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Hurricane Teddy Forecast Discussion Number 21

2020-09-17 17:03:23| National Hurricane Center (Atlantic)

Issued at 1100 AM AST Thu Sep 17 2020 000 WTNT45 KNHC 171502 CCA TCDAT5 Hurricane Teddy Discussion Number 21...Corrected NWS National Hurricane Center Miami FL AL202020 1100 AM AST Thu Sep 17 2020 Corrected to add Key Messages Since the previous advisory, Teddy's satellite appearance has steadily improved. There is now a ragged warming eye surrounded by a ring of convection with cloud tops colder than -60 degrees C. Very recently the objective satellite intensity estimates from UW-CIMSS have been rapidly increasing. And although a blend of the 1130 and 1200 UTC Dvorak intensity estimates from SAB and TAFB, respectively, averaged out to an intensity of about 95 kt, the improved satellite presentation since that time suggests that the hurricane should have winds of at least 105 kt, which is the initial intensity for this advisory, which could even be a little conservative based on the latest UW-CIMMS ADT and SATCON values of 120 and 111 kt, respectively. There will be NOAA and Air Force Reserve Hurricane Hunter aircraft inside Teddy later today, which should provide much more detail on the structure and intensity of Teddy. The only negative factor for intensification during the next 24 h is about 10 to 15 kt of vertical wind shear. However, Teddy has been able to begin the latest burst of intensification despite that shear. Therefore additional strengthening is anticipated through this evening, and Teddy is forecast to become a category 4 hurricane by tonight. The overall environment does not change significantly for the next couple of days, so other than some fluctuations intensity such as due to potential eyewall replacement cycles, no change in strength is indicated during that time. As Teddy continues moving northwest over the weekend, it is likely to begin to encounter some of the cooler waters upwelled by Hurricane Paulette last week. This could cause the cyclone to slowly weaken. By late this weekend, increasing vertical wind shear should also contribute to weakening. Due to the fast increase in intensity this morning, the latest NHC intensity is a bit higher than all of the guidance for the first 48 h, but the overall intensity trends are closely mirrored by the various multi-model consensus. Beyond 48 h, the NHC forecast closely follows the LGEM guidance. Teddy continues to move northwestward at 10 kt. The track forecast and reasoning both remain straightforward and unchanged for the next 72 h. The latest NHC model guidance is in excellent agreement that a deep-layer ridge situated over the central Atlantic will force Teddy on a northwestward track toward the western Atlantic. There is a little less divergence among the models on days 4 and 5 then on previous cycles, and these differences are due to timing differences in where and how fast the hurricane begins to recurve ahead of an approaching mid-latitude trough and frontal system moving off the coast of the eastern United States in about 3 days. The new NHC track forecast is little changed from the previous one, and is in the middle of the tightly clustered track guidance. On the forecast track, Teddy will make its closest approach to Bermuda on Monday. Key Messages: 1. Teddy is expected to approach Bermuda as a hurricane this weekend and make its closest approach to the island late Sunday or Monday. While the exact details of Teddy's track and intensity near the island are not yet known, the risk of strong winds, storm surge, and heavy rainfall on Bermuda is increasing. 2. Swells produced by Teddy are expected to affect portions of the Leeward Islands, the Greater Antilles, the Bahamas, Bermuda, and the southeastern United States late this week and into the weekend. These swells could cause life-threatening surf and rip current conditions. FORECAST POSITIONS AND MAX WINDS INIT 17/1500Z 19.3N 53.0W 105 KT 120 MPH 12H 18/0000Z 20.4N 54.0W 115 KT 130 MPH 24H 18/1200Z 21.8N 55.5W 115 KT 130 MPH 36H 19/0000Z 23.5N 57.0W 115 KT 130 MPH 48H 19/1200Z 25.5N 58.9W 110 KT 125 MPH 60H 20/0000Z 27.3N 60.9W 105 KT 120 MPH 72H 20/1200Z 28.7N 62.7W 100 KT 115 MPH 96H 21/1200Z 32.4N 63.4W 95 KT 110 MPH 120H 22/1200Z 38.9N 62.3W 85 KT 100 MPH $$ Forecaster Latto

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Hurricane Teddy Forecast Advisory Number 21

2020-09-17 16:55:56| National Hurricane Center (Atlantic)

Issued at 1500 UTC THU SEP 17 2020 000 WTNT25 KNHC 171455 TCMAT5 HURRICANE TEDDY FORECAST/ADVISORY NUMBER 21 NWS NATIONAL HURRICANE CENTER MIAMI FL AL202020 1500 UTC THU SEP 17 2020 THERE ARE NO COASTAL WATCHES OR WARNINGS IN EFFECT. HURRICANE CENTER LOCATED NEAR 19.3N 53.0W AT 17/1500Z POSITION ACCURATE WITHIN 20 NM PRESENT MOVEMENT TOWARD THE NORTHWEST OR 325 DEGREES AT 10 KT ESTIMATED MINIMUM CENTRAL PRESSURE 957 MB MAX SUSTAINED WINDS 105 KT WITH GUSTS TO 130 KT. 64 KT....... 30NE 25SE 20SW 30NW. 50 KT....... 60NE 50SE 50SW 70NW. 34 KT.......220NE 100SE 80SW 170NW. 12 FT SEAS..330NE 330SE 300SW 360NW. 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 19.3N 53.0W AT 17/1500Z AT 17/1200Z CENTER WAS LOCATED NEAR 18.9N 52.7W FORECAST VALID 18/0000Z 20.4N 54.0W MAX WIND 115 KT...GUSTS 140 KT. 64 KT... 35NE 30SE 25SW 35NW. 50 KT... 70NE 60SE 50SW 70NW. 34 KT...200NE 120SE 90SW 160NW. FORECAST VALID 18/1200Z 21.8N 55.5W MAX WIND 115 KT...GUSTS 140 KT. 64 KT... 45NE 35SE 25SW 45NW. 50 KT... 80NE 70SE 50SW 70NW. 34 KT...190NE 130SE 100SW 150NW. FORECAST VALID 19/0000Z 23.5N 57.0W MAX WIND 115 KT...GUSTS 140 KT. 64 KT... 45NE 40SE 30SW 45NW. 50 KT... 90NE 80SE 60SW 70NW. 34 KT...190NE 150SE 110SW 150NW. FORECAST VALID 19/1200Z 25.5N 58.9W MAX WIND 110 KT...GUSTS 135 KT. 64 KT... 50NE 45SE 35SW 45NW. 50 KT...100NE 90SE 70SW 90NW. 34 KT...190NE 160SE 120SW 160NW. FORECAST VALID 20/0000Z 27.3N 60.9W MAX WIND 105 KT...GUSTS 130 KT. 50 KT...100NE 90SE 70SW 80NW. 34 KT...190NE 170SE 120SW 160NW. FORECAST VALID 20/1200Z 28.7N 62.7W MAX WIND 100 KT...GUSTS 120 KT. 50 KT...100NE 90SE 70SW 80NW. 34 KT...190NE 170SE 130SW 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 21/1200Z 32.4N 63.4W MAX WIND 95 KT...GUSTS 115 KT. OUTLOOK VALID 22/1200Z 38.9N 62.3W MAX WIND 85 KT...GUSTS 105 KT. REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 19.3N 53.0W NEXT ADVISORY AT 17/2100Z $$ FORECASTER LATTO

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Tropical Depression Vicky Forecast Discussion Number 14

2020-09-17 16:40:00| National Hurricane Center (Atlantic)

Issued at 1100 AM AST Thu Sep 17 2020 000 WTNT41 KNHC 171439 TCDAT1 Tropical Depression Vicky Discussion Number 14 NWS National Hurricane Center Miami FL AL212020 1100 AM AST Thu Sep 17 2020 Vicky is feeling the affects of very strong upper-level winds associated with the outflow of Hurricane Teddy. These winds have caused the remaining convection to be stripped well away from the center, and recent ASCAT data indicates that Vicky has weakened to a tropical depression. The ASCAT data support a peak wind speed of 30 kt. Vertical wind shear of 40-50 kt is forecast to continue plaguing Vicky, and the cyclone should continue to weaken and become a remnant low later today. The global models indicate that the circulation will open up into a trough within 36 to 48 hours, and the official forecast calls for dissipation within that time period. Now that Vicky has become a vertically shallow cyclone, it has turned south of due west and is moving 260/12 kt. Vicky or its remnants should turn west-southwestward later today as it is steered by the low-level northeasterly flow. The latest NHC track forecast is in best agreement with the HFIP corrected consensus model. FORECAST POSITIONS AND MAX WINDS INIT 17/1500Z 21.4N 38.2W 30 KT 35 MPH 12H 18/0000Z 21.0N 39.6W 25 KT 30 MPH...POST-TROP/REMNT LOW 24H 18/1200Z 20.4N 41.3W 25 KT 30 MPH...POST-TROP/REMNT LOW 36H 19/0000Z 19.6N 43.0W 20 KT 25 MPH...POST-TROP/REMNT LOW 48H 19/1200Z...DISSIPATED $$ Forecaster Brown

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Tropical Depression Vicky Forecast Advisory Number 14

2020-09-17 16:38:49| National Hurricane Center (Atlantic)

Issued at 1500 UTC THU SEP 17 2020 000 WTNT21 KNHC 171438 TCMAT1 TROPICAL DEPRESSION VICKY FORECAST/ADVISORY NUMBER 14 NWS NATIONAL HURRICANE CENTER MIAMI FL AL212020 1500 UTC THU SEP 17 2020 THERE ARE NO COASTAL WATCHES OR WARNINGS IN EFFECT. TROPICAL DEPRESSION CENTER LOCATED NEAR 21.4N 38.2W AT 17/1500Z POSITION ACCURATE WITHIN 25 NM PRESENT MOVEMENT TOWARD THE WEST OR 260 DEGREES AT 12 KT ESTIMATED MINIMUM CENTRAL PRESSURE 1008 MB MAX SUSTAINED WINDS 30 KT WITH GUSTS TO 40 KT. 12 FT SEAS.. 60NE 0SE 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 21.4N 38.2W AT 17/1500Z AT 17/1200Z CENTER WAS LOCATED NEAR 21.5N 37.7W FORECAST VALID 18/0000Z 21.0N 39.6W...POST-TROP/REMNT LOW MAX WIND 25 KT...GUSTS 35 KT. FORECAST VALID 18/1200Z 20.4N 41.3W...POST-TROP/REMNT LOW MAX WIND 25 KT...GUSTS 35 KT. FORECAST VALID 19/0000Z 19.6N 43.0W...POST-TROP/REMNT LOW MAX WIND 20 KT...GUSTS 30 KT. FORECAST VALID 19/1200Z...DISSIPATED REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 21.4N 38.2W NEXT ADVISORY AT 17/2100Z $$ FORECASTER BROWN

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Hurricane Teddy Forecast Advisory Number 20

2020-09-17 13:30:11| National Hurricane Center (Atlantic)

Issued at 0900 UTC THU SEP 17 2020 000 WTNT25 KNHC 171130 RRA TCMAT5 HURRICANE TEDDY FORECAST/ADVISORY NUMBER 20 NWS NATIONAL HURRICANE CENTER MIAMI FL AL202020 0900 UTC THU SEP 17 2020 THERE ARE NO COASTAL WATCHES OR WARNINGS IN EFFECT. HURRICANE CENTER LOCATED NEAR 18.3N 52.3W AT 17/0900Z POSITION ACCURATE WITHIN 20 NM PRESENT MOVEMENT TOWARD THE NORTHWEST OR 305 DEGREES AT 10 KT ESTIMATED MINIMUM CENTRAL PRESSURE 970 MB EYE DIAMETER 25 NM MAX SUSTAINED WINDS 90 KT WITH GUSTS TO 110 KT. 64 KT....... 30NE 25SE 20SW 30NW. 50 KT....... 60NE 50SE 50SW 70NW. 34 KT.......220NE 100SE 80SW 170NW. 12 FT SEAS..330NE 330SE 300SW 330NW. 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 18.3N 52.3W AT 17/0900Z AT 17/0600Z CENTER WAS LOCATED NEAR 18.0N 52.0W FORECAST VALID 17/1800Z 19.5N 53.5W MAX WIND 90 KT...GUSTS 110 KT. 64 KT... 35NE 30SE 25SW 35NW. 50 KT... 70NE 60SE 50SW 70NW. 34 KT...200NE 120SE 90SW 160NW. FORECAST VALID 18/0600Z 20.9N 54.9W MAX WIND 100 KT...GUSTS 120 KT. 64 KT... 45NE 35SE 25SW 45NW. 50 KT... 80NE 70SE 50SW 70NW. 34 KT...190NE 130SE 100SW 150NW. FORECAST VALID 18/1800Z 22.5N 56.5W MAX WIND 105 KT...GUSTS 130 KT. 64 KT... 45NE 40SE 30SW 45NW. 50 KT... 90NE 80SE 60SW 70NW. 34 KT...190NE 150SE 110SW 150NW. FORECAST VALID 19/0600Z 24.3N 58.2W MAX WIND 105 KT...GUSTS 130 KT. 64 KT... 50NE 45SE 35SW 45NW. 50 KT...100NE 90SE 70SW 90NW. 34 KT...190NE 160SE 120SW 160NW. FORECAST VALID 19/1800Z 26.1N 60.2W MAX WIND 100 KT...GUSTS 120 KT. 50 KT...100NE 90SE 70SW 80NW. 34 KT...190NE 170SE 120SW 160NW. FORECAST VALID 20/0600Z 27.6N 62.0W MAX WIND 100 KT...GUSTS 120 KT. 50 KT...100NE 90SE 70SW 80NW. 34 KT...190NE 170SE 130SW 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 21/0600Z 30.7N 64.0W MAX WIND 95 KT...GUSTS 115 KT. OUTLOOK VALID 22/0600Z 36.0N 62.9W MAX WIND 90 KT...GUSTS 110 KT. REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 18.3N 52.3W NEXT ADVISORY AT 17/1500Z $$ FORECASTER STEWART

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