The High Seas Forecast for the Central North Pacific

High Seas Forecast Issued: 08/13/2026 08:35:05 PM UTC
                        
811
FZPN40 PHFO 131035
HSFNP

HIGH SEAS FORECAST
NATIONAL WEATHER SERVICE HONOLULU HI
1100 UTC THU AUG 13 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 0600 UTC AUG 13 2026.
24 HOUR FORECAST VALID 0600 UTC AUG 14 2026.
48 HOUR FORECAST VALID 0600 UTC AUG 15 2026.

.WARNINGS.

...TROPICAL STORM WARNING...
.POTENTIAL TROPICAL CYCLONE ONE-C NEAR 14.8N 144.5W 1002 MB AT
0900 UTC AUG 13 MOVING W OR 275 DEG AT 9 KT. MAXIMUM SUSTAINED
WINDS 35 KT GUSTS 45 KT. TROPICAL STORM FORCE WINDS WITHIN 0 NM
OF CENTER EXCEPT 240 NM NE QUADRANT. WINDS 20 TO 33 KT ELSEWHERE
BOUNDED BY AREA 21N140W 10N140W 21N150W 21N140W. SEAS 4 M OR
GREATER WITHIN 180 NM NW AND SE QUADRANTS...240 NM NE QUADRANT
AND 90 NM SW QUADRANT WITH SEAS TO 4.5 M. SCATTERED MODERATE TO
STRONG TSTMS WITHIN 210 NM E AND S QUADRANTS OF CENTER. ISOLATED
MODERATE TSTMS WITHIN 270 NM OF CENTER.
.24 HOUR FORECAST TROPICAL STORM ONE-C TROPICAL CYCLONE NEAR
16.5N 147.9W. MAXIMUM SUSTAINED WINDS 40 KT GUSTS 50 KT.
TROPICAL STORM FORCE WINDS WITHIN 150 NM NE QUADRANT...60 NM SE
QUADRANT...0 NM SW QUADRANT...AND 90 NM NW QUADRANT. WINDS
ELSEWHERE 20 TO 33 KT FROM 22N TO 15N BETWEEN 144W AND 152W.
SEAS 4 M OR GREATER WITHIN 240 NM NW AND SE QUADRANTS...270
NM NE QUADRANT AND 90 NM SW QUADRANT WITH SEAS TO 5.5 M.
.48 HOUR FORECAST TROPICAL STORM ONE-C NEAR 18.0N 153.0W.
MAXIMUM SUSTAINED WINDS 50 KT GUSTS 60 KT. TROPICAL STORM FORCE
WINDS WITHIN 120 NM NE QUADRANT...70 NM SE QUADRANT...40 NM SW
QUADRANT...AND 100 NM NW QUADRANT. WINDS 20 TO 33 KT ELSEWHERE
FROM 22N TO 16N BETWEEN 149W AND 155W. SEAS 4 M OR GREATER WITHIN
300 NM NW AND NE QUADRANTS...90 NM SE QUADRANT AND 210 NM SW
QUADRANT WITH SEAS TO 6 M.

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

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

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

.MONSOON TROUGH 11N140W 06N153W 07N177W 08N180W. SCATTERED
MODERATE TSTMS WITHIN 210 NM OF TROUGH...AND 180 NM N OF TROUGH.

.ISOLATED MODERATE TSTMS FROM 12N TO 07N BETWEEN 154W AND 165W.


$$

.FORECASTER THOMAS. HONOLULU HI.