High Seas Forecast
Issued by NWS

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000
FZPN40 PHFO 171120
HSFNP

HIGH SEAS FORECAST
NATIONAL WEATHER SERVICE HONOLULU HI
1100 UTC TUE OCT 17 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 17 2017.
24 HOUR FORECAST VALID 0600 UTC OCT 18 2017.
48 HOUR FORECAST VALID 0600 UTC OCT 19 2017.

.WARNINGS.

...GALE WARNING...
.NE TO E WINDS 25 TO 35 KT AROUND 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.

.TROUGH FROM 17N160E TO 19N165E TO 24N170E MOVING NW 10 KT.
WINDS E 20 TO 25 KT AND SEAS 8 TO 9 FT OVER FORECAST WATERS N
OF 19N W OF TROUGH AXIS.  SCATTERED STRONG TSTMS WITHIN 180 NM
EITHER SIDE OF TROUGH AXIS. ISOLATED MODERATE TO STRONG TSTMS
ELSEWHERE FORM 27N TO 02N W OF 171E.
.24 HOUR FORECAST TROUGH FROM 23N160E TO 25N168E. WINDS SE TO
E 20 TO 30 KT AND SEAS 8 TO 9 FT WITHIN 240 NM N OF TROUGH AXIS.
.48 HOUR FORECAST TROUGH FROM 26N160E TO 25N166E. WINDS SE TO E
20 TO 25 KT AND SEAS 8 TO 9 FT WITHIN 120 NM N OF TROUGH AXIS.

.TROUGH FROM 25N140W TO 28N141W TO 30N141W MOVING SW SLOWLY.
.24 HOUR FORECAST TROUGH FROM 19N141W TO 25N142W TO 30N143W.
.48 HOUR FORECAST TROUGH FROM 15N143W TO 21N140W TO 27N143W.

.OTHERWISE...IN ADDITION TO GALE AREA DESCRIBED IN WARNING SECTION
ABOVE...WINDS E TO NE E 20 TO 30 KT WITHIN A POLYGON BOUNDED BY
30N176E 30N145W 22N152W 16N149W 10N157W 13N172W 19N171W 30N176E.
.24 HOUR FORECAST...IN ADDITION TO GALE AREA DESCRIBED IN
WARNING SECTION ABOVE...WINDS NE TO E 20 TO 30 KT WITHIN A POLYGON
BOUND BY 30N175E 30N147W 22N152W 13N148W 10N158W 10N171W 15N179W
30N175E.
.48 HOUR FORECAST...IN ADDITION TO GALE AREA DESCRIBED IN
WARNING SECTION ABOVE...WINDS NE TO E 20 TO 30 KT WITHIN A POLYGON
BOUND BY 28N175E 30N150W 16N150W 09N158W 12N178E 28N175E.

.WINDS 20 KT OR LESS REMAINDER FORECAST AREA.

.SEAS 8 TO 12 FT WITHIN A POLYGON BOUND BY 30N175E 30N145W 13N148W
18N160W 14N176W 24N175E 30N175E.
.24 HOUR FORECAST SEAS 8 TO 12 FT WITHIN A POLYGON BOUND BY 30N172E
30N165W 26N156W 30N146W 13N149W 07N161W 13N178E 24N172W 30N172E.
.48 HOUR FORECAST SEAS 8 TO 12 FT WITHIN A POLYGON BOUND BY 30N170E
30N160W 25N146W 05N153W 10N179W 20N173E 30N170E.

.SEAS 8 FT OR LOWER REMAINDER FORECAST AREA.

.ITCZ FROM 12N140W 18N150W 10N165W 08N178E 11N171E. ISOLATED
MODERATE TO STRONG TSTMS WITHIN 480 NM N OF LINE OF CONVERGENCE...
AND ALSO WITHIN 240 NM S OF LINE OF CONVERGENCE.

.OTHERWISE SCATTERED MODERATE TSTMS FROM 25N TO 18N BETWEEN 179W
AND 165W.

$$

.FORECASTER BEDAL. HONOLULU HI.



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