High Seas Forecast
Issued by NWS

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FZPN40 PHFO 201529
HSFNP

HIGH SEAS FORECAST
NATIONAL WEATHER SERVICE HONOLULU HI
1700 UTC TUE FEB 20 2018

SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 FEB 20 2018.
24 HOUR FORECAST VALID 1200 UTC FEB 21 2018.
48 HOUR FORECAST VALID 1200 UTC FEB 22 2018.

.WARNINGS.

...GALE WARNING...
.LOW 26N157W 1011 MB MOVING NW 10 KT. TROUGH FROM 30N159W TO LOW
TO 20N154W MOVING W SLOWLY. WINDS 25 TO 40 KT WITHIN 360 NM E OF
LOW AND TROUGH N OF 23N. WINDS 20 TO 30 KT ELSEWHERE E OF LOW AND
TROUGH. ISOLATED MODERATE TSTMS WITHIN 210 NM E OF LOW AND
TROUGH...AND FROM 16N TO 28N BETWEEN 145W AND 150W.
.24 HOUR FORECAST LOW 28N160W 1013 MB. TROUGH FROM 30N162W TO LOW
TO 20N156W. WINDS 20 TO 30 KT E OF A LINE FROM 30N160W TO 28N159W
25N150W TO 20N144W.
.48 HOUR FORECAST LOW MOVED N OF AREA. TROUGHS FROM LOW TO 30N164W
TO 26N163W...AND FROM 27N159W TO 20N158W. WINDS 20 TO 30 KT E OF A
LINE FROM 30N156W TO 20N154W.

.SYNOPSIS AND FORECAST.

.FRONT FROM 30N179W TO 25N177E TO 17N160E NEARLY STATIONARY.
ISOLATED MODERATE TSTMS N OF 27N BETWEEN 176W AND 180E...AND WITHIN
60 NM W OF FRONT N OF 29N.
.24 HOUR FORECAST FRONT WEAKENED TO TROUGH FROM 30N179W TO 23N179W.
.48 HOUR FORECAST TROUGH FROM 30N179E TO 24N179E.

.TROUGH FROM 12N167W TO 05N171W MOVING W SLOWLY.
.24 HOUR FORECAST TROUGH DISSIPATED.

.E TO SE WINDS 20 TO 30 KT FROM 10N TO 20N E OF 150W.
.24 HOUR FORECAST E WINDS 20 TO 25 KT E OF A LINE FROM 12N147W TO
TO 16N146W TO 20N144W.
.48 HOUR FORECAST E WINDS 20 TO 25 KT E OF A LINE FROM 12N148W TO
20N154W.

.48 HOUR FORECAST NEW FRONT FROM 30N162E TO 29N160E.

.RIDGE FROM 30N143W TO 21N150W NEARLY STATIONARY.

.RIDGE FROM 30N173W TO 21N180E MOVING W SLOWLY.

.RIDGE FROM 30N166E TO 26N160E MOVING E 15 KT.

.OTHERWISE...WINDS 20 KT OR LESS OVER REMAINDER OF FORECAST AREA.

.SEAS 12 TO 16 FT N OF A LINE FROM 30N178W TO 23N170E TO 22N163E.
SEAS 12 TO 15 FT WITHIN 150 NM OF A LINE FROM 28N155W TO 23N152W.
SEAS 8 TO 12 FT ELSEWHERE N OF LINES FROM 30N165W TO 17N172W TO
10N160E...AND FROM 08N140W TO 08N148W TO 30N161W.
.24 HOUR FORECAST SEAS 12 TO 14 FT N OF 28N BETWEEN 154W AND 163W.
SEAS 8 TO 12 FT ELSEWHERE N OF A LINE FROM 12N140W TO 12N150W TO
22N156W TO 22N162W TO 09N172W TO 09N170E. SEAS 8 TO 9 FT FROM 10N
TO 24N W OF 170E.
.48 HOUR FORECAST SEAS 8 TO 12 FT N OF A LINE FROM 09N140W TO
13N150W TO 23N160W. SEAS 8 TO 10 FT N OF A LINE FROM 23N160W TO
09N173W. SEAS 8 TO 10 FT FROM 08N TO 21N BETWEEN 173W AND 170E.

.OTHERWISE...SEAS 8 FT OR LOWER OVER REMAINDER OF FORECAST AREA.

.SCATTERED MODERATE TO LOCALLY STRONG TSTMS S OF 08N W OF 168E.
ISOLATED MODERATE TSTMS S OF 08N BETWEEN 180E AND 170E.

.ITCZ FROM 08N140W TO 10N164W. SCATTERED MODERATE TO STRONG TSTMS
FROM 07N TO 11N BETWEEN 160W AND 164W.

$$

.FORECASTER HOUSTON. HONOLULU HI.



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