000 FZNT02 KNHC 180411 HSFAT2 HIGH SEAS FORECAST NWS NATIONAL HURRICANE CENTER MIAMI FL 0430 UTC WED AUG 18 2021 SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS SEAS GIVEN AS SIGNIFICANT WAVE HEIGHT...WHICH IS THE AVERAGE HEIGHT OF THE HIGHEST 1/3 OF THE WAVES. INDIVIDUAL WAVES MAY BE MORE THAN TWICE THE SIGNIFICANT WAVE HEIGHT. SECURITE ATLANTIC FROM 07N TO 31N W OF 35W INCLUDING CARIBBEAN SEA AND GULF OF MEXICO SYNOPSIS VALID 0000 UTC WED AUG 18. 24 HOUR FORECAST VALID 0000 UTC THU AUG 19. 48 HOUR FORECAST VALID 0000 UTC FRI AUG 20. .WARNINGS. ...ATLC TROPICAL STORM WARNING... .TROPICAL STORM HENRI NEAR 30.0N 65.1W 998 MB AT 0300 UTC AUG 18 MOVING WSW OR 255 DEG AT 7 KT. MAXIMUM SUSTAINED WINDS 55 KT GUSTS 65 KT. TROPICAL STORM FORCE WINDS WITHIN 50 NM N SEMICIRCLE...70 NM SE QUADRANT AND 0 NM SW QUADRANT. SEAS 12 FT OR GREATER WITHIN 60 NM E SEMICIRCLE...0 NM SW QUADRANT AND 30 NM NW QUADRANT WITH SEAS TO 16 FT. ELSEWHERE WITHIN 30N64W TO 29N65W TO 30N67W TO 31N67W TO 31N63W TO 30N64W WINDS 20 TO 33 KT. SEAS 8 TO 12 FT. .24 HOUR FORECAST TROPICAL STORM HENRI NEAR 29.9N 67.7W. MAXIMUM SUSTAINED WINDS 60 KT GUSTS 75 KT. TROPICAL STORM FORCE WINDS WITHIN 60 NM E SEMICIRCLE...20 NM SW QUADRANT AND 50 NM NW QUADRANT. SEAS 12 FT OR GREATER WITHIN 90 NE QUADRANT...60 NM SE AND NW QUADRANTS AND 30 NM SW QUADRANT WITH SEAS TO 20 FT. ELSEWHERE WITHIN 30N67W TO 30N68W TO 31N68W TO 31N67W TO 30N67W WINDS 20 TO 33 KT. SEAS 8 TO 12 FT. REMAINDER OF AREA WITHIN 29N67W TO 30N68W TO 29N70W TO 31N71W TO 31N65W TO 29N67W WINDS 20 KT OR LESS. SEAS 8 TO 10 FT IN MIXED SWELL. .48 HOUR FORECAST TROPICAL STORM HENRI NEAR 30.3N 71.0W. MAXIMUM SUSTAINED WINDS 60 KT GUSTS 75 KT. TROPICAL STORM FORCE WINDS WITHIN 80 NM E SEMICIRCLE...40 NM SW QUADRANT AND 50 NM NW QUADRANT. SEAS 12 FT OR GREATER WITHIN 120 NM NE QUADRANT...60 NM SE AND NW QUADRANTS AND 30 NM SW QUADRANT WITH SEAS TO 20 FT. ELSEWHERE WITHIN 30N69.5W TO 30N71W TO 30.5N71.5W TO 31N71W TO 31N69.5W TO 30N69.5W WINDS 20 TO 33 KT. SEAS 10 TO 14 FT. REMAINDER OF AREA WITHIN 29N70W TO 29N71W TO 31N74W TO 31N68W TO 29N70W WINDS 20 KT OR LESS. SEAS 8 TO 10 FT IN MIXED SWELL. .72 HOUR FORECAST HURRICANE HENRI NEAR 32.0N 71.9W. MAXIMUM SUSTAINED WINDS 70 KT GUSTS 85 KT. EXTENDED OUTLOOK...USE FOR GUIDANCE ONLY...ERRORS MAY BE LARGE. .96 HOUR FORECAST HURRICANE HENRI NEAR 36.6N 69.4W. MAXIMUM SUSTAINED WINDS 80 KT GUSTS 100 KT. .120 HOUR FORECAST HURRICANE HENRI NEAR 40.2N 65.0W. MAXIMUM SUSTAINED WINDS 80 KT GUSTS 100 KT. FORECAST WINDS IN AND NEAR ACTIVE TROPICAL CYCLONES SHOULD BE USED WITH CAUTION DUE TO UNCERTAINTY IN FORECAST TRACK...SIZE AND INTENSITY. ...CARIBBEAN AND GULF OF MEXICO HURRICANE WARNING... .TROPICAL STORM GRACE NEAR 18.4N 79.2W 1000 MB AT 0300 UTC AUG 18 MOVING W OR 280 DEG AT 12 KT. MAXIMUM SUSTAINED WINDS 50 KT GUSTS 60 KT. TROPICAL STORM FORCE WINDS WITHIN 100 NM NE QUADRANT...90 NM SE QUADRANT...0 NM SW QUADRANT...AND 60 NM NW QUADRANT. SEAS 12 FT OR GREATER WITHIN 120 NM NE QUADRANT...60 NM SE AND NW QUADRANTS AND 30 NM SW QUADRANT WITH SEAS TO 18 FT. ELSEWHERE WITHIN 19N75W TO 17N76W TO 17N79W TO 20N80W TO 22N76W TO 19N75W WINDS 20 TO 33 KT. SEAS 8 TO 12 FT. .24 HOUR FORECAST HURRICANE GRACE NEAR 19.5N 84.7W. MAXIMUM SUSTAINED WINDS 75 KT GUSTS 90 KT. TROPICAL STORM FORCE WINDS WITHIN 90 NM E SEMICIRCLE...40 NM SW QUADRANT AND 80 NM NW QUADRANT. SEAS 12 FT OR GREATER WITHIN 150 NM OF CENTER...EXCEPT 60 NM SW QUADRANT WITH SEAS TO 26 FT. ELSEWHERE WITHIN 18N81W TO 18N86W TO 23N87W TO 24N85W TO 22N81W TO 18N81W...INCLUDING THE STRAITS OF FLORIDA AND THE YUCATAN CHANNEL...WINDS 20 TO 33 KT. SEAS 10 TO 16 FT S OF 22N AND 8 TO 10 FT FROM 22N TO 24N. .48 HOUR FORECAST TROPICAL STORM GRACE OVER WATER NEAR 20.4N 90.7W. MAXIMUM SUSTAINED WINDS 50 KT GUSTS 60 KT. TROPICAL STORM FORCE WINDS WITHIN 100 NM NE QUADRANT...40 NM SE QUADRANT...30 NM SW QUADRANT...AND 70 NM NW QUADRANT. SEAS 12 FT OR GREATER WITHIN 180 NM NE QUADRANT...120 NM SE QUADRANT...60 NM SW QUADRANT AND 90 NM NW QUADRANT WITH SEAS TO 19 FT. ELSEWHERE WITHIN 22N85W TO 16N86W TO 21N89W TO 22N94W TO 26N92W TO 22N85W...INCLUDING THE YUCATAN CHANNEL AND WITHIN 60 NM OF CAMPECHE AND THE GULF OF HONDURAS...WINDS 20 TO 33 KT. SEAS 9 TO 14 FT...EXCEPT 8 FT GULF OF HONDURAS. .60 HOUR FORECAST HURRICANE GRACE NEAR 20.7N 93.2W. MAXIMUM SUSTAINED WINDS 65 KT GUSTS 80 KT. .72 HOUR FORECAST HURRICANE GRACE NEAR 20.8N 95.6W. MAXIMUM SUSTAINED WINDS 75 KT GUSTS 90 KT. EXTENDED OUTLOOK...USE FOR GUIDANCE ONLY...ERRORS MAY BE LARGE. .96 HOUR FORECAST TROPICAL STORM GRACE INLAND NEAR 20.7N 100.1W. MAXIMUM SUSTAINED WINDS 35 KT GUSTS 45 KT. .120 HOUR FORECAST POST-TROPICAL GRACE NEAR 20.5N 104.5W. MAXIMUM SUSTAINED WINDS 20 KT GUSTS 30 KT. FORECAST WINDS IN AND NEAR ACTIVE TROPICAL CYCLONES SHOULD BE USED WITH CAUTION DUE TO UNCERTAINTY IN FORECAST TRACK...SIZE AND INTENSITY. .SYNOPSIS AND FORECAST. .CARIBBEAN 24 HOUR FORECAST WITHIN 12N73W TO 12N74W TO 13N74W TO 13N73W TO 12N73W NE TO E WINDS 20 TO 25 KT. SEAS 8 FT. .42 HOUR FORECAST WINDS 20 KT OR LESS. SEAS LESS THAN 8 FT. .REMAINDER OF AREA WINDS 20 KT OR LESS. SEAS LESS THAN 8 FT. $$ .FORECASTER AGUIRRE. NATIONAL HURRICANE CENTER.