High Seas Forecast
Issued by NWS

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000
FZPN40 PHFO 181538
HSFNP

HIGH SEAS FORECAST
NATIONAL WEATHER SERVICE HONOLULU HI
1700 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 1200 UTC DEC 18 2017.
24 HOUR FORECAST VALID 1200 UTC DEC 19 2017.
48 HOUR FORECAST VALID 1200 UTC DEC 20 2017.

.WARNINGS.

...GALE WARNING...
.FRONT FROM 30N156W TO 26N162W TO 17N177E TO 18N170E. PART OF FRONT
W OF 175W MOVING S 10 KT. REST OF FRONT MOVING E SLOWLY. NE WINDS 25
TO 40 KT N OF 23N BETWEEN FRONT AND 178E. NE TO E WINDS 20 TO 30 KT
ELSEWHERE N OF FRONT.
.24 HOUR FORECAST FRONT FROM 30N155W TO 25N159W TO 23N180W. NE TO E
WINDS 20 TO 30 KT N OF FRONT. FRONT MERGING WITH A LOW N OF FORECAST
WATERS. SEE LOW BELOW.
.48 HOUR FORECAST FRONT FROM 30N147W TO 25N150W TO 21N160W TO
19N180W. WINDS 20 TO 25 KT N OF 28N E OF 160W. NE TO E WINDS 20 TO
25 KT WITHIN 120 NM N OF FRONT W OF 160W.

.SYNOPSIS AND FORECAST.SCATTERED

.LOW NEAR 25N160W 1010 MB MOVING NNE 10 KT...THEN TO 20 KT AFT 1800
UTC. TROUGH FROM LOW TO 30N156W AND FROM LOW TO 22N162W. SE TO S
WINDS 20 TO 25 KT N OF 23N BETWEEN 149W AND 153W. ISOLATED TSTMS N
OF 20N BETWEEN 145W AND 155W.
.24 HOUR FORECAST LOW MOVED N OF FORECAST WATERS AND MERGING WITH
FRONT DESCRIBED ABOVE. WINDS DIMINISHED TO 20 KT OR LESS. PLEASE
REFER TO FRONT DESCRIBED ABOVE.

.FRONT FROM 30N166E TO 27N160E. N END OF FRONT MOVING E 20 KT.
W END NEARLY STATIONARY. NE WINDS 20 TO 25 KT N OF FRONT.
.24 HOUR FORECAST FRONT FROM 30N169E TO 28N160E...MOVING N AS A
WARM FRONT. WINDS DIMINISHED TO 20 KT OR LESS N OF FRONT.
.36 HOUR FORECAST FRONT MOVED N OF AREA.

.TROUGH FROM 21N156W TO 13N165W TO 02N175W MOVING W NEAR 10 KT.
SCATTERED MODERATE TSTMS WITHIN 200 NM OF TROUGH BETWEEN 10N AND
05N.
.24 HOUR FORECAST TROUGH FROM 20N160W TO 14N170W TO 03N178W.
.48 HOUR FORECAST TROUGH FROM 20N160W TO 14N170W TO 03N178W.

.TROUGH FROM 13N147W TO 07N149W MOVING W SLOWLY.
.24 HOUR FORECAST TROUGH FROM 13N150W TO 08N153W.
.48 HOUR FORECAST TROUGH FROM 14N153W TO 08N157W.

.TROUGH 02N160E TO 00N172E NEARLY STATIONARY. ISOLATED MODERATE
TSTMS S OF A LINE FROM 02N180W TO 08N160E.
.24 HOUR FORECAST TROUGH NO SIGNIFICANT CHANGE.
.48 HOUR FORECAST TROUGH NO SIGNIFICANT CHANGE.

.RIDGE FROM 30N144W TO 26N149W MOVING S SLOWLY.

.RIDGE FROM 30N172E TO 27N164E...NEARLY STATIONARY AND ERODING
FROM W.

.NE TO E WINDS 20 TO 25 KT FROM 05N TO 15N W OF 175E.
.12 HOUR FORECAST NE WINDS 20 TO 25 KT IN THE AREA BETWEEN 22N AND
06N W OF LINE FROM 22N180W TO 06N170E.
.24 HOUR FORECAST NE TO E WINDS 20 TO 25 KT W OF A LINE FROM
22N180W TO 06N166E.
.48 HOUR FORECAST NE TO E WINDS 20 TO 25 KT BETWEEN 25N AND A LINE
FROM 25N157W TO 14N180W TO 06N160E.

.SEAS 12 TO 21 FT N OF A LINE FROM 30N157W TO 24N170W TO 20N177E.
SEAS 8 TO 12 FT ELSEWHERE N OF A LINE FROM 30N150W TO 20N170W TO
16N170E. SEAS 8 TO 10 FT ELSEWHERE N OF 22N BETWEEN 144W AND 155W.
SEAS 8 TO 9 FT BETWEEN 19N AND 06N W OF 180W.
.24 HOUR FORECAST SEAS 12 TO 14 FT N OF A LINE FROM 30N151W TO
25N160W TO 19N173E. SEAS 8 TO 12 FT ELSEWHERE N OF A LINE FROM
30N143W TO 20N160W TO 13N180W TO 10N160E.
.48 HOUR FORECAST SEAS 12 TO 17 FT N OF A LINE FROM 30N150W TO
26N157W TO 30N166W. SEAS 8 TO 12 FT ELSEWHERE N OF A LINE FROM
30N144W TO 21N153W TO 12N180W TO 10N160E.

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

.ITCZ FROM 10N140W TO 10N145W. ISOLATED TSTMS WITHIN 120 NM OF
ITCZ.


$$

.FORECASTER LAU. HONOLULU HI.


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