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Tropical Storm Grace Public Advisory Number 17
2021-08-17 16:52:32| National Hurricane Center (Atlantic)
Issued at 1100 AM EDT Tue Aug 17 2021 000 WTNT32 KNHC 171452 TCPAT2 BULLETIN Tropical Storm Grace Advisory Number 17 NWS National Hurricane Center Miami FL AL072021 1100 AM EDT Tue Aug 17 2021 ...TROPICAL STORM CONDITIONS SPREADING OVER JAMAICA... ...FLOODING RAINS CONTINUING OVER PORTIONS OF HAITI AND SPREADING WESTWARD... SUMMARY OF 1100 AM EDT...1500 UTC...INFORMATION ----------------------------------------------- LOCATION...18.3N 76.8W ABOUT 75 MI...120 KM E OF MONTEGO BAY JAMAICA ABOUT 295 MI...475 KM ESE OF GRAND CAYMAN MAXIMUM SUSTAINED WINDS...50 MPH...85 KM/H PRESENT MOVEMENT...W OR 280 DEGREES AT 15 MPH...24 KM/H MINIMUM CENTRAL PRESSURE...1005 MB...29.68 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: None. SUMMARY OF WATCHES AND WARNINGS IN EFFECT: A Hurricane Watch is in effect for... * Yucatan Peninsula of Mexico from Cabo Catoche to Punta Allen A Tropical Storm Warning is in effect for... * Jamaica * Southern coast of the Cuban provinces of Santiago de Cuba, Granma, Las Tunas, and Camaguey * Cayman Islands A Tropical Storm Watch is in effect for... * Entire coast of Haiti * Southern coast of the Cuban provinces of Ciego de Avila, Sancti Spiritus, Cienfuegos, Matanzas, and Pinar del Rio, as well as Isla de la Juventud. 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. Interests elsewhere in the Yucatan Peninsula of Mexico should monitor the progress of Grace. Additional watches or warnings may be required for portions of the Yucatan coast later today. For storm information specific to your area, please monitor products issued by your national meteorological service. DISCUSSION AND OUTLOOK ---------------------- At 1100 AM EDT (1500 UTC), the center of Tropical Storm Grace was located near latitude 18.3 North, longitude 76.8 West. Grace is moving toward the west near 15 mph (24 km/h). A general westward to west-northwestward motion is expected for the next several days. On the forecast track, the center of Grace will continue to move near the northern coast of Jamaica this afternoon. Grace is forecast to move near or over the Cayman Islands late tonight and early Wednesday, and then approach the Yucatan peninsula of Mexico late Wednesday or early Thursday. Maximum sustained winds are near 50 mph (85 km/h) with higher gusts. Grace is forecast to strengthen into a hurricane on Wednesday, with some additional strengthening possible prior to the center reaching the Yucatan Peninsula. Tropical-storm-force winds extend outward up to 70 miles (110 km) from the center. The estimated minimum central pressure is 1005 mb (29.68 inches). HAZARDS AFFECTING LAND ---------------------- Key messages for Grace can be found in the Tropical Cyclone Discussion under AWIPS header MIATCDAT2, WMO header WTNT42 KNHC and on the web at www.hurricanes.gov/graphics_at2.shtml?key_messages. WIND: Tropical storm conditions are expected in Jamaica today. Tropical storm conditions are possible in portions of Haiti for the next several hours. Tropical storm conditions are expected along the southern coast of Cuba within the warning area this afternoon and evening, and over the Cayman Islands beginning tonight into early Wednesday. Tropical storm conditions are possible along the southern coast of Cuba within the watch area tonight and Wednesday. RAINFALL: The system is expected to produce the following rainfall amounts: Over Haiti...an additional 2 to 4 inches of rain with isolated maximum totals of 15 inches are expected across the southern terrain areas today. This heavy rainfall should lead to flash and urban flooding, and possible mudslides. Over far southern Cuba, Jamaica, the Cayman Islands, and portions of the Yucatan Peninsula....3 to 6 inches of rain with isolated maximum totals of 10 inches are expected through Thursday. This heavy rainfall may lead to flash and urban flooding. STORM SURGE: A dangerous storm surge will raise water levels by as much as 2-4 feet above normal tide levels along the immediate coast near and to the north of where the center makes landfall in the northeastern Yucatan Peninsula late Wednesday or early Thursday. Near the coast,the surge will be accompanied by large and destructive waves. SURF: Swells generated by Grace will continue to affect portions of Hispaniola over the next day or so, and will spread westward to Jamaica, the Cayman Islands, the southern coast of Cuba, and the Yucatan Peninsula of Mexico. 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 EDT. Next complete advisory at 500 PM EDT. $$ Forecaster Pasch
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Tropical Storm Henri Graphics
2021-08-17 16:38:49| National Hurricane Center (Atlantic)
5-Day Uncertainty Track last updated Tue, 17 Aug 2021 14:38:49 GMT Wind Speed Probabilities last updated Tue, 17 Aug 2021 15:35:02 GMT
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Tropical Storm Henri Forecast Discussion Number 7
2021-08-17 16:35:30| National Hurricane Center (Atlantic)
Issued at 1100 AM AST Tue Aug 17 2021 000 WTNT43 KNHC 171435 TCDAT3 Tropical Storm Henri Discussion Number 7 NWS National Hurricane Center Miami FL AL082021 1100 AM AST Tue Aug 17 2021 Henri remains a sheared tropical storm. Geostationary satellite images and microwave data show a relatively large area of deep convection (~200 miles across), but the center of the storm is located near the western edge of the thunderstorms due to ongoing northwesterly vertical wind shear. The latest Dvorak estimates have been steady at 3.0/45 kt from TAFB and SAB, and based on that data, the initial intensity is held at 45 kt. The center of Henri is located roughly 130 miles south-southeast of Bermuda currently, and this will likely be as close as the storm gets to the island. The tropical storm is gradually turning to the west, as expected, and the initial motion is estimated to be 255/5 kt. A subtropical ridge over the western Atlantic is building eastward to the north of Henri, and this feature should steer the storm westward at a slightly faster pace during the next two or three days. After that time, the ridge is expected to weaken and shift farther east as a cut off low or negatively-tilted trough develops over the northeast U.S. This change in the steering pattern should cause Henri to turn northeastward between Bermuda and the east coast of the U.S in the 72-120 h period. The NHC track forecast is a little faster than the previous one in the short term and farther west than the previous one from days 3-5, trending toward the latest consensus models. The northwesterly shear currently affecting Henri is expected to subside later today, and that should allow the storm to gain strength during the next 12-24 hours. However, a round of moderate northerly shear is expected to setup over Henri during the 24-96 hour period. Although this shear would typically cause some weakening, the combination of warm SSTs and increasing mid-level moisture could offset the negative influences of the shear. Therefore, no change in strength is predicted beyond the 24 h period. Some of the models suggest that the shear could lessen again this weekend, so although not explicitly forecast, some strengthening is possible then. FORECAST POSITIONS AND MAX WINDS INIT 17/1500Z 30.4N 64.3W 45 KT 50 MPH 12H 18/0000Z 30.4N 65.1W 50 KT 60 MPH 24H 18/1200Z 30.3N 66.5W 55 KT 65 MPH 36H 19/0000Z 30.3N 68.2W 55 KT 65 MPH 48H 19/1200Z 30.4N 69.7W 55 KT 65 MPH 60H 20/0000Z 30.7N 70.6W 55 KT 65 MPH 72H 20/1200Z 31.6N 71.3W 55 KT 65 MPH 96H 21/1200Z 34.1N 69.6W 55 KT 65 MPH 120H 22/1200Z 37.4N 66.0W 55 KT 65 MPH $$ Forecaster Cangialosi
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Tropical Storm Henri Wind Speed Probabilities Number 7
2021-08-17 16:35:30| National Hurricane Center (Atlantic)
Issued at 1500 UTC TUE AUG 17 2021 000 FONT13 KNHC 171435 PWSAT3 TROPICAL STORM HENRI WIND SPEED PROBABILITIES NUMBER 7 NWS NATIONAL HURRICANE CENTER MIAMI FL AL082021 1500 UTC TUE AUG 17 2021 AT 1500Z THE CENTER OF TROPICAL STORM HENRI WAS LOCATED NEAR LATITUDE 30.4 NORTH...LONGITUDE 64.3 WEST WITH MAXIMUM SUSTAINED WINDS NEAR 45 KTS...50 MPH...85 KM/H. Z INDICATES COORDINATED UNIVERSAL TIME (GREENWICH) ATLANTIC STANDARD TIME (AST)...SUBTRACT 4 HOURS FROM Z TIME EASTERN DAYLIGHT TIME (EDT)...SUBTRACT 4 HOURS FROM Z TIME CENTRAL DAYLIGHT TIME (CDT)...SUBTRACT 5 HOURS FROM Z TIME WIND SPEED PROBABILITY TABLE FOR SPECIFIC LOCATIONS CHANCES OF SUSTAINED (1-MINUTE AVERAGE) WIND SPEEDS OF AT LEAST ...34 KT (39 MPH... 63 KM/H)... ...50 KT (58 MPH... 93 KM/H)... ...64 KT (74 MPH...119 KM/H)... FOR LOCATIONS AND TIME PERIODS DURING THE NEXT 5 DAYS PROBABILITIES FOR LOCATIONS ARE GIVEN AS OP(CP) WHERE OP IS THE PROBABILITY OF THE EVENT BEGINNING DURING AN INDIVIDUAL TIME PERIOD (ONSET PROBABILITY) (CP) IS THE PROBABILITY OF THE EVENT OCCURRING BETWEEN 12Z TUE AND THE FORECAST HOUR (CUMULATIVE PROBABILITY) PROBABILITIES ARE GIVEN IN PERCENT X INDICATES PROBABILITIES LESS THAN 1 PERCENT PROBABILITIES FOR 34 KT AND 50 KT ARE SHOWN AT A GIVEN LOCATION WHEN THE 5-DAY CUMULATIVE PROBABILITY IS AT LEAST 3 PERCENT. PROBABILITIES FOR 34...50...64 KT SHOWN WHEN THE 5-DAY 64-KT CUMULATIVE PROBABILITY IS AT LEAST 1 PERCENT. - - - - WIND SPEED PROBABILITIES FOR SELECTED LOCATIONS - - - - FROM FROM FROM FROM FROM FROM FROM TIME 12Z TUE 00Z WED 12Z WED 00Z THU 12Z THU 12Z FRI 12Z SAT PERIODS TO TO TO TO TO TO TO 00Z WED 12Z WED 00Z THU 12Z THU 12Z FRI 12Z SAT 12Z SUN FORECAST HOUR (12) (24) (36) (48) (72) (96) (120) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - LOCATION KT NANTUCKET MA 34 X X( X) X( X) X( X) X( X) X( X) 4( 4) OCEANA NAS VA 34 X X( X) X( X) X( X) 1( 1) 2( 3) X( 3) CAPE HATTERAS 34 X X( X) X( X) X( X) 3( 3) 3( 6) X( 6) NEW RIVER NC 34 X X( X) X( X) X( X) 2( 2) 3( 5) X( 5) MOREHEAD CITY 34 X X( X) X( X) X( X) 2( 2) 2( 4) X( 4) BERMUDA 34 1 1( 2) 2( 4) 2( 6) 1( 7) 4(11) 3(14) $$ FORECASTER CANGIALOSI
Summary for Tropical Storm Henri (AT3/AL082021)
2021-08-17 16:35:00| National Hurricane Center (Atlantic)
...HENRI HOLDING STEADY IN STRENGTH SOUTH-SOUTHEAST OF BERMUDA... As of 11:00 AM AST Tue Aug 17 the center of Henri was located near 30.4, -64.3 with movement WSW at 6 mph. The minimum central pressure was 1004 mb with maximum sustained winds of about 50 mph.
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