High Seas Forecast
Issued by NWS

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FZPN40 PHFO 261531
HSFNP

HIGH SEAS FORECAST
NATIONAL WEATHER SERVICE HONOLULU HI
1700 UTC TUE SEP 26 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 SEP 26 2017.
24 HOUR FORECAST VALID 1200 UTC SEP 27 2017.
48 HOUR FORECAST VALID 1200 UTC SEP 28 2017.

.WARNINGS.

.NONE.

.SYNOPSIS AND FORECAST.

.LOW ALONG MONSOON TROUGH NEAR 11N145W 1010 MB NEARLY STATIONARY.
ASSOCIATED TSTMS INCLUDED WITH MONSOON TROUGH AND ITCZ DESCRIBED BELOW.
.24 HOUR FORECAST LOW DISSIPATED.

.COLD FRONT FROM 30N161W TO 28N165W TO 27N171W MOVING ESE 15 KT.
.24 HOUR FORECAST FRONT FROM 30N157W TO 27N163W TO 25N170W.
.48 HOUR FORECAST FRONT FROM 30N150W TO 28N156W TO 24N169W.

.COLD FONT JUST W OF FORECAST AREA NEAR 3TNE0N156E MOVING ENE 25 KT.
WINDS INCREASING TO SW 20 TO 30 KT N OF 27N W OF 172E. SEAS BUILDING TO
8 TO 10 FT NW OF A LINE FROM 30N164E TO 28N160E. ISOLATED MODERATE
TO STRONG TSTMS NW OF A LINE FROM 30N162E TO 28N160E.
.24 HOUR FORECAST FRONT FROM 30N164E TO 28N160E. WINDS SW 20 TO 25 KT
N OF 29N BETWEEN 165E AND 175E. SEAS 8 TO 11 FT NW OF A LINE FROM 30N170E
TO 28N160E.
.48 HOUR FORECAST FRONT FROM 30N174E TO 28N168E TO 26N160E. ASSOCIATED
WINDS DIMINISHED TO 20 KT OR LESS. ASSOCIATED SEAS SUBSIDED TO 8 FT
OR LOWER.

.TROUGH FROM 18N150W TO 21N154W TO 25N155W MOVING NNW SLOWLY.
.12 HOUR FORECAST TROUGH DISSIPATED.

.HIGH NEAR 26N179W 1017 MB MOVING ENE 15 KT. RIDGES FROM HIGH TO 21N166W
AND FROM HIGH TO 21N160E.
.24 HOUR FORECAST HIGH NEAR 28N177W 1018 MB. RIDGE FROM HIGH TO 25N171E
TO 21N160E.
.48 HOUR FORECAST DISSIPATING HIGH NEAR 28N172W 1018 MB. RIDGE FROM
HIGH TO 27N175E.

.RIDGE FROM 30N143W TO 26N151W.
.24 HOUR FORECAST RIDGE FROM 30N143W TO 28N148W.
.48 HOUR FORECAST RIDGE FLATTENED OVER FORECAST AREA.

.WINDS 20 KT OR LESS REMAINDER FORECAST AREA.

.SEAS 8 FT OR LOWER REMAINDER FORECAST AREA.

.MONSOON TROUGH FROM 11N140W TO 11N145W TO 09N155W TO 11N163W THENCE
AND ITCZ TO 12N172W TO 10N179E TO 12N169E TO 11N160E. SCATTERED MODERATE
TO STRONG TSTMS WITHIN 360 NM EITHER SIDE OF ITCZ BETWEEN 163W AND 177W.
ISOLATED MODERATE TSTMS WITHIN 240 NM EITHER SIDE OF ITCZ W OF 177W. ALSO
ISOLATED MODERATE TO STRONG TSTMS WITHIN 120 NM EITHER SIDE OF MONSOON
TROUGH AXIS.

$$

.FORECASTER BEDAL. HONOLULU HI.



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