ZCZC MIATCPAT5 ALL TTAA00 KNHC DDHHMM BULLETIN Tropical Storm Don Advisory Number 3 NWS National Hurricane Center Miami FL AL052017 500 AM AST Tue Jul 18 2017 ...DON MOVING QUICKLY WESTWARD... ...EXPECTED TO REACH THE WINDWARD ISLANDS BY TONIGHT... SUMMARY OF 500 AM AST...0900 UTC...INFORMATION ---------------------------------------------- LOCATION...11.5N 56.2W ABOUT 250 MI...405 KM ESE OF BARBADOS ABOUT 375 MI...600 KM E OF GRENADA MAXIMUM SUSTAINED WINDS...50 MPH...85 KM/H PRESENT MOVEMENT...W OR 280 DEGREES AT 18 MPH...30 KM/H MINIMUM CENTRAL PRESSURE...1007 MB...29.74 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: None. SUMMARY OF WATCHES AND WARNINGS IN EFFECT: A Tropical Storm Warning is in effect for... * Grenada * St. Vincent and the Grenadines A Tropical Storm Watch is in effect for... * Barbados * St. Lucia * Bonaire A Tropical Storm Warning means that tropical storm conditions are expected somewhere within the warning area, in this case in the next 24 hours. A Tropical Storm Watch means that tropical storm conditions are possible within the watch area, in this case in the next 24 hours. Interests in Trinidad and Tobago, Aruba, and Curacao should monitor the progress of Don. For storm information specific to your area, please monitor products issued by your national meteorological service. DISCUSSION AND 48-HOUR OUTLOOK ------------------------------ At 500 AM AST (0900 UTC), the center of Tropical Storm Don was located near latitude 11.5 North, longitude 56.2 West. Don is moving toward the west near 18 mph (30 km/h), and this general motion, with an increase in forward speed, is expected through Wednesday evening. On the forecast track, the center of Don will move across the Windward Islands tonight, and then move westward across the southeastern Caribbean Sea on Wednesday. Maximum sustained winds are near 50 mph (85 km/h) with higher gusts. Some strengthening is possible through tonight while Don approaches the Windward Islands. Weakening is expected on Wednesday while Don moves across the southeastern Caribbean Sea. Tropical-storm-force winds extend outward up to 35 miles (55 km) from the center. The estimated minimum central pressure is 1007 mb (29.74 inches). HAZARDS AFFECTING LAND ---------------------- WIND: Tropical storm conditions are expected in the warning area by late afternoon and tonight. Tropical Storm conditions are possible in the watch area by tonight. RAINFALL: Don is expected to produce total rain accumulations of 3 to 6 inches across Barbados and the southern Windward Islands through Wednesday morning. These rains could produce life-threatening flash floods and mudslides, especially in mountainous areas. NEXT ADVISORY ------------- Next intermediate advisory at 800 AM AST. Next complete advisory at 1100 AM AST. $$ Forecaster Stewart NNNN