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Tropical Storm Grace Forecast Discussion Number 16

2021-08-17 10:59:57| National Hurricane Center (Atlantic)

Issued at 500 AM EDT Tue Aug 17 2021 000 WTNT42 KNHC 170859 TCDAT2 Tropical Storm Grace Discussion Number 16 NWS National Hurricane Center Miami FL AL072021 500 AM EDT Tue Aug 17 2021 An Air Force Reserve reconnaissance aircraft had difficulty locating the center of Grace early this morning. The last few visible satellite images along with 0200Z ASCAT wind data indicated that a lee-side surface low had formed south of the western tip of Haiti. That feature has gradually been pulling northward closer to the deep convection that has developed near the well-defined mid-level circulation center. The initial position is the midpoint between the recon position in the latest vortex message and the mid-level circulation noted in passive microwave imagery. The aircraft also found some patches of 925-mb flight-level winds of 48-51 kt, which equates to surface winds of 36-38 kt. Reliable SFMR surface winds obtained by the aircraft were also in the 36-38-kt range. Based on these data, Grace was upgraded back to a 35-kt tropical storm at 0600 UTC. Regardless of Grace's exact intensity right now, the immediate threat is still torrential rainfall across western Hispaniola today and over Jamaica this afternoon and tonight, which will likely cause severe flooding in some locations. The initial motion estimate is an uncertain 280/14 kt. A strong mid-level ridge is forecast to build westward across Florida and the Gulf of Mexico during the next several days, which should keep Grace on a westward or west-northwestward track through the 120-h forecast period. Only a very sight southward shift in the previous forecast track was made, which was due primarily to the new estimated southerly initial position, and the new NHC forecast track lies along the northern edge of model guidance envelope. Once Grace passes Jamaica in 12-18 hours, the cyclone will be passing over water temperatures near 30 deg C and into a more divergent upper-level wind flow pattern. These two favorable conditions should allow for Grace to slowly intensify and possibly be near hurricane strength by the time the cyclone reaches the Yucatan peninsula in about 48 hours. Thereafter, Grace will weaken as it pass over Yucatan, and then re-strengthen some over the Bay of Campeche before reaching mainland Mexico in about 96 hours. The NHC intensity forecast is close to a blend of the HCCA and IVCN consensus models. Key Messages: 1. Heavy rainfall across the Dominican Republic, Haiti, Cuba, Jamaica, the Cayman Islands, and the northern Yucatan Peninsula may lead to flash, urban, and small stream flooding, with the potential for mudslides highest in Haiti and the Dominican Republic. 2. Tropical storm conditions are possible over portions of Hispaniola and over Jamaica on today. Tropical storm conditions are expected over portions of the southern coast of Cuba today, spreading westward to the Cayman Islands and possibly other portions of the southern coast of Cuba this evening through Wednesday morning. 3. There is a increasing risk of wind, rainfall, and storm surge impacts on the Yucatan Peninsula of Mexico Wednesday night and Thursday. Interests there areas should monitor the progress of Grace and updates to the forecast. FORECAST POSITIONS AND MAX WINDS INIT 17/0900Z 18.2N 75.4W 35 KT 40 MPH 12H 17/1800Z 18.6N 77.6W 40 KT 45 MPH 24H 18/0600Z 19.1N 80.7W 45 KT 50 MPH 36H 18/1800Z 19.7N 83.9W 50 KT 60 MPH 48H 19/0600Z 20.4N 87.0W 60 KT 70 MPH 60H 19/1800Z 21.0N 90.0W 50 KT 60 MPH...INLAND 72H 20/0600Z 21.4N 92.7W 55 KT 65 MPH...OVER WATER 96H 21/0600Z 22.0N 97.2W 60 KT 70 MPH 120H 22/0600Z 22.3N 101.4W 30 KT 35 MPH...INLAND $$ Forecaster Stewart

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Tropical Storm Grace Forecast Advisory Number 16

2021-08-17 10:55:55| National Hurricane Center (Atlantic)

Issued at 0900 UTC TUE AUG 17 2021 000 WTNT22 KNHC 170855 TCMAT2 TROPICAL STORM GRACE FORECAST/ADVISORY NUMBER 16 NWS NATIONAL HURRICANE CENTER MIAMI FL AL072021 0900 UTC TUE AUG 17 2021 CHANGES IN WATCHES AND WARNINGS WITH THIS ADVISORY... THE GOVERNMENT OF MEXICO HAS ISSUED A HURRICANE WATCH FOR PORTIONS OF THE YUCATAN PENINSULA FROM CABO CATOCHE SOUTHWARD TO PUNTA ALLEN. 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... * 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 * JAMAICA * 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...GENERALLY WITHIN 48 HOURS. 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. TROPICAL STORM CENTER LOCATED NEAR 18.2N 75.4W AT 17/0900Z POSITION ACCURATE WITHIN 45 NM PRESENT MOVEMENT TOWARD THE WEST OR 280 DEGREES AT 14 KT ESTIMATED MINIMUM CENTRAL PRESSURE 1005 MB MAX SUSTAINED WINDS 35 KT WITH GUSTS TO 45 KT. 34 KT....... 30NE 40SE 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 18.2N 75.4W AT 17/0900Z AT 17/0600Z CENTER WAS LOCATED NEAR 18.0N 74.7W FORECAST VALID 17/1800Z 18.6N 77.6W MAX WIND 40 KT...GUSTS 50 KT. 34 KT... 40NE 40SE 0SW 40NW. FORECAST VALID 18/0600Z 19.1N 80.7W MAX WIND 45 KT...GUSTS 55 KT. 34 KT... 70NE 40SE 0SW 55NW. FORECAST VALID 18/1800Z 19.7N 83.9W MAX WIND 50 KT...GUSTS 60 KT. 50 KT... 20NE 0SE 0SW 20NW. 34 KT... 90NE 70SE 0SW 60NW. FORECAST VALID 19/0600Z 20.4N 87.0W MAX WIND 60 KT...GUSTS 75 KT. 50 KT... 40NE 0SE 0SW 30NW. 34 KT...100NE 80SE 30SW 80NW. FORECAST VALID 19/1800Z 21.0N 90.0W...INLAND MAX WIND 50 KT...GUSTS 60 KT. 50 KT... 20NE 0SE 0SW 30NW. 34 KT...110NE 80SE 40SW 90NW. FORECAST VALID 20/0600Z 21.4N 92.7W...OVER WATER MAX WIND 55 KT...GUSTS 65 KT. 50 KT... 50NE 30SE 0SW 30NW. 34 KT...120NE 70SE 40SW 90NW. 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 21/0600Z 22.0N 97.2W MAX WIND 60 KT...GUSTS 75 KT. OUTLOOK VALID 22/0600Z 22.3N 101.4W...INLAND MAX WIND 30 KT...GUSTS 40 KT. REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 18.2N 75.4W INTERMEDIATE PUBLIC ADVISORY...WTNT32 KNHC/MIATCPAT2...AT 17/1200Z NEXT ADVISORY AT 17/1500Z $$ FORECASTER STEWART

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Tropical Depression Fred Forecast Advisory Number 31

2021-08-17 10:41:06| National Hurricane Center (Atlantic)

Issued at 0900 UTC TUE AUG 17 2021 000 WTNT21 KNHC 170840 TCMAT1 TROPICAL DEPRESSION FRED FORECAST/ADVISORY NUMBER 31 NWS NATIONAL HURRICANE CENTER MIAMI FL AL062021 0900 UTC TUE AUG 17 2021 THERE ARE NO COASTAL WATCHES OR WARNINGS IN EFFECT. TROPICAL DEPRESSION CENTER LOCATED NEAR 32.3N 85.0W AT 17/0900Z POSITION ACCURATE WITHIN 20 NM PRESENT MOVEMENT TOWARD THE NORTH-NORTHEAST OR 15 DEGREES AT 12 KT ESTIMATED MINIMUM CENTRAL PRESSURE 1004 MB MAX SUSTAINED WINDS 30 KT WITH GUSTS TO 40 KT. 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 32.3N 85.0W AT 17/0900Z AT 17/0600Z CENTER WAS LOCATED NEAR 31.7N 85.2W FORECAST VALID 17/1800Z 34.2N 84.3W...INLAND MAX WIND 25 KT...GUSTS 35 KT. FORECAST VALID 18/0600Z 37.0N 82.6W...POST-TROP/INLAND MAX WIND 20 KT...GUSTS 30 KT. FORECAST VALID 18/1800Z 39.6N 80.4W...POST-TROP/INLAND MAX WIND 20 KT...GUSTS 30 KT. FORECAST VALID 19/0600Z...DISSIPATED REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 32.3N 85.0W THIS IS THE LAST FORECAST/ADVISORY ISSUED BY THE NATIONAL HURRICANE CENTER ON TROPICAL DEPRESSON FRED. FUTURE INFORMATION ON THIS SYSTEM CAN BE FOUND IN PUBLIC ADVISORIES ISSUED BY THE WEATHER PREDICTION CENTER BEGINNING AT 11 AM EDT, UNDER AWIPS HEADER TCPAT1, WMO HEADER WTNT31 KWNH, AND ON THE WEB AT HTTP://WWW.WPC.NCEP.NOAA.GOV. $$ FORECASTER STEWART

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Tropical Depression Fred Forecast Discussion Number 31

2021-08-17 10:41:06| National Hurricane Center (Atlantic)

Issued at 400 AM CDT Tue Aug 17 2021 000 WTNT41 KNHC 170840 TCDAT1 Tropical Depression Fred Discussion Number 31 NWS National Hurricane Center Miami FL AL062021 400 AM CDT Tue Aug 17 2021 Fred has moved farther inland and is now located near the border of southwestern Georgia and southeastern Alabama. Between 0400-0600 UTC, Doppler radar data from Tallahassee, Florida, still showed 68-70 kt velocities between 9,000-10,000 ft associated with a solid band of convection in the northeastern quadrant. Using 50 percent of those values supported keeping Fred as a 35-kt tropical storm at 0600 UTC. This intensity was also supported by 30-kt winds on the west side of the low-level circulation noted in surface observations. Since that time, however, the solid band of convection has become fragmented and the thunderstorm activity has broken up into more discrete cells. Satellite and radar imagery also indicate that the mid- and upper-level circulations have decoupled and sheared out to the north of the low-level circulation. As a result, Fred has been downgraded to a tropical depression at the 0900 UTC advisory time. Weakening will continue through today as Fred moves farther inland over Georgia and into the southern Appalachians, with Fred likely becoming a remnant low later tonight before merging with a frontal system over the northern Appalachians on Wednesday. Fred has continued to move north-northeastward, or 015/12 kt. For the remainder of today, Fred should maintain a motion toward the north-northeast or northeast accompanied by a gradual increase forward speed owing to a very stable steering pattern between a deep-layer ridge to the east and a broad mid-tropospheric trough to the west. The new NHC track forecast is essentially just an update of the previous advisory track and lies near the middle of the tightly packed NHC model guidance suite. Although Fred is weakening, the system is still expected to bring flooding rains to portions of the southeastern and eastern United States during the next couple of days. This is the last advisory issued by the National Hurricane Center on Fred. Future information on this system can be found in Public Advisories issued by the Weather Prediction Center beginning at 11 AM ED, under AWIPS header TCPAT1, WMO header WTNT31 KWNH, and on the web at http://www.wpc.ncep.noaa.gov. KEY MESSAGES: 1. Through Tuesday, heavy rainfall may lead to considerable flash, urban, small stream, and isolated river flooding impacts across portions of the Florida Panhandle, southeastern Alabama, and from western Georgia into the southern Appalachians. By the middle of the week, Fred or its remnants will lift northward and impact the central Appalachians and Mid-Atlantic. Landslides are possible across the mountains of North Carolina and Blue Ridge Escarpment on Tuesday. FORECAST POSITIONS AND MAX WINDS INIT 17/0900Z 32.3N 85.0W 30 KT 35 MPH...INLAND 12H 17/1800Z 34.2N 84.3W 25 KT 30 MPH...INLAND 24H 18/0600Z 37.0N 82.6W 20 KT 25 MPH...POST-TROP/INLAND 36H 18/1800Z 39.6N 80.4W 20 KT 25 MPH...POST-TROP/INLAND 48H 19/0600Z...DISSIPATED $$ Forecaster Stewart

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Hurricane Linda Forecast Information (.shp)

2021-08-17 10:40:32| Tropical Depression LIDIA

GIS Data last updated Tue, 17 Aug 2021 08:40:32 GMT

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