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09-01-2019 01:25 AM - edited 09-01-2019 01:34 AM
000 WTNT35 KNHC 010252 TCPAT5 BULLETIN Hurricane Dorian Advisory Number 31 NWS National Hurricane Center Miami FL AL052019 1100 PM EDT Sat Aug 31 2019 ...EXTREMELY DANGEROUS HURRICANE DORIAN MOVING CLOSER TO THE NORTHWESTERN BAHAMAS... ...LIFE-THREATENING STORM SURGE...HURRICANE-FORCE WINDS...AND HEAVY RAINFALL EXPECTED OVER THE NORTHWESTERNMOST BAHAMAS... SUMMARY OF 1100 PM EDT...0300 UTC...INFORMATION ----------------------------------------------- LOCATION...26.3N 75.1W ABOUT 125 MI...200 KM E OF GREAT ABACO ISLAND ABOUT 310 MI...500 KM E OF WEST PALM BEACH FLORIDA MAXIMUM SUSTAINED WINDS...150 MPH...240 KM/H PRESENT MOVEMENT...W OR 280 DEGREES AT 8 MPH...13 KM/H MINIMUM CENTRAL PRESSURE...940 MB...27.76 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: None SUMMARY OF WATCHES AND WARNINGS IN EFFECT: A Hurricane Warning is in effect for... * Northwestern Bahamas excluding Andros Island A Hurricane Watch is in effect for... * Andros Island A Tropical Storm Watch is in effect for... * Deerfield Beach to Sebastian Inlet 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 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, generally within 48 hours. Interests elsewhere in southern and central Florida should continue to monitor the progress of Dorian. Additional watches may be required for portions of the east coast of Florida on Sunday. For storm information specific to your area in the United States, including possible inland watches and warnings, please monitor products issued by your local National Weather Service forecast office. For storm information specific to your area outside of the United States, please monitor products issued by your national meteorological service. DISCUSSION AND OUTLOOK ---------------------- At 1100 PM EDT (0300 UTC), the center of Hurricane Dorian was located near latitude 26.3 North, longitude 75.1 West. Dorian is moving toward the west near 8 mph (13 km/h), and a slower westward motion should continue for the next day or two, followed by a gradual turn toward the northwest. On this track, the core of Dorian should be near or over portions of the northwestern Bahamas on Sunday, and move closer to the Florida east coast late Monday through Tuesday. Data from NOAA and Air Force reconnaissance aircraft indicate that the maximum sustained winds remain near 150 mph (240 km/h) with higher gusts. Dorian is a category 4 hurricane on the Saffir-Simpson Hurricane Wind Scale. Some fluctuations in intensity are likely, but Dorian is expected to remain a powerful hurricane during the next few days. Hurricane-force winds extend outward up to 30 miles (45 km) from the center and tropical-storm-force winds extend outward up to 105 miles (165 km). The latest minimum central pressure estimated from reconnaissance aircraft data is 940 mb (27.76 inches). HAZARDS AFFECTING LAND ---------------------- WIND: Hurricane conditions are expected in the hurricane warning area across the northwestern Bahamas by Sunday, with tropical storm winds beginning overnight. Tropical storm conditions are possible within the tropical storm watch area on Monday. STORM SURGE: A life-threatening storm surge will raise water levels by as much as 15 to 20 feet above normal tide levels in areas of onshore winds on the Abaco Islands and Grand Bahama Island. Near the coast, the surge will be accompanied by large and destructive waves. RAINFALL: Dorian is expected to produce the following rainfall accumulations this weekend into the middle of next week: Northwestern Bahamas...10 to 15 inches, isolated 25 inches. Coastal sections of the southeast United States from central Florida northward through the Carolinas...4 to 8 inches, isolated 12 inches. Central Bahamas and South Florida...2 to 4 inches, isolated 6 inches. This rainfall may cause life-threatening flash floods. SURF: Large swells will affect the east-facing shores of the Bahamas, the Florida east coast, and the southeastern United States coast during the next few days. These swells are likely to cause life-threatening surf and rip current conditions. Please consult products from your local weather office. NEXT ADVISORY ------------- Next intermediate advisory at 200 AM EDT. Next complete advisory at 500 AM EDT. $$ Forecaster Brown
000 WTNT45 KNHC 010256 TCDAT5 Hurricane Dorian Discussion Number 31 NWS National Hurricane Center Miami FL AL052019 1100 PM EDT Sat Aug 31 2019 Data from both Air Force and NOAA Hurricane Hunter aircraft indicate that Dorian remains a very powerful hurricane, and the satellite presentation is still quite impressive with a very stable, well-defined eye. There has been no evidence of concentric eyewalls in aircraft or microwave data, which is somewhat surprising given that the intensity has been at category 4 strength for 24 hours. Both aircraft measured peak flight-level winds that support an initial intensity of 130 kt. There have been some higher surface wind estimates from the SFMR, but these data are questionable based on our experience of very high SFMR-measured wind speeds in recent strong hurricanes that didn't match standard flight-level wind reductions. Dorian is forecast to continue moving over very warm waters and into a low-shear environment during the next 12-24 hours, so some additional strengthening is possible. Difficult-to-predict eyewall cycles, however, are likely to begin at some point within the next day or so and could cause fluctuations in intensity. After 72 hours, increasing southerly shear is likely to produce gradual weakening, but Dorian is foreast to remain a dangerous hurricane through the forecast period. The hurricane is moving westward or 280/7 kt. A high pressure ridge to the north of Dorian is predicted to remain intact into early Sunday, and the hurricane should continue westward. By late Sunday, the dynamical models erode the western portion of the ridge, which should cause the hurricane to slow down and become nearly stationary over the northwestern Bahamas in 36 to 48 hours. After that time, the weakness in the ridge becomes more pronounced, and Dorian is expected to turn northwestward, and eventually northeastward near the southeastern United States coast. Although there is general agreement on this overall scenario, there is still considerable spread on how close the storm will track to the east coast of Florida and the southeastern coast of the United States. The latest HWRF run has shifted westward and takes Dorian across the coast of central Florida. The 18Z GFS also shifted a little left closer to the Florida coast. The latest multi-model consensus aids shifted west closer to the previous NHC track, so very little change to that forecast was made. Although the exact NHC track forecast lies east of the Florida peninsula, a track closer to the coast or even a landfall remain a possibility. Since the updated track was slightly slower than the previous advisory, no additional watches are needed for Florida at this time. Key Messages: 1. A prolonged period of life-threatening storm surge, devastating hurricane-force winds, and heavy rains capable of life-threatening flash floods are expected on the Abaco Islands and Grand Bahama Sunday through Monday, and a hurricane warning is in effect for these areas. 2. A tropical storm watch is in effect for a portion of the Florida east coast. Since Dorian is forecast to slow down and turn northward as it approaches the coast, life-threatening storm surge and dangerous hurricane-force winds are still possible along portions of the Florida east coast by the early to middle part of next week. Residents should have their hurricane plan in place, know if they are in a hurricane evacuation zone, and listen to advice given by local emergency officials. 3. There is an increasing risk of strong winds and dangerous storm surge along the coasts of Georgia, South Carolina, and North Carolina during the middle of next week. Residents in these areas should continue to monitor the progress of Dorian. 4. Heavy rains, capable of life-threatening flash floods, are possible over coastal sections of the southeastern United States from Monday through Thursday. FORECAST POSITIONS AND MAX WINDS INIT 01/0300Z 26.3N 75.1W 130 KT 150 MPH 12H 01/1200Z 26.4N 76.3W 135 KT 155 MPH 24H 02/0000Z 26.6N 77.4W 130 KT 150 MPH 36H 02/1200Z 26.8N 78.1W 125 KT 145 MPH 48H 03/0000Z 27.0N 78.5W 120 KT 140 MPH 72H 04/0000Z 28.5N 79.3W 110 KT 125 MPH 96H 05/0000Z 31.1N 80.0W 95 KT 110 MPH 120H 06/0000Z 34.0N 77.0W 85 KT 100 MPH $$ Forecaster Brown
09-01-2019 03:10 AM
Seems like it will track along the coast. Thank you for this.
09-01-2019 08:49 AM
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