High Seas Forecast
Issued by NWS

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FZPN40 PHFO 201528
HSFNP

HIGH SEAS FORECAST
NATIONAL WEATHER SERVICE HONOLULU HI
1700 UTC SAT JAN 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 JAN 20 2018.
24 HOUR FORECAST VALID 1200 UTC JAN 21 2018.
48 HOUR FORECAST VALID 1200 UTC JAN 22 2018.

.WARNINGS.

.NONE.

.SYNOPSIS AND FORECAST.

.FRONT FROM 30N167W TO 28N175W...CONTINUING AS A TROUGH TO 26N180E
TO 22N177E TO 20N165E. FRONT AND TROUGH NEARLY STATIONARY. ISOLATED
MODERATE TSTMS N OF 24N BETWEEN 162W AND 168W...AND FROM 27N TO 21N
BETWEEN 168W AND 179W.
.24 HOUR FORECAST FRONT WEAKENED TO TROUGH FROM 29N173W TO 23N171E.
.48 HOUR FORECAST TROUGH DISSIPATED.

.WEAKENING FRONT FROM 19N140W TO 19N147W TO 21N154W NEARLY
STATIONARY.
.24 HOUR FORECAST FRONT DISSIPATED.

.24 HOUR FORECAST NEW LOW 28N160E. NEW FRONT FROM LOW TO 30N165E. S
TO SW WINDS 20 TO 25 KT WITHIN 120 NM E OF LOW AND FRONT.
.36 HOUR FORECAST LOW 29N165E 1008 MB. FRONT FROM 30N166E TO LOW TO
22N160E. WINDS 20 TO 25 KT WITHIN 180 NM OF LOW AND FRONT N OF 24N.
.48 HOUR FORECAST LOW 29N173E 1007 MB. FRONT FROM 30N175E TO LOW TO
23N167E TO 20N163E. WINDS 20 TO 30 KT N OF 24N W OF 168E. WINDS 20
TO 25 KT WITHIN 300 NM E AND SE QUADRANTS OF LOW.

.24 HOUR FORECAST NEW TROUGH FROM 30N157W TO 26N160W.
.48 HOUR FORECAST TROUGH FROM 30N153W TO 26N158W.

.E WINDS 20 TO 30 KT FROM 06N TO 20N E OF 153W...AND FROM 20N TO 27N
E OF 150W. E WINDS 20 TO 25 KT FROM 22N TO 24N BETWEEN 150W AND
158W...FROM 08N TO 18N BETWEEN 153W AND 165W...AND FROM 08N TO 16N
BETWEEN 165W AND 175E.
.24 HOUR FORECAST E WINDS 20 TO 25 KT FROM 10N TO 24N E OF 150W...
AND FROM 08N TO 18N BETWEEN 150W AND 173W.
.48 HOUR FORECAST E WINDS 20 TO 25 KT FROM 10N TO 20N E OF 152W...
AND FROM 08N TO 16N BETWEEN 152W AND 179W.

.HIGH 29N171E 1017 MB MOVING NE 15 KT. RIDGE FROM 29N176E TO HIGH
TO 29N160E MOVING NE 15 KT.
.24 HOUR FORECAST HIGH MOVED N OF AREA.

.RIDGE FROM 30N146W TO 26N160W TO 25N178W MOVING ESE SLOWLY AND
GRADUALLY ERODING FROM THE W.

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

.SEAS 8 TO 17 FT N OF A LINE FROM 28N178W TO 18N170E TO 18N160E.
SEAS 12 TO 15 FT FROM 14N TO 24N E OF 154W. SEAS 8 TO 12 FT
ELSEWHERE N OF 04N E OF 170W. SEAS 8 TO 10 FT FROM 07N TO 18N
BETWEEN 170W AND 171E. SEAS 8 TO 9 FT N OF 27N BETWEEN 170W AND
178W.
.24 HOUR FORECAST SEAS 12 TO 14 FT N OF A LINE FROM 30N170W TO
24N175W TO 24N177E TO 27N172E. SEAS 8 TO 12 FT N OF 03N E OF
170W...AND ELSEWHERE N OF A LINE FROM 03N170W TO 07N173E TO
13N160E.
.48 HOUR FORECAST SEAS 8 TO 12 FT S OF 27N E OF 150W. SEAS 8 TO 11
FT N OF 03N BETWEEN 150W AND 175E. SEAS 8 TO 10 FT N OF A LINE
FROM 03N175E TO 09N170E TO 09N160E.

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

.ITCZ FROM 07N140W TO 05N160W TO 07N175W TO 06N160E. ISOLATED
MODERATE TSTMS WITHIN 390 NM N OF ITCZ BETWEEN 154W AND 180E...
AND S OF 10N W OF 170E.

$$

.FORECASTER HOUSTON. HONOLULU HI.



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