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Hurricane Maria Public Advisory Number 16A
2017-09-20 07:53:50| National Hurricane Center (Atlantic)
Issued at 200 AM AST Wed Sep 20 2017 000 WTNT35 KNHC 200553 TCPAT5 BULLETIN Hurricane Maria Intermediate Advisory Number 16A NWS National Hurricane Center Miami FL AL152017 200 AM AST Wed Sep 20 2017 ...CORE OF POTENTIALLY CATASTROPHIC CATEGORY 5 HURRICANE MARIA EXPECTED TO REACH SOUTHEASTERN PUERTO RICO THIS MORNING... SUMMARY OF 200 AM AST...0600 UTC...INFORMATION ---------------------------------------------- LOCATION...17.6N 65.1W ABOUT 20 MI...35 KM WSW OF ST. CROIX ABOUT 85 MI...140 KM SE OF SAN JUAN PUERTO RICO MAXIMUM SUSTAINED WINDS...165 MPH...270 KM/H PRESENT MOVEMENT...WNW OR 300 DEGREES AT 10 MPH...17 KM/H MINIMUM CENTRAL PRESSURE...910 MB...26.87 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: The government of the Netherlands has discontinued the Tropical Storm Warning for St. Eustatius. SUMMARY OF WATCHES AND WARNINGS IN EFFECT: A Hurricane Warning is in effect for... * U.S. Virgin Islands * British Virgin Islands * Puerto Rico, Culebra, and Vieques * Dominican Republic from Cabo Engano to Puerto Plata A Tropical Storm Warning is in effect for... * Saba * St. Maarten * Guadeloupe * Dominican Republic west of Puerto Plata to the northern border of the Dominican Republic and Haiti * Dominican Republic west of Cabo Engano to Punta Palenque A Hurricane Watch is in effect for... * Saba and St. Eustatius * St. Maarten * St. Martin and St. Barthelemy * Dominican Republic from Isla Saona to Cabo Engano * Turks and Caicos Islands and the Southeastern Bahamas 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. A Hurricane Watch means that hurricane conditions are possible within the watch area. A watch is typically issued 48 hours before the anticipated first occurrence of tropical-storm-force winds, conditions that make outside preparations difficult or dangerous. Interests elsewhere in Hispaniola and the Bahamas should monitor the progress of Maria. 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 the United States, please monitor products issued by your national meteorological service. DISCUSSION AND 48-HOUR OUTLOOK ------------------------------ At 200 AM AST (0600 UTC), the eye of Hurricane Maria was located near latitude 17.6 North, longitude 65.1 West. Maria is moving toward the west-northwest near 10 mph (17 km/h). A west-northwest to northwest motion is expected to continue through today, followed by a northwestward motion on Thursday. On the forecast track, the eye of Maria will cross Puerto Rico today, and pass just north of the northeast coast of the Dominican Republic tonight and Thursday. Maximum sustained winds are near 165 mph (270 km/h) with higher gusts. Maria is a potentially catastrophic category 5 hurricane on the Saffir-Simpson Hurricane Wind Scale. Some fluctuations in intensity could occur before the hurricane reaches Puerto Rico, but Maria is forecast to remain an extremely dangerous category 4 or 5 hurricane as it moves over Puerto Rico. Slow weakening is expected after the hurricane emerges over the Atlantic north of Puerto Rico and the Dominican Republic. Hurricane-force winds extend outward up to 60 miles (95 km) from the center, and tropical-storm-force winds extend outward up to 150 miles (240 km). A sustained wind of 104 mph (167 km/h) with a wind gust to 137 mph (220 km/h) was reported within the hour in the western portion of St. Croix in the U.S. Virgin Islands. The latest minimum central pressure estimated from Air Force Hurricane Hunter observations is 910 mb (26.87 inches). HAZARDS AFFECTING LAND ---------------------- WIND: Tropical storm conditions will continue in portions of the warning area in the Leeward Islands this morning. Tropical storm and hurricane conditions are occurring over the Virgin Islands and will spread over Puerto Rico in the next few hours. Hurricane conditions are expected within the Hurricane Warning area in the Dominican Republic tonight, with tropical storm conditions expected by later today. Tropical storm conditions are expected in the Tropical Storm Warning areas in the Dominican Republic later today. Hurricane and tropical storm conditions are possible on Thursday in the Turks and Caicos Islands and the southeastern Bahamas. Wind speeds atop and on the windward sides of hills and mountains and on high-rise buildings could be much stronger than the near- surface winds indicated in this advisory. STORM SURGE: A dangerous storm surge accompanied by large and destructive waves will raise water levels by as much as 7 to 11 feet above normal tide levels in portions of the hurricane warning area near the British Virgin Islands. A dangerous storm surge accompanied by large and destructive waves will raise water levels by as much as 4 to 6 feet above normal tide levels in the hurricane warning area in the Dominican Republic, and 1 to 3 ft elsewhere along the northern coasts of the Dominican Republic and Haiti. The combination of a dangerous storm surge and the tide will cause normally dry areas near the coast to be flooded by rising waters moving inland from the shoreline. The water is expected to reach the following heights above ground if the peak surge occurs at the time of high tide... Puerto Rico and the U.S. Virgin Islands...6 to 9 ft The deepest water will occur along the immediate coast near and to the north and east of the landfall location, where the surge will be accompanied by large and destructive waves. Surge-related flooding depends on the relative timing of the surge and the tidal cycle, and can vary greatly over short distances. For information specific to your area, please see products issued by your local National Weather Service forecast office. RAINFALL: Maria is expected to produce the following rain accumulations through Friday: Central and southern Leeward Islands...additional 1 to 3 inches. Northern Leeward Islands from Barbuda to Anguilla...additional 3 to 6 inches. U.S. and British Virgin Islands...additional 8 to 12 inches, isolated 16 inches. Puerto Rico...12 to 18 inches, isolated 25 inches. Eastern Dominican Republic...4 to 8 inches, isolated 12 inches. Rainfall on all of these islands will cause life-threatening flash floods and mudslides. TORNADOES: Several tornadoes are possible over Puerto Rico and the U.S. Virgin Islands today. SURF: Swells generated by Maria are affecting the Leeward Islands, Puerto Rico, and the Virgin Islands. These swells will begin affecting the northern coast of Hispaniola, the Turks and Caicos Islands, and the Southeastern Bahamas during the next day or two. These swells are likely to cause life-threatening surf and rip current conditions. Please consult products from your local weather office. NEXT ADVISORY ------------- Next complete advisory at 500 AM AST. $$ Forecaster Pasch
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