High Seas Forecast
Issued by NWS

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FZPS40 PHFO 171534
HSFSP

HIGH SEAS FORECAST
NATIONAL WEATHER SERVICE HONOLULU HI
1730 UTC SUN DEC 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 1200 UTC DEC 17 2017.
24 HOUR FORECAST VALID 1200 UTC DEC 18 2017.
48 HOUR FORECAST VALID 1200 UTC DEC 19 2017.

.WARNINGS.

.NONE.

.SYNOPSIS AND FORECAST.

.LOW 15S175W 1003 MB MOVING ESE NEAR 10 KT. TROUGH FROM 25S153W TO
17S164W TO LOW TO 12S165E TO 13S160E. TROUGH MOVING N SLOWLY W OF
LOW AND TROUGH MOVING E SLOWLY E OF LOW. SCATTERED MODERATE TO
STRONG TSTMS WITHIN 250 NM N TO 400 NM NW QUADRANT OF LOW.
.24 HOUR FORECAST LOW 15S172W 1002 MB. TROUGH FROM 21S164W TO LOW
TO 12S179E TO 14S160E. WINDS 20 TO 25 KT SEAS 8 TO 10 FT WITHIN
240 NM N OF TROUGH AND LOW E OF 180W.
.48 HOUR FORECAST LOW 18S168W 1004 MB. TROUGH FROM 25S157W TO LOW
TO 12S175W TO 12S170E TO 14S160E. WINDS 20 TO 25 KT SEAS 8 TO 10
FT WITHIN 220 NM OF LOW AND WITHIN 220 NM E OF TROUGH BETWEEN 12S
AND 20S.

.TROUGH FROM 25S149W TO 20S154W TO 15S164W MOVING S TO 10 KT...
MERGING WITH TROUGH DESCRIBED ABOVE.
.24 HOUR FORECAST TROUGHS MERGED.

.WEAK DISSIPATING FRONT FROM 25S160W TO 22S170W MOVING SE TO 10 KT.
.12 HOUR FORECAST FRONT DISSIPATED.

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

.TROUGH 10S141W TO 19S137W MOVING W SLOWLY. ISOLATED TSTMS WITHIN
180 NM E OF TROUGH.
.24 HOUR FORECAST TROUGH 12S142W TO 20S137W.
.48 HOUR FORECAST TROUGH 10S145W TO 20S140W.

.RIDGE FROM 00S160E TO 04S180W TO 16S145W NEARLY STATIONARY.

.ELSEWHERE SEAS 8 TO 9 FT S OF A LINE FROM 25S180W TO 20S168W TO
20S160W.
.24 HOUR FORECAST ELSEWHERE SEAS DIMINISHED TO 8 FT OR LESS.

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

.SCATTERED MODERATE TO STRONG TSTMS WITHIN 200 NM N OF A LINE
FROM 08S180W TO 12S160E...AND WITHIN 150 NM OF A POINT AT
10S156W.

$$

.FORECASTER LAU. HONOLULU HI.



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