Tropical Storm Matthew Moving Into Eastern Caribbean
Tropical Storm Matthew Moving Into Eastern Caribbean
Winds 60 MPH
Tropical Storm Matthew continues to organize this afternoon though the latest Air Force plane report has not shown any additional strengthening., We would not expect much strengthening until the system clears the islands later this evening. The plane reported a pressure of 1009 MB and a flight level wind of 62 knots. This justifies keeping the maximum winds at 60 mph for the time being
000 URNT12 KNHC 281740 VORTEX DATA MESSAGE AL972016 A. 28/17:11:40Z B. 13 deg 45 min N 061 deg 12 min W C. NA D. 36 kt E. 113 deg 145 nm F. 152 deg 39 kt G. 113 deg 145 nm H. EXTRAP 1009 mb I. 20 C / 451 m J. 24 C / 298 m K. 20 C / NA L. NA M. NA N. 1345 / 01 O. 0.02 / 2 nm P. AF303 02FFA INVEST OB 11 MAX OUTBOUND AND MAX FL WIND 62 KT 342 / 84 NM 17:35:00Z SLP EXTRAP FROM BELOW 1500 FT ;
The important features of this code are the position. The first line A is date and time so this is observation is from 11 minutes 40 seconds past 12 noon. Line B is the position. Divide the minutes by 6 to get the fractional latitude or longitude. In this report the center was located at 13.7 north and 61.2 west. D is the maximum wind observed. Line H is the lowest pressure either measured or extrapolated. Then down at the remarks you will often see the maximum flight level wind. In this case it was 62 knots.
..TROPICAL STORM CONDITIONS SPREADING ACROSS PORTIONS OF THE LESSER ANTILLES... SUMMARY OF 200 PM AST...1800 UTC...INFORMATION ---------------------------------------------- LOCATION...13.6N 61.3W ABOUT 25 MI...40 KM SW OF ST. LUCIA ABOUT 20 MI...35 KM NNW OF ST. VINCENT MAXIMUM SUSTAINED WINDS...60 MPH...95 KM/H PRESENT MOVEMENT...W OR 275 DEGREES AT 20 MPH...31 KM/H MINIMUM CENTRAL PRESSURE...1008 MB...29.77 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: None. SUMMARY OF WATCHES AND WARNINGS IN EFFECT: A Tropical Storm Warning is in effect for... * Guadeloupe and Martinique * St. Lucia * Dominica, Barbados, St. Vincent, and the Grenadine Islands A Tropical Storm Warning means that tropical storm conditions are expected somewhere within the warning. Interests in Bonaire, Curacao, Aruba, and elsewhere in the Lesser Antilles should monitor the progress of Matthew. For storm information specific to your area, please monitor products issued by your national meteorological service. DISCUSSION AND 48-HOUR OUTLOOK ------------------------------ At 200 PM AST (1800 UTC), the center of Tropical Storm Matthew was located near latitude 13.6 North, longitude 61.3 West. Matthew is moving toward the west near 20 mph (31 km/h). A westward motion with some decrease in forward speed is expected during the next couple of days. On the forecast track, the center of Matthew will move away from the Windward Islands through this evening, and be over the eastern and central Caribbean Sea through Friday. Maximum sustained winds are near 60 mph (95 km/h) with higher gusts. Gradual strengthening is forecast during the next couple of days, and Matthew could become a hurricane by Friday. Tropical-storm-force winds extend outward up to 205 miles (335 km) primarily to the northeast of the center. Winds of 39 mph (63 km/h) were recently reported on Barbados, and a weather station on Martinique recently observed sustained winds of 47 mph (75 km/h) with gusts to 60 mph (97 km/h). The minimum central pressure estimated from recent reconnaissance data is 1008 mb (29.77 inches). HAZARDS AFFECTING LAND ---------------------- WIND: Tropical storm conditions will continue to spread over the southern Leeward Islands and northern Windward Islands within the warning area this afternoon and continue into this evening. RAINFALL: Matthew is expected to produce total rainfall accumulations of 4 to 8 inches across the Windward Islands and southern portions of the Leeward Islands through Thursday. These rains may produce life-threatening flash floods and mud slides. Rainfall totals of 1 to 2 inches are expected farther to the north into the northern Leeward Islands, including the United States and British Virgin Islands and Puerto Rico.
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