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Hurricane Teddy Forecast Discussion Number 20

2020-09-17 10:54:10| National Hurricane Center (Atlantic)

Issued at 500 AM AST Thu Sep 17 2020 000 WTNT45 KNHC 170854 TCDAT5 Hurricane Teddy Discussion Number 20 NWS National Hurricane Center Miami FL AL202020 500 AM AST Thu Sep 17 2020 Several passive microwave overpasses have revealed that Teddy has developed a 25-nmi-wide closed eye, while GOES-16 infrared satellite data shows significant cooling of the cloud tops surrounding a ragged eye feature. As a result, satellite intensity estimates have increased, thus Teddy's intensity has been increased to 90 kt based on a Dvorak classification of T5.0/90 kt from SAB and a recent UW-CIMSS adjusted-ADT value of T5.7/105 kt. The initial motion estimate based on the microwave satellite fixes is 305/10 kt. As described in previous discussions, 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 runs, and this difference remains related timing differences on 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 close to the previous advisory track now that it appears that the models have settled down, and lies close to the consensus models TVCA, HCCA, and FSSE. The overall environmental conditions appear to be conducive for Teddy to continue to at least gradually strengthen for the next 36-48 hours. However, with sea-surface temperatures expected to be near 30 deg C in 48-72 hours when the vertical shear is going to be near zero, the intensity forecast at that time could be too low. For now, the official intensity forecast lies near the upper end of the guidance envelope, and shows Teddy's intensity leveling off after 36 hours due to the very dry environment that the hurricane will be moving through, which could disrupt the inner-core convective pattern and eye feature. FORECAST POSITIONS AND MAX WINDS INIT 17/0900Z 18.3N 52.3W 90 KT 105 MPH 12H 17/1800Z 19.5N 53.5W 90 KT 105 MPH 24H 18/0600Z 20.9N 54.9W 100 KT 115 MPH 36H 18/1800Z 22.5N 56.5W 105 KT 120 MPH 48H 19/0600Z 24.3N 58.2W 105 KT 120 MPH 60H 19/1800Z 26.1N 60.2W 100 KT 115 MPH 72H 20/0600Z 27.6N 62.0W 100 KT 115 MPH 96H 21/0600Z 30.7N 64.0W 95 KT 110 MPH 120H 22/0600Z 36.0N 62.9W 90 KT 105 MPH $$ Forecaster Stewart

Tags: number discussion forecast hurricane

Hurricane Teddy Forecast Advisory Number 20

2020-09-17 10:48:11| National Hurricane Center (Atlantic)

Issued at 0900 UTC THU SEP 17 2020 000 WTNT25 KNHC 170848 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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Tropical Storm Vicky Forecast Discussion Number 13

2020-09-17 10:33:41| National Hurricane Center (Atlantic)

Issued at 500 AM AST Thu Sep 17 2020 000 WTNT41 KNHC 170833 TCDAT1 Tropical Storm Vicky Discussion Number 13 NWS National Hurricane Center Miami FL AL212020 500 AM AST Thu Sep 17 2020 Strong upper-level westerly winds associated with the outflow of Hurricane Teddy continues to rip across the circulation of Vicky. These very hostile winds aloft are causing Vicky to struggle with maintaining deep convection, which is quite sheared and limited to the northeastern quadrant. The latest satellite intensity estimates range from 25 to 38 kt, and the initial intensity is held at a possibly generous 35 kt. Since the shear is expected to remain strong, Vicky is forecast to weaken to a tropical depression later today, a remnant low by tonight, and dissipate entirely by the weekend. The weak storm is moving west-northwestward at 6 kt. A turn to the west is expected later today, followed by a west-southwest motion after that until the cyclone dissipates in a couple of days. The track forecast lies near the various consensus aids. FORECAST POSITIONS AND MAX WINDS INIT 17/0900Z 21.9N 36.7W 35 KT 40 MPH 12H 17/1800Z 21.6N 38.0W 30 KT 35 MPH 24H 18/0600Z 21.0N 39.8W 25 KT 30 MPH...POST-TROP/REMNT LOW 36H 18/1800Z 20.2N 41.5W 25 KT 30 MPH...POST-TROP/REMNT LOW 48H 19/0600Z 19.4N 43.2W 20 KT 25 MPH...POST-TROP/REMNT LOW 60H 19/1800Z...DISSIPATED $$ Forecaster Cangialosi

Tags: number discussion storm tropical

Tropical Storm Vicky Forecast Advisory Number 13

2020-09-17 10:33:15| National Hurricane Center (Atlantic)

Issued at 0900 UTC THU SEP 17 2020 000 WTNT21 KNHC 170833 TCMAT1 TROPICAL STORM VICKY FORECAST/ADVISORY NUMBER 13 NWS NATIONAL HURRICANE CENTER MIAMI FL AL212020 0900 UTC THU SEP 17 2020 THERE ARE NO COASTAL WATCHES OR WARNINGS IN EFFECT. TROPICAL STORM CENTER LOCATED NEAR 21.9N 36.7W AT 17/0900Z POSITION ACCURATE WITHIN 30 NM PRESENT MOVEMENT TOWARD THE WEST-NORTHWEST OR 285 DEGREES AT 6 KT ESTIMATED MINIMUM CENTRAL PRESSURE 1008 MB MAX SUSTAINED WINDS 35 KT WITH GUSTS TO 45 KT. 34 KT....... 30NE 0SE 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 21.9N 36.7W AT 17/0900Z AT 17/0600Z CENTER WAS LOCATED NEAR 21.8N 36.2W FORECAST VALID 17/1800Z 21.6N 38.0W MAX WIND 30 KT...GUSTS 40 KT. FORECAST VALID 18/0600Z 21.0N 39.8W...POST-TROP/REMNT LOW MAX WIND 25 KT...GUSTS 35 KT. FORECAST VALID 18/1800Z 20.2N 41.5W...POST-TROP/REMNT LOW MAX WIND 25 KT...GUSTS 35 KT. FORECAST VALID 19/0600Z 19.4N 43.2W...POST-TROP/REMNT LOW MAX WIND 20 KT...GUSTS 30 KT. FORECAST VALID 19/1800Z...DISSIPATED REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 21.9N 36.7W NEXT ADVISORY AT 17/1500Z $$ FORECASTER CANGIALOSI

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Tropical Depression Sally Forecast Discussion Number 25

2020-09-17 10:31:43| National Hurricane Center (Atlantic)

Issued at 400 AM CDT Thu Sep 17 2020 000 WTNT44 KNHC 170831 TCDAT4 Tropical Depression Sally Discussion Number 25 NWS National Hurricane Center Miami FL AL192020 400 AM CDT Thu Sep 17 2020 Although the overall convective cloud and rain shield in satellite and radar imagery continues to erode, Tropical Depression Sally is still producing significant rainfall across east-central Alabama and west-central and central Georgia. Surface observations and Doppler radar data indicate that Sally has weakened to a 25-kt depression over southeastern Alabama. Sally will continue to weaken, and fairly rapidly at that, due to increasing friction and loss of convection owing to very hostile westerly to southwesterly vertical wind shear in excess of 40 kt. Sally will likely degenerate into a remnant low pressure system by tonight or early Friday, and merge with a frontal system over North Carolina by Friday evening. Sally is moving northeastward or 055/10 kt. A northeastward to east-northeastward motion will continue for the next 36 hours or so as the cyclone moves ahead of a broad deep-layer trough over the northeastern United States. The official track forecast is down the middle of the tightly packed NHC model guidance suite, and lies close to the previous advisory track and the consensus model HCCA. This is the last NHC advisory on Sally. Future information on this system, including the rainfall threat, can be found in Public Advisories issued by the Weather Prediction Center beginning at 10 AM CDT, under AWIPS header TCPAT3, WMO header WTNT34 KWNH, and on the web at http://www.wpc.ncep.noaa.gov KEY MESSAGES: 1. Widespread flooding is expected from central Georgia through southeastern Virginia. Along the central Gulf Coast, most widespread moderate to major river flooding from the historic rainfall event will crest by the weekend, but rivers will remain elevated well into next week. FORECAST POSITIONS AND MAX WINDS INIT 17/0900Z 31.8N 85.7W 25 KT 30 MPH...INLAND 12H 17/1800Z 32.8N 84.2W 25 KT 30 MPH...INLAND 24H 18/0600Z 34.0N 81.3W 20 KT 25 MPH...POST-TROP/REMNT LOW 36H 18/1800Z 35.1N 78.4W 20 KT 25 MPH...POST-TROP/REMNT LOW 48H 19/0600Z...MERGED WITH FRONTAL SYSTEM $$ Forecaster Stewart

Tags: number discussion tropical depression

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