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Tropical Depression Twenty Forecast Discussion Number 7

2020-09-14 10:59:27| National Hurricane Center (Atlantic)

Issued at 500 AM AST Mon Sep 14 2020 000 WTNT45 KNHC 140859 TCDAT5 Tropical Storm Teddy Discussion Number 7 NWS National Hurricane Center Miami FL AL202020 500 AM AST Mon Sep 14 2020 Earlier ASCAT data indciated peak winds of 33 kt in the northwestern quadrant of the depression. Since then, convection has increased and so have the various satellite intensity estimates. The initial intensity is increased to 35 kt based on the ASCAT data, and satellite estimates of T3.5/35 kt from TAFB and 38 kt from UW-CIMSS SATCON. This makes Tropical Storm Teddy the earliest 19th named storm, besting the unnamed tropical storm on October 4, 2005. The initial motion estimate is 285/12 kt. A deep-layer subtropical ridge positioned over the central Atlantic should keep Teddy moving west-northwestward for the next couple of days. Thereafter, the ridge is expected to shift northward and eastward, and the strengthening cyclone is forecast to turn northwestward around the western periphery of the ridge. The latest NHC track guidance is general agreement on this developing track scenario, and the new official forecast track is similar to the previous one and lies down the middle of the guidance envelope, close to the consensus model tracks. Teddy will have several days to strengthen over very warm ocean temperatures and within a light vertical wind shear regime. The only hindrance to intensification will be intermittent intrusions of dry mid-level air that will briefly disrupt the inner-core convective structure. The NHC intensity forecast remains unchanged and brings Teddy major hurricane strength by the middle of the week. Some of the dynamical hurricane models continue to indicate that Teddy could strengthen faster than that, but I can't bear to make that forecast at this time. FORECAST POSITIONS AND MAX WINDS INIT 14/0900Z 13.4N 40.4W 35 KT 40 MPH 12H 14/1800Z 13.8N 42.4W 40 KT 45 MPH 24H 15/0600Z 14.3N 44.8W 50 KT 60 MPH 36H 15/1800Z 15.0N 46.7W 65 KT 75 MPH 48H 16/0600Z 15.9N 48.2W 75 KT 85 MPH 60H 16/1800Z 16.9N 49.5W 85 KT 100 MPH 72H 17/0600Z 18.3N 50.8W 95 KT 110 MPH 96H 18/0600Z 21.0N 53.1W 100 KT 115 MPH 120H 19/0600Z 23.9N 55.6W 100 KT 115 MPH $$ Forecaster Stewart

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Tropical Storm Sally Forecast Discussion Number 11

2020-09-14 10:55:57| National Hurricane Center (Atlantic)

Issued at 400 AM CDT Mon Sep 14 2020 000 WTNT44 KNHC 140855 TCDAT4 Tropical Storm Sally Discussion Number 11 NWS National Hurricane Center Miami FL AL192020 400 AM CDT Mon Sep 14 2020 The organization of Sally hasn't changed much during the past several hours. While there was a large burst of convection earlier, it did not translate into any intensification, with flight-level reconnaissance and SFMR surface winds still supporting an initial wind speed of 50 kt. The Air Force Reserve plane did find that the size of tropical-storm-force wind field has notable grown to the north and northwest of the center. The storm still has time to intensify under a seemingly conducive environment during the next 24-36 hours, before a combination of increasing westerly wind shear and land interaction will probably slow the intensification rate. Model guidance has come down slightly from 6 hours ago, but it has been inconsistent from cycle to cycle. The new intensity forecast is similar to the previous one and lies near the top end of the guidance envelope. The reconnaissance plane showed that Sally took a westward turn during the past several hours, but the storm appears to have a resumed a more west-northwestward motion recently. Weak ridging over the southern United States is expected to cause this general motion with a decrease in forward speed today before the storm slowly turns northward sometime on Tuesday due to an approaching trough. Guidance is not in good agreement on exactly when that turn occurs, causing a good deal of spread for a relatively short-range forecast. The track forecast has been shifted to the left in the short-term primarily due to the initial position, showing a track near or over extreme southeastern Louisiana, then is the near the previous one at its final landfall. The bottom line continues to be that Sally is expected to be a dangerous slow-moving hurricane near the coast of southeastern Louisiana, Mississippi and Alabama during the next 2-3 days. KEY MESSAGES: 1. It is too early to determine where Sally's center will move onshore given the uncertainty in the timing and location of Sally's northward turn near the central Gulf Coast. Users should not focus on the details of the official forecast track, since NHC's average forecast error at 48 hours is around 80 miles, and dangerous storm surge, rainfall, and wind hazards will extend well away from the center. 2. An extremely dangerous and life-threatening storm surge is expected for areas outside the southeastern Louisiana Hurricane and Storm Damage Risk Reduction System from Port Fourchon, Louisiana, to the Alabama/Florida border, where a Storm Surge Warning is in effect. Residents in these areas should follow any advice given by local officials. 3. Hurricane conditions are expected by late today within portions of the Hurricane Warning area from Morgan City, Louisiana, to the Mississippi/Alabama border, including Metropolitan New Orleans, with tropical storm conditions likely to begin by late this morning. Preparations should be rushed to completion in those areas. 4. Sally could continue to produce flash flooding across central and northern Florida and prolong existing minor river flooding across west-central Florida through today. Widespread significant flash flooding and minor to isolated major river flooding is likely across southeastern Louisiana, Mississippi, and Alabama through the middle of the week. Flooding impacts are expected to spread farther across the Southeast U.S. through the week. FORECAST POSITIONS AND MAX WINDS INIT 14/0900Z 28.3N 87.3W 50 KT 60 MPH 12H 14/1800Z 28.6N 88.1W 60 KT 70 MPH 24H 15/0600Z 29.1N 88.9W 70 KT 80 MPH 36H 15/1800Z 29.7N 89.3W 75 KT 85 MPH 48H 16/0600Z 30.6N 89.2W 60 KT 70 MPH...INLAND 60H 16/1800Z 31.6N 88.6W 30 KT 35 MPH...INLAND 72H 17/0600Z 32.5N 87.6W 25 KT 30 MPH...INLAND 96H 18/0600Z 33.5N 85.0W 20 KT 25 MPH...POST-TROP/REMNT LOW 120H 19/0600Z...DISSIPATED $$ Forecaster Blake

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Tropical Storm Sally Forecast Advisory Number 11

2020-09-14 10:52:58| National Hurricane Center (Atlantic)

Issued at 0900 UTC MON SEP 14 2020 000 WTNT24 KNHC 140852 TCMAT4 TROPICAL STORM SALLY FORECAST/ADVISORY NUMBER 11 NWS NATIONAL HURRICANE CENTER MIAMI FL AL192020 0900 UTC MON SEP 14 2020 CHANGES IN WATCHES AND WARNINGS WITH THIS ADVISORY... NONE. SUMMARY OF WATCHES AND WARNINGS IN EFFECT... A STORM SURGE WARNING IS IN EFFECT FOR... * PORT FOURCHON LOUISIANA TO THE ALABAMA/FLORIDA BORDER * LAKE PONTCHARTRAIN...LAKE MAUREPAS...AND LAKE BORGNE * MOBILE BAY A HURRICANE WARNING IS IN EFFECT FOR... * MORGAN CITY LOUISIANA TO THE MISSISSIPPI/ALABAMA BORDER * LAKE PONTCHARTRAIN AND LAKE MAUREPAS INCLUDING METROPOLITAN NEW ORLEANS A TROPICAL STORM WARNING IS IN EFFECT FOR... * MISSISSIPPI/ALABAMA BORDER TO INDIAN PASS FLORIDA * INTRACOASTAL CITY LOUISIANA TO WEST OF MORGAN CITY A HURRICANE WATCH IS IN EFFECT FOR... * MISSISSIPPI/ALABAMA BORDER TO THE ALABAMA/FLORIDA BORDER A TROPICAL STORM WATCH IS IN EFFECT FOR... * INDIAN PASS TO OCHLOCKONEE RIVER FLORIDA A STORM SURGE WARNING MEANS THERE IS A DANGER OF LIFE-THREATENING INUNDATION...FROM RISING WATER MOVING INLAND FROM THE COASTLINE...DURING THE NEXT 36 HOURS IN THE INDICATED LOCATIONS. FOR A DEPICTION OF AREAS AT RISK...PLEASE SEE THE NATIONAL WEATHER SERVICE STORM SURGE WATCH/WARNING GRAPHIC...AVAILABLE AT HURRICANES.GOV. THIS IS A LIFE-THREATENING SITUATION. PERSONS LOCATED WITHIN THESE AREAS SHOULD TAKE ALL NECESSARY ACTIONS TO PROTECT LIFE AND PROPERTY FROM RISING WATER AND THE POTENTIAL FOR OTHER DANGEROUS CONDITIONS. PROMPTLY FOLLOW EVACUATION AND OTHER INSTRUCTIONS FROM LOCAL OFFICIALS. A HURRICANE WARNING MEANS THAT HURRICANE CONDITIONS ARE EXPECTED SOMEWHERE WITHIN THE WARNING AREA. PREPARATIONS TO PROTECT LIFE AND PROPERTY SHOULD BE RUSHED TO COMPLETION. A TROPICAL STORM WARNING MEANS THAT TROPICAL STORM CONDITIONS ARE EXPECTED SOMEWHERE WITHIN THE WARNING AREA WITHIN 36 HOURS. A HURRICANE WATCH MEANS THAT HURRICANE CONDITIONS ARE POSSIBLE WITHIN THE WATCH AREA. A TROPICAL STORM WATCH MEANS THAT TROPICAL STORM CONDITIONS ARE POSSIBLE WITHIN THE WATCH AREA. TROPICAL STORM CENTER LOCATED NEAR 28.3N 87.3W AT 14/0900Z POSITION ACCURATE WITHIN 25 NM PRESENT MOVEMENT TOWARD THE WEST-NORTHWEST OR 285 DEGREES AT 8 KT ESTIMATED MINIMUM CENTRAL PRESSURE 996 MB MAX SUSTAINED WINDS 50 KT WITH GUSTS TO 60 KT. 50 KT....... 50NE 30SE 0SW 40NW. 34 KT.......110NE 110SE 20SW 100NW. 12 FT SEAS..120NE 90SE 60SW 100NW. 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 28.3N 87.3W AT 14/0900Z AT 14/0600Z CENTER WAS LOCATED NEAR 28.2N 86.9W FORECAST VALID 14/1800Z 28.6N 88.1W MAX WIND 60 KT...GUSTS 75 KT. 50 KT... 50NE 30SE 0SW 40NW. 34 KT...110NE 110SE 30SW 100NW. FORECAST VALID 15/0600Z 29.1N 88.9W MAX WIND 70 KT...GUSTS 85 KT. 64 KT... 20NE 15SE 0SW 15NW. 50 KT... 50NE 40SE 20SW 30NW. 34 KT...110NE 100SE 50SW 80NW. FORECAST VALID 15/1800Z 29.7N 89.3W MAX WIND 75 KT...GUSTS 90 KT. 64 KT... 20NE 15SE 10SW 15NW. 50 KT... 40NE 30SE 20SW 30NW. 34 KT... 90NE 90SE 50SW 60NW. FORECAST VALID 16/0600Z 30.6N 89.2W...INLAND MAX WIND 60 KT...GUSTS 75 KT. 50 KT... 30NE 30SE 10SW 10NW. 34 KT... 60NE 90SE 40SW 40NW. FORECAST VALID 16/1800Z 31.6N 88.6W...INLAND MAX WIND 30 KT...GUSTS 40 KT. FORECAST VALID 17/0600Z 32.5N 87.6W...INLAND MAX WIND 25 KT...GUSTS 35 KT. 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 18/0600Z 33.5N 85.0W...POST-TROP/REMNT LOW MAX WIND 20 KT...GUSTS 30 KT. OUTLOOK VALID 19/0600Z...DISSIPATED REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 28.3N 87.3W INTERMEDIATE PUBLIC ADVISORY...WTNT34 KNHC/MIATCPAT4...AT 14/1200Z NEXT ADVISORY AT 14/1500Z $$ FORECASTER BLAKE

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Hurricane Paulette Forecast Discussion Number 30

2020-09-14 10:51:23| National Hurricane Center (Atlantic)

Issued at 500 AM AST Mon Sep 14 2020 005 WTNT42 KNHC 140851 TCDAT2 Hurricane Paulette Discussion Number 30 NWS National Hurricane Center Miami FL AL172020 500 AM AST Mon Sep 14 2020 The large, 35-40-mile-wide eye of Paulette is located over northeastern Bermuda, and nearly the entire island is inside the eye. The last Air Force Reserve hurricane hunter mission measured peak 700-mb flight-level winds of 88 kt in the northeastern quadrant where data from satellites and the Bermuda radar (the radar is still functioning) indicate a large burst of deep convection has developed and persisted in that part of the eyewall, likely bringing down much of those winds to the surface. Using a standard 90-percent adjustment factor yields a surface wind estimate near 80 kt, and that is the intensity used for this advisory. The last reported pressure by the aircraft was 973 mb, which has been confirmed by surface observations from Bermuda. The initial motion estimate is 345/10 kt. The track, intensity, and wind radii forecasts remain essentially unchanged since all of the latest NHC guidance appears to be tightly dialed in on Paulette's future. Additional strengthening appears likely after Paulette moves away from Bermuda and accelerates northeastward over the North Atlantic. Paulette is expected to be at or near major hurricane strength on Tuesday. By the end of the forecast period, weakening is forecast as Paulette interacts with a mid-latitude trough and begins to lose its tropical characteristics. The NHC intensity forecast is remains just above the intensity consensus, but is within the tightly clustered guidance envelope at all times. Confidence in the track forecast also remains high, and the latest track guidance is tightly packed about the previous advisory track. Paulette will move northward away from Bermuda today, followed by a turn toward the northeast by tonight and on Tuesday. A slower eastward to southeastward motion is expected by Friday when a large mid-tropospheric cut-off low over the eastern Atlantic is forecast to begin influencing Paulette's track. Key Messages: 1. The eye of Paulette will gradually move away from Bermuda this morning, with hurricane conditions returning within a couple of hours. A prolonged period of strong winds, storm surge, and very heavy rainfall will likely continue into this afternoon. 2. Swells produced by Paulette are affecting portions of the Leeward Islands, the Greater Antilles, the Bahamas, Bermuda, and the east coast of the United States. These swells could cause life-threatening surf and rip current conditions. FORECAST POSITIONS AND MAX WINDS INIT 14/0900Z 32.3N 64.7W 80 KT 90 MPH 12H 14/1800Z 33.9N 64.4W 85 KT 100 MPH 24H 15/0600Z 36.1N 62.1W 95 KT 110 MPH 36H 15/1800Z 38.4N 57.6W 100 KT 115 MPH 48H 16/0600Z 40.9N 51.8W 95 KT 110 MPH 60H 16/1800Z 43.4N 45.3W 85 KT 100 MPH 72H 17/0600Z 45.3N 40.0W 75 KT 85 MPH 96H 18/0600Z 45.5N 36.3W 55 KT 65 MPH 120H 19/0600Z 41.6N 34.0W 45 KT 50 MPH...POST-TROP/EXTRATROP $$ Forecaster Stewart

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Hurricane Paulette Forecast Advisory Number 30

2020-09-14 10:50:22| National Hurricane Center (Atlantic)

Issued at 0900 UTC MON SEP 14 2020 178 WTNT22 KNHC 140850 TCMAT2 HURRICANE PAULETTE FORECAST/ADVISORY NUMBER 30 NWS NATIONAL HURRICANE CENTER MIAMI FL AL172020 0900 UTC MON SEP 14 2020 CHANGES IN WATCHES AND WARNINGS WITH THIS ADVISORY... NONE. SUMMARY OF WATCHES AND WARNINGS IN EFFECT... A HURRICANE WARNING IS IN EFFECT FOR... * BERMUDA A HURRICANE WARNING MEANS THAT HURRICANE CONDITIONS ARE OCCURRING ON BERMUDA OR WILL BEGIN AGAIN IN A COUPLE OF HOURS. HURRICANE CENTER LOCATED NEAR 32.3N 64.7W AT 14/0900Z POSITION ACCURATE WITHIN 15 NM PRESENT MOVEMENT TOWARD THE NORTH-NORTHWEST OR 345 DEGREES AT 10 KT ESTIMATED MINIMUM CENTRAL PRESSURE 973 MB EYE DIAMETER 35 NM MAX SUSTAINED WINDS 80 KT WITH GUSTS TO 100 KT. 64 KT....... 40NE 20SE 0SW 30NW. 50 KT....... 80NE 50SE 30SW 80NW. 34 KT.......150NE 100SE 80SW 150NW. 12 FT SEAS..360NE 210SE 270SW 300NW. 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 64.7W AT 14/0900Z AT 14/0600Z CENTER WAS LOCATED NEAR 31.8N 64.4W FORECAST VALID 14/1800Z 33.9N 64.4W MAX WIND 85 KT...GUSTS 105 KT. 64 KT... 40NE 30SE 20SW 40NW. 50 KT... 80NE 50SE 40SW 80NW. 34 KT...150NE 120SE 90SW 150NW. FORECAST VALID 15/0600Z 36.1N 62.1W MAX WIND 95 KT...GUSTS 115 KT. 64 KT... 40NE 40SE 30SW 40NW. 50 KT... 80NE 80SE 50SW 80NW. 34 KT...160NE 150SE 120SW 150NW. FORECAST VALID 15/1800Z 38.4N 57.6W MAX WIND 100 KT...GUSTS 120 KT. 64 KT... 50NE 50SE 35SW 50NW. 50 KT... 80NE 80SE 60SW 80NW. 34 KT...180NE 180SE 140SW 180NW. FORECAST VALID 16/0600Z 40.9N 51.8W MAX WIND 95 KT...GUSTS 115 KT. 64 KT... 50NE 50SE 40SW 50NW. 50 KT...100NE 100SE 80SW 100NW. 34 KT...200NE 200SE 150SW 200NW. FORECAST VALID 16/1800Z 43.4N 45.3W MAX WIND 85 KT...GUSTS 105 KT. 50 KT...100NE 100SE 90SW 100NW. 34 KT...200NE 220SE 170SW 200NW. FORECAST VALID 17/0600Z 45.3N 40.0W MAX WIND 75 KT...GUSTS 90 KT. 50 KT... 90NE 90SE 80SW 90NW. 34 KT...200NE 220SE 180SW 200NW. 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 18/0600Z 45.5N 36.3W MAX WIND 55 KT...GUSTS 65 KT. OUTLOOK VALID 19/0600Z 41.6N 34.0W...POST-TROP/EXTRATROP MAX WIND 45 KT...GUSTS 55 KT. REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 32.3N 64.7W INTERMEDIATE PUBLIC ADVISORY...WTNT32 KNHC/MIATCPAT2...AT 14/1200Z NEXT ADVISORY AT 14/1500Z $$ FORECASTER STEWART

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