648
FZPN40 PHFO 171524
HSFNP

HIGH SEAS FORECAST
NATIONAL WEATHER SERVICE HONOLULU HI
1700 UTC MON AUG 17 2026

SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 180W

SYNOPSIS VALID 1200 UTC AUG 17 2026.
24 HOUR FORECAST VALID 1200 UTC AUG 18 2026.
48 HOUR FORECAST VALID 1200 UTC AUG 19 2026.

.WARNINGS.

...HURRICANE WARNING...
.TROPICAL STORM LALA NEAR 20.4N 163.4W 997 MB AT 1500 UTC AUG 17
MOVING W OR 265 DEG AT 10 KT. MAXIMUM SUSTAINED WINDS 50 KT
GUSTS 60 KT. TROPICAL STORM FORCE WINDS WITHIN 50 NM S
SEMICIRCLE...70 NM NE QUADRANT AND 90 NM NW QUADRANT.  SEAS 4 M
OR GREATER WITHIN 180 NM NE QUADRANT...75 NM SE QUADRANT...120
NM SW QUADRANT...AND 150 NM NW QUADRANT WITH SEAS TO 7 M. WINDS 20
TO 30 KT AND SEAS 2.5 TO 4 M ELSEWHERE FROM 19N TO 26N BETWEEN 156W
AND 166W.
.24 HOUR FORECAST TROPICAL STORM LALA NEAR 20.4N 166.7W. MAXIMUM
SUSTAINED WINDS 55 KT GUSTS 65 KT. TROPICAL STORM FORCE WINDS
WITHIN 90 NM N SEMICIRCLE...70 NM SE QUADRANT AND 50 NM SW
QUADRANT. SEAS 4 M OR GREATER FROM 19N TO 23N BETWEEN 163W AND 1
67W WITH SEAS TO 5.5 M. WINDS 20 TO 30 KT AND SEAS 2.5 TO 4 M
ELSEWHERE FROM 18N TO 28N BETWEEN 160W AND 171W.
.48 HOUR FORECAST HURRICANE LALA NEAR 21.2N 169.7W. MAXIMUM
SUSTAINED WINDS 75 KT GUSTS 90 KT. TROPICAL STORM FORCE WINDS
WITHIN 100 NM N SEMICIRCLE...90 NM SE QUADRANT AND 50 NM SW
QUADRANT. SEAS 4 M OR GREATER FROM 19N TO 25N BETWEEN 166W AND
171W WITH SEAS TO 8 M. WINDS 20 TO 30 KT AND  SEAS 2.5 TO 4 M
FROM 18N TO 27N BETWEEN 164W AND 174W.
FORECAST WINDS IN AND NEAR ACTIVE TROPICAL CYCLONES SHOULD BE
USED WITH CAUTION DUE TO UNCERTAINTY IN FORECAST TRACK...SIZE
AND INTENSITY.

SEE THE LATEST BULLETIN ISSUED BY NHC UNDER WMO HEADER WTPA22
PHFO.

.SYNOPSIS AND FORECAST

.LOW 17N142W 1009 MB MOVING W 10 KT. TROUGH FROM 17N140W TO LOW TO
05N140W. WINDS 20 TO 25 KT WITHIN 120 NM N SEMICIRCLE OF LOW. ISOLATED
MODERATE TSTMS WITHIN 60 NM OF LOW.
.24 HOUR FORECAST LOW 18N145W 1010 MB. TROUGH FROM 20N144W TO LOW
TO 15N146W 13N146W. WINDS 20 TO 25 KT WITHIN 120 NM N SEMICIRCLE OF LOW.
.48 HOUR FORECAST LOW WEAKENED TO TROUGH 24N145W 21N147W 18N148W
14N150W. WINDS 20 TO 25 KT WITHINT 90 NM N SEMICIRCLE OF LOW.

.24 HOUR FORECAST FRONT 30N178W 29N179W 28N180W.
.48 HOUR FORECAST FRONT WEAKENED TO TROUGH 30N179W 29N179W 27N180W.

.24 HOUR FORECAST NEW FRONT 30N178W 29N179W 28N180E.
.48 HOUR FORECAST FRONT WEAKENED TO TROUGH 30N179W 29N179W 27N180E

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

.SEAS 2.5 M OR LESS OVER THE REMAINDER OF FORECAST AREA.

.MONSOON TROUGH  12N160W 09N167W 08N176W SCATTERED MODERATE
TSTMS WITHIN 120 NM OF TROUGH.

.ITCZ 04N140W 04N142W 03N146W 02N155W 01N162W ISOLATED MODERATE TSTMS
WITHIN 150 NM OF ITCZ.


$$

.FORECASTER M BALLARD. HONOLULU HI.