High Seas Forecast
Issued by NWS

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000
FZPN40 PHFO 182230
HSFNP

HIGH SEAS FORECAST
NATIONAL WEATHER SERVICE HONOLULU HI
2300 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 1800 UTC DEC 18 2017.
24 HOUR FORECAST VALID 1800 UTC DEC 19 2017.
48 HOUR FORECAST VALID 1800 UTC DEC 20 2017.

.WARNINGS.

...GALE WARNING...
.FRONT 30N156W 26N162W 24N175W MOVING ESE 10 KT. WINDS 20 TO 35 KT
N OF FRONT. SEE SEAS BELOW.
.24 HOUR FORECAST FRONT 30N151W 24N156W 24N173W. WINDS 20 TO 30 KT
N OF FRONT. SEE SEAS BELOW.
.48 HOUR FORECAST FRONT 30N146W 25N150W 19N164W. WINDS 20 TO 25 KT
N OF 29N E OF 163W. SEE SEAS BELOW.

.SYNOPSIS AND FORECAST.

.FRONT 30N168E 26N160E MOVING E 15 KT NEAR 30N AND NEARLY STATIONARY
ELSEWHERE. WINDS 20 TO 30 KT N OF FRONT. SEE SEAS BELOW.
.24 HOUR FORECAST FRONT MOVED N OF AREA.

.TROUGH 18N158W 11N167W 02N177W MOVING W NEAR 10 KT. ISOLATED
MODERATE TSTMS WITHIN 120 NM OF TROUGH.
.24 HOUR FORECAST TROUGH 18N159W 11N170W 03N178W.
.48 HOUR FORECAST TROUGH 16N161W 05N178W.

.TROUGH 13N148W 07N153W MOVING W SLOWLY.
.24 HOUR FORECAST TROUGH 13N150W 08N156W.
.48 HOUR FORECAST NEW LOW 11N155W 1011 MB.

.TROUGH 02N160E 00N169E NEARLY STATIONARY. ISOLATED MODERATE
TSTMS S OF TROUGH.
.24 HOUR FORECAST TROUGH LITTLE CHANGE.
.48 HOUR FORECAST TROUGH LITTLE CHANGE.

.RIDGE 30N140W 24N149W 23N155W MOVING S SLOWLY.

.RIDGE 30N175E 27N169E NEARLY STATIONARY AND ERODING FROM W.

.NE TO E WINDS 20 TO 25 KT FROM 05N TO 25N W OF 175W.
.24 HOUR FORECAST NE TO E WINDS 20 TO 25 KT W OF LINE 22N175W
22N180W 06N166E.
.48 HOUR FORECAST NE TO E WINDS 20 TO 25 KT BETWEEN 23N AND LINE
23N161W 08N180W 06N160E.

.SEAS 12 TO 19 FT IN AREA 30N178E 25N176E 19N179E 25N166W 30N155W.
SEAS 8 TO 12 FT ELSEWHERE N OF LINE 30N145W 22N152W 25N159W
19N170W 15N175E 04N160E.
.24 HOUR FORECAST SEAS 12 TO 15 FT IN AREA 30N165W 26N175W 23N175E
24N170W 24N160W 30N154W. SEAS 8 TO 12 FT ELSEWHERE N OF LINE
30N144W 20N154W 12N172W 08N160E.
.48 HOUR FORECAST SEAS 12 TO 14 FT N OF LINE 30N150W 25N155W
30N165W. SEAS 8 TO 12 FT ELSEWHERE N OF LINE 30N145W 18N152W
17N165W 07N179E 10N160E.

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

.ITCZ 10N140W 10N148W. ISOLATED MODERATE TSTMS WITHIN 90 NM OF
ITCZ.

$$

.FORECASTER POWELL. HONOLULU HI.



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