 TCMAT4 HURRICANE ISAIAS FORECAST/ADVISORY NUMBER 16 NWS NATIONAL HURRICANE CENTER MIAMI FL AL092020 0300 UTC SAT AUG 01 2020 CHANGES IN WATCHES AND WARNINGS WITH THIS ADVISORY... THE HURRICANE WATCH IS CHANGED TO A HURRICANE WARNING FROM THE VOLUSIA-BREVARD COUNTY LINE TO THE FLAGLER/VOLUSIA COUNTY LINE. SUMMARY OF WATCHES AND WARNINGS IN EFFECT: A HURRICANE WARNING IS IN EFFECT FOR... * BOCA RATON TO THE VOLUSIA/BREVARD COUNTY LINE FLORIDA * NORTHWESTERN BAHAMAS * CENTRAL BAHAMAS A HURRICANE WATCH IS IN EFFECT FOR... * HALLANDALE BEACH TO SOUTH OF BOCA RATON FLORIDA A STORM SURGE WATCH IS IN EFFECT FOR... * JUPITER INLET TO PONTE VEDRA BEACH FLORIDA A TROPICAL STORM WARNING IS IN EFFECT FOR... * NORTH OF OCEAN REEF TO SOUTH OF BOCA RATON FLORIDA * LAKE OKEECHOBEE A TROPICAL STORM WATCH IS IN EFFECT FOR... * FLAGLER/VOLUSIA COUNTY LINE TO PONTE VEDRA BEACH FLORIDA INTERESTS ELSEWHERE ALONG THE SOUTHEAST COAST OF THE UNITED STATES SHOULD MONITOR THE PROGRESS OF ISAIAS. ADDITIONAL WATCHES OR WARNINGS MAY BE REQUIRED ON SATURDAY. A HURRICANE WARNING MEANS THAT HURRICANE CONDITIONS ARE EXPECTED SOMEWHERE WITHIN THE WARNING AREA. A WARNING IS TYPICALLY ISSUED 36 HOURS BEFORE THE ANTICIPATED FIRST OCCURRENCE OF TROPICAL-STORM-FORCE WINDS...CONDITIONS THAT MAKE OUTSIDE PREPARATIONS DIFFICULT OR DANGEROUS. PREPARATIONS TO PROTECT LIFE AND PROPERTY SHOULD BE RUSHED TO COMPLETION. 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 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 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. HURRICANE CENTER LOCATED NEAR 23.3N 76.4W AT 01/0300Z POSITION ACCURATE WITHIN 20 NM PRESENT MOVEMENT TOWARD THE NORTHWEST OR 310 DEGREES AT 13 KT ESTIMATED MINIMUM CENTRAL PRESSURE 987 MB MAX SUSTAINED WINDS 70 KT WITH GUSTS TO 85 KT. 64 KT....... 30NE 20SE 0SW 20NW. 50 KT....... 80NE 30SE 0SW 50NW. 34 KT.......150NE 70SE 30SW 130NW. 12 FT SEAS..300NE 150SE 90SW 300NW. 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 23.3N 76.4W AT 01/0300Z AT 01/0000Z CENTER WAS LOCATED NEAR 22.9N 75.9W FORECAST VALID 01/1200Z 24.5N 77.8W MAX WIND 75 KT...GUSTS 90 KT. 64 KT... 30NE 20SE 10SW 20NW. 50 KT... 70NE 40SE 20SW 50NW. 34 KT...140NE 90SE 40SW 120NW. FORECAST VALID 02/0000Z 25.9N 79.1W MAX WIND 75 KT...GUSTS 90 KT. 64 KT... 20NE 20SE 10SW 20NW. 50 KT... 60NE 40SE 20SW 40NW. 34 KT...120NE 90SE 40SW 100NW. FORECAST VALID 02/1200Z 27.1N 80.0W MAX WIND 70 KT...GUSTS 85 KT. 64 KT... 20NE 15SE 10SW 20NW. 50 KT... 50NE 30SE 20SW 40NW. 34 KT...120NE 90SE 40SW 80NW. FORECAST VALID 03/0000Z 28.5N 80.5W MAX WIND 65 KT...GUSTS 80 KT. 64 KT... 20NE 15SE 10SW 20NW. 50 KT... 50NE 30SE 20SW 40NW. 34 KT...110NE 90SE 40SW 70NW. FORECAST VALID 03/1200Z 30.2N 80.5W MAX WIND 60 KT...GUSTS 75 KT. 50 KT... 40NE 30SE 20SW 40NW. 34 KT...110NE 90SE 50SW 70NW. FORECAST VALID 04/0000Z 33.1N 78.9W MAX WIND 60 KT...GUSTS 75 KT. 50 KT... 40NE 30SE 20SW 30NW. 34 KT...110NE 90SE 50SW 60NW. 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 05/0000Z 41.0N 72.5W MAX WIND 55 KT...GUSTS 65 KT. OUTLOOK VALID 06/0000Z 47.5N 64.0W...POST-TROP/EXTRATROP MAX WIND 45 KT...GUSTS 55 KT. REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 23.3N 76.4W INTERMEDIATE PUBLIC ADVISORY...WTNT34 KNHC/MIATCPAT4...AT 01/0600Z NEXT ADVISORY AT 01/0900Z $$ FORECASTER PASCH
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Summary for Hurricane Isaias (AT4/AL092020)
2020-08-01 01:48:14| National Hurricane Center (Atlantic)
...TROPICAL STORM CONDITIONS AND HEAVY RAIN CONTINUE TO SPREAD ACROSS THE CENTRAL BAHAMAS... As of 8:00 PM EDT Fri Jul 31 the center of Isaias was located near 22.9, -75.9 with movement NW at 15 mph. The minimum central pressure was 987 mb with maximum sustained winds of about 80 mph.
Hurricane Isaias Public Advisory Number 15A
2020-08-01 01:48:14| National Hurricane Center (Atlantic)
Issued at 800 PM EDT Fri Jul 31 2020 000 WTNT34 KNHC 312348 TCPAT4 BULLETIN Hurricane Isaias Intermediate Advisory Number 15A NWS National Hurricane Center Miami FL AL092020 800 PM EDT Fri Jul 31 2020 ...TROPICAL STORM CONDITIONS AND HEAVY RAIN CONTINUE TO SPREAD ACROSS THE CENTRAL BAHAMAS... SUMMARY OF 800 PM EDT...0000 UTC...INFORMATION ---------------------------------------------- LOCATION...22.9N 75.9W ABOUT 175 MI...280 KM SSE OF NASSAU ABOUT 310 MI...500 KM SE OF FREEPORT GRAND BAHAMA ISLAND MAXIMUM SUSTAINED WINDS...80 MPH...130 KM/H PRESENT MOVEMENT...NW OR 310 DEGREES AT 15 MPH...24 KM/H MINIMUM CENTRAL PRESSURE...987 MB...29.15 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: The government of the Bahamas has discontinued the Hurricane Warning for the Southeastern Bahamas, and discontinued the Tropical Storm Warning for the Turks and Caicos Islands. SUMMARY OF WATCHES AND WARNINGS IN EFFECT: A Hurricane Warning is in effect for... * Boca Raton to the Volusia/Brevard County Line Florida * Northwestern Bahamas * Central Bahamas A Hurricane Watch is in effect for... * Hallendale Beach to south of Boca Raton Florida * Volusia-Brevard County Line to the Flagler/Volusia County Line A Storm Surge Watch is in effect for... * Jupiter Inlet to Ponte Vedra Beach Florida A Tropical Storm Warning is in effect for... * North of Ocean Reef to south of Boca Raton Florida * Lake Okeechobee A Tropical Storm Watch is in effect for... * Flagler/Volusia County Line to Ponte Vedra Beach Florida Interests elsewhere along the southeast coast of the United States should monitor the progress of Isaias. Additional watches or warnings may be required later tonight and Saturday. A Hurricane Warning means that hurricane conditions are expected somewhere within the warning area. A warning is typically issued 36 hours before the anticipated first occurrence of tropical-storm-force winds, conditions that make outside preparations difficult or dangerous. Preparations to protect life and property should be rushed to completion. 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 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 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. 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 800 PM EDT (0000 UTC), the center of Hurricane Isaias was located by Air Force and NOAA Hurricane Hunter aircraft near latitude 22.9 North, longitude 75.9 West. Isaias is moving toward the northwest near 15 mph (24 km/h), and a general northwestward motion with some decrease in forward speed is expected for the next day or so, followed by a turn toward the north-northwest by late Sunday. On the forecast track, the center of Isaias will move near or over the Central Bahamas tonight, near or over the Northwestern Bahamas Saturday and near the east coast of the Florida peninsula Saturday afternoon through Sunday. Maximum sustained winds are near 80 mph (130 km/h) with higher gusts. Additional strengthening is expected later tonight and early Saturday, and Isaias is forecast to remain a hurricane for the next couple of days. Hurricane-force winds extend outward up to 35 miles (55 km) from the center and tropical-storm-force winds extend outward up to 175 miles (280 km). Staniel Cay in the Exumas recently reported sustained winds of 40 mph (65 km/h) with a gust to 52 mph (83 km/h). The minimum central pressure estimated from Air Force Hurricane Hunter aircraft observations is 987 mb (29.15 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... Jupiter Inlet to Ponte Vedra Beach FL...2-4 ft North Miami Beach to Jupiter Inlet FL...1-3 ft The deepest water will occur along the immediate coast near and to the right of the center, 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. A dangerous storm surge will raise water levels by as much as 3 to 5 feet above normal tide levels in areas of onshore winds in the Bahamas. WIND: Hurricane conditions will continue to spread northwestward into the central and northwestern Bahamas tonight and Saturday. Hurricane conditions are expected to reach the coast within the hurricane warning area in Florida late Saturday and Saturday night. Winds are expected to first reach tropical storm strength on Saturday, making outside preparations difficult or dangerous. Preparations to protect life and property should be rushed to completion. RAINFALL: Isaias is expected to produce the following rain accumulations: Bahamas, Turks and Caicos: 4 to 8 inches. Cuba: 1 to 2 inches, with isolated maximum totals of 4 inches. These rainfall amounts could lead to life-threatening flash and urban flooding, especially in low-lying and poorly drained areas. From Friday night through Tuesday: South Florida into east-Central Florida: 2 to 4 inches, with isolated maximum totals of 6 inches. Northeast Florida into coastal Georgia: 1 to 2 inches. Carolinas into the mid Atlantic, including the southern and central Appalachians: 2 to 4 inches, with isolated maximum totals of 6 inches. Heavy rainfall from Isaias could result in isolated flash and urban flooding, especially in low-lying and poorly drained areas. Isolated minor river flooding is possible across the eastern Carolinas and into Virginia. SURF: Swells generated by Isaias are affecting portions of Hispaniola, eastern Cuba, the Turks and Caicos, and the southeastern and central Bahamas. These swells will spread along the east coast of Florida and the southeastern United States coast on Saturday. 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 Pasch
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Hurricane Isaias Potential Storm Surge Flooding Map
2020-08-01 00:21:34| National Hurricane Center (Atlantic)
Potential Storm Surge Flooding Map last updated Fri, 31 Jul 2020 22:21:34 GMT
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Hurricane Isaias Probabilistic Storm Surge Graphics
2020-07-31 23:53:55| National Hurricane Center (Atlantic)
Probabilistic Storm Surge Graphics last updated Fri, 31 Jul 2020 21:53:55 GMT
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