High Seas Forecast
Issued by NWS

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475
FZPS40 PHFO 201541
HSFSP

HIGH SEAS FORECAST
NATIONAL WEATHER SERVICE HONOLULU HI
1730 UTC TUE AUG 20 2019

SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 AUG 20 2019.
24 HOUR FORECAST VALID 1200 UTC AUG 21 2019.
48 HOUR FORECAST VALID 1200 UTC AUG 22 2019.

.WARNINGS.

.NONE.

.SYNOPSIS AND FORECAST.

.LOW NEAR 09S168E 1007 MB NEARLY STATIONARY. TROUGHS FROM LOW TO
12S174E TO 15S179W AND FROM LOW TO 06S160E. SCATTERED MODERATE TO
STRONG TSTMS WITHIN 150 NM EITHER SIDE OF TROUGH AXIS. ISOLATED
MODERATE TSTMS ELSEWHERE FROM 00S TO 13S BETWEEN 160E AND 178E.
.24 HOUR FORECAST LOW DISSIPATED. TROUGH FROM 06S160E TO 09S168E TO
12S177E.
.48 HOUR FORECAST TROUGH FROM 06S160E TO 11S167E TO 17S176E TO
19S176W.

.COLD FRONT FROM 25S127W TO 23S132W MOVING NE 15 KT.
.24 HOUR FORECAST FRONT FROM 22S120W TO 21S128W.
.48 HOUR FORECAST FRONT DISSIPATED.

.COLD FRONT FROM 25S155W TO 21S161W MOVING E 20 KT THENCE A STATIONARY
FRONT TO 16S173W. NE TO NW 20 TO 30 KT S OF 23S WITHIN 420 NM E OF
FRONT.
.24 HOUR FORECAST FRONT FROM 25S150W TO 21S160W TO 19S171W. FRONT
DISSIPATING W OF 160W. ASSOCIATED WINDS DIMINISHED TO 20 KT OR LESS.
.48 HOUR FORECAST FRONT FROM 25S141W TO 22S148W TO 21S160W. FRONT
DISSIPATING W OF 158W.

.COLD FRONT FROM 25S171E TO 23S166E TO 23S162E MOVING E 30 KT.
ISOLATED MODERATE TSTMS WITHIN 720 NM E AND NE OF FRONTAL BOUNDARY.
.24 HOUR FORECAST FRONT FROM 25S173W TO 23S178W.
.48 HOUR FORECAST FRONT FROM 25S172W TO 19S176W.

.COLD FRONT FROM 25S158W TO 21S164W TO 17S175W MOVING E 30 KT S OF
21S AND SE 10 KT N OF 21S. WIND NE TO NW 20 TO 25 KT S OF 23S WITHIN
420 NM E OF FRONT. ISOLATED MODERATE TSTMS WITHIN 720 NM E AND NE
OF FRONTAL BOUNDARY.
.24 HOUR FORECAST FRONT FROM 25S152W TO 21S158W TO 18S168W. ASSOCIATED
WINDS DIMINISHED TO 20 KT OR LESS.
.48 HOUR FORECAST FRONT FROM 25S143W TO 22S151W TO 21S158W.

.TROUGH FROM 06S176W TO 11S168W MOVING SW 10 KT.  SCATTERED
MODERATE TSTMS WITHIN 180 NM EITHER SIDE OF TROUGH AXIS.
.24 HOUR FORECAST TROUGH MERGED WITH TROUGH DESCRIBED ABOVE ALONG
06S160E TO 09S168E TO 12S177E.

.HIGH NEAR 23S176E 1011 MB.
.24 HOUR FORECAST HIGH NEAR 23S165E 1014 MB.
.48 HOUR FORECAST HIGH S OF FORECAST AREA.

.RIDGE FROM 21S145W TO 10S161W.
.24 HOUR FORECAST RIDGE FROM 25S135W TO 16S153W.
.48 HOUR FORECAST DEVELOPING HIGH NEAR 21S132W 1020 MB. RIDGE FROM
HIGH TO 19S145W.

.OTHERWISE WINDS SE TO S 20 TO 25 KT FROM 08S TO 18S BETWEEN 160E AND
170E.
.24 HOUR FORECAST WINDS E TO SE 20 TO 25 KT FROM 06S TO 16S BETWEEN
160E AND 165E.
.48 HOUR FORECAST WINDS DIMINISHED TO 20 KT OR LESS.

.WINDS 20 KT OR LESS REMAINDER FORECAST AREA.

.SEAS 8 TO 10 FT FROM 03S TO 25S BETWEEN 128W AND 120W...AND ALSO
FROM 24S TO 25S BETWEEN 160E AND 167E.
.24 HOUR FORECAST SEAS 8 TO 10 FT FROM 23S TO 25S BETWEEN 160E AND
178E.
.48 HOUR FORECAST SEAS 8 TO 12 FT FROM 23S TO 25S BETWEEN 160E AND
178E.

.SEAS 8 FT OR LOWER REMAINDER FORECAST AREA.


$$

.FORECASTER BEDAL. HONOLULU HI.



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