High Seas Forecast
Issued by NWS

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000
FZPN40 PHFO 202239
HSFNP

HIGH SEAS FORECAST
NATIONAL WEATHER SERVICE HONOLULU HI
2300 UTC FRI OCT 20 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 OCT 20 2017.
24 HOUR FORECAST VALID 1800 UTC OCT 21 2017.
48 HOUR FORECAST VALID 1800 UTC OCT 22 2017.

.WARNINGS.

...GALE WARNING...
.NE TO E WINDS 30 TO 35 KT IN SOME OF THE CHANNELS WITHIN THE
MAIN HAWAIIAN ISLANDS. FOR DETAILS SEE COASTAL WATERS FORECAST
ISSUED BY NWS HONOLULU FORECAST OFFICE UNDER AWIPS HEADER
HFOCWFHFO AND WMO HEADER FZHW50 PHFO.
.12 HOUR FORECAST NE TO E WINDS EASED BELOW GALE FORCE.

.SYNOPSIS AND FORECAST.

.DEVELOPING COLD FRONT APPROACHING FORECAST AREA FROM N.
.48 HOUR FORECAST FRONT FROM 30N171W TO 28N178E TO 29N170E. WINDS
SW TO NW 20 TO 25 KT N OF 28N BETWEEN 178E AND 160W.

.TROUGH FROM 18N146W TO 21N144W TO 24N140W MOVING NW 10 KT.
.24 HOUR FORECAST TROUGH FROM 21N149W TO 27N144W.
.48 HOUR FORECAST TROUGH DISSIPATED.

.TROUGH FROM 28N160E TO 27N165E MOVING NW 10 KT. ISOLATED MODERATE TO
STRONG TSTSM N OF 17N W OF 171E.
.24 HOUR FORECAST TROUGH FROM 29N160E TO 30N163E.
.48 HOUR FORECAST TROUGH N OF FORECAST AREA.

.RIDGE BUILDING OVER FORECAST AREA.
.24 HOUR FORECAST RIDGE FROM 30N161W TO 28N176W TO 27N169E.
.48 HOUR FORECAST RIDGE FROM 30N141W TO 27N158W TO 24N172W.

.OTHERWISE AND ELSEWHERE...WINDS NE TO E 20 TO 30 KT FROM 24N TO
13N BETWEEN 170W AND 152W.
.24 HOUR FORECAST WINDS NE TO E 20 TO 25 KT FROM 22N TO 11N
BETWEEN 173W AND 155W.
.48 HOUR FORECAST WINDS DIMINISHED TO 20 KT OR LESS.

.WINDS 20 KT OR LESS REMAINDER FORECAST AREA.

.SEAS 8 TO 13 FT WITHIN A POLYGON BOUND BY 30N154W 30N140W 20N140W
15N154W 08N154W 08N167W 10N179E 16N171E 24N177E 26N169W 30N154W.
ALSO SEAS 8 TO 9 FT N OF 27N W OF 179E.
.24 HOUR FORECAST SEAS 8 TO 11 WITHIN A POLYGON BOUND BY 30N160E
30N165W 28N152W 30N140W 10N140W 06N170W 18N160E 30N160E.
.48 HOUR FORECAST SEAS 8 TO 11 FT WITHIN A POLYGON BOUND BY 30N160E
30N140W 08N140W 17N160W 17N160E 30N160E.

.SEAS 8 FT OR LOWER REMAINDER FORECAST AREA.

.ITCZ FROM 10N140W TO 11N145W TO 07N155W TO 06N162W TO 08N169W TO
07N178W TO 11N175E. SCATTERED STRONG TSTMS WITHIN 240 NM N OF
CONVERGENCE LINE BETWEEN 145W AND 169W. ISOLATED MODERATE TO STRONG
TSTMS ELSEWHERE WITHIN 360 NM EITHER SIDE OF CONVERGENCE LINE.

.TROPICAL WAVE 07N163E TO 14N169E MOVING WNW 15 KT. SCATTERED STRONG
TSTMS FROM 14N TO 06N W OF 169E. ISOLATED MODERATE TO STRONG TSTMS
ELSEWHERE FROM 17N TO 03N W OF 175E.

.OTHERWISE SCATTERED MODERATE TSTMS FROM 19N TO 12N BETWEEN 175E AND
175W.

$$

.FORECASTER BEDAL. HONOLULU HI.



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