High Seas Forecast
Issued by NWS

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FZPN40 PHFO 172200
HSFNP

HIGH SEAS FORECAST
NATIONAL WEATHER SERVICE HONOLULU HI
2300 UTC THU AUG 17 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 1800 UTC AUG 17 2017.
24 HOUR FORECAST VALID 1800 UTC AUG 18 2017.
48 HOUR FORECAST VALID 1800 UTC AUG 19 2017.

.WARNINGS.

.NONE.

.SYNOPSIS AND FORECAST.

.LOW 12N149W 1009 MB NEARLY STATIONARY. TROUGH 12N140W 13N144W
THROUGH LOW TO 08N160W. ISOLATED MODERATE TSTMS WITHIN 240 NM S OF
TROUGH E OF 144W.
.24 HOUR FORECAST LOW 13N147W 1009 MB. TROUGH 14N140W THROUGH LOW TO
08N156W.
.48 HOUR FORECAST LOW 15N148W 1010 MB. TROUGH 12N140W THROUGH LOW TO
09N151W.

.TROUGH 12N167W 07N173W MOVING W 10 KT. NE WINDS 20 TO 25 KT FROM 15N
TO 13N BETWEEN 166W AND 170W. SEAS 8 FT. ISOLATED MODERATE TSTMS
WITHIN 120 NM OF LINE 06N160W 14N168W.
.24 HOUR FORECAST TROUGH 12N172W 07N175W. NE WINDS 20 TO 25 KT FROM
15N TO 13N BETWEEN 170W AND 174W. SEAS 8 FT.
.48 HOUR FORECAST 13N177W 07N179W. WINDS DIMINISHED TO 20 KT OR LESS.
SEAS LESS THAN 8 FT.

.ITCZ 08N174W 05N170E 05N160E. ISOLATED MODERATE TSTMS WITHIN 90 NM OF
ITCZ.

.RIDGE 30N173E 27N160E MOVING NW SLOWLY.

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

.SCATTERED STRONG TSTMS W OF LINE 17N160E 13N163E 10N160E.

$$
.HONOLULU FORECASTER.



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