274
FZPN40 PHFO 201529
HSFNP

HIGH SEAS FORECAST
NATIONAL WEATHER SERVICE HONOLULU HI
1700 UTC FRI SEP 20 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 1200 UTC SEP 20 2024.
24 HOUR FORECAST VALID 1200 UTC SEP 21 2024.
48 HOUR FORECAST VALID 1200 UTC SEP 22 2024.

.WARNINGS.

.NONE.

.SYNOPSIS AND FORECAST.

.48 HOUR FORECAST NEW LOW NEAR 10N142W 1011 MB. WINDS INCREASING
TO 20 TO 25 KT WITHIN 90 NM OF LOW NE SEMICIRCLE.

.TROUGH FROM 09N160E TO 15N167E TO 14N167E MOVING WNW SLOWLY.
WINDS E TO NE 20 TO 25 KT WITHIN 240 NM W OF TROUGH AXIS.
SCATTERED MODERATE TSTMS OVER FORECAST WATERS NW OF TROUGH AXIS.
.24 HOUR FORECAST TROUGH MERGED WITH TROUGH DESCRIBED IMMEDIATELY
BELOW.

.TROUGH FROM 09N172E TO 12N179W TO 18N173W MOVING NW 15 KT. WINDS
S TO SE 20 TO 25 KT AND SEAS 8 TO 9 FT WITHIN 180 NM SE OF TROUGH
AXIS. ISOLATED MODERATE TO STRONG TSTMS WITHIN 360 NM S AND SE OF
TROUGH AXIS...AND ALSO WITHIN 120 NM N AND NW OF TROUGH AXIS.
.24 HOUR FORECAST TROUGH FROM 12N160E TO 13N173E TO 19N177E.
WINDS S TO SE 20 TO 25 KT AND SEAS 8 TO 9 FT N OF 13N WITHIN 180
NM SE OF TROUGH AXIS.
.48 HOUR FORECAST TROUGH FROM 11N172E TO 19N177E. REMAINDER OF
TROUGH DISSIPATED. ASSOCIATED WINDS DIMINISHED TO 20 KT OR LESS.
ASSOCIATED SEAS SUBSIDED TO 8 FT OR LOWER.

.TROUGH FROM 24N176W TO 30N174W MOVING NW 20 KT. ISOLATED
MODERATE TSTMS WITHIN 90 NM EITHER SIDE OF TROUGH AXIS.
.24 HOUR FORECAST TROUGH FROM 26N177E TO 30N179E.
.48 HOUR FORECAST TROUGH DISSIPATED.

.TROUGH FROM 30N146W TO 27N140W MOVING W 15 KT.
.24 HOUR FORECAST TROUGH FROM 30N151W TO 26N148W.
.48 HOUR FORECAST TROUGH DISSIPATED.

.24 HOUR FORECAST NEW TROUGH FROM 06N162W TO 10N157W TO 12N151W.
.48 HOUR FORECAST TROUGH FROM 04N169W TO 08N165W TO 12N158W.

.WINDS 20 KT OR LESS REMAINDER FORECAST AREA.

.SEAS 8 FT OR LOWER REMAINDER FORECAST AREA.

.ITCZ FROM 10N140W TO 10N148W TO 07N154W TO 06N162W. ISOLATED
MODERATE TO STRONG TSTMS WITHIN 180 NM EITHER SIDE OF CONVERGENCE
LINE.

.OTHERWISE ISOLATED MODERATE TSTMS FROM 15N TO 11N BETWEEN 158W
AND 150W.

$$

.FORECASTER BEDAL. HONOLULU HI.