High Seas Forecast
Issued by NWS

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891
FZPN40 PHFO 190336
HSFNP

HIGH SEAS FORECAST
NATIONAL WEATHER SERVICE HONOLULU HI
0500 UTC THU SEP 19 2024

SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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.

THE NATIONAL WEATHER SERVICE IS ACCEPTING PUBLIC COMMENTS UNTIL
OCTOBER 16 2024 ON A PROPOSAL TO REPLACE FEET WITH METERS WHEN
DESCRIBING SEAS IN A VARIETY OF NATIONAL MARINE CENTER TEXT AND
GRAPHICAL PRODUCTS FOR THE OFFSHORE AND HIGH SEAS AREAS ONLY.
TO LEARN MORE PLEASE VISIT
HTTPS://OCEAN.WEATHER.GOV/PROPOSED-METERS.PHP


SECURITE

NORTH PACIFIC EQUATOR TO 30N BETWEEN 140W AND 160E

SYNOPSIS VALID 0000 UTC SEP 19 2024.
24 HOUR FORECAST VALID 0000 UTC SEP 20 2024.
48 HOUR FORECAST VALID 0000 UTC SEP 21 2024.

.WARNINGS.

.NONE.

.SYNOPSIS AND FORECAST.

.TROUGH 23N172W 17N174W MOVING W AT 10 KT. ISOLATED MODERATE
TSTMS WITHIN 240 NM E OF TROUGH.
.24 HOUR FORECAST TROUGH DISSIPATED.

.TROUGH 16N170E 11N171E MOVING W AT 10 KT. WINDS 20 TO 25 KT
WITHIN 240 NM E OF TROUGH.
.24 HOUR FORECAST TROUGH 11N166E 05N161E. WINDS EASED TO 20 KT
OR LESS.
.48 HOUR FORECAST TROUGH MOVED W OF AREA.

.24 HOUR FORECAST NEW TROUGH 30N174W 25N175W.
.48 HOUR FORECAST TROUGH 30N176W 26N175W.

.24 HOUR FORECAST NEW TROUGH 13N176W 10N177E. SEAS 8 TO 9 FT
FROM 16N TO 05N BETWEEN 178W AND 169W.
.48 HOUR FORECAST TROUGH STRENGTHENED TO LOW 13N179E. WINDS 20
TO 25 KT WITHIN 120 NM OF LOW N SEMICIRCLE. SEAS 8 TO 12 FT
WITHIN 150 NM OF LOW.

.WINDS 20 KT OR LESS REMAINDER FORECAST AREA.

.SEAS 8 TO 9 FT FROM 16N TO 05N BETWEEN 172W AND 160W.
.24 HOUR FORECAST SEAS SUBSIDED TO 8 FT OR LESS.

.SEAS 8 FT OR LOWER REMAINDER FORECAST AREA.

.ITCZ 10N140W 09N147W 12N159W 07N175W 07N175E. SCATTERED
MODERATE TSTMS WITHIN 180 NM OF ITCZ.

.ISOLATED MODERATE TSTMS N OF 24N BETWEEN 171W AND 158W.

$$

.FORECASTER TROTTER. HONOLULU HI.