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ZCZC MIATCMAT4 ALL TTAA00 KNHC DDHHMM HURRICANE GERT FORECAST/ADVISORY NUMBER 21 NATIONAL WEATHER SERVICE MIAMI FL AL0999 1500Z THU SEP 16 1999 HURRICANE CENTER LOCATED NEAR 18.3N 52.9W AT 16/1500Z POSITION ACCURATE WITHIN 15 NM PRESENT MOVEMENT TOWARD THE WEST OR 275 DEGREES AT 8 KT ESTIMATED MINIMUM CENTRAL PRESSURE 941 MB EYE DIAMETER 18 NM MAX SUSTAINED WINDS 125 KT WITH GUSTS TO 150 KT 64 KT....... 40NE 40SE 40SW 40NW 50 KT....... 80NE 80SE 80SW 80NW 34 KT.......150NE 125SE 125SW 150NW 12 FT SEAS..200NE 200SE 200SW 200NW ALL QUADRANT RADII IN NAUTICAL MILES REPEAT...CENTER LOCATED NEAR 18.3N 52.9W AT 16/1500Z AT 16/1200Z CENTER WAS LOCATED NEAR 18.2N 52.5W FORECAST VALID 17/0000Z 18.5N 54.0W MAX WIND 120 KT...GUSTS 145 KT 64 KT... 40NE 40SE 40SW 40NW 50 KT... 80NE 80SE 80SW 80NW 34 KT...150NE 125SE 125SW 150NW FORECAST VALID 17/1200Z 19.5N 55.5W MAX WIND 120 KT...GUSTS 145 KT 64 KT... 40NE 40SE 40SW 40NW 50 KT... 80NE 80SE 80SW 80NW 34 KT...150NE 125SE 125SW 150NW FORECAST VALID 18/0000Z 20.5N 57.0W MAX WIND 115 KT...GUSTS 140 KT 64 KT... 40NE 40SE 40SW 40NW 50 KT... 80NE 80SE 80SW 80NW 34 KT...150NE 125SE 125SW 150NW REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 18.3N 52.9W EXTENDED OUTLOOK...USE FOR GUIDANCE ONLY...ERRORS MAY BE LARGE OUTLOOK VALID 18/1200Z 22.5N 58.5W MAX WIND 115 KT...GUSTS 140 KT 50 KT... 80NE 80SE 80SW 80NW OUTLOOK VALID 19/1200Z 27.0N 61.0W MAX WIND 115 KT...GUSTS 140 KT 50 KT... 80NE 80SE 80SW 80NW NEXT ADVISORY AT 16/2100Z AVILA STRIKE PROBABILITIES ASSOCIATED WITH THIS ADVISORY NUMBER CAN BE FOUND UNDER AFOS HEADER MIASPFAT4 AND WMO HEADER WTNT74 KNHC. NNNN