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Tropical Storm Fred Forecast Discussion Number 6

2021-08-11 04:55:50| National Hurricane Center (Atlantic)

Issued at 1100 PM AST Tue Aug 10 2021 000 WTNT41 KNHC 110255 TCDAT1 Tropical Storm Fred Discussion Number 6 NWS National Hurricane Center Miami FL AL062021 1100 PM AST Tue Aug 10 2021 Data from satellites, the San Juan NOAA Doppler weather radar, and an Air Force Reserve Unit reconnaissance aircraft indicate that the low-level circulation has become better defined since the previous advisory and,thus, the disturbance has been upgraded to Tropical Storm Fred. Although the surface and low-level circulations are vertically aligned, radar data indicate that the mid-level circulation is still tilted about 40 n mi to the south. However, that mid-level feature has been steadily gaining ground from its earlier 100-nmi southeastward displacement. Radar Doppler velocity data, aircraft 850-mb flight-level wind data of 43 kt and SFMR surface winds of 33 kt, plus earlier surface observations of sustained 33-kt winds, support an initial intensity of 35 kt. The initial motion estimate is westward or 270/15 kt. However, this should be a short-term motion overnight due to interaction with the mountainous terrain of Puerto Rico to the north. By early Wednesday morning, Fred is expected to resume a west-northwestward motion and pass through the Mona Passage, reaching the eastern Dominican Republic shortly after sunrise. A strong subtropical ridge to the north of the cyclone is forecast by the global models to basically remain static across the central and western Atlantic Ocean for the next five days. Given this pattern, Fred is expected to maintain a west-northwestward motion through 96 hours, remaining just offshore the north coast of Haiti and Cuba during that time. After emerging over the southeastern Gulf of Mexico on day 4, Fred is forecast to gradually turn more north-northwestward as the cyclone rounds the southwestern periphery of the aforementioned ridge. The latest NHC track forecast models strongly support this track scenario, although there was a slight northward shift in the guidance envelope on this cycle. The new official track forecast was shifted a little north of the previous one through 72 hours, and then lies down the middle of the tightly packed track consensus models. Conditions remain favorable for some strengthening before Fred reaches Hispaniola in about 12 h, but the intensity likely won't be much stronger than 40-45 kt at landfall. Interaction with the mountainous terrain of Hispaniola on Wednesday should result in some weakening, but tropical-storm-force winds could occur along the the north coast of the island if the center shifts a little more to right of the forecast track. After emerging back over water by late Wednesday, only slow strengthening is forecast in the 36-60-h time period due to westerly vertical wind shear of about 20 kt expected to affect the cyclone. On days 4 and 5, however, Fred is expected to be moving over warmer sea-surface temperatures and into a much weaker wind shear regime, which would favor more robust strengthening. As a result, some of the regional and statistical- dynamical intensity models bring Fred near or to hurricane strength during that time. However, there is uncertainty Fred's structure after interaction with Hispaniola and possibly Cuba, and continued disagreement between the global models on how the upper-level wind flow pattern near the cyclone will evolve, which ranges from favorable anticyclonic outflow to strong southwesterly shear. Given these factors, the NHC intensity forecast was only nudged slightly higher than the previous advisory, and lies between the consensus models HCCA and IVCN, and the SHIPS and LGEM models. KEY MESSAGES: 1. Tropical storm conditions are expected in portions of the U.S. Virgin Islands and Puerto Rico tonight, and are expected to begin in the Dominican Republic Wednesday morning. Tropical storm conditions are possible in northern Haiti and the southeastern Bahamas by late Wednesday. 2. Heavy rainfall could lead to flash, urban, and small stream flooding, along with possible rapid river rises and the potential for mudslides across the U.S. Virgin Islands, Puerto Rico, and the Dominican Republic. The greatest threat for flooding impacts will be across eastern and southern Puerto Rico. 3. There is a risk of wind and rainfall impacts elsewhere in portions of Hispaniola, the Bahamas, and Cuba during the next several days, although the forecast is more uncertain than usual since Fred is forecast to interact with Hispaniola on Wednesday. Interests in these areas should monitor Fred's progress and updates to the forecast. 4. There is a risk of wind and rainfall impacts in Florida beginning Friday in the Keys and spreading northward through portions of the Peninsula and the Panhandle this weekend. However, it is too soon to determine the exact timing, location, and magnitude of any potential impacts. Interests throughout Florida should monitor Fred's progress and check updates to the forecast. FORECAST POSITIONS AND MAX WINDS INIT 11/0300Z 17.4N 66.8W 35 KT 40 MPH 12H 11/1200Z 18.6N 68.9W 40 KT 45 MPH...INLAND 24H 12/0000Z 19.9N 71.4W 35 KT 40 MPH...INLAND 36H 12/1200Z 20.9N 73.7W 35 KT 40 MPH...OVER WATER 48H 13/0000Z 21.8N 76.0W 35 KT 40 MPH 60H 13/1200Z 22.8N 78.0W 35 KT 40 MPH 72H 14/0000Z 23.8N 79.9W 40 KT 45 MPH 96H 15/0000Z 26.5N 82.8W 45 KT 50 MPH 120H 16/0000Z 29.3N 84.6W 55 KT 65 MPH $$ Forecaster Stewart

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Tropical Storm Fred Wind Speed Probabilities Number 6

2021-08-11 04:54:49| National Hurricane Center (Atlantic)

Issued at 0300 UTC WED AUG 11 2021 000 FONT11 KNHC 110254 PWSAT1 TROPICAL STORM FRED WIND SPEED PROBABILITIES NUMBER 6 NWS NATIONAL HURRICANE CENTER MIAMI FL AL062021 0300 UTC WED AUG 11 2021 AT 0300Z THE CENTER OF TROPICAL STORM FRED WAS LOCATED NEAR LATITUDE 17.4 NORTH...LONGITUDE 66.8 WEST WITH MAXIMUM SUSTAINED WINDS NEAR 35 KTS...40 MPH...65 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 00Z WED 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 00Z WED 12Z WED 00Z THU 12Z THU 00Z FRI 00Z SAT 00Z SUN PERIODS TO TO TO TO TO TO TO 12Z WED 00Z THU 12Z THU 00Z FRI 00Z SAT 00Z SUN 00Z MON FORECAST HOUR (12) (24) (36) (48) (72) (96) (120) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - LOCATION KT KINGS BAY GA 34 X X( X) X( X) X( X) X( X) 2( 2) 4( 6) WAYCROSS GA 34 X X( X) X( X) X( X) X( X) X( X) 4( 4) MAYPORT NS FL 34 X X( X) X( X) X( X) X( X) 2( 2) 5( 7) JACKSONVILLE 34 X X( X) X( X) X( X) X( X) 1( 1) 3( 4) GAINESVILLE FL 34 X X( X) X( X) X( X) X( X) 1( 1) 5( 6) DAYTONA BEACH 34 X X( X) X( X) X( X) X( X) 1( 1) 4( 5) THE VILLAGES 34 X X( X) X( X) X( X) X( X) 2( 2) 4( 6) ORLANDO FL 34 X X( X) X( X) X( X) X( X) 3( 3) 3( 6) COCOA BEACH FL 34 X X( X) X( X) X( X) 1( 1) 4( 5) 3( 8) PATRICK AFB 34 X X( X) X( X) X( X) 1( 1) 4( 5) 3( 8) FT PIERCE FL 34 X X( X) X( X) X( X) 2( 2) 4( 6) 3( 9) W PALM BEACH 34 X X( X) X( X) X( X) 4( 4) 6(10) 2(12) FT LAUDERDALE 34 X X( X) X( X) X( X) 5( 5) 7(12) 1(13) MIAMI FL 34 X X( X) X( X) X( X) 3( 3) 5( 8) 1( 9) HOMESTEAD ARB 34 X X( X) X( X) X( X) 3( 3) 4( 7) 2( 9) MARATHON FL 34 X X( X) X( X) X( X) 9( 9) 10(19) 2(21) MARATHON FL 50 X X( X) X( X) X( X) 1( 1) 2( 3) 1( 4) KEY WEST FL 34 X X( X) X( X) X( X) 6( 6) 11(17) 1(18) KEY WEST FL 50 X X( X) X( X) X( X) 1( 1) 2( 3) 1( 4) NAPLES FL 34 X X( X) X( X) X( X) 4( 4) 12(16) 4(20) NAPLES FL 50 X X( X) X( X) X( X) X( X) 2( 2) 2( 4) FT MYERS FL 34 X X( X) X( X) X( X) 1( 1) 6( 7) 4(11) VENICE FL 34 X X( X) X( X) X( X) 1( 1) 12(13) 7(20) VENICE FL 50 X X( X) X( X) X( X) X( X) 1( 1) 3( 4) TAMPA FL 34 X X( X) X( X) X( X) 1( 1) 7( 8) 9(17) TAMPA FL 50 X X( X) X( X) X( X) X( X) 1( 1) 2( 3) CEDAR KEY FL 34 X X( X) X( X) X( X) X( X) 5( 5) 11(16) CEDAR KEY FL 50 X X( X) X( X) X( X) X( X) X( X) 3( 3) TALLAHASSEE FL 34 X X( X) X( X) X( X) X( X) 1( 1) 8( 9) ST MARKS FL 34 X X( X) X( X) X( X) X( X) 1( 1) 9(10) APALACHICOLA 34 X X( X) X( X) X( X) X( X) 4( 4) 15(19) APALACHICOLA 50 X X( X) X( X) X( X) X( X) X( X) 4( 4) APALACHICOLA 64 X X( X) X( X) X( X) X( X) X( X) 1( 1) GFMX 290N 850W 34 X X( X) X( X) X( X) X( X) 6( 6) 15(21) GFMX 290N 850W 50 X X( X) X( X) X( X) X( X) 1( 1) 5( 6) GFMX 290N 850W 64 X X( X) X( X) X( X) X( X) X( X) 1( 1) PANAMA CITY FL 34 X X( X) X( X) X( X) X( X) 2( 2) 14(16) PANAMA CITY FL 50 X X( X) X( X) X( X) X( X) X( X) 4( 4) PANAMA CITY FL 64 X X( X) X( X) X( X) X( X) X( X) 1( 1) DESTIN EXEC AP 34 X X( X) X( X) X( X) X( X) 1( 1) 6( 7) COLUMBUS GA 34 X X( X) X( X) X( X) X( X) X( X) 4( 4) MONTGOMERY AL 34 X X( X) X( X) X( X) X( X) X( X) 4( 4) WHITING FLD FL 34 X X( X) X( X) X( X) X( X) 1( 1) 5( 6) PENSACOLA FL 34 X X( X) X( X) X( X) X( X) 1( 1) 5( 6) GFMX 290N 870W 34 X X( X) X( X) X( X) X( X) 1( 1) 10(11) MOBILE AL 34 X X( X) X( X) X( X) X( X) X( X) 4( 4) GFMX 280N 890W 34 X X( X) X( X) X( X) X( X) 1( 1) 3( 4) GRAND BAHAMA 34 X X( X) X( X) X( X) 4( 4) 3( 7) 1( 8) NEW PROVIDENCE 34 X X( X) X( X) 2( 2) 6( 8) 1( 9) 1(10) ANDROS 34 X X( X) X( X) 3( 3) 9(12) 2(14) X(14) GREAT EXUMA 34 X X( X) 1( 1) 7( 8) 3(11) X(11) X(11) SAN SALVADOR 34 X X( X) 1( 1) 3( 4) 1( 5) X( 5) X( 5) MAYAGUANA 34 X 1( 1) 6( 7) 2( 9) X( 9) X( 9) X( 9) GRAND TURK 34 X 6( 6) 4(10) X(10) X(10) X(10) X(10) HAVANA 34 X X( X) X( X) X( X) 2( 2) 4( 6) 1( 7) CIENFUEGOS 34 X X( X) X( X) X( X) 2( 2) 1( 3) X( 3) CAMAGUEY 34 X X( X) X( X) 1( 1) 4( 5) X( 5) X( 5) GUANTANAMO BAY 34 X X( X) X( X) 3( 3) X( 3) X( 3) X( 3) PUERTO PLATA 34 2 25(27) 1(28) X(28) X(28) X(28) X(28) PUERTO PLATA 50 X 3( 3) X( 3) X( 3) X( 3) X( 3) X( 3) SANTO DOMINGO 34 10 5(15) X(15) X(15) X(15) X(15) X(15) PONCE PR 34 32 X(32) X(32) X(32) X(32) X(32) X(32) AGUADILLA PR 34 45 X(45) X(45) X(45) X(45) X(45) X(45) $$ FORECASTER STEWART

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Tropical Storm Linda Forecast Information (.shp)

2021-08-11 04:52:21| Tropical Depression LIDIA

GIS Data last updated Wed, 11 Aug 2021 02:52:21 GMT

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Summary for Tropical Storm Kevin (EP1/EP112021)

2021-08-11 04:52:15| National Hurricane Center (East Pacific)

...POORLY ORGANIZED KEVIN MOVING SLOWLY NORTHWESTWARD... As of 8:00 PM PDT Tue Aug 10 the center of Kevin was located near 19.5, -115.4 with movement NW at 8 mph. The minimum central pressure was 999 mb with maximum sustained winds of about 50 mph.

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Tropical Storm Kevin Public Advisory Number 15

2021-08-11 04:52:15| National Hurricane Center (East Pacific)

Issued at 800 PM PDT Tue Aug 10 2021 824 WTPZ31 KNHC 110252 TCPEP1 BULLETIN Tropical Storm Kevin Advisory Number 15 NWS National Hurricane Center Miami FL EP112021 800 PM PDT Tue Aug 10 2021 ...POORLY ORGANIZED KEVIN MOVING SLOWLY NORTHWESTWARD... SUMMARY OF 800 PM PDT...0300 UTC...INFORMATION ---------------------------------------------- LOCATION...19.5N 115.4W ABOUT 425 MI...685 KM WSW OF THE SOUTHERN TIP OF BAJA CALIFORNIA MAXIMUM SUSTAINED WINDS...50 MPH...85 KM/H PRESENT MOVEMENT...NW OR 320 DEGREES AT 8 MPH...13 KM/H MINIMUM CENTRAL PRESSURE...999 MB...29.50 INCHES WATCHES AND WARNINGS -------------------- There are no coastal watches or warnings in effect. DISCUSSION AND OUTLOOK ---------------------- At 800 PM PDT (0300 UTC), the center of Tropical Storm Kevin was located near latitude 19.5 North, longitude 115.4 West. Kevin is moving toward the northwest near 8 mph (13 km/h). A general northwestward or west-northwestward motion is expected over the next several days. Maximum sustained winds are near 50 mph (85 km/h) with higher gusts. Gradual weakening is expected to begin tomorrow and Kevin is forecast to weaken to a tropical depression by Thursday. Tropical-storm-force winds extend outward up to 185 miles (295 km) from the center. The estimated minimum central pressure is 999 mb (29.50 inches). HAZARDS AFFECTING LAND ---------------------- SURF: Swells generated by Kevin are affecting portions of the coast of southwestern Mexico, and will spread northward along the coast of Baja California Sur over the next day or so. 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 200 AM PDT. $$ Forecaster Papin/Stewart

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