High Seas Forecast
Issued by NWS

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081
FZPS40 PHFO 200320
HSFSP

HIGH SEAS FORECAST
NATIONAL WEATHER SERVICE HONOLULU HI
0530 UTC SUN AUG 20 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 AUG 20 2017.
24 HOUR FORECAST VALID 0000 UTC AUG 21 2017.
48 HOUR FORECAST VALID 0000 UTC AUG 22 2017.

.WARNINGS.

.NONE.

.SYNOPSIS AND FORECAST.

.LOW NEAR 07S169E 1009 MB MOVING SE 10 KT. TROUGH FROM 08S179E TO
LOW TO 02S160E. SCATTERED MODERATE TSTMS FROM 05S TO 08S BETWEEN
173W AND 177E. ISOLATED MODERATE TSTMS ELSEWHERE WITHIN 180 NM OF
LOW AND TROUGH.
.24 HOUR FORECAST LOW NEAR 09S172E 1009 MB. TROUGH FROM 09S179E
TO LOW TO 03S160E.
.48 HOUR FORECAST LOW DISSIPATED. TROUGH FROM 09S171E TO 04S160E.

.FRONT FROM 25S175E TO 21S167E TO 20S160E MOVING E 20 KT. WINDS
20 TO 30 KT S OF FRONT...AND WITHIN 240 NM E OF FRONT S OF 22S.
.24 HOUR FORECAST FRONT FROM 25S176W TO 19S179E. WINDS DIMINISHED
TO 20 KT OR LESS.
.48 HOUR FORECAST FRONT FROM 25S168W TO 19S175W.

.TROUGH FROM 17S120W TO 07S137W MOVING WNW 10 KT.
.24 HOUR FORECAST TROUGH FROM 17S120W TO 06S144W.
.48 HOUR FORECAST TROUGH FROM 20S129W TO 09S140W TO 04S155W.

.E TO SE WINDS 20 TO 25 KT FROM 10S TO 15S BETWEEN 158W AND
168W...AND FROM 17S TO 20S BETWEEN 148W AND 152W.
.24 HOUR FORECAST E TO SE WINDS 20 TO 25 KT FROM 13S TO 20S
BETWEEN 142W AND 156W.
.48 HOUR FORECAST E TO SE WINDS 20 TO 25 KT FROM 12S TO 16S
BETWEEN 145W AND 152W.

.RIDGE FROM 25S141W TO 21S132W TO 19S124W MOVING SE 10 KT.

.SEAS 12 TO 17 FT S OF A LINE FROM 25S177E TO 22S170E TO 20S160E.
SEAS 8 TO 12 FT ELSEWHERE S OF A LINE FROM 25S178W TO 20S172E TO
18S160E. SEAS 8 TO 11 FT S OF A LINE FROM 19S120W TO 16S130W TO
18S138W...AND FROM 08S TO 18S BETWEEN 155W AND 169W.
.24 HOUR FORECAST SEAS 12 TO 14 FT S OF A LINE FROM 25S174E TO
23S178E TO 20S160E. SEAS 8 TO 12 FT ELSEWHERE S OF A LINE FROM
25S170W TO 17S175E TO 12S160E. SEAS 8 TO 9 FT FROM 08S TO 18S
BETWEEN 152W AND 170W...AND S OF 23S BETWEEN 125W AND 136W.
.48 HOUR FORECAST SEAS 8 TO 11 FT S OF A LINE FROM 20S172W TO
15S175E TO 11S160E...AND E OF A LINE FROM 18S126W TO 25S133W. SEAS
8 TO 9 FT FROM 12S TO 16S BETWEEN 157W AND 161W.

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

.ISOLATED MODERATE TSTMS FROM 10S TO 13S BETWEEN 162W AND 170W.

$$

.FORECASTER BRAVENDER. HONOLULU HI.



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