678 FZNT02 KNHC 200312 HSFAT2 HIGH SEAS FORECAST NWS NATIONAL HURRICANE CENTER MIAMI FL 0430 UTC FRI AUG 20 2021 SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS SEAS GIVEN AS SIGNIFICANT WAVE HEIGHT...WHICH IS THE AVERAGE HEIGHT OF THE HIGHEST 1/3 OF THE WAVES.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 FRI AUG 20. 24 HOUR FORECAST VALID 0000 UTC SAT AUG 21. 48 HOUR FORECAST VALID 0000 UTC SUN AUG 22. .WARNINGS. ...GULF OF MEXICO HURRICANE WARNING... .TROPICAL STORM GRACE NEAR 20.8N 91.8W 994 MB AT 0300 UTC AUG 20 MOVING W OR 280 DEG AT 14 KT. MAXIMUM SUSTAINED WINDS 55 KT GUSTS 65 KT. TROPICAL STORM FORCE WINDS WITHIN 140 NM NE QUADRANT...50 NM SE QUADRANT...40 NM SW QUADRANT...AND 130 NM NW QUADRANT. SEAS 12 FT OR GREATER WITHIN 150 NM NE QUADRANT...0 NM SE QUADRANT...60 NM SW QUADRANT...AND 180 NM NW QUADRANT WITH SEAS TO 17 FT. ELSEWHERE WITHIN 22N86W TO 20N94W TO 24N94W TO 26N91W TO 25N89W TO 22N86W WINDS 20 TO 33 KT. SEAS 8 TO 12 FT. .12 HOUR FORECAST HURRICANE GRACE NEAR 20.8N 93.7W. MAXIMUM SUSTAINED WINDS 65 KT GUSTS 80 KT. TROPICAL STORM FORCE WINDS WITHIN 130 NM N SEMICIRCLE...60 NM SE QUADRANT...AND 50 NM SW QUADRANT. SEAS 12 FT OR GREATER WITHIN 240 NM N SEMICIRCLE AND 75 NM S SEMICIRCLE WITH SEAS TO 28 FT. ELSEWHERE WITHIN WITHIN 22N89W TO 19N93W TO 19N96W TO 25N96W TO 27N92W TO 22N89W WINDS 20 TO 33 KT. SEAS 8 TO 12 FT. .24 HOUR FORECAST HURRICANE GRACE NEAR 20.7N 95.9W. MAXIMUM SUSTAINED WINDS 75 KT GUSTS 90 KT. TROPICAL STORM FORCE WINDS WITHIN 110 NM N SEMICIRCLE AND 80 NM S SEMICIRCLE. SEAS 12 FT OR GREATER OVER FORECAST WATERS WITHIN 210 NM N SEMICIRCLE...120 NM SE QUADRANT...AND 60 NM SW QUADRANT WITH SEAS TO 32 FT. ELSEWHERE WITHIN 19N94W TO 19N96W TO 22N98W TO 25N94W TO 24N92W TO 19N94W WINDS 20 TO 33 KT. SEAS 8 TO 12 FT. REMAINDER OF AREA WITHIN 20N93W TO 24N95W TO 22N98W TO 27N97W TO 25N92W TO 20N93W WINDS 20 KT OR LESS. SEAS 8 TO 11 FT IN MIXED SWELL. .36 HOUR FORECAST TROPICAL STORM GRACE INLAND NEAR 20.1N 98.2W. MAXIMUM SUSTAINED WINDS 45 KT GUSTS 55 KT. TROPICAL STORM FORCE WINDS WITHIN 30 NM OF CENTER...EXCEPT 80 NM NE QUADRANT. SEAS 12 FT OR GREATER OVER FORECAST WATERS WITHIN 0 NM OF CENTER...EXCEPT 180 NM NE QUADRANT WITH SEAS TO 15 FT. ELSEWHERE WITHIN 19N93W TO 19N96W TO 22N97W TO 23N95W TO 22N94W TO 19N93W WINDS 20 TO 30 KT. SEAS 8 TO 12 FT. REMAINDER OF AREA WITHIN 24N94W TO 23N96W TO 21N97W TO 24N98W TO 26N96W TO 24N94W WINDS 20 KT OR LESS. SEAS 8 TO 11 FT IN MIXED SWELL. .48 HOUR FORECAST POST-TROPICAL REMNANT LOW INLAND GRACE NEAR 19.6N 100.5W. MAXIMUM SUSTAINED WINDS 25 KT GUSTS 35 KT. OVER FORECAST WATERS .60 HOUR FORECAST...DISSIPATED. ...ATLC TROPICAL STORM WARNING... .TROPICAL STORM HENRI NEAR 29.8N 72.3W 997 MB AT 0300 UTC AUG 20 MOVING WNW OR 285 DEG AT 7 KT. MAXIMUM SUSTAINED WINDS 55 KT GUSTS 65 KT. TROPICAL STORM FORCE WINDS WITHIN 60 NM NW AND SE QUADRANTS...80 NM NE QUADRANT AND 40 NM SW QUADRANT. SEAS 12 FT OR GREATER WITHIN 120 NM N SEMICIRCLE AND 75 NM S SEMICIRCLE WITH SEAS TO 24 FT. ELSEWHERE WITHIN 29N69W TO 28N71W TO 29N74W TO 31N73W TO 31N69W TO 29N69W WINDS 20 TO 33 KT. SEAS 8 TO 12 FT. REMAINDER OF AREA WITHIN 27N71W TO 27N73W TO 29N75W TO 31N75W TO 31N69W TO 27N71W WINDS 20 KT OR LESS. SEAS 8 TO 11 FT IN MIXED SWELL. .24 HOUR FORECAST TROPICAL STORM HENRI N OF AREA NEAR 31.8N 73.3W. MAXIMUM SUSTAINED WINDS 60 KT GUSTS 75 KT. TROPICAL STORM FORCE WINDS WITHIN 90 NM NE QUADRANT...110 NM SE QUADRANT...80 NM SW QUADRANT...AND 50 NM NW QUADRANT. SEAS 12 FT OR GREATER WITHIN 120 NM OF CENTER...EXCEPT 45 NM SW QUADRANT WITH SEAS TO 27 FT. ELSEWHERE WITHIN 30.5N70.5W TO 30.5N73W TO 31N74W TO 31N70W TO 30.5N70.5W WINDS 20 TO 33 KT. SEAS 8 TO 12 FT. REMAINDER OF AREA WITHIN 30N72W TO 30N74W TO 31N78W TO 31N73W TO 31N70W TO 30N72W WINDS 20 KT OR LESS. SEAS 8 TO 11 FT IN MIXED SWELL. .36 HOUR FORECAST HURRICANE HENRI WELL N OF AREA NEAR 34.4N 72.2W. MAXIMUM SUSTAINED WINDS 65 KT GUSTS 80 KT. SEAS 12 FT OR GREATER N OF AREA. OVER FORECAST WATERS WINDS 20 KT OR LESS. SEAS LESS THAN 8 FT. 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. .ATLC 48 HOUR FORECAST WITHIN 20N71W TO 20N72W TO 20N73W TO 21N73W TO 21N71W TO 20N71W...INCLUDING APPROACH TO THE WINDWARD PASSAGE...E WINDS 20 TO 25 KT. SEAS LESS THAN 8 FT. .CARIBBEAN WITHIN 16N85W TO 16N86W TO 17N87W TO 18N87W TO 17N86W TO 16N85W...INCLUDING THE GULF OF HONDURAS...E TO SE WINDS 20 TO 25 KT. SEAS TO 8 FT. .12 HOUR FORECAST CONDITIONS IMPROVE. WINDS 20 KT OR LESS. SEAS LESS THAN 8 FT. .24 HOUR FORECAST LITTLE CHANGE. .48 HOUR FORECAST WITHIN 16N85W TO 16N87W TO 17N87W TO 17N85W TO 16N85W...INCLUDING THE GULF OF HONDURAS...E WINDS 20 TO 25 KT. SEAS LESS THAN 8 FT. .REMAINDER OF AREA WINDS 20 KT OR LESS. SEAS LESS THAN 8 FT. $$ .FORECASTER LEWITSKY. NATIONAL HURRICANE CENTER.