060 
FZPN03 KNHC 280931
HSFEP2

HIGH SEAS FORECAST
NWS NATIONAL HURRICANE CENTER MIAMI FL
1030 UTC MON AUG 28 2023

SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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

E PACIFIC FROM THE EQUATOR TO 30N E OF 140W AND 03.4S TO THE
EQUATOR E OF 120W

SYNOPSIS VALID 0600 UTC MON AUG 28.
24 HOUR FORECAST VALID 0600 UTC TUE AUG 29.
48 HOUR FORECAST VALID 0600 UTC WED AUG 30.

.WARNINGS.

...TROPICAL STORM WARNING...
.TROPICAL STORM IRWIN NEAR 17.6N 123.0W 997 MB AT 0900 UTC AUG 
28 MOVING WNW OR 290 DEG AT 9 KT. MAXIMUM SUSTAINED WINDS 35 KT 
GUSTS 45 KT. TROPICAL STORM FORCE WINDS WITHIN 0 NM OF CENTER 
EXCEPT 220 NM NE QUADRANT. SEAS 12 FT OR GREATER WITHIN 0 NM W 
SEMICIRCLE...120 NM NE QUADRANT AND 30 NM SE QUADRANT WITH SEAS 
TO 15 FT. ELSEWHERE WITHIN 360 NE QUADRANT...300 SE QUADRANT 
...60 NM SW QUADRANT AND 240 NM NW QUADRANT WINDS 20 TO 33 KT. 
SEAS 8 TO 12 FT.
.24 HOUR FORECAST TROPICAL STORM IRWIN NEAR 18.4N 126.9W.
MAXIMUM SUSTAINED WINDS 35 KT GUSTS 45 KT. TROPICAL STORM FORCE 
WINDS WITHIN 0 NM OF CENTER EXCEPT 150 NM NE QUADRANT. SEAS 12 
FT OR GREATER WITHIN 120 NM NE QUADRANT...30 NM S SEMICIRCLE AND 
60 NW NW QUADRANT WITH SEAS TO 16 FT. ELSEWHERE WITHIN 180 NM NE 
QUADRANT...120 NM SE QUADRANT...60 NM SW QUADRANT AND 300 NM NW 
QUADRANT WINDS 20 TO 33 KT. SEAS 8 TO 12 FT.
.48 HOUR FORECAST TROPICAL DEPRESSION IRWIN NEAR 18.3N 132.4W.
MAXIMUM SUSTAINED WINDS 30 KT GUSTS 40 KT. WITHIN 120 NM E 
SEMICIRCLE...60 NM SW QUADRANT AND 300 NM NW QUADRANT WINDS 20 
TO 30 KT. SEAS 8 TO 12 FT...EXCEPT 10 TO 14 FT FROM 18N TO 14N 
BETWEEN 130W AND 135W. ELSEWHERE FROM 16N TO 27N BETWEEN 128W 
AND 140W WINDS 20 KT OR LESS. SEAS 8 TO 9 FT IN E SWELL.
.72 HOUR FORECAST POST-TROPICAL REMNANT LOW IRWIN NEAR 18.6N 
136.6W. MAXIMUM SUSTAINED WINDS 30 KT GUSTS 40 KT. 
EXTENDED OUTLOOK...USE FOR GUIDANCE ONLY...ERRORS MAY BE LARGE.
.96 HOUR FORECAST POST-TROPICAL REMNANT LOW IRWIN NEAR 19.0N 
139.5W. MAXIMUM SUSTAINED WINDS 30 KT GUSTS 40 KT.
.120 HOUR FORECAST POST-TROPICAL REMNANT LOW IRWIN NEAR 19.0N 
142.0W. MAXIMUM SUSTAINED WINDS 25 KT GUSTS 35 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.

.FROM 10N TO 12N W OF 138W NE TO E WINDS 20 TO 25 KT. SEAS 8 TO 
9 FT.
.06 HOUR FORECAST WINDS 20 KT OR LESS. SEAS LESS THAN 8 FT.

.S OF 06N BETWEEN 121W AND 125W WINDS 20 KT OR LESS. SEAS 8 FT 
IN SE SWELL.
.24 HOUR S OF 09N BETWEEN 121W AND 136W WINDS 20 KT OR LESS.
SEAS 8 TO 9 FT IN SE SWELL.
.48 HOUR FORECAST S OF A LINE FROM 10N140W TO 03N120W TO 04N110W 
TO 02N100W TO 03.4S86W WINDS 20 KT OR LESS. SEAS 8 TO 10 FT IN S 
SWELL.

.30 HOUR FORECAST N OF 28N BETWEEN 120W AND 125 WINDS 20 KT OR 
LESS. SEAS 8 TO 9 FT IN N TO NE SWELL.
.48 HOUR FORECAST N OF 27N BETWEEN 118W AND 127W WINDS 20 KT OR 
LESS. SEAS 8 TO 9 FT IN N TO NE SWELL.

.REMAINDER OF AREA WINDS 20 KT OR LESS. SEAS LESS THAN 8 FT.

CONVECTION VALID AT 0915 UTC MON AUG 28...

.TROPICAL STORM IRWIN...NUMEROUS MODERATE ISOLATED 
STRONG FROM 15N TO 20N BETWEEN 117W AND 119W. SCATTERED MDOERATE 
ISOLATED STRONG FROM 16N TO 18N BETWEEN 121W AND 122W.

.INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...
MONSOON TROUGH EXTENDS FROM 10N85W TO 13N99W TO 16N110W. IT 
RESUMES SW OF IRWIN AT 10N125W TO 08N132W TO 08N140W. SCATTERED 
MODERATE ISOLATED STRONG FROM 05N TO 09N BETWEEN 87W AND 98W.

$$
.FORECASTER AGUIRRE. NATIONAL HURRICANE CENTER.