High Seas Forecast
Issued by NWS

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000
FZPS40 PHFO 180319
HSFSP

HIGH SEAS FORECAST
NATIONAL WEATHER SERVICE HONOLULU HI
0530 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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

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

SYNOPSIS VALID 0000 UTC DEC 18 2017.
24 HOUR FORECAST VALID 0000 UTC DEC 19 2017.
48 HOUR FORECAST VALID 0000 UTC DEC 20 2017.

.WARNINGS.

.NONE.

.SYNOPSIS AND FORECAST.

.LOW 15S175W 1001 MB MOVING ESE 10 KT. TROUGH FROM 25S148W TO
18S160W TO LOW TO 12S1750E TO 13S160E. TROUGH MOVING S E OF LOW
AND NEARLY STATIONARY W OF LOW. SCATTERED MODERATE TO STRONG TSTMS
WITHIN 360 NM N OF LOW AND TROUGH W OF 167W. ISOLATED MODERATE
TSTMS WITHIN 240 NM OF TROUGH ELSEWHERE.
.24 HOUR FORECAST LOW 17S170W 1002 MB. TROUGH FROM 25S129W TO
20S160W TO LOW TO 12S180E TO 13S160E. NW WINDS 20 TO 30 KT AND
SEAS 8 TO 10 FT WITHIN 220 NM OF LOW E AND NE QUADS.
.48 HOUR FORECAST LOW 21S166W 1004 MB. TROUGH FROM 25S150W TO LOW
TO 17S170W TO 11S180W TO 12S160E. WINDS 20 TO 25 KT AND SEAS 8 TO
9 FT WITHIN 180 NM OF E OF LOW.

.TROUGH 24S120W TO 22S130W TO 22S138W NEARLY STATIONARY.
.24 HOUR FORECAST TROUGH NO SIGNIFICANT CHANGE.
.48 HOUR FORECAST TROUGH 24S120W TO 22S130W TO 20S140W TO
10S145W.

.WEAK TROUGH 10S141W TO 18S138W MOVING W SLOWLY.
.24 HOUR FORECAST TROUGH DISSIPATED.

.RIDGE FROM 21S120W TO 18S135W NEARLY STATIONARY.

.RIDGE FROM 12S147W TO 07S160W TO 01S175E NEARLY STATIONARY.

.SEAS 8 TO 9 FT S OF 20S BETWEEN 160W AND 180W.
.24 HOUR FORECAST SEAS ELSEWHERE DIMINISHED TO 8 FT OR LESS.

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

.ISOLATED MODERATE TSTMS WITHIN 180 NM OF A LINE FROM 14S153W TO
10S160W.

$$

.FORECASTER MORRISON. HONOLULU HI.


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