382
FZPN40 PHFO 291534
HSFNP

HIGH SEAS FORECAST
NATIONAL WEATHER SERVICE HONOLULU HI
1700 UTC TUE JUL 29 2025

SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 JUL 29 2025.
24 HOUR FORECAST VALID 1200 UTC JUL 30 2025.
48 HOUR FORECAST VALID 1200 UTC JUL 31 2025.

.WARNINGS.

...HURRICANE WARNING...
.HURRICANE IONA NEAR 10.8N 154.3W 957 MB AT 1500 UTC JUL 29
MOVING W OR 270 DEG AT 11 KT. MAXIMUM SUSTAINED WINDS 110 KT GUSTS
135 KT. TROPICAL STORM FORCE WINDS WITHIN 60 NM NW AND SE
QUADRANTS...70 NM NE QUADRANT AND 50 NM SW QUADRANT. WINDS 20 TO
33 KT ELSEWHERE FROM 16N TO 09N BETWEEN 157W AND 150W. SEAS 4 M OR
GREATER WITHIN 150 NM OF CENTER WITH SEAS TO 5 M. SEAS 2.5 TO 4 M
ELSEWHERE FROM 15N TO 10N BETWEEN 156W AND 151W. SCATTERED STRONG
TSTMS FROM 12N TO 09N BETWEEN 154W AND 151W.
.24 HOUR FORECAST HURRICANE IONA NEAR 10.9N 159.1W. MAXIMUM
SUSTAINED WINDS 105 KT GUSTS 130 KT. TROPICAL STORM FORCE WINDS
WITHIN 60 NM NW AND SE QUADRANTS...70 NM NE QUADRANT AND 40 NM SW
QUADRANT. WINDS 20 TO 33 KT ELSEWHERE FROM 18N TO 09N BETWEEN 165W
AND 156W. SEAS 4 M OR GREATER WITHIN 180 NM OF CENTER WITH SEAS
TO 7 M. SEAS 2.5 TO 4 M ELSEWHERE FROM 18N TO 08N BETWEEN 163W AND
156W.
.48 HOUR FORECAST HURRICANE IONA NEAR 11.6N 166.1W. MAXIMUM
SUSTAINED WINDS 85 KT GUSTS 105 KT. LITTLE CHANGE IN RADIUS OF
TROPICAL STORM FORCE WINDS AND SEAS 4 M OR GREATER. WINDS 20 TO 33
KT ELSEWHERE FROM 18N TO 10N BETWEEN 168W AND 162W. SEAS 2.5 TO 4
M ELSEWHERE FROM 19N TO 08N BETWEEN 171W AND 163W.

FORECAST WINDS IN AND NEAR ACTIVE TROPICAL CYCLONES SHOULD BE
USED WITH CAUTION DUE TO UNCERTAINTY IN FORECAST TRACK...SIZE AND
INTENSITY.

...TROPICAL STORM WARNING...
.TROPICAL STORM KELI NEAR 12.5N 148.0W 1006 MB AT 1500 UTC JUL 29
MOVING W OR 280 DEG AT 11 KT. MAXIMUM SUSTAINED WINDS 35 KT GUSTS
45 KT. TROPICAL STORM FORCE WINDS WITHIN 30 NM N SEMICIRCLE AND 0
NM S SEMICIRCLE. WINDS 20 TO 33 KT ELSEWHERE FROM 16N TO 11N
BETWEEN 148W AND 144W. SEAS 2.5 TO 4 M FROM 17N TO 11N BETWEEN
149W AND 145W. SCATTERED MODERATE TSTMS FROM 13N TO 11N BETWEEN
149W AND 147W.
.24 HOUR FORECAST TROPICAL STORM KELI NEAR 13.2N 153.3W. MAXIMUM
SUSTAINED WINDS 35 KT GUSTS 45 KT. LITTLE CHANGE IN RADIUS OF
TROPICAL STORM FORCE WINDS. WINDS 20 TO 33 KT ELSEWHERE FROM 18N
TO 13N BETWEEN 155W AND 150W. SEAS 4 M OR GREATER WITHIN 60 NM OF
CENTER. SEAS 2.5 TO 4 M ELSEWHERE FROM 18N TO 12N BETWEEN 155W AND
149W.
.48 HOUR FORECAST TROPICAL DEPRESSION KELI NEAR 13.4N 159.5W.
MAXIMUM SUSTAINED WINDS 30 KT GUSTS 40 KT. SEAS 2.5 TO 4 M FROM
20N TO 10N BETWEEN 164W AND 157W.

FORECAST WINDS IN AND NEAR ACTIVE TROPICAL CYCLONES SHOULD BE
USED WITH CAUTION DUE TO UNCERTAINTY IN FORECAST TRACK...SIZE AND
INTENSITY.

.SYNOPSIS AND FORECAST.

.TROUGH 30N150W 25N154W NEARLY STATIONARY. ISOLATED MODERATE
TSTMS N OF 28N BETWEEN 149W AND 147W.
.24 HOUR FORECAST TROUGH 30N151W 26N154W.
.48 HOUR FORECAST TROUGH DISSIPATED.

.TROUGH 30N177W 26N179E 23N177E MOVING NW SLOWLY. ISOLATED
MODERATE TSTMS N OF 22N BETWEEN 175E AND 173W.
.24 HOUR FORECAST TROUGH 30N178W 26N176E.
.48 HOUR FORECAST TROUGH DISSIPATED.

.TROUGH 13N168E 09N166E 05N167E MOVING W SLOWLY. SCATTERED
MODERATE TO STRONG TSTMS FROM 14N TO 08N BETWEEN 164E AND 173E.
ISOLATED MODERATE TSTMS FROM 07N TO 02N W OF 166E.
.24 HOUR FORECAST TROUGH 11N162E 05N165E.
.48 HOUR FORECAST TROUGH 14N160E 06N163E.

.24 HOUR FORECAST NEW LOW NEAR 10N140W 1011 MB. WINDS 20 TO 25 KT
FROM 18N TO 11N E OF 145W. SEAS 2.5 TO 3 M FROM 18N TO 10N E OF
147W.
.48 HOUR FORECAST LOW NEAR 12N147W 1008 MB. WINDS 20 TO 25 KT
FROM 18N TO 11N E OF 153W. SEAS 2.5 TO 4 M FROM 21N TO 06N E OF
150W.

.WINDS 20 KT OR LESS AND SEAS 2.5 M OR LOWER OVER REMAINDER OF
FORECAST AREA.

.MONSOON TROUGH FROM 08N140W TO 07N143W TO T.S. KELI TO HURCN
IONA TO 08N156W THENCE ITCZ 06N170W 05N175W 06N172E. ISOLATED
MODERATE TSTMS WITHIN 180 NM OF ITCZ...AND WITHIN 120 NM OF
MONSOON TROUGH E OF 143W.

.ISOLATED MODERATE TSTMS N OF 24N BETWEEN 166E AND 174E.

$$

.FORECASTER TROTTER. HONOLULU HI.