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Tropical Storm Grace Forecast Discussion Number 4
2021-08-14 10:40:14| National Hurricane Center (Atlantic)
Issued at 500 AM AST Sat Aug 14 2021 000 WTNT42 KNHC 140840 TCDAT2 Tropical Storm Grace Discussion Number 4 NWS National Hurricane Center Miami FL AL072021 500 AM AST Sat Aug 14 2021 The cyclone has become a little better organized overnight, with an area of concentrated convection persisting over the center for the past several hours. The system remains compact, with the convective canopy about 100 n mi in diameter, while earlier ASCAT data revealed winds greater than 25 kt extended only about 30 n mi from its center, with peak winds of 27 kt. Despite the weaker maximum winds sampled earlier this evening, the increase in organization of such a small system has likely produced a notable increase in the surface winds near the center. In addition the latest Dvorak intensity estimates from TAFB, SAB, and the UW-CIMSS ADT and SATCON suggest that the intensity is now somewhere between 30 and 45 kt. Based on a conservative blend of these values, it is estimated that the Tropical Depression Seven has strengthened into 35-kt Tropical Storm Grace. Grace continues to move quickly westward, with an initial motion of 280/19 kt. A strong mid-level ridge to the north of the storm should continue to steer it westward for the next few days. Beyond that time, the forecast models begin to diverge in their track solutions, as they vary in the strength of the ridge. Overall, the models have trended toward a stronger, more persistent ridge to the north of the cyclone for the latter half of the forecast period, and as such the model solutions are generally showing a track that lies a bit south of the previous runs for those time periods. The official NHC forecast track is little changed through 72 h and lies near the middle of the tightly clustered track guidance. Beyond 72 h, the forecast track has been shifted slightly to the south, but still lies to north of the consensus model tracks. The earlier bout of wind shear that had entrained surrounding dry air into Grace appears to have abated, at least in the short term. And, global models indicate that the shear will remain low for about the next 24-36 h while the cyclone moves over increasing SSTs. Therefore, it is reasonable to assume that strengthening should occur over the next day or so. Thereafter, the intensity forecast becomes somewhat complicated as the system is forecast to interact with an upper-level trough while possibly crossing the Greater Antilles at the same time. Slight weakening is indicated in the NHC intensity forecast as the system crosses the northern portion of the Dominican Republic early next week. Thereafter, moderate to strong northerly shear is forecast to impact Grace as the system moves into the flow on the western side of an upper-level trough over the western Atlantic. This shear should prevent any further strengthening through the end of the forecast period. The intensity forecast is a little lower than a blend of the NOAA HCCA and IVCN consensus, as there is likely a high bias from the HWRF in these solutions. The latter portion of the NHC intensity forecast is of lower-than-normal confidence due to the potential for a longer amount of time over the rugged terrain of the Greater Antilles than indicated, and also due to the fragile nature of the small cyclone and the possible effects of the stronger shear later in the forecast period. Key Messages: 1. Tropical storm conditions are expected in portions of the Leeward Islands by tonight or early Sunday, and the U.S. Virgin Islands and Puerto Rico on Sunday. Tropical storm conditions are also possible over the British Virgin Islands on Sunday. The risk of strong winds will then spread westward to the Dominican Republic Sunday night and Monday. 2. Heavy rainfall could lead to flash and urban flooding over the Leeward and Virgin Islands. Across Puerto Rico, heavy rainfall may lead to flash, urban and small stream flooding, along with the potential for mudslides. 3. There is a risk of wind and rainfall impacts across Haiti, the Turks and Caicos Islands, the southeastern Bahamas, Cuba, and Florida next week, and interests in those areas should monitor the progress of this system. FORECAST POSITIONS AND MAX WINDS INIT 14/0900Z 15.8N 55.6W 35 KT 40 MPH 12H 14/1800Z 16.2N 58.5W 35 KT 40 MPH 24H 15/0600Z 16.9N 61.8W 40 KT 45 MPH 36H 15/1800Z 17.7N 64.8W 45 KT 50 MPH 48H 16/0600Z 18.3N 67.3W 45 KT 50 MPH 60H 16/1800Z 18.9N 69.4W 40 KT 45 MPH...INLAND 72H 17/0600Z 19.8N 71.5W 40 KT 45 MPH...INLAND 96H 18/0600Z 21.9N 75.6W 40 KT 45 MPH...OVER WATER 120H 19/0600Z 24.5N 79.7W 40 KT 45 MPH $$ Forecaster Latto
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Tropical Storm Grace Forecast Advisory Number 4
2021-08-14 10:39:05| National Hurricane Center (Atlantic)
Issued at 0900 UTC SAT AUG 14 2021 000 WTNT22 KNHC 140838 TCMAT2 TROPICAL STORM GRACE FORECAST/ADVISORY NUMBER 4 NWS NATIONAL HURRICANE CENTER MIAMI FL AL072021 0900 UTC SAT AUG 14 2021 CHANGES IN WATCHES AND WARNINGS WITH THIS ADVISORY... A TROPICAL STORM WARNING HAS BEEN ISSUED FOR THE U.S. VIRGIN ISLANDS AND PUERTO RICO...INCLUDING VIEQUES AND CULEBRA. SUMMARY OF WATCHES AND WARNINGS IN EFFECT... A TROPICAL STORM WARNING IS IN EFFECT FOR... * ANTIGUA AND BARBUDA...ANGUILLA...ST. KITTS AND NEVIS...AND MONTSERRAT * SABA AND SINT EUSTATIUS * SINT MAARTEN * ST. MARTIN AND ST. BARTHELEMY * U.S. VIRGIN ISLANDS * PUERTO RICO...INCLUDING VIEQUES AND CULEBRA A TROPICAL STORM WATCH IS IN EFFECT FOR... * BRITISH VIRGIN ISLANDS 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 IN THE DOMINICAN REPUBLIC SHOULD MONITOR THE PROGRESS OF THIS SYSTEM. ADDITIONAL WATCHES AND WARNINGS WILL LIKELY BE REQUIRED FOR THIS AREA LATER TODAY. TROPICAL STORM CENTER LOCATED NEAR 15.8N 55.6W AT 14/0900Z POSITION ACCURATE WITHIN 30 NM PRESENT MOVEMENT TOWARD THE WEST OR 280 DEGREES AT 19 KT ESTIMATED MINIMUM CENTRAL PRESSURE 1007 MB MAX SUSTAINED WINDS 35 KT WITH GUSTS TO 45 KT. 34 KT....... 20NE 0SE 0SW 20NW. 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 15.8N 55.6W AT 14/0900Z AT 14/0600Z CENTER WAS LOCATED NEAR 15.6N 54.7W FORECAST VALID 14/1800Z 16.2N 58.5W MAX WIND 35 KT...GUSTS 45 KT. 34 KT... 20NE 0SE 0SW 20NW. FORECAST VALID 15/0600Z 16.9N 61.8W MAX WIND 40 KT...GUSTS 50 KT. 34 KT... 30NE 0SE 0SW 30NW. FORECAST VALID 15/1800Z 17.7N 64.8W MAX WIND 45 KT...GUSTS 55 KT. 34 KT... 40NE 0SE 0SW 40NW. FORECAST VALID 16/0600Z 18.3N 67.3W MAX WIND 45 KT...GUSTS 55 KT. 34 KT... 40NE 0SE 0SW 40NW. FORECAST VALID 16/1800Z 18.9N 69.4W...INLAND MAX WIND 40 KT...GUSTS 50 KT. 34 KT... 40NE 30SE 0SW 40NW. FORECAST VALID 17/0600Z 19.8N 71.5W...INLAND MAX WIND 40 KT...GUSTS 50 KT. 34 KT... 40NE 30SE 0SW 40NW. 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 18/0600Z 21.9N 75.6W...OVER WATER MAX WIND 40 KT...GUSTS 50 KT. OUTLOOK VALID 19/0600Z 24.5N 79.7W MAX WIND 40 KT...GUSTS 50 KT. REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 15.8N 55.6W INTERMEDIATE PUBLIC ADVISORY...WTNT32 KNHC/MIATCPAT2...AT 14/1200Z NEXT ADVISORY AT 14/1500Z $$ FORECASTER LATTO
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Tropical Depression Fred Public Advisory Number 18A
2021-08-14 07:40:38| National Hurricane Center (Atlantic)
Issued at 200 AM EDT Sat Aug 14 2021 290 WTNT31 KNHC 140540 TCPAT1 BULLETIN Tropical Depression Fred Intermediate Advisory Number 18A NWS National Hurricane Center Miami FL AL062021 200 AM EDT Sat Aug 14 2021 ...DISORGANIZED FRED CONTINUES TO PRODUCE HEAVY RAINS ACROSS CENTRAL CUBA... SUMMARY OF 200 AM EDT...0600 UTC...INFORMATION ---------------------------------------------- LOCATION...22.9N 81.0W ABOUT 20 MI...30 KM SE OF VARADERO CUBA ABOUT 130 MI...205 KM SSE OF KEY WEST FLORIDA MAXIMUM SUSTAINED WINDS...35 MPH...55 KM/H PRESENT MOVEMENT...W OR 280 DEGREES AT 12 MPH...19 KM/H MINIMUM CENTRAL PRESSURE...1013 MB...29.92 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: None. SUMMARY OF WATCHES AND WARNINGS IN EFFECT: A Tropical Storm Warning is in effect for... * The Florida Keys west of the Seven Mile Bridge to the Dry Tortugas A Tropical Storm Warning means that tropical storm conditions are expected somewhere within the warning area, in this case within the next 24 hours. Interests in Cuba and in the Florida peninsula and Florida Panhandle should monitor the progress of Fred. Watches could be required for portions of the Florida panhandle later today. 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 200 AM EDT (0600 UTC), the center of Tropical Depression Fred was located near latitude 22.9 North, longitude 81.0 West. The depression is moving toward the west near 12 mph (19 km/h). A turn to the west-northwest is expected to occur later this morning, followed by a northwest motion by tonight. On the forecast track, Fred is expected to pass near or west of the lower Florida Keys this afternoon, move across the eastern Gulf of Mexico tonight and Sunday, and move inland over the northern Gulf coast on Monday. Maximum sustained winds are near 35 mph (55 km/h) with higher gusts. Slow strengthening is forecast, and Fred could become a tropical storm again by tonight. The estimated minimum central pressure is 1013 mb (29.92 inches). HAZARDS AFFECTING LAND ---------------------- Key messages for Fred can be found in the Tropical Cyclone Discussion under AWIPS header MIATCDAT1, WMO header WTNT41 KNHC and on the web at www.hurricanes.gov/graphics_at1.shtml?key_messages. RAINFALL: Tropical Depression Fred is expected to produce the following rainfall amounts: Portions of Cuba...2 to 5 inches with isolated maximum totals of 8 inches. This rainfall may lead to scattered flash flooding. Across the Bahamas...1 to 3 inches, with isolated maximum totals of 5 inches. Through Monday, 3 to 5 inches of rain with local amounts of 8 inches is anticipated across the Keys and southern Florida. Across the Florida Big Bend and Panhandle, 3 to 7 inches with isolated maximum totals of 10 inches are expected. Heavy rainfall could lead to areal, urban, and small stream flooding impacts, and cause new minor flooding across the western Florida Peninsula and exacerbate ongoing minor to isolated moderate flooding in northern Florida. From Monday onward, heavy rain and flood impacts could extend into inland portions of the Southeast and into the southern and central Appalachians and Piedmont as Fred interacts with a front in the area. WIND: Tropical storm conditions are expected in portions of the warning area across the Florida Keys later today. SURF: Swells generated by Fred are expected to spread across the Florida Keys later this morning and reach the coast of Alabama and the Florida Panhandle on Monday. Please consult products from your local weather office for more details. TORNADOES: A tornado or two may be possible starting this afternoon across portions of central and southern Florida. NEXT ADVISORY ------------- Next complete advisory at 500 AM EDT. $$ Forecaster Cangialosi
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Tropical Depression Seven Public Advisory Number 3A
2021-08-14 07:40:38| National Hurricane Center (Atlantic)
Issued at 200 AM AST Sat Aug 14 2021 291 WTNT32 KNHC 140540 TCPAT2 BULLETIN Tropical Depression Seven Intermediate Advisory Number 3A NWS National Hurricane Center Miami FL AL072021 200 AM AST Sat Aug 14 2021 ...DEPRESSION EXPECTED TO BECOME A TROPICAL STORM LATER TODAY... SUMMARY OF 200 AM AST...0600 UTC...INFORMATION ---------------------------------------------- LOCATION...15.6N 54.7W ABOUT 480 MI...770 KM E OF THE LEEWARD ISLANDS MAXIMUM SUSTAINED WINDS...35 MPH...55 KM/H PRESENT MOVEMENT...W OR 280 DEGREES AT 21 MPH...33 KM/H MINIMUM CENTRAL PRESSURE...1010 MB...29.83 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: None. SUMMARY OF WATCHES AND WARNINGS IN EFFECT: A Tropical Storm Warning is in effect for... * Antigua and Barbuda, Anguilla, St. Kitts and Nevis, and Montserrat * Saba and Sint Eustatius * Sint Maarten * St. Martin and St. Barthelemy A Tropical Storm Watch is in effect for... * British Virgin Islands * U.S. Virgin Islands * Puerto Rico, including Vieques and Culebra 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 the Leeward Islands, as well as the Dominican Republic, should monitor the progress of this system. Additional watches and warnings will likely be required for these areas tonight or on Saturday. 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 AST (0600 UTC), the center of Tropical Depression Seven was located near latitude 15.6 North, longitude 54.7 West. The depression is moving toward the west near 21 mph (33 km/h). A motion towards the west or west-northwest with a gradual decrease in forward speed is expected during the next few days. On the forecast track, the center of the depression is forecast to move over the Leeward Islands tonight, over the Virgin Islands and Puerto Rico on Sunday, and then over the Dominican Republic on Monday. Maximum sustained winds are near 35 mph (55 km/h) with higher gusts. Some strengthening is forecast during the next couple of days, and the depression is expected to become a tropical storm later today. The estimated minimum central pressure is 1010 mb (29.83 inches). HAZARDS AFFECTING LAND ---------------------- Key messages for Tropical Depression Seven can be found in the Tropical Cyclone Discussion under AWIPS header MIATCDAT2 and WMO header WTNT42 KNHC and on the web at www.hurricanes.gov/graphics_at2.shtml?key_messages. WIND: Tropical storm conditions are expected within the warning area over the Leeward Islands by tonight or early Sunday. Tropical storm conditions are possible over the Virgin Islands and Puerto Rico beginning on Sunday. RAINFALL: The system is expected to produce the following rainfall amounts today into Monday: Over the northern Leeward Islands and Virgin Islands...3 to 6 inches. This rainfall may produce scattered areas of flash and urban flooding. Over Puerto Rico...3 to 6 inches. Heavy rainfall could lead to flash, urban, and small stream flooding as well as potential mudslides. NEXT ADVISORY ------------- Next complete advisory at 500 AM AST. $$ Forecaster Latto
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Hurricane Linda Forecast Discussion Number 16
2021-08-14 05:03:25| Tropical Depression LIDIA
Issued at 900 PM MDT FRI AUG 13 2021
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