National Weather Service United States Department of Commerce

000
FZPN40 PHFO 210321
HSFNP

HIGH SEAS FORECAST
NATIONAL WEATHER SERVICE HONOLULU HI
0500 UTC MON OCT 21 2019

SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 0000 UTC OCT 21 2019.
24 HOUR FORECAST VALID 0000 UTC OCT 22 2019.
48 HOUR FORECAST VALID 0000 UTC OCT 23 2019.

.WARNINGS.

.NONE.

.SYNOPSIS AND FORECAST.

.WEAKENING FRONT FROM 30N163W TO 25N167W MOVING E 10 KT. ISOLATED
MODERATE TSTMS WITHIN 90 NM OF FRONT.
.24 HOUR FORECAST FRONT DISSIPATED.

.TROUGH FROM 22N179W TO 17N180W NEARLY STATIONARY. ISOLATED
MODERATE TSTMS WITHIN 90 NM OF TROUGH.
.24 HOUR FORECAST TROUGH FROM 23N176E TO 17N178E.
.48 HOUR FORECAST TROUGH DISSIPATED.

.TROUGH WEAKENING FROM 21N161W TO 12N162W MOVING W 10 KT.
ISOLATED MODERATE TSTMS WITHIN 150 NM E OF TROUGH.
.24 HOUR FORECAST TROUGH MERGED WITH TROUGH DESCRIBED ABOVE.

.TROUGH WEAKENING FROM 22N169W TO 17N172W MOVING W 10 KT.
SCATTERED MODERATE TSTMS WITHIN 240 NM OF TROUGH.
.24 HOUR FORECAST TROUGH MERGED WITH TROUGH DESCRIBED ABOVE.

.E TO NE WINDS 20 TO 25 KT FROM 15N TO 23N E OF 149W.
E TO NE WINDS 20 TO 25 KT FROM 15N TO 12 BETWEEN 154W AND 157W.
.24 HOUR FORECAST E WINDS 20 TO 25 KT FROM 10N TO 25N E OF 153W.
E WINDS 20 TO 25 KT FROM 18N TO 12 BETWEEN 158W AND 164W.
.48 HOUR FORECAST E TO NE WINDS 20 TO 25 KT FROM 22N TO 11N E
OF 160W. E TO NE WINDS 20 TO 25 KT FROM 16N TO 21N W OF 169E.

.24 HOUR FORECAST NEW LOW 08N141W 1007 MB.
.48 HOUR FORECAST LOW 09N145W 1008 MB.

.24 HOUR FORECAST NEW COLD FRONT JUST N OF AREA.
.48 HOUR FORECAST FRONT FROM 30N168W TO 24N175W TO 22N180W.

.24 HOUR FORECAST NEW TROUGH FROM 30N174W TO 27N180W.
.48 HOUR FORECAST TROUGH MERGED WITH NEW FRONT DESCRIBED ABOVE.

.RIDGE FROM 30N145W TO 25N161W MOVING NW SLOWLY.

.RIDGE NEARLY 30N173W TO 29N160W NEARLY STATIONARY.

.OTHERWISE...WINDS 20 KT OR LESS OVER REMAINDER OF FORECAST AREA.

.SEAS 8 TO 9 FT FROM 24N TO 15N E OF 146W.
.24 HOUR FORECAST SEAS 8 TO 9 FT FROM 11N TO 19N E OF 150W.
.48 HOUR FORECAST SEAS 8 TO 9 FT N OF 27N BETWEEN 175W AND 170E.

.OTHERWISE...SEAS 8 FT OR LOWER OVER REMAINDER OF FORECAST AREA.

.ISOLATED MODERATE TSTMS FROM 12N TO 17N BETWEEN 165W AND 168W...
FROM 16N TO 19N BETWEEN 169E AND 164E.

.MONSOON TROUGH FROM 07N140W TO 09N152W TO 07N162W. SCATTERED
MODERATE TSTMS WITHIN 180 NM OF MONSOON TROUGH BETWEEN 146W AND
160W.

.ITCZ FROM 07N162W TO 06N171W. ISOLATED MODERATE TSTMS WITHIN
120 NM OF ITCZ.

$$

.FORECASTER 42. HONOLULU HI.