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Hurricane Sam Forecast Advisory Number 32

2021-09-30 16:55:07| National Hurricane Center (Atlantic)

Issued at 1500 UTC THU SEP 30 2021 000 WTNT23 KNHC 301454 TCMAT3 HURRICANE SAM FORECAST/ADVISORY NUMBER 32 NWS NATIONAL HURRICANE CENTER MIAMI FL AL182021 1500 UTC THU SEP 30 2021 CHANGES IN WATCHES AND WARNINGS WITH THIS ADVISORY... NONE. SUMMARY OF WATCHES AND WARNINGS IN EFFECT... A TROPICAL STORM WATCH IS IN EFFECT FOR... * BERMUDA A TROPICAL STORM WATCH MEANS THAT TROPICAL STORM CONDITIONS ARE POSSIBLE WITHIN THE WATCH AREA...GENERALLY WITHIN 48 HOURS. HURRICANE CENTER LOCATED NEAR 22.6N 60.0W AT 30/1500Z POSITION ACCURATE WITHIN 15 NM PRESENT MOVEMENT TOWARD THE NORTHWEST OR 320 DEGREES AT 11 KT ESTIMATED MINIMUM CENTRAL PRESSURE 937 MB EYE DIAMETER 20 NM MAX SUSTAINED WINDS 125 KT WITH GUSTS TO 150 KT. 64 KT....... 50NE 40SE 35SW 40NW. 50 KT....... 80NE 70SE 50SW 60NW. 34 KT.......130NE 120SE 90SW 110NW. 12 FT SEAS..210NE 150SE 150SW 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 22.6N 60.0W AT 30/1500Z AT 30/1200Z CENTER WAS LOCATED NEAR 22.1N 59.5W FORECAST VALID 01/0000Z 24.4N 60.8W MAX WIND 130 KT...GUSTS 160 KT. 64 KT... 50NE 45SE 35SW 45NW. 50 KT... 90NE 70SE 60SW 70NW. 34 KT...130NE 130SE 90SW 110NW. FORECAST VALID 01/1200Z 27.2N 61.7W MAX WIND 125 KT...GUSTS 150 KT. 64 KT... 50NE 45SE 35SW 45NW. 50 KT... 90NE 70SE 60SW 70NW. 34 KT...140NE 140SE 100SW 110NW. FORECAST VALID 02/0000Z 30.2N 61.6W MAX WIND 115 KT...GUSTS 140 KT. 64 KT... 50NE 45SE 40SW 45NW. 50 KT... 90NE 70SE 60SW 70NW. 34 KT...140NE 140SE 100SW 110NW. FORECAST VALID 02/1200Z 32.7N 60.8W MAX WIND 105 KT...GUSTS 130 KT. 64 KT... 50NE 50SE 40SW 40NW. 50 KT... 90NE 90SE 60SW 70NW. 34 KT...150NE 160SE 130SW 140NW. FORECAST VALID 03/0000Z 34.9N 59.2W MAX WIND 95 KT...GUSTS 115 KT. 50 KT... 80NE 80SE 60SW 70NW. 34 KT...160NE 180SE 130SW 150NW. FORECAST VALID 03/1200Z 36.9N 57.0W MAX WIND 90 KT...GUSTS 110 KT. 50 KT... 80NE 80SE 70SW 80NW. 34 KT...160NE 180SE 140SW 160NW. 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 04/1200Z 40.0N 51.0W MAX WIND 80 KT...GUSTS 100 KT. OUTLOOK VALID 05/1200Z 44.5N 45.5W...POST-TROP/EXTRATROP MAX WIND 65 KT...GUSTS 80 KT. REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 22.6N 60.0W INTERMEDIATE PUBLIC ADVISORY...WTNT33 KNHC/MIATCPAT3...AT 30/1800Z NEXT ADVISORY AT 30/2100Z $$ FORECASTER PASCH

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Tropical Storm Victor Forecast Discussion Number 5

2021-09-30 16:54:32| National Hurricane Center (Atlantic)

Issued at 200 PM CVT Thu Sep 30 2021 000 WTNT45 KNHC 301454 TCDAT5 Tropical Storm Victor Discussion Number 5 NWS National Hurricane Center Miami FL AL202021 200 PM CVT Thu Sep 30 2021 Victor remains a sprawling tropical storm with numerous curved bands surrounding the center. The associated convection remains most organized on the storm's west side. The latest Dvorak estimates are largely unchanged and range from 35 to 45 kt. In addition, an ASCAT-B pass from around 12Z showed maximum winds in the 35-40 kt range. Based on all of this data, the initial intensity is held at 40 kt. The ASCAT data also showed that the wind field is quite broad with tropical-storm-force winds extending about 90 n mi north of the center. Victor is still moving west-northwestward, or 290 degrees, at 12 kt. The storm is forecast to continue on that same general track for another day or so as it remains on the south side of a deep-layer ridge over the subtropical eastern Atlantic. By late Friday, a mid- to upper-level low is expected to form over the central Atlantic, and that feature should erode the western portion of the ridge. As a result, Victor is expected to turn northwestward by the weekend and then northward early next week when it is forecast to move in the flow between the ridge and the low. The model tracks have converged compared to yesterday, but the ECMWF remains the slowest and westernmost solution and the HWRF is still the easternmost model. The NHC track forecast is nudged to the west of the previous one and lies close to the various consensus aids and is in fair agreement with the GFS. The storm has about another 36 hours in conducive environmental conditions of very low wind shear, a moist mid-level airmass, and warm 28-29 degree C SSTs. Therefore, intensification seems likely during that time period, but given the broad nature of the system's wind field, Victor will likely gain strength slowly during that time period. However, in a couple of days, the models show a significant increase in southwesterly shear and a progressively drier airmass. These negative factors for the storm along with slightly cooler SSTs should cause Victor to lose strength. In fact, some of the models suggest that Victor could dissipate by the end of the forecast period. The new NHC intensity forecast is a little lower than the previous one. It should be noted that although this forecast no longer explicitly shows Victor becoming a hurricane, it could occur in a day or two before conditions become hostile. This forecast lies near the high end of the model guidance. FORECAST POSITIONS AND MAX WINDS INIT 30/1500Z 9.5N 28.9W 40 KT 45 MPH 12H 01/0000Z 10.2N 30.4W 50 KT 60 MPH 24H 01/1200Z 11.1N 32.3W 60 KT 70 MPH 36H 02/0000Z 12.4N 34.0W 60 KT 70 MPH 48H 02/1200Z 13.9N 35.5W 55 KT 65 MPH 60H 03/0000Z 15.7N 37.2W 50 KT 60 MPH 72H 03/1200Z 17.9N 39.0W 45 KT 50 MPH 96H 04/1200Z 23.2N 41.8W 35 KT 40 MPH 120H 05/1200Z 28.0N 42.4W 30 KT 35 MPH $$ Forecaster Cangialosi

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Tropical Storm Victor Forecast Advisory Number 5

2021-09-30 16:51:34| National Hurricane Center (Atlantic)

Issued at 1500 UTC THU SEP 30 2021 000 WTNT25 KNHC 301451 TCMAT5 TROPICAL STORM VICTOR FORECAST/ADVISORY NUMBER 5 NWS NATIONAL HURRICANE CENTER MIAMI FL AL202021 1500 UTC THU SEP 30 2021 THERE ARE NO COASTAL WATCHES OR WARNINGS IN EFFECT. TROPICAL STORM CENTER LOCATED NEAR 9.5N 28.9W AT 30/1500Z POSITION ACCURATE WITHIN 30 NM PRESENT MOVEMENT TOWARD THE WEST-NORTHWEST OR 290 DEGREES AT 12 KT ESTIMATED MINIMUM CENTRAL PRESSURE 1004 MB MAX SUSTAINED WINDS 40 KT WITH GUSTS TO 50 KT. 34 KT....... 90NE 0SE 0SW 90NW. 12 FT SEAS..150NE 105SE 0SW 60NW. 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 9.5N 28.9W AT 30/1500Z AT 30/1200Z CENTER WAS LOCATED NEAR 9.2N 28.4W FORECAST VALID 01/0000Z 10.2N 30.4W MAX WIND 50 KT...GUSTS 60 KT. 50 KT... 30NE 0SE 0SW 0NW. 34 KT...110NE 60SE 30SW 100NW. FORECAST VALID 01/1200Z 11.1N 32.3W MAX WIND 60 KT...GUSTS 75 KT. 50 KT... 30NE 0SE 0SW 30NW. 34 KT...110NE 70SE 50SW 100NW. FORECAST VALID 02/0000Z 12.4N 34.0W MAX WIND 60 KT...GUSTS 75 KT. 50 KT... 40NE 0SE 0SW 30NW. 34 KT...110NE 70SE 50SW 80NW. FORECAST VALID 02/1200Z 13.9N 35.5W MAX WIND 55 KT...GUSTS 65 KT. 50 KT... 30NE 0SE 0SW 20NW. 34 KT...100NE 60SE 40SW 70NW. FORECAST VALID 03/0000Z 15.7N 37.2W MAX WIND 50 KT...GUSTS 60 KT. 50 KT... 30NE 0SE 0SW 0NW. 34 KT... 80NE 70SE 30SW 60NW. FORECAST VALID 03/1200Z 17.9N 39.0W MAX WIND 45 KT...GUSTS 55 KT. 34 KT... 70NE 70SE 30SW 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 04/1200Z 23.2N 41.8W MAX WIND 35 KT...GUSTS 45 KT. OUTLOOK VALID 05/1200Z 28.0N 42.4W MAX WIND 30 KT...GUSTS 40 KT. REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 9.5N 28.9W NEXT ADVISORY AT 30/2100Z $$ FORECASTER CANGIALOSI

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Hurricane Sam Forecast Discussion Number 31

2021-09-30 10:56:25| National Hurricane Center (Atlantic)

Issued at 500 AM AST Thu Sep 30 2021 113 WTNT43 KNHC 300856 TCDAT3 Hurricane Sam Discussion Number 31 NWS National Hurricane Center Miami FL AL182021 500 AM AST Thu Sep 30 2021 Sam is a very impressive hurricane in infrared satellite imagery this morning. The 25-nm-wide eye remains very distinct and is surrounded by a ring of convection with cloud tops around -65C. The outflow is also well established in all quadrants. An Air Force Reserve Hurricane Hunter aircraft that performed three eyewall penetrations overnight has reported peak 700-mb flight-level winds of 139 kt in the northeastern, southeastern, and eastern eyewall, and peak SFMR surface winds of 119 kt. These data still support an initial wind speed of 125 kt. Sam's minimum pressure has fallen a few millibars since the NOAA aircraft mission last evening. The latest estimated pressure from dropsonde data gathered by the Air Force is 937 mb. NOAA buoy 41044 has recently reported a peak one-minute wind of 68 kt with a gust to 86 kt in the northeastern eyewall of Sam. The buoy has also reported peak seas of 40 ft. Sam could still strengthen a little today as it continues to move over a warm ocean eddy and remains in low vertical wind shear conditions. After that time, difficult-to-predict eyewall cycles however, could cause some fluctuations in intensity. After 48 hours, gradually decreasing SSTs and ocean heat content are likely to cause a more definitive weakening trend, with a faster rate of weakening likely after day 3. Sam is forecast to complete its extratropical transition by day 5, and it is predicted by the global model guidance to become a large and powerful extratropical low over the north Atlantic. Sam is moving northwestward or 320/10 kt. The track forecast reasoning is again unchanged from the previous advisory. Sam will move northwestward, and then northward around the western portion of a subtropical ridge during the next 48 hours. After that time, Sam is predicted to turn northeastward between the ridge and a large mid-latitude trough over the northeastern United States. As that trough lifts northeastward by day 3, Sam is forecast to continue on a northeastward heading, but it is not likely to accelerate as much as a typical recurving tropical cyclone over the north-central Atlantic. The dynamical model guidance remains in excellent agreement through 72 hours, but there is increasing spread after that time. The latest runs of the GFS and ECMWF models have come into somewhat better agreement at days 3 through 5, and the NHC track forecast is near the consensus of those typically reliable models. Although the core of Sam is forecast to pass east of Bermuda early Saturday, the tropical-storm-force wind field is forecast to expand and could pass very close to the island beginning late Friday night or early Saturday. Therefore, the Bermuda Weather Service has issued a Tropical Storm Watch for Bermuda. Key Messages: 1. Swells generated by Sam will impact the Northern Leeward Islands and the Greater Antilles, including Puerto Rico, during the next few days. Swells are expected to reach Bermuda and the Bahamas by Friday, and then spread to the United States east coast by this weekend. These swells could cause life-threatening surf and rip current conditions. Please consult products from your local weather office. 2. Tropical storm conditions are possible on Bermuda beginning Friday night or early Saturday, and a Tropical Storm Watch has been issued for that island. FORECAST POSITIONS AND MAX WINDS INIT 30/0900Z 21.5N 59.1W 125 KT 145 MPH 12H 30/1800Z 23.0N 60.2W 130 KT 150 MPH 24H 01/0600Z 25.6N 61.4W 125 KT 145 MPH 36H 01/1800Z 28.4N 61.8W 120 KT 140 MPH 48H 02/0600Z 31.1N 61.3W 115 KT 130 MPH 60H 02/1800Z 33.5N 59.9W 105 KT 120 MPH 72H 03/0600Z 35.5N 58.0W 95 KT 110 MPH 96H 04/0600Z 38.7N 52.6W 80 KT 90 MPH 120H 05/0600Z 44.3N 45.0W 65 KT 75 MPH...POST-TROP/EXTRATROP $$ Forecaster Brown

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Hurricane Sam Forecast Advisory Number 31

2021-09-30 10:53:56| National Hurricane Center (Atlantic)

Issued at 0900 UTC THU SEP 30 2021 000 WTNT23 KNHC 300853 TCMAT3 HURRICANE SAM FORECAST/ADVISORY NUMBER 31 NWS NATIONAL HURRICANE CENTER MIAMI FL AL182021 0900 UTC THU SEP 30 2021 CHANGES IN WATCHES AND WARNINGS WITH THIS ADVISORY... THE BERMUDA WEATHER SERVICE HAS ISSUED A TROPICAL STORM WATCH FOR BERMUDA. SUMMARY OF WATCHES AND WARNINGS IN EFFECT... A TROPICAL STORM WATCH IS IN EFFECT FOR... * BERMUDA A TROPICAL STORM WATCH MEANS THAT TROPICAL STORM CONDITIONS ARE POSSIBLE WITHIN THE WATCH AREA...GENERALLY WITHIN 48 HOURS. HURRICANE CENTER LOCATED NEAR 21.5N 59.1W AT 30/0900Z POSITION ACCURATE WITHIN 15 NM PRESENT MOVEMENT TOWARD THE NORTHWEST OR 320 DEGREES AT 10 KT ESTIMATED MINIMUM CENTRAL PRESSURE 937 MB MAX SUSTAINED WINDS 125 KT WITH GUSTS TO 150 KT. 64 KT....... 50NE 40SE 35SW 40NW. 50 KT....... 80NE 70SE 50SW 60NW. 34 KT.......130NE 120SE 90SW 110NW. 12 FT SEAS..180NE 150SE 150SW 150NW. 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 21.5N 59.1W AT 30/0900Z AT 30/0600Z CENTER WAS LOCATED NEAR 21.0N 58.8W FORECAST VALID 30/1800Z 23.0N 60.2W MAX WIND 130 KT...GUSTS 160 KT. 64 KT... 50NE 45SE 35SW 45NW. 50 KT... 90NE 70SE 60SW 70NW. 34 KT...130NE 120SE 90SW 110NW. FORECAST VALID 01/0600Z 25.6N 61.4W MAX WIND 125 KT...GUSTS 150 KT. 64 KT... 50NE 45SE 35SW 45NW. 50 KT... 90NE 70SE 60SW 70NW. 34 KT...130NE 130SE 90SW 110NW. FORECAST VALID 01/1800Z 28.4N 61.8W MAX WIND 120 KT...GUSTS 145 KT. 64 KT... 50NE 45SE 40SW 45NW. 50 KT... 80NE 70SE 60SW 70NW. 34 KT...140NE 140SE 100SW 110NW. FORECAST VALID 02/0600Z 31.1N 61.3W MAX WIND 115 KT...GUSTS 140 KT. 64 KT... 50NE 50SE 40SW 40NW. 50 KT... 80NE 80SE 60SW 70NW. 34 KT...150NE 150SE 120SW 120NW. FORECAST VALID 02/1800Z 33.5N 59.9W MAX WIND 105 KT...GUSTS 130 KT. 50 KT... 80NE 80SE 60SW 70NW. 34 KT...160NE 180SE 130SW 150NW. FORECAST VALID 03/0600Z 35.5N 58.0W MAX WIND 95 KT...GUSTS 115 KT. 50 KT... 80NE 80SE 70SW 80NW. 34 KT...160NE 180SE 140SW 160NW. 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 04/0600Z 38.7N 52.6W MAX WIND 80 KT...GUSTS 100 KT. OUTLOOK VALID 05/0600Z 44.3N 45.0W...POST-TROP/EXTRATROP MAX WIND 65 KT...GUSTS 80 KT. REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 21.5N 59.1W INTERMEDIATE PUBLIC ADVISORY...WTNT33 KNHC/MIATCPAT3...AT 30/1200Z NEXT ADVISORY AT 30/1500Z $$ FORECASTER BROWN

Tags: number sam advisory forecast

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