High Seas Forecast
Issued by NWS

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000
FZPN40 PHFO 181021
HSFNP

HIGH SEAS FORECAST
NATIONAL WEATHER SERVICE HONOLULU HI
1100 UTC WED OCT 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 0600 UTC OCT 18 2017.
24 HOUR FORECAST VALID 0600 UTC OCT 19 2017.
48 HOUR FORECAST VALID 0600 UTC OCT 20 2017.

.WARNINGS.

...GALE WARNING...
.NE TO E WINDS 25 TO 35 KT WITH SOME OF THE CHANNELS WITHIN THE
MAIN HAWAIIAN ISLANDS. FOR DETAILS SEE COASTAL WATERS FORECAST
ISSUED BY NWS HONOLULU FORECAST OFFICE UNDER AWIPS HEADER
HFOCWFHFO AND WMO HEADER FZHW50 PHFO.
.24 HOUR FORECAST LITTLE CHANGE.
.48 HOUR FORECAST LITTLE CHANGE.

.SYNOPSIS AND FORECAST.

.LOW NEAR 22N160E 1006 MB NEARLY STATIONARY. E WINDS 20 TO 25 KT
SEAS 8 TO 10 FT BETWEEN 23N AND 26N W OF 165E.
.24 HOUR FORECAST LOW 24N158E 1006 MB. E WINDS 20 TO 25 KT SEAS 8
TO 10 FT BETWEEN 26N AND 28N W OF 165E.
.48 HOUR FORECAST LOW DISSIPATED W OF FORECAST AREA. WINDS
DIMINISHED TO 20 KT OR LESS. SEAS 8 TO 9 FT N OF 27N W OF 163E.

.TROUGH 30N143W TO 23N140W NEARLY STATIONARY...DISSIPATING.
ISOLATED TSTMS WITHIN 160 NM OF TROUGH.
.24 HOUR FORECAST TROUGH DISSIPATED.

.TROUGH 16N140W TO 10N142W MOVING WNW NEAR 10 KT.
.24 HOUR FORECAST TROUGH 23N140W TO 15N145W. BECOMING STATIONARY.
.48 HOUR FORECAST TROUGH NO CHANGE...DISSIPATING.

.TROUGH 28N175E TO 22N180W TO 19N176W MOVING W SLOWLY.
SCATTERED TSTMS WITHIN 220 NM E OF TROUGH.
.24 HOUR FORECAST TROUGH DISSIPATED.

.ELSEWHERE NE TO E WINDS 20 TO 30 KT N OF 10N BETWEEN 150W AND A
LINE FROM 30N173E TO 10N174W.
.24 HOUR FORECAST MAINLY E WINDS 20 TO 30 KT N OF 10N BETWEEN 150W
AND 174E.
.48 HOUR FORECAST NE TO E WINDS 20 TO 30 KT IN THE AREA BOUNDED BY
30N140W 24N140W 10N151W 10N178E 22N178E 30N153W 30N140W.

.ELSEWHERE SEAS 8 TO 12 FT IN THE AREA BOUNDED BY 30N150W 10N150W
10N176W 30N171E 30N140W WITHIN 540 NM EITHER SIDE OF A LINE FROM
30N175W  TO 10N160W. SEAS 8 TO 10 FT FROM 20N TO 26N W OF 167W.
.24 HOUR FORECAST SEAS 8 TO 12 FT IN THE AREA BOUNDED BY 30N165W
10N150W 10N180W 30N170E 30N165W.
.48 HOUR FORECAST SEAS 12 TO 15 FT N OF 25N E OF 153W. SEAS 8 TO
12 FT ELSEWHERE N OF 10N AND BETWEEN 170E AND A LINE FROM 25N140W
TO 10N155W. SEAS 8 TO 9 FT S OF 10N BETWEEN 160W AND 170W.

.REMAINDER OF AREA WINDS 20 KT OR LESS. SEAS 8 FT OR LESS.

ITCZ 10N146W TO 08N160W TO 08N170W...THENCE MONSOON TROUGH TO
09N167E TO 10N163E. SCATTERED MODERATE TO STRONG TSTMS WITHIN 280
NM N OF ITCZ BETWEEN 155W AND 170W. ISOLATED MODERATE TO STRONG
TSTMS WITHIN 240 NM OF MONSOON TROUGH.

$$

.FORECASTER LAU. HONOLULU HI.



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