National Weather Service United States Department of Commerce

439
FZPN40 PHFO 181525
HSFNP

HIGH SEAS FORECAST
NATIONAL WEATHER SERVICE HONOLULU HI
1700 UTC FRI JUN 18 2021

SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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

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

SYNOPSIS VALID 1200 UTC JUN 18 2021.
24 HOUR FORECAST VALID 1200 UTC JUN 19 2021.
48 HOUR FORECAST VALID 1200 UTC JUN 20 2021.

.WARNINGS.

.NONE.

.SYNOPSIS AND FORECAST.

.TROUGH FROM 28N159W TO 26N161W TO 24N164W MOVING WNW 10 KT.
ISOLATED TO LOCALLY SCATTERED MODERATE TSTMS FROM 25N TO 27N BETWEEN
158W AND 161W.
.24 HOUR FORECAST TROUGH FROM 30N165W TO 24N166W.
.48 HOUR FORECAST TROUGH DISSIPATED.

.TROUGH FROM 08N140W TO 06N144W TO 05N150W MOVING WNW SLOWLY.
ISOLATED MODERATE TSTMS WITHIN 90 NM OF TROUGH.
.24 HOUR FORECAST TROUGH FROM 11N140W TO 10N144W TO 06N149W.
.48 HOUR FORECAST TROUGH FROM 12N147W TO 08N150W TO 06N154W.

.12 HOUR FORECAST NEW FRONT FROM 30N178W TO 29N179E.
.24 HOUR FORECAST FRONT FROM 30N174W TO 28N177W TO 27N179E.
.48 HOUR FORECAST FRONT WEAKENED TO TROUGH FROM 30N174W TO 24N179E.

.HIGH 28N173E 1019 MB NEARLY STATIONARY. RIDGE FROM HIGH TO
23N160E...AND FROM HIGH TO 27N177W TO 28N170W TO 30N163W.
.24 HOUR FORECAST HIGH 30N174E 1019 MB.
.48 HOUR FORECAST HIGH 28N171E 1020 MB.

.NE TO E WINDS 20 TO 25 KT FROM 10N TO 14N BETWEEN 152W AND 169W.
.24 HOUR FORECAST WINDS EASED TO 20 KT OR LESS.

.WINDS 20 KT OR LESS REST OF FORECAST AREA.

.SEAS 8 FT OR LESS ENTIRE FORECAST AREA.

.ITCZ FROM 05N152W TO 07N167W TO 05N180E TO 03N167E. ISOLATED
MODERATE TSTMS WITHIN 210 NM N...AND 120 NM S...OF ITCZ...AND S OF
01N BETWEEN 167E AND 173E.

$$

.FORECASTER KINEL. HONOLULU HI.