High Seas Forecast
Issued by NWS

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338
FZPS40 PHFO 191533
HSFSP

HIGH SEAS FORECAST
NATIONAL WEATHER SERVICE HONOLULU HI
1730 UTC THU APR 19 2018

SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 APR 19 2018.
24 HOUR FORECAST VALID 1200 UTC APR 20 2018.
48 HOUR FORECAST VALID 1200 UTC APR 21 2018.

.WARNINGS.

.NONE.

.SYNOPSIS AND FORECAST.

.LOW 13S177E 1007 MB MOVING SSW SLOWLY. ANOTHER LOW 08S161E 1008 MB
MOVING N SLOWLY. TROUGH FROM 08S160E TO SECOND LOW TO 09S166E TO
09S172E TO FIRST LOW TO 15S178W TO 18S176W MOVING SW SLOWLY E
OF 171E AND MOVING N SLOWLY ELSEWHERE. WINDS 20 TO 25 KT WITHIN 120
NM SW QUADRANT OF FIRST LOW...AND S OF 18S W OF 163W. ISOLATED
MODERATE TO STRONG TSTMS WITHIN 180 NM OF TROUGH AND LOWS...AND
ELSEWHERE FROM 09S TO 20S BETWEEN 161W AND 180W.
.24 HOUR FORECAST LOW 16S177E 1008 MB. SECOND LOW 06S161E 1008 MB.
TROUGH FROM 05S160E TO SECOND LOW TO 10S172E TO FIRST LOW TO
20S177E. WINDS 20 TO 30 KT S OF 19S BETWEEN 163W AND 178E.
.48 HOUR FORECAST LOWS DISSIPATED. TROUGH FROM 07S160E TO 13S172E TO
22S177E. WINDS EASED TO 20 KT OR LESS.

.TROUGH FROM 25S149W TO 16S151W MOVING E 10 KT. ANOTHER TROUGH FROM
25S141W TO 23S141W TO 19S142W MOVING W SLOWLY. ISOLATED MODERATE
TSTMS FROM 14S TO 20S BETWEEN 142W AND 151W...AND S OF 20S BETWEEN
135W AND 148W.
.24 HOUR FORECAST MERGED TROUGH FROM 25S144W TO 15S150W.
.48 HOUR FORECAST TROUGH FROM 25S139W TO 22S140W TO 17S151W.

.RIDGE FROM 15S168W TO 11S169W TO 08S175W TO 04S168E TO 01S163E
NEARLY STATIONARY.

.SEAS 8 TO 11 FT S OF 18S BETWEEN 169W AND 178E...S OF 13S BETWEEN
178E AND 173E...S OF LINE FROM 13S173E TO 22S168E TO 20S164E AND S
OF 16S W OF 164E.
.24 HOUR FORECAST SEAS 8 TO 11 FT FROM 18S TO 21S BETWEEN 165W AND
170W...S OF 18S BETWEEN 170W AND 177E...AND S OF LINE FROM 15S176E
TO 15S173E TO 22S167E TO 20S163E.
.48 HOUR FORECAST SEAS 8 TO 10 FT FROM 19S TO 24S BETWEEN 166W AND
174W. SEAS 8 TO 9 FT S OF 20S BETWEEN 170E AND 180E.

.WINDS 20 KT OR LESS AND SEAS 8 FT OR LESS REST OF FORECAST AREA.

.ISOLATED MODERATE TSTMS N OF 03S W OF 169E...S OF 20S E OF
134W...AND WITHIN 60 NM OF 02S171E...04S173E AND 16S130W.

$$

.HONOLULU FORECAST OFFICE.



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