High Seas Forecast
Issued by NWS

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000
FZPN40 PHFO 200330
HSFNP

HIGH SEAS FORECAST
NATIONAL WEATHER SERVICE HONOLULU HI
0500 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 0000 UTC FEB 20 2018.
24 HOUR FORECAST VALID 0000 UTC FEB 21 2018.
48 HOUR FORECAST VALID 0000 UTC FEB 22 2018.

.WARNINGS.

...GALE WARNING...
.TROUGH FROM 30N159W TO 21N159W MOVING W SLOWLY. SE TO E WINDS 20 TO
30 KT E OF A LINE FROM 11N144W TO 27N157W...AND E OF TROUGH N OF
27N. ISOLATED MODERATE TSTMS N OF 17N E OF 159W.
.24 HOUR FORECAST NEW LOW 27N160W 1011 MB. TROUGH FROM 30N162W TO
LOW TO 21N159W. SE TO E WINDS 25 TO 35 KT N OF 27N BETWEEN 153W AND
160W. WINDS 20 TO 30 KT ELSEWHERE E OF A LINE FROM 12N146W TO
25N154W TO 28N161W TO 30N161W.
.48 HOUR FORECAST LOW 29N163W 1014 MB. TROUGH FROM 30N165W TO LOW TO
25N162W. ANOTHER TROUGH FROM 24N156W TO 20N155W. SE TO E WINDS 20 TO
30 KT E OF A LINE FROM 11N146W TO 28N156W...AND N OF 28N E OF 163W.

.SYNOPSIS AND FORECAST.

.FRONT FROM 30N178E TO 25N175E TO 21N167E TO 19N160E MOVING E 15 KT
N OF 24N AND MOVING S SLOWLY ELSEWHERE. WINDS 20 TO 25 KT WITHIN 60
NM W OF FRONT N OF 23N. ISOLATED MODERATE TSTMS WITHIN 90 NM OF
FRONT N OF 25N.
.24 HOUR FORECAST FRONT FROM 30N178W TO 27N177W TO 20N164E. WINDS
DIMINISHED TO 20 KT OR LESS.
.48 HOUR FORECAST FRONT WEAKENED TO A TROUGH FROM 30N178W TO 27N175W
TO 24N178W.

.TROUGH FROM 02N160E TO 00N166E NEARLY STATIONARY. ISOLATED MODERATE
TO STRONG TSTMS S OF 10N W OF 180E.
.24 HOUR FORECAST TROUGH DISSIPATED.

.RIDGE FROM 28N160E TO 28N169E MOVING N SLOWLY.

.RIDGE FROM 30N172W TO 26N175W TO 23N179E NEARLY STATIONARY AND
ERODING FROM W.

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

.SEAS 12 TO 17 FT N OF A LINE FROM 30N175W TO 23N178E TO 24N160E.
SEAS 8 TO 12 FT ELSEWHERE N OF A LINE FROM 30N172W TO 25N176W TO
15N166E TO 14N160E. SEAS 8 TO 12 FT E OF A LINE FROM 10N147W TO
16N159W TO 30N159W.
.24 HOUR FORECAST SEAS 12 TO 15 FT N OF 27N BETWEEN 151W AND 159W.
SEAS 8 TO 13 FT ELSEWHERE N OF A LINE FROM 09N140W TO 09N148W TO
25N161W TO 23N166W TO 13N173W TO 08N160E...EXCEPT SEAS 8 FT OR LESS
W OF A LINE FROM 30N164E TO 25N160E.
.48 HOUR FORECAST SEAS 8 TO 12 FT N OF A LINE FROM 10N140W TO
10N146W TO 22N157W TO 22N163W TO 16N166W TO 10N174W TO 08N177E. SEAS
8 TO 10 FT IN AREA BOUNDED BY 30N177E 08N177E 14N163E 26N175E
30N177E.

.SEAS 8 FT OR LESS OVER REMAINDER OF FORECAST AREA.

.ITCZ FROM 08N140W TO 09N147W TO 08N157W TO 10N163W TO 09N169W.
ISOLATED MODERATE TSTMS FROM 09N TO 15N E OF 150W...AND ELSEWHERE
WITHIN 60 NM OF ITCZ.

$$

.HONOLULU HI.


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