High Seas Forecast
Issued by NWS

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000
FZPS40 PHFO 200004
HSFSP

HIGH SEAS FORECAST
NATIONAL WEATHER SERVICE HONOLULU HI
2330 UTC THU JAN 19 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 JAN 19 2017.
24 HOUR FORECAST VALID 1800 UTC JAN 20 2017.
48 HOUR FORECAST VALID 1800 UTC JAN 21 2017.

.WARNINGS.

...GALE WARNING...
.LOW NEAR 21S152W 1002 MB MOVING SE 15 KT. TROUGHS FROM LOW TO
25S149W AND FROM LOW TO 19S159W TO 20S167W. WINDS NW TO NE 20 TO
35 KT 480 NM NE OF TROUGH AXIS BETWEEN 159W AND 143W. ALSO WINDS E
TO SE 20 TO 35 KT WITHIN 240 NM SW OF TROUGH AXIS BETWEEN 155W AND 149W.
SEAS 10 TO 15 FT FROM 18S TO 25S BETWEEN 151W AND 143W. SEAS 8 TO 10 FT
ELSEWHERE WITHIN A POLYGON BOUND BY 13S153W 25S141W 25S154W 13S153W.
LINE OF CONVERGENCE FROM 11S170W TO 12S158W TO 19S148W TO 25S173W.
SCATTERED MODERATE TO STRONG TSTMS WITHIN 240 NM EITHER SIDE OF
LINE E OF 153W. ISOLATED MODERATE TO STRONG TSMTS WITHIN 180 NM EITHER
SIDE OF LINE W OF 153W.
.24 HOUR FORECAST LOW NEAR 25S149W 1000 MB. TROUGH FROM LOW TO 21S152W
TO 19S159W. WINDS NW TO NE 20 TO 35 KT WITHIN 480 NM NE OF TROUGH AXIS
BETWEEN 152W AND 140W. WINDS SE TO S 20 TO 30 KT OVER FORECAST WATERS
S OF TROUGH AXIS BETWEEN 155W AND 149W. SEAS 10 TO 15 FT FROM 20S TO
25S BETWEEN 147W AND 141W. SEAS 8 TO 10 FT ELSEWHERE WITHIN A POLYGON
BOUND BY 18S147W 25S140W 25S153W 18S147W.
.48 HOUR FORECAST LOW S OF FORECAST AREA. TROUGH FROM 25S145W TO 21S149W
TO 16S156W. WINDS NW TO N 20 TO 30 KT WITHIN 480 NM E OF TROUGH. SEAS
8 TO 10 FT WITHIN A POLYGON BOUND BY 18S145W 25S136W 25S146W 18S145W.

.SYNOPSIS AND FORECAST.

.LOW NEAR 19S179E 1005 MB MOVING W SLOWLY. TROUGH FROM LOW TO 19S174W
TO 17S169W AND FROM LOW TO 14S174E TO 12S167E TO 13S160E. WINDS W TO NW
20 TO 25 KT WITHIN 240 NM NE OF ASSOCIATED LINE OF CONVERGENCE E OF 171E.
LINE OF CONVERGENCE FROM 09S160E TO 09S171E TO 11S179E TO 13S174W.
NUMEROUS MODERATE TO STRONG TSTMS WITHIN 480 NM N OF LINE OF CONVERGENCE
W OF 179E. ISOLATED MODERATE TO STRONG TSTMS ELSEWHERE WITHIN 240 NM OF
LINE AND 240 NM OF OF TROUGH AXIS=. ALSO SCATTERED MODERATE TSTMS
WITHIN 300 NM OF LOW CENTER SW SEMICIRCLE.
.24 HOUR FORECAST LOW NEAR 19S177E 1006 MB. TROUGH FROM LOW TO 18S176W TO
16S171W AND FROM LOW TO 15S172E. ASSOCIATED WINDS DIMINISHED TO 20 KT
OR LESS.
.48 HOUR FORECAST DISSIPATING LOW NEAR 18S174E 1007 MB. TROUGHS FROM LOW
TO 18S176W AND FROM LOW TO 15S172E TO 09S163E. DEVELOPING LOW ALONG TROUGH
NEAR 09S163E 1006 MB.

.TROUGH FROM 17S120W TO 14S125W NEARLY MOVING SW SLOWLY. SCATTERED MODERATE
TO STRONG TSTMS WITHIN 120 NM EITHER SIDE OF TROUGH AXIS.
.24 HOUR FORECAST TROUGH FROM 16S131W TO 22S120W.
.48 HOUR FORECAST TROUGH DISSIPATED.

.RIDGE FROM 19S135W TO 11S147W TO 06S160W TO 05S172W.
.24 HOUR FORECAST RIDGE FROM 12S135W TO 08S147W TO 06S164W.
.48 HOUR FORECAST RIDGE FROM 14S122W TO 10S135W TO 08S147W TO 06S164W.

.WINDS 20 KT OR LESS REMAINDER FORECAST AREA.

.SEAS 8 FT OR LOWER REMAINDER FORECAST AREA.

$$

.FORECASTER BEDAL. HONOLULU HI.


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