High Seas Forecast
Issued by NWS

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463
FZPN40 PHFO 251505
HSFNP

HIGH SEAS FORECAST
NATIONAL WEATHER SERVICE HONOLULU HI
1700 UTC TUE JUL 25 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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.

THIS HIGH SEAS FORECAST USES 1-MINUTE AVERAGE WINDS WHICH MAY BE
HIGHER THAN 10-MINUTE AVERAGE WINDS.

SECURITE

NORTH PACIFIC EQUATOR TO 30N BETWEEN 140W AND 160E

SYNOPSIS VALID 1200 UTC JUL 25 2017.
24 HOUR FORECAST VALID 1200 UTC JUL 26 2017.
48 HOUR FORECAST VALID 1200 UTC JUL 27 2017.

.WARNINGS.

...TROPICAL STORM WARNING...
.TYPHOON NORU W OF AREA. ASSOCIATED WINDS 20 TO 35 KT FROM 20N
TO 29N W OF 163E. SEAS 12 TO 18 FT W OF 161E BETWEEN 21N AND 27N.
SEAS 8 TO 12 FT ELSEWHERE W OF 164E FROM 20N TO 30N. SCATTERED
MODERATE TO STRONG TSTMS N OF LINE 23N160E 25N165E 30N161E.
.12 HOUR FORECAST TYPHOON NORU W OF AREA. WINDS 30 TO 40 KT N OF
27N W OF 161E. WINDS 20 TO 30 KT ELSEWHERE W OF LINE 20N160E
25N163E 30N166E. SEAS 12 TO 24 FT W OF 164E N OF 23N. SEAS 8 TO
12 FT ELSEWHERE W OF 167E N OF 18N.
.24 HOUR FORECAST TYPHOON NORU W OF AREA. WINDS 20 TO 30 KT W OF
LINE 20N160E 24N163E 30N165E. SEAS 12 TO 18 FT N OF 27N W OF 164E.
SEAS 8 TO 12 FT N OF 18N W OF 169E.
.48 HOUR FORECAST TYPHOON NORU W OF AREA. ASSOCIATED WINDS 20 TO
30 KT AND SEAS 8 TO 10 FT W OF LINE 20N160E 25N165E 30N164E.

SEE ADVISORY WTPN31 PGTW FROM JTWC FOR ADDITIONAL DETAILS.

.SYNOPSIS AND FORECAST.

.TROUGH 25N162W 20N163W MOVING W 15 KT. WINDS 20 TO 25 KT FROM
22N TO 26N BETWEEN 158W AND 163W. ISOLATED MODERATE TSTMS FROM
21N TO 26N BETWEEN 159W AND 164W.
.24 HOUR FORECAST TROUGH 26N167W 21N171W. ASSOCIATED WINDS
DIMINISHED TO 20 KT OR LESS.
.48 HOUR FORECAST TROUGH DISSIPATED.

.TROUGH 26N163E 25N173E 29N180W NEARLY STATIONARY. SCATTERED
MODERATE TSTMS WITHIN 300 NM S OF TROUGH BETWEEN 172E AND 178E.
ISOLATED MODERATE TSTMS N OF 20N BETWEEN 175W AND 177E.
.24 HOUR FORECAST TROUGH 23N165E 26N177E 30N178E.
.48 HOUR FORECAST TROUGH 23N165E 26N176E 30N175E.

.RIDGE 30N170W 19N174E 15N160E NEARLY STATIONARY.

.36 HOUR FORECAST TROPICAL DEPRESSION GREG NEAR 17.5N 140.5W.
MAXIMUM SUSTAINED WINDS 30 KT GUSTS 40 KT. WINDS 20 KT TO 30
KT FROM 17N TO 22N E OF 144W.
.48 HOUR FORECAST POST-TROPICAL REMNANT LOW GREG NEAR 17.5N
142.0W. MAXIMUM SUSTAINED WINDS 30 KT GUSTS 40 KT. WINDS 20
TO 30 KT FROM 17N TO 22N E OF 145W.
.72 HOUR FORECAST POST-TROPICAL REMNANT LOW GREG NEAR 16.8N
144.7W. MAXIMUM SUSTAINED WINDS 25 KT GUSTS 35 KT.
EXTENDED OUTLOOK...USE FOR GUIDANCE ONLY...ERRORS MAY BE LARGE.
.96 HOUR FORECAST POST-TROPICAL REMNANT LOW GREG NEAR 16.0N
147.5W. MAXIMUM SUSTAINED WINDS 20 KT GUSTS 30 KT.
.120 HOUR FORECAST POST-TROPICAL REMNANT LOW GREG NEAR 15.0N
150.5W. MAXIMUM SUSTAINED WINDS 20 KT GUSTS 30 KT.

SEE ADVISORY WTPZ22 KNHC FROM NHC FOR ADDITIONAL DETAILS.

.SEAS 8 TO 9 FT E OF 148W BETWEEN 08N AND 24N AND FROM 23N TO
25N BETWEEN 157W AND 161W.
.24 HOUR FORECAST SEAS 8 TO 9 FT FROM 08N TO 19N BETWEEN 142W
AND 158W.
.48 HOUR FORECAST SEAS 8 TO 10 FT FROM 10N TO 16N BETWEEN 151W
AND 163W...AND E OF 143W BETWEEN 17N AND 21N.

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

.ITCZ 10N140W 05N160W 03N170W 05N179W 02N175E. ISOLATED MODERATE
TO STRONG TSTMS WITHIN 90 NM OF ITCZ.

.ISOLATED MODERATE TSTMS FROM 09N TO 12N BETWEEN 169E AND 166E.

$$

.FORECASTER POWELL. HONOLULU HI.



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