High Seas Forecast
Issued by NWS

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000
FZPN40 PHFO 180319
HSFNP

HIGH SEAS FORECAST
NATIONAL WEATHER SERVICE HONOLULU HI
0500 UTC MON DEC 18 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 0000 UTC DEC 18 2017.
24 HOUR FORECAST VALID 0000 UTC DEC 19 2017.
48 HOUR FORECAST VALID 0000 UTC DEC 20 2017.

.WARNINGS.

...GALE WARNING...
.FRONT FROM 30N170W TO 21N180W TO 22N171E MOVING E TO 25 KT E OF
180E...NEARLY STATIONARY ELSEWHERE. NE WINDS 30 TO 40 KT N OF A
LINE FROM 30N160W TO 25N177W.  NE TO E WINDS 20 TO 30 KT
ELSEWHERE N OF FRONT.
.24 HOUR FORECAST FRONT FROM 30N155W TO 26N160W TO 23N178E. NE
WINDS 30 TO 35 KT N OF 26N BETWEEN FRONT AND 180W. NE TO E WINDS
20 TO 30 KT ELSEWHERE N OF FRONT.
.48 HOUR FORECAST FRONT FROM 30N150W TO 24N152W TO 21N160W TO
22N178E. NE TO E WINDS 20 TO 30 KT N OF FRONT.

.SYNOPSIS AND FORECAST.SCATTERED

.LOW 26N159W 1010 MB MOVING NNE SLOWLY. TROUGH FROM LOW TO
30N158W AND FROM LOW TO 20N164W. E TO SE WINDS 20 TO 25 KT N OF
22N BETWEEN 149W AND 153W. WIDELY SCATTERED TSTMS WITHIN 12O NM OF
A LINE FROM 20N150W TO 25N153W TO 29N155W.
.24 HOUR FORECAST LOW AND TROUGH MERGED WITH FRONT DESCRIBED
ABOVE. S TO SE WINDS 20 TO 25 KT N OF 28N BETWEEN 148W AN 150W.
.48 HOUR FORECAST S WINDS DIMINISHED TO 20 KT OR LESS.

.FRONT APPROACHING 30N160E MOVING E 20 KT. S WINDS 20 TO 25 KT N
OF 28N W OF 170E.
.24 HOUR FORECAST FRONT FROM 30N170E TO 27N160E. WINDS DIMINISHED
TO 20 KT OR LESS.
.48 HOUR FORECAST FRONT MOVED N OF AREA.

.TROUGH FROM 17N157W TO 10N165W TO 01N174W MOVING W NEAR 10 KT.
SCATTERED MODERATE TSTMS WITHIN 120 NM OF TROUGH BETWEEN 162W AND
170W.
.24 HOUR FORECAST TROUGH FROM 18N151W TO 10N170W TO 01N175W.
.48 HOUR FORECAST TROUGH FROM 16N165W TO 10N172W TO 02N178W.

.DISSIPATING TROUGH 11N145W TO 08N147W MOVING W 10 KT.
.24 HOUR FORECAST TROUGH DISSIPATED.

.NE TO E WINDS 20 TO 25 KT FROM 07N TO 15N W OF 175E.
.24 HOUR FORECAST NE TO E WINDS 20 TO 25 KT FROM 06N TO 20N W OF
172E.
.48 HOUR FORECAST NE TO E WINDS 20 TO 25 KT FROM 08N TO 23N W OF
172E.

.RIDGE FROM 30N173E TO 25N161E...NEARLY STATIONARY AND ERODING
FROM W.

.SEAS 12 TO 20 FT N OF A LINE FROM 30N161W TO 21N176E. SEAS 8 TO
12 FT ELSEWHERE N OF 21N E OF 169E. SEAS 8 TO 9 FT FROM 05N TO 20N
W OF 172W AND FROM 10N TO 15N E OF 148W.
.24 HOUR FORECAST SEAS 12 TO 18 FT N OF A LINE FROM 30N151W TO
20N170E TO 20N175E. SEAS 8 TO 12 FT ELSEWHERE N OF A LINE FROM
30N140W TO 05N160E.
.48 HOUR FORECAST SEAS 12 TO 15 FT N OF A LINE FROM 30N155W TO
20N177W TO 21N175E. SEAS 8 TO 12 FT ELSEWHERE N OF A LINE FROM
22N140W TO 06N160E.

.OTHERWISE WINDS 20 KT OR LESS AND SEAS 8 FT OR LESS OVER REST OF
AREA.

.SCATTERED MODERATE TSTMS S OF 07N BETWEEN W TO 170E.

$$

.FORECASTER MORRISON. HONOLULU HI.


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