High Seas Forecast
Issued by NWS

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520
FZPS40 PHFO 181019
HSFSP

HIGH SEAS FORECAST
NATIONAL WEATHER SERVICE HONOLULU HI
1130 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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

SOUTH PACIFIC EQUATOR TO 25S BETWEEN 120W 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...
.LOW NEAR 22S168W 1007 MB MOVING SSE 35 KT. DEVELOPING COLD
FRONT FROM 25S170W TO 22S175W TO 19S180W MOVING NE AND N TO 10 KT.
ALSO...TROUGH FROM 25S167W TO LOW TO 13S175W TO 12S180W NEARLY
STATIONARY. N AND NE WINDS INCREASING TO 20 TO 35 KT S OF 20S
BETWEEN 155W AND 165W. SCATTERED MODERATE TSTMS S OF 14S BETWEEN
152W AND 163W.
.24 HOUR FORECAST FRONT 25S165W TO 21S170W TO 18S180W. ALSO...
TROUGH FROM 15S170W TO 12S174W TO 12S180W. NE TO N WINDS 20 TO
30 KT S OF 23S BETWEEN 145W AND 156W.
.48 HOUR FORECAST FRONT 25S161W TO 20S167W TO 16S180W. ALSO TROUGH
FROM 18S167W TO 14S175W TO 15S180W. WINDS DIMINISHED TO 20 KT OR
LESS.

.SYNOPSIS AND FORECAST.

.TROUGH 12S180W TO 09S170E TO 07S165E MOVING SW SLOWLY.
SCATTERED TSTMS WITHIN 100 NM S OF TROUGH.
.24 HOUR FORECAST TROUGH 06S160E TO 12S180W.
.48 HOUR FORECAST TROUGH 08S160E TO 10S170E TO 14S180W.

.FRONT 19S120W TO 16S130W TO 14S138W MOVING NE SLOWLY.
.24 HOUR FORECAST FRONT 16S120W TO 15S125W TO 14S135W.
.48 HOUR FORECAST FRONT 15S120W TO 14S125W TO 13S165W.

.E TO NE WINDS 20 TO 25 KT S OF 15S BETWEEN 155W AND 135W.
.24 HOUR FORECAST E TO SE WINDS 20 TO 25 KT S OF 14S BETWEEN
130W AND 145W.
.48 HOUR FORECAST E WINDS 20 TO 25 KT BETWEEN 12S AND 24S FROM
130W TO 150W.

.SEAS 8 TO 12 FT S OF 12S E OF 144W. SEAS 8 TO 10 FT S OF A LINE
17S132W TO 18S160W TO 25S170W. SEAS 8 TO 10 FT S OF 18S W OF 180W.
.24 HOUR FORECAST SEAS 8 TO 14 FT S OF A LINE FROM 17S140W TO
22S167W. SEAS 8 TO 12 FT S OF 14S E OF 140W. SEAS 8 TO 10 FT
S OF 14S W OF 166E. SEAS 8 TO 9 FT S OF 14S ELSEWHERE W OF 180W.
.48 HOUR FORECAST SEAS 8 TO 12 FT S OF 12S E OF 143W. SEAS 8 TO
10 FT S OF 23S BETWEEN 165W AND 175E. SEAS 8 TO 9 FT S OF A LINE
FROM 17S144W TO 25S165W.

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


$$

.FORECASTER LAU. HONOLULU HI.



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