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Potential Tropical Cyclone Eighteen Public Advisory Number 1A
2017-10-28 01:48:56| National Hurricane Center (Atlantic)
Issued at 800 PM EDT Fri Oct 27 2017 000 WTNT33 KNHC 272348 TCPAT3 BULLETIN Potential Tropical Cyclone Eighteen Intermediate Advisory Number 1A NWS National Hurricane Center Miami FL AL182017 800 PM EDT Fri Oct 27 2017 ...DISTURBANCE MOVING NORTH-NORTHWESTWARD THROUGH THE NORTHWESTERN CARIBBEAN SEA... SUMMARY OF 800 PM EDT...0000 UTC...INFORMATION ---------------------------------------------- LOCATION...17.8N 84.5W ABOUT 290 MI...465 KM SSW OF THE ISLE OF YOUTH ABOUT 380 MI...610 KM SSW OF HAVANA CUBA MAXIMUM SUSTAINED WINDS...40 MPH...65 KM/H PRESENT MOVEMENT...NNW OR 345 DEGREES AT 6 MPH...9 KM/H MINIMUM CENTRAL PRESSURE...1006 MB...29.71 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: None. SUMMARY OF WATCHES AND WARNINGS IN EFFECT: A Tropical Storm Warning is in effect for... * Isla de la Juventud, La Habana, Ciudad de la Habana, Matanzas, Cienfuegos, and Villa Clara * Northwestern Bahamas A Tropical Storm Watch is in effect for... * Central Bahamas A Tropical Storm Warning means that tropical storm conditions are expected somewhere within the warning area within 36 hours. A Tropical Storm Watch means that tropical storm conditions are possible within the watch area, in this case within 36 hours. Interests in the Cayman Islands, South Florida, and the Florida Keys should monitor the progress of this system. DISCUSSION AND 48-HOUR OUTLOOK ------------------------------ At 800 PM EDT (0000 UTC), the disturbance was centered near latitude 17.8 North, longitude 84.5 West. The system is moving toward the north-northwest near 6 mph (9 km/h). A faster northward motion is expected to begin tonight, followed by a faster motion toward the northeast on Saturday and Sunday. On the forecast track, the system will move across western Cuba late Saturday and move through the northwestern Bahamas Saturday night and early Sunday. Maximum sustained winds are near 40 mph (65 km/h) with higher gusts. Some strengthening is forecast during the next 24 to 36 hours. Environmental conditions are expected to be conducive for development, and the system is likely to become a tropical storm tonight or Saturday. * Formation chance through 48 hours...high...80 percent * Formation chance through 5 days...high...80 percent Tropical-storm-force winds extend outward up to 80 miles (130 km), mainly to the south of the center. The estimated minimum central pressure is 1006 mb (29.71 inches). HAZARDS AFFECTING LAND ---------------------- RAINFALL: The system has the potential to produce the following rainfall totals: Northern Honduras: Additional 1 to 3 inches through Friday night. Cayman Islands, western and central Cuba and northwestern Bahamas: 4 to 8 inches with maximum totals of 10 inches. These rainfall amounts may produce life threatening flash floods and mudslides. South Florida including the Florida Keys: 3 to 5 inches, isolated maximum of 8 inches possible. These rainfall totals may produce flash flooding, especially in urbanized areas. WIND: Tropical storm conditions are expected to first reach the warning area in Cuba Saturday and the northwestern Bahamas Saturday night. NEXT ADVISORY ------------- Next complete advisory at 1100 PM EDT. $$ Forecaster Beven
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