High Seas Forecast
Issued by NWS

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FZPN40 PHFO 191045
HSFNP

HIGH SEAS FORECAST
NATIONAL WEATHER SERVICE HONOLULU HI
1100 UTC TUE SEP 19 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 SEP 19 2017.
24 HOUR FORECAST VALID 0600 UTC SEP 20 2017.
48 HOUR FORECAST VALID 0600 UTC SEP 21 2017.

.WARNINGS.

.NONE.

.SYNOPSIS AND FORECAST.

.LOWS 12N157W 1009 MB AND 09N161W 1009 MB MOVING WNW SLOWLY. MONSOON
TROUGH FROM 12N140W TO 11N150W TO FIRST LOW TO 09N161W TO SECOND LOW
TO 06N175W. SCATTERED MODERATE TO STRONG TSTMS FROM 08N TO 10N
BETWEEN 167W AND 169W. ISOLATED MODERATE TO STRONG TSTMS ELSEWHERE
WITHIN 180 NM OF TROUGH.
.24 HOUR FORECAST LOWS 12N159W 1010 MB AND 11N168W 1009 MB.
.48 HOUR FORECAST LOWS 12N160W 1012 MB AND 12N170W 1011 MB.

.FRONT FROM 30N179W TO 27N175E TO 25N163E TO 26N160E MOVING ESE 15
KT E OF 173E AND MOVING S SLOWLY AND WEAKENING ELSEWHERE. ISOLATED
MODERATE TSTMS WITHIN 60 NM S OF FRONT.
.24 HOUR FORECAST FRONT FROM 30N172W TO 24N180W TO 22N174E TO
24N160E.
.48 HOUR FORECAST WEAKENING FRONT FROM 30N170W TO 23N180W TO 21N167E.

.TROUGH FROM 26N177W TO 24N178W TO 22N179W NEARLY STATIONARY.
ISOLATED MODERATE TSTMS WITHIN 120 NM OF TROUGH.
.24 HOUR FORECAST TROUGH DISSIPATED.

.TROUGH FROM 24N176E TO 22N172E TO 20N170E MOVING E SLOWLY. ISOLATED
MODERATE TSTMS FROM 20N TO 23N BETWEEN 160E AND 177E.
.24 HOUR FORECAST TROUGH MERGED WITH FRONT DESCRIBED ABOVE.

.TROUGH FROM 13N166E TO 07N171E TO 03N173E MOVING SE SLOWLY.
ISOLATED MODERATE TSTMS S OF 17N W OF 174E...AND FROM 04N TO 14N
BETWEEN 174E AND 176W.
.24 HOUR FORECAST TROUGH FROM 13N164E TO 06N168E TO 02N169E.
.48 HOUR FORECAST TROUGH W OF AREA.

.RIDGE FROM 30N165W TO 25N170W TO 22N176W NEARLY STATIONARY.

.WINDS 20 KT OR LESS ENTIRE FORECAST AREA.

.SEAS 8 TO 9 FT N OF 29N BETWEEN 165E AND 176E.
.24 HOUR FORECAST SEAS 8 TO 10 FT N OF A LINE FROM 30N176W TO
24N173E TO 24N160E.
.48 HOUR FORECAST SEAS 8 TO 9 FT IN AREA BOUNDED BY 30N178W 30N172W
24N179W 21N169E 24N160E 30N178W.

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

$$

.HONOLULU HI.



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