000
FZPN03 KNHC 310242
HSFEP2

HIGH SEAS FORECAST
NWS NATIONAL HURRICANE CENTER MIAMI FL
0430 UTC MON JUL 31 2017

SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 31.
24 HOUR FORECAST VALID 0000 UTC TUE AUG 01.
48 HOUR FORECAST VALID 0000 UTC WED AUG 02.

.WARNINGS.

...TROPICAL STORM WARNING...
.TROPICAL STORM IRWIN NEAR 19.8N 126.2W 1000 MB AT 0300 UTC JUL 
31 MOVING NNW OR 335 DEG AT 11 KT. MAXIMUM SUSTAINED WINDS 55 KT 
GUSTS 65 KT. TROPICAL STORM FORCE WINDS WITHIN 50 NM NE 
QUADRANT...60 NM SE QUADRANT...40 NM SW QUADRANT...AND 30 NM NW 
QUADRANT. SEAS 12 FT OR GREATER WITHIN 90 NM E SEMICIRCLE AND 60 
NM W SEMICIRCLE WITH SEAS TO 21 FT. ELSEWHERE WITHIN 120 NM NE 
AND 90 NM SW SEMICIRCLES WINDS 20 TO 33 KT. SEAS 9 TO 12 FT. 
REMAINDER OF AREA BOUNDED BY 21N130W TO 24N124W TO 21N119W TO 
15N126W TO 21N130W WINDS 20 KT OR LESS. SEAS 8 TO 12 FT IN MIXED 
SWELL.
.24 HOUR FORECAST TROPICAL STORM IRWIN NEAR 23.9N 128.2W.
MAXIMUM SUSTAINED WINDS 40 KT GUSTS 50 KT. TROPICAL STORM FORCE 
WINDS WITHIN 40 NM E SEMICIRCLE...0 NM SW QUADRANT AND 30 NM NW 
QUADRANT. SEAS 12 FT OR GREATER WITHIN 60 NM NW SEMICIRCLE WITH 
SEAS TO 13 FT. ELSEWHERE WITHIN 90 NM OF CENTER WINDS 20 TO 33 
KT. SEAS 9 TO 12 FT. REMAINDER OF AREA BOUNDED BY 25N124W TO 
21N129W TO 27N137W TO 29N133W TO 25N124W WINDS 20 KT OR LESS. 
SEAS TO 10 FT IN MIXED SWELL.
.36 HOUR FORECAST POST-TROPICAL REMNANT LOW IRWIN NEAR 26.0N 
129.6W. MAXIMUM SUSTAINED WINDS 30 KT GUSTS 40 KT. WITHIN 150 
NM N AND 90 NM S SEMICIRCLES WINDS 20 TO 30 KT. SEAS 8 TO 10 FT.
.48 HOUR FORECAST POST-TROPICAL REMNANT LOW IRWIN NEAR 27.6N 
131.1W. WITHIN 60 NM OF CENTER WINDS 20 TO 25 KT. SEAS 8 TO 9 FT.
.72 HOUR FORECAST POST-TROPICAL REMNANT LOW IRWIN NEAR 28.9N 
133.0W. MAXIMUM SUSTAINED WINDS 20 KT GUSTS 30 KT.
EXTENDED OUTLOOK...USE FOR GUIDANCE ONLY...ERRORS MAY BE LARGE.
.96 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.

.POST-TROPICAL CYCLONE HILARY NEAR 25.6N 128.5W 1007 MB AT 0300 
UTC JUL 31 MOVING WNW OR 300 DEG AT 12 KT. MAXIMUM SUSTAINED 
WINDS 30 KT GUSTS 40 KT. SEAS 12 FT OR GREATER WITHIN 60 NM N 
SEMICIRCLE AND 0 NM S SEMICIRCLE WITH SEAS TO 13 FT. ELSEWHERE 
WITHIN 120 NM N AND 90 NM S SEMICIRCLES WINDS 20 TO 33 KT. SEAS 
9 TO 12 FT. REMAINDER OF AREA BOUNDED BY 21N130W TO 24N124W TO 
30N125W TO 26N135W TO 21N130W WINDS 20 KT OR LESS. SEAS 8 TO 12 
FT IN MIXED SWELL.
.24 HOUR FORECAST POST-TROPICAL REMNANT LOW HILARY NEAR 27.3N 
132.3W. MAXIMUM SUSTAINED WINDS 20 KT GUSTS 30 KT. CONDITIONS 
MERGED WITH TROPICAL STORM IRWIN.
.36 HOUR FORECAST POST-TROPICAL REMNANT LOW HILARY NEAR 27.5N 
133.6W. MAXIMUM SUSTAINED WINDS 15 KT GUSTS 20 KT.
.48 HOUR FORECAST...DISSIPATED.

.E OF LINE FROM 14N96W TO 06N106W TO 03.4S110W...INCLUDING THE 
WATERS BETWEEN ECUADOR AND THE GALAPAGOS ISLANDS...WINDS 20 KT 
OR LESS. SEAS 8 TO 10 FT IN S TO SW SWELL. S OF 02S AND W OF 
117W WINDS 20 KT OR LESS. SEAS 8 FT IN S SWELL.
.24 HOUR FORECAST FROM 00N TO 08N BETWEEN 79W AND 
104W...INCLUDING THE WATERS BETWEEN ECUADOR AND THE GALAPAGOS 
ISLANDS...WINDS 20 KT OR LESS. SEAS 8 TO 9 FT IN S TO SW SWELL. 
S OF LINE FROM 03.4S100W TO 02N118W TO 02N127W WINDS 20 KT OR 
LESS. SEAS 8 FT IN S SWELL.
.48 HOUR FORECAST S OF 04N BETWEEN 92W AND 109W WINDS 20 KT OR 
LESS. SEAS 8 FT IN S SWELL.
 
.12 HOUR FORECAST FROM 21N TO 23N BETWEEN 109W AND 111W WINDS 20 
KT OR LESS. SEAS 8 FT IN MIXED NW WIND WAVES AND S SWELL.
.24 HOUR FORECAST WINDS 20 KT OR LESS. SEAS LESS THAN 8 FT.

.36 HOUR FORECAST LOW PRES 1010 MB NEAR 09N94W. FROM 03N TO 08N 
BETWEEN 91W AND 108W WINDS 20 KT OR LESS. SEAS TO 9 FT IN S TO 
SW SWELL.
.48 HOUR FORECAST LOW PRES 1010 MB NEAR 10N96W. FROM 04N TO 09N 
BETWEEN 92W AND 108W WINDS 20 KT OR LESS. SEAS TO 9 FT IN S TO 
SW SWELL. FROM 12N TO 14N BETWEEN 91W AND 94W WINDS 20 KT OR 
LESS. SEAS 8 FT IN S TO SW SWELL.

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

CONVECTION VALID AT 0300 UTC MON JUL 31...

.TROPICAL STORM IRWIN...SCATTERED MODERATE ISOLATED STRONG 
SE SEMICIRCLE WITHIN 90 NM.

.TROPICAL WAVE FROM 08N93W TO 15N93W. ISOLATED MODERATE FROM 10N 
TO 12N BETWEEN 91W AND 93W.

.TROPICAL WAVE FROM 08N106W TO 18N106W. ISOLATED MODERATE FROM 
14N TO 16N BETWEEN 104W AND 107W.

.INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...
MONSOON TROUGH FROM 10N84W TO 10N115W. OTHER THAN CONVECTION 
ASSOCIATED WITH TROPICAL WAVES...NO SIGNIFICANT CONVECTION.

$$
.FORECASTER MCELROY. NATIONAL HURRICANE CENTER.