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Summary for Tropical Storm Isaac (AT4/AL092018)
2018-09-12 16:55:40| National Hurricane Center (Atlantic)
...ISAAC SHOULD REACH THE LESSER ANTILLES EARLY THURSDAY... As of 11:00 AM AST Wed Sep 12 the center of Isaac was located near 15.0, -54.7 with movement W at 17 mph. The minimum central pressure was 1000 mb with maximum sustained winds of about 60 mph.
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Tropical Storm Isaac Public Advisory Number 20
2018-09-12 16:55:40| National Hurricane Center (Atlantic)
Issued at 1100 AM AST Wed Sep 12 2018 849 WTNT34 KNHC 121455 TCPAT4 BULLETIN Tropical Storm Isaac Advisory Number 20 NWS National Hurricane Center Miami FL AL092018 1100 AM AST Wed Sep 12 2018 ...ISAAC SHOULD REACH THE LESSER ANTILLES EARLY THURSDAY... SUMMARY OF 1100 AM AST...1500 UTC...INFORMATION ----------------------------------------------- LOCATION...15.0N 54.7W ABOUT 420 MI...675 KM E OF MARTINIQUE ABOUT 455 MI...730 KM E OF GUADELOUPE MAXIMUM SUSTAINED WINDS...60 MPH...95 KM/H PRESENT MOVEMENT...W OR 275 DEGREES AT 17 MPH...28 KM/H MINIMUM CENTRAL PRESSURE...1000 MB...29.53 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: None. SUMMARY OF WATCHES AND WARNINGS IN EFFECT: A Tropical Storm Warning is in effect for... * Martinique * Dominica * Guadeloupe A Tropical Storm Watch is in effect for... * Antigua * Montserrat * St. Kitts and Nevis * Saba and St. Eustatius A Tropical Storm Warning means that tropical storm conditions are expected somewhere within the warning area within 24 to 36 hours. A Tropical Storm Watch means that tropical storm conditions are possible within the watch area, in this case within 24 to 36 hours. Interests elsewhere in the Leeward Islands should monitor the progress of Isaac. For storm information specific to your area, please monitor products issued by your national meteorological service. DISCUSSION AND OUTLOOK ---------------------- At 1100 AM AST (1500 UTC), the center of Tropical Storm Isaac was located by a NOAA Hurricane Hunter aircraft near latitude 15.0 North, longitude 54.7 West. Isaac is moving toward the west near 17 mph (28 km/h), and this general motion with some decrease in forward is expected to continue through the weekend. On the forecast track, Isaac is forecast to move across the central Lesser Antilles and into the eastern Caribbean Sea on Thursday, and then move across the eastern and central Caribbean Sea through Saturday. Aircraft data indicate that maximum sustained winds remain near 60 mph (95 km/h) with higher gusts. Gradual weakening is forecast during the next 72 hours. Tropical-storm-force winds extend outward up to 175 miles (280 km), primarily to the north of the center. The estimated minimum central pressure is 1000 mb (29.53 inches). HAZARDS AFFECTING LAND ---------------------- RAINFALL: Isaac is expected to produce total rainfall accumulations of 2 to 4 inches with isolated amounts up 8 inches across Martinique, Dominica, and Guadeloupe, 1 to 2 inches with isolated amounts to 4 inches across Puerto Rico and the southern United States Virgin Islands, with up to an inch anticipated across the remaining Windward and Leeward Islands. This rainfall may cause life-threatening flash flooding. WIND: Tropical storm conditions are expected on Martinique, Dominica, and Guadeloupe early Thursday. Tropical storm conditions are possible within the tropical storm watch area on Thursday. STORM SURGE: Some coastal flooding is possible in areas of onshore winds. Near the coast, the surge will be accompanied by large waves. SURF: Swells generated by Isaac will begin to affect portions of the Lesser Antilles this afternoon. 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 PM AST. Next complete advisory at 500 PM AST. $$ Forecaster Blake
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Tropical Storm Isaac Forecast Advisory Number 20
2018-09-12 16:55:10| National Hurricane Center (Atlantic)
Issued at 1500 UTC WED SEP 12 2018 083 WTNT24 KNHC 121455 TCMAT4 TROPICAL STORM ISAAC FORECAST/ADVISORY NUMBER 20 NWS NATIONAL HURRICANE CENTER MIAMI FL AL092018 1500 UTC WED SEP 12 2018 CHANGES IN WATCHES AND WARNINGS WITH THIS ADVISORY... NONE. SUMMARY OF WATCHES AND WARNINGS IN EFFECT... A TROPICAL STORM WARNING IS IN EFFECT FOR... * MARTINIQUE * DOMINICA * GUADELOUPE A TROPICAL STORM WATCH IS IN EFFECT FOR... * ANTIGUA * MONTSERRAT * ST. KITTS AND NEVIS * SABA AND ST. EUSTATIUS A TROPICAL STORM WARNING MEANS THAT TROPICAL STORM CONDITIONS ARE EXPECTED SOMEWHERE WITHIN THE WARNING AREA... IN THIS CASE WITHIN 24 TO 36 HOURS. A TROPICAL STORM WATCH MEANS THAT TROPICAL STORM CONDITIONS ARE POSSIBLE WITHIN THE WATCH AREA... IN THIS CASE WITHIN 24 TO 36 HOURS. INTERESTS ELSEWHERE IN THE LEEWARD ISLANDS SHOULD MONITOR THE PROGRESS OF ISAAC. TROPICAL STORM CENTER LOCATED NEAR 15.0N 54.7W AT 12/1500Z POSITION ACCURATE WITHIN 15 NM PRESENT MOVEMENT TOWARD THE WEST OR 275 DEGREES AT 15 KT ESTIMATED MINIMUM CENTRAL PRESSURE 1000 MB MAX SUSTAINED WINDS 50 KT WITH GUSTS TO 60 KT. 50 KT....... 40NE 0SE 0SW 0NW. 34 KT.......120NE 100SE 20SW 150NW. 12 FT SEAS..180NE 60SE 60SW 180NW. 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 15.0N 54.7W AT 12/1500Z AT 12/1200Z CENTER WAS LOCATED NEAR 14.7N 53.6W FORECAST VALID 13/0000Z 15.1N 56.7W MAX WIND 50 KT...GUSTS 60 KT. 50 KT... 20NE 0SE 0SW 0NW. 34 KT...100NE 90SE 0SW 120NW. FORECAST VALID 13/1200Z 15.3N 59.4W MAX WIND 45 KT...GUSTS 55 KT. 34 KT... 90NE 60SE 0SW 90NW. FORECAST VALID 14/0000Z 15.3N 62.6W MAX WIND 45 KT...GUSTS 55 KT. 34 KT... 80NE 40SE 0SW 70NW. FORECAST VALID 14/1200Z 15.4N 65.6W MAX WIND 40 KT...GUSTS 50 KT. 34 KT... 80NE 40SE 0SW 70NW. FORECAST VALID 15/1200Z 15.5N 71.0W MAX WIND 40 KT...GUSTS 50 KT. 34 KT... 70NE 30SE 0SW 50NW. 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 16/1200Z 15.5N 75.0W MAX WIND 35 KT...GUSTS 45 KT. OUTLOOK VALID 17/1200Z...DISSIPATED REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 15.0N 54.7W NEXT ADVISORY AT 12/2100Z $$ FORECASTER BLAKE
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Summary for Tropical Storm Isaac (AT4/AL092018)
2018-09-12 14:26:11| National Hurricane Center (Atlantic)
...NOAA HURRICANE HUNTER APPROACHING ISAAC... As of 8:00 AM AST Wed Sep 12 the center of Isaac was located near 14.4, -54.1 with movement W at 15 mph. The minimum central pressure was 1000 mb with maximum sustained winds of about 60 mph.
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Tropical Storm Isaac Public Advisory Number 19A
2018-09-12 14:26:11| National Hurricane Center (Atlantic)
Issued at 800 AM AST Wed Sep 12 2018 357 WTNT34 KNHC 121225 CCA TCPAT4 BULLETIN Tropical Storm Isaac Intermediate Advisory Number 19A...Corrected NWS National Hurricane Center Miami FL AL092018 800 AM AST Wed Sep 12 2018 Corrected latitude to 14.4N in the discussion section ...NOAA HURRICANE HUNTER APPROACHING ISAAC... SUMMARY OF 800 AM AST...1200 UTC...INFORMATION ---------------------------------------------- LOCATION...14.4N 54.1W ABOUT 450 MI...725 KM E OF MARTINIQUE MAXIMUM SUSTAINED WINDS...60 MPH...95 KM/H PRESENT MOVEMENT...W OR 270 DEGREES AT 15 MPH...24 KM/H MINIMUM CENTRAL PRESSURE...1000 MB...29.53 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: None. SUMMARY OF WATCHES AND WARNINGS IN EFFECT: A Tropical Storm Warning is in effect for... * Martinique * Dominica * Guadeloupe A Tropical Storm Watch is in effect for... * Antigua * Montserrat * St. Kitts and Nevis * Saba and St. Eustatius 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, in this case within 36 to 48 hours. Interests elsewhere in the Leeward Islands should monitor the progress of Isaac. For storm information specific to your area, please monitor products issued by your national meteorological service. DISCUSSION AND OUTLOOK ---------------------- At 800 AM AST (1200 UTC), the center of Tropical Storm Isaac was located near latitude 14.4 North, longitude 54.1 West. Isaac is moving toward the west near 15 mph (24 km/h), and this general motion is expected to continue through the weekend. On the forecast track, Isaac's center is forecast to move across the central Lesser Antilles and into the eastern Caribbean Sea on Thursday, and into the central Caribbean Sea on Saturday. Maximum sustained winds remain near 60 mph (95 km/h) with higher gusts. Gradual weakening is forecast during the next few days. A NOAA hurricane hunter aircraft will soon fly through the center of Isaac, and will provide a better assessment of the intensity of the tropical storm and the extent of its winds. Tropical-storm-force winds extend outward up to 105 miles (165 km) from the center. The estimated minimum central pressure is 1000 mb (29.53 inches). HAZARDS AFFECTING LAND ---------------------- RAINFALL: Isaac is expected to produce total rainfall accumulations of 2 to 4 inches with isolated amounts up to 8 inches across Martinique, Dominica, and Guadeloupe, with up to one inch anticipated across the remaining Windward and Leeward Islands. WIND: Tropical storm conditions are expected on Martinique, Dominica, and Guadeloupe by tonight or early Thursday. Tropical storm conditions are possible within the tropical storm watch area on Thursday. STORM SURGE: Some coastal flooding is possible in areas of onshore winds. Near the coast, the surge will be accompanied by large waves. SURF: Swells generated by Isaac will begin to affect portions of the Lesser Antilles this afternoon. 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 AM AST. $$ Forecaster Cangialosi
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