High Seas Forecast
Issued by NWS

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FZPS40 PHFO 172324
HSFSP

HIGH SEAS FORECAST
NATIONAL WEATHER SERVICE HONOLULU HI
2330 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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

SOUTH PACIFIC EQUATOR TO 25S BETWEEN 120W AND 160E

SYNOPSIS VALID 1800 UTC OCT 17 2017.
24 HOUR FORECAST VALID 1800 UTC OCT 18 2017.
48 HOUR FORECAST VALID 1800 UTC OCT 19 2017.

.WARNINGS.

...GALE WARNING...
.TROUGH FROM 10S176W TO 18S171W TO 25S170W. TROUGH MOVING SE 15 KT
S OF 21S AND NEARLY STATIONARY ELSEWHERE. WINDS 20 TO 25 KT S OF
20S BETWEEN 163W AND 166W. SCATTERED STRONG TSTMS FROM 16S TO 23S
BETWEEN 159W AND 168W.
.24 HOUR FORECAST NEW LOW NEAR 24S158W 1002 MB. FRONT FROM LOW TO
18S165W TO 14S173W THENCE TROUGH TO 10S180W TO 07S167E TO 05S160E.
WINDS 30 TO 35 KT S OF 23S BETWEEN 155W AND 159W. NE TO E WINDS
20 TO 30 KT ELSEWHERE S OF 20S BETWEEN LOW AND 150W.
.48 HOUR FORECAST LOW MOVED WELL S OF AREA. FRONT FROM 25S161W TO
16S170W THENCE TROUGH TO 12S180W TO 07S160E. ASSOCIATED WINDS
DIMINISHED TO 20 KT OR LESS.

.SYNOPSIS AND FORECAST.

.TROUGH FROM 02S172E TO 05S173E TO 09S179E MOVING W 10 KT.
ISOLATED MODERATE TSTMS FROM 03S TO 08S BETWEEN 173E AND 177E.
.24 HOUR FORECAST TROUGH MERGED WITH TROUGH DESCRIBED ABOVE.

.COLD FRONT FROM 21S120W TO 18S127W THENCE STATIONARY FRONT TO
15S140W TO 17S150W TO 18S157W. E TO SE WINDS 20 TO 25 KT S OF
17S BETWEEN 138W AND 154W.
.24 HOUR FORECAST FRONT FROM 18S120W TO 14S140W TO 20S150W.
E TO SE WINDS 20 TO 25 KT S OF FRONT BETWEEN 130W AND 150W.
.48 HOUR FORECAST DISSIPATING FRONT FROM 16S120W TO 12S136W TO
13S147W. E TO SE WINDS 20 TO 25 KT FROM 13S TO 22S BETWEEN
131W AND 146W.

.E TO SE WINDS 20 TO 25 KT S OF 19S W OF 180W.
.24 HOUR FORECAST SE WINDS 20 TO 25 KT SW OF A LINE FROM
12S160E TO 15S170E TO 20S177E TO 25S177E.
.48 HOUR FORECAST ASSOCIATED WINDS DIMINISHED TO 20 KT OR LESS.

.SEAS 9 TO 13 FT S OF A LINE FROM 20S120S TO 25S135W. SEAS 8 TO
9 FT ELSEWHERE S OF A LINE FROM 17S120W TO 18S150W TO 20S156W TO
25S154W. SEAS 8 TO 10 FT S OF 19S W OF 180E.
.24 HOUR FORECAST SEAS 11 TO 16 FT S OF 22S BETWEEN 150W AND 161W.
SEAS 8 TO 11 FT ELSEWHERE S OF A LINE FROM 13S120W TO 15S137W TO
18S150W TO 20S160W TO 25S170W. SEAS 8 TO 10 FT SW OF A LINE FROM
13S160E TO 16S170E TO 25S179W.
.48 HOUR FORECAST SEAS 10 TO 13 FT S OF A LINE FROM 18S120W TO
20S128W TO 25S133W. SEAS 8 TO 10 FT ELSEWHERE S OF A LINE FROM
12S120W TO 14S140W TO 20S160W TO 21S180W TO 25S171E.

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

.ISOLATED MODERATE TSTMS FROM 1OS TO 15S BETWEEN 169E AND 161E.

$$

.FORECASTER BIRCHARD. HONOLULU HI.



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