836 
FZPN03 KNHC 170327
HSFEP2

HIGH SEAS FORECAST
NWS NATIONAL HURRICANE CENTER MIAMI FL
0430 UTC MON JUL 17 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 0000 UTC MON JUL 17.
24 HOUR FORECAST VALID 0000 UTC TUE JUL 18.
48 HOUR FORECAST VALID 0000 UTC WED JUL 19.

.WARNINGS.

...TROPICAL STORM WARNING...
.TROPICAL STORM CALVIN NEAR 16.4N 137.9W 998 MB AT 0300 UTC JUL
17 MOVING W OR 280 DEG AT 15 KT. MAXIMUM SUSTAINED WINDS 50 KT
GUSTS 60 KT. TROPICAL STORM FORCE WINDS WITHIN 80 NM N SEMICIRCLE...60
NM SE QUADRANT AND 50 NM SW QUADRANT. SEAS 12 FT OR GREATER 
WITHIN 90 NM S SEMICIRCLE...240 NM NE QUADRANT AND 180 NM NW 
QUADRANT WITH SEAS TO 27 FT. ELSEWHERE WITHIN 19N136W TO 19N138W 
TO 18N139W TO 16N139W TO 15N137W TO 17N135W TO 19N136W WINDS 20 
TO 33 KT. SEAS 10 TO 12 FT. REMAINDER OF AREA WITHIN 19N133W TO 
22N134W TO 22N140W TO 12N140W TO 11N137W TO 14N134W TO 19N133W 
WINDS 20 KT OR LESS. SEAS 8 TO 10 FT IN MIXED SWELL.
.24 HOUR FORECAST TROPICAL STORM CALVIN W OF AREA NEAR 17.3N 
144.0W. OVER FORECAST WATERS E OF 140W WINDS 20 KT OR LESS. SEAS
LESS THAN 8 FT.
.48 HOUR FORECAST TROPICAL STORM CALVIN NEAR 18.3N 151.5W.
MAXIMUM SUSTAINED WINDS 35 KT GUSTS 45 KT. TROPICAL STORM FORCE
WINDS WITHIN 60 NM N SEMICIRCLE AND 20 NM S SEMICIRCLE. OVER
FORECAST WATERS E OF 140W WINDS 20 KT OR LESS. SEAS LESS THAN 8
FT.
EXTENDED OUTLOOK...USE FOR GUIDANCE ONLY...ERRORS MAY BE LARGE. 
.96 HOUR FORECAST POST- TROPICAL REMNANT LOW CALVIN NEAR 20.0N 
165.0W. MAXIMUM SUSTAINED WINDS 25 KT GUSTS 35 KT.
.120 HOUR FORECAST...DISSIPATED.

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.

.WITHIN 16N95W TO 15N96W TO 14N96W TO 15N95W TO
16N95W...INCLUDING THE GULF OF TEHUANTEPEC... N TO NE WINDS 20
TO 25 KT. SEAS LESS THAN 8 FT.
.12 HOUR FORECAST WITHIN 15N95W TO 16N95W TO 14N97W TO 12N102W
TO 11N101W TO 12N97W TO 15N95W...INCLUDING THE GULF OF
TEHUANTEPEC... E WINDS 20 TO 25 KT. SEAS LESS THAN 8 FT.
.24 HOUR FORECAST WITHIN 16N94W TO 16N96W TO 15N96W TO 14N96W TO
14N95W TO 15N94W TO 16N94W...INCLUDING THE GULF OF
TEHUANTEPEC... NW TO N WINDS 20 TO 25 KT. SEAS TO 8 FT. 
.48 HOUR FORECAST LITTLE CHANGE.

.WITHIN 11N86W TO 11N87W TO 11N89W TO 10N89W TO 09N87W TO 10N86W
TO 11N86W...INCLUDING THE GULF OF PAPAGAYO... NE TO E WINDS 20
TO 30 KT. SEAS LESS THAN 8 FT.
.24 HOUR FORECAST LITTLE CHANGE.
.48 HOUR FORECAST LITTLE CHANGE.

.24 HOUR FORECAST WITHIN 13N104W TO 14N104W TO 13N106W TO
12N107W TO 11N106W TO 12N104W TO 13N104W E WINDS 20 TO 25 KT.
SEAS LESS THAN 8 FT.
.48 HOUR FORECAST WITHIN 12N105W TO 13N108W TO 13N110W TO
12N111W TO 11N110W TO 10N106W TO 12N105W E TO SE WINDS 20 TO 30
KT. SEAS 8 FT.

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

CONVECTION VALID AT 0300 UTC MON JUL 17...

TROPICAL STORM CALVIN...SCATTERED MODERATE WITHIN 60 NM NE 
SEMICIRCLE OF CENTER.

.INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...
MONSOON TROUGH FROM 09N84W TO 09N95W TO 07N10W TO 09N110W TO 
05N125W. ITCZ FROM 05N125W TO 04N135W TO BEYOND 05N140W. 
SCATTERED MODERATE WITHIN 120 NM S OF THE MONSOON TROUGH BETWEEN
80W AND 90W...AND WITHIN 90 NM OF THE AXIS BETWEEN 100W AND 
125W.

$$
.FORECASTER CHRISTENSEN. NATIONAL HURRICANE CENTER.