000
FZPN03 KNHC 281557
HSFEP2

HIGH SEAS FORECAST
NWS NATIONAL HURRICANE CENTER MIAMI FL
1630 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 1200 UTC MON AUG 28.
24 HOUR FORECAST VALID 1200 UTC TUE AUG 29.
48 HOUR FORECAST VALID 1200 UTC WED AUG 30.

.WARNINGS.

...TROPICAL STORM WARNING...
.TROPICAL STORM IRWIN NEAR 18.0N 123.6W 997 MB AT 1500 UTC AUG
28 MOVING WNW OR 290 DEG AT 7 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 90 NM N
SEMICIRCLE...30 NM SE QUADRANT AND 0 NM SW QUADRANT WITH SEAS TO
14 FT. ELSEWHERE WITHIN 20N119W TO 22N123W TO 20N127W TO 15N125W 
TO 15N121W TO 20N119W WINDS 20 TO 33 KT. SEAS 8 TO 12 FT.
.24 HOUR FORECAST TROPICAL DEPRESSION IRWIN NEAR 18.7N 127.9W. 
MAXIMUM SUSTAINED WINDS 30 KT GUSTS 40 KT. SEAS 12 FT OR GREATER 
WITHIN 90 NM N SEMICIRCLE WITH SEAS TO 15 FT. WITHIN 22N127W TO 
21N131W TO 19N131W TO 17N129W TO 18N125W TO 22N127W WINDS 20 TO 
30 KT. SEAS 10 TO 12 FT. ELSEWHERE WITHIN 23N124W TO 24N130W TO 
20N133W TO 18N132W TO 18N125W TO 20N124W TO 23N124W WINDS 20 KT 
OR LESS. SEAS 8 TO 10 FT IN MIXED SWELL.
.48 HOUR FORECAST POST-TROPICAL REMNANT LOW IRWIN NEAR 18.6N 
133.1W. MAXIMUM SUSTAINED WINDS 30 KT GUSTS 40 KT. SEAS 12 FT OR 
GREATER WITHIN 60 NM N SEMICIRCLE WITH SEAS TO 15 FT. WITHIN 
21N132W TO 23N136W TO 22N140W TO 19N140W TO 16N135W TO 17N132W TO
21N132W WINDS 20 TO 30 KT. SEAS 10 TO 12 FT. ELSEWHERE WITHIN 
28N130W TO 28N135W TO 26N140W TO 23N140W TO 23N135W TO 21N131W TO
28N130W WINDS 20 KT OR LESS. SEAS 8 TO 10 FT IN MIXED SWELL.
.72 HOUR FORECAST POST-TROPICAL REMNANT LOW IRWIN NEAR 18.8N
137.2W. 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 19.1N
139.9W. MAXIMUM SUSTAINED WINDS 30 KT GUSTS 40 KT.
.120 HOUR FORECAST POST-TROPICAL REMNANT LOW IRWIN NEAR 19.0N
142.2W. 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.

.24 HOUR FORECAST WITHIN 30N120W TO 30N123W TO 29N123W TO
29N122W TO 29N121W TO 30N120W WINDS 20 KT OR LESS. SEAS 8 TO 9
FT IN NE SWELL.
.48 HOUR FORECAST WITHIN 30N119W TO 30N127W TO 28N127W TO
27N122W TO 28N120W TO 30N119W NW TO N WINDS 20 TO 25 KT. SEAS 8
TO 9 FT.

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

CONVECTION VALID AT 1530 UTC MON AUG 28...

.T.S. IRWIN...SCATTERED MODERATE FROM 15N TO 20N BETWEEN 
118W AND 125W.

.INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...
MONSOON TROUGH FROM 10N86W TO 19N115W...THEN RESUMES W OF IRWIN 
NEAR 12N124W TO 08N137W. ITCZ FROM THAT POINT TO BEYOND 08N140W. 
SCATTERED MODERATE FROM 05N-20N AND E OF 110W AND WITHIN 200 NM S
OF THE ITCZ.

$$
.FORECASTER ERA. NATIONAL HURRICANE CENTER.