705 
FZPN03 KNHC 231527
HSFEP2

HIGH SEAS FORECAST
NWS NATIONAL HURRICANE CENTER MIAMI FL
1630 UTC SUN AUG 23 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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.

SECURITE

E PACIFIC FROM THE EQUATOR TO 30N E OF 140W AND 03.4S TO THE
EQUATOR E OF 120W

SYNOPSIS VALID 1200 UTC SUN AUG 23.
24 HOUR FORECAST VALID 1200 UTC MON AUG 24.
48 HOUR FORECAST VALID 1200 UTC TUE AUG 25.

.WARNINGS.

...HURRICANE WARNING...
.TROPICAL STORM ISELLE NEAR 15.3N 114.2W 1003 MB AT 1500 UTC AUG 23 
MOVING WNW OR 300 DEG AT 10 KT. MAXIMUM SUSTAINED WINDS 40 KT GUSTS 
50 KT. TROPICAL STORM FORCE WINDS WITHIN 80 NM E SEMICIRCLE...90 NM 
SW QUADRANT AND 0 NM NW QUADRANT.  SEAS 4 M OR GREATER WITHIN 60 NM 
E SEMICIRCLE AND 0 NM W SEMICIRCLE WITH SEAS TO 4.5 M. WITHIN 180 NM 
E SEMICIRCLE...120 NM SW QUADRANT AND 60 NM NW QUADRANT OF CENTER 
WINDS 20 TO 33 KT. SEAS 3.0 TO 4.0 M. ELSEWHERE FROM 08N TO 13N 
BETWEEN 112W AND 116W S TO SW WINDS 20 TO 25 KT. SEAS 2.5 TO 3.0 M. 
.24 HOUR FORECAST TROPICAL STORM ISELLE NEAR 17.9N 117.2W.
MAXIMUM SUSTAINED WINDS 55 KT GUSTS 65 KT. TROPICAL STORM FORCE 
WINDS WITHIN 120 NM NE QUADRANT...130 NM SE QUADRANT...90 NM SW 
QUADRANT...AND 70 NM NW QUADRANT. SEAS 4 M OR GREATER WITHIN 180 NM 
E SEMICIRCLE...120 NM SW QUADRANT AND 90 NM NW QUADRANT WITH SEAS TO 
6.0 M. ELSEWHERE WITHIN 210 NM E SEMICIRCLE AND 150 NM W SEMICIRCLE 
OF CENTER WINDS 20 TO 33 KT. SEAS 3.0 TO 4.0 M. REMAINDER OF THE 
AREA FROM 11N TO 15N BETWEEN 111W AND 117W S TO SW WINDS 20 TO 25 
KT. SEAS 2.5 TO 3.0 M. 
.36 HOUR FORECAST HURRICANE ISELLE NEAR 19.3N 118.7W. MAXIMUM 
SUSTAINED WINDS 65 KT GUSTS 80 KT.
.48 HOUR FORECAST HURRICANE ISELLE NEAR 20.5N 120.3W. MAXIMUM 
SUSTAINED WINDS 65 KT GUSTS 80 KT. TROPICAL STORM FORCE WINDS WITHIN 
130 NM NE QUADRANT...120 NM SE QUADRANT...70 NM SW QUADRANT...AND 
100 NM NW QUADRANT. SEAS 4 M OR GREATER WITHIN 210 NM E 
SEMICIRCLE...AND 120 NM W SEMICIRCLE OF CENTER WITH SEAS TO 7.0 M. 
ELSEWHERE WITHIN 240 NM E SEMICIRCLE AND 180 NM W SEMICIRCLE OF 
CENTER WINDS 20 TO 33 KT. SEAS 3.0 TO 4.0 M. REMAINDER OF THE AREA 
FROM 15N TO 16N BETWEEN 112W AND 124W WINDS 20 KT OR LESS. SEAS 2.5 
TO 3.0 M IN MIXED SWELL. 

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.

.N OF 14N BETWEEN 94.5W AND 95.5W...INCLUDING THE GULF OF 
TEHUANTEPEC...N WINDS 20 TO 25 KT. SEAS 2.5 M.
.24 HOUR FORECAST LITTLE CHANGE.
.48 HOUR FORECAST LITTLE CHANGE.

.FROM 10N TO 11.5N E OF 90W...INCLUDING THE GULF OF PAPAGAYO...NE TO 
E WINDS 20 TO 25 KT. SEAS TO 2.5 M.
.24 HOUR FORECAST LITTLE CHANGE.
.48 HOUR FORECAST LITTLE CHANGE.

.06 HOUR FORECAST GULF OF CALIFORNIA N OF 29N S WINDS 20 TO 25 KT. 
SEAS LESS THAN 2.5 M. 
.12 HOUR FORECAST CONDITIONS IMPROVE. WINDS 20 KT OR LESS. SEAS LESS 
THAN 2.5 M.

.REMAINDER OF AREA WINDS 20 KT OR LESS. SEAS LESS THAN 2.5 M.

CONVECTION VALID AT 1500 UTC SUN AUG 23...

.T.S. ISELLE...NUMEROUS MODERATE TO STRONG WITHIN 180 NM W 
SEMICIRCLE AND 90 NM E SEMICIRCLE. 

.INVEST EP91...SCATTERED MODERATE TO STRONG WITHIN 90 NM N 
SEMICIRCLE. SCATTERED MODERATE ISOLATED STRONG ELSEWHERE FROM
07N TO 15N BETWEEN 120W AND 130W.

.TROPICAL WAVE ALONG 86W/87W...CLUSTER OF MODERATE TO ISOLATED 
STRONG FROM 10N TO 12N BETWEEN 80W AND 85W.

.TROPICAL WAVE NEAR 100W...SCATTERED MODERATE TO ISOLATED STRONG 
FROM 10N TO 16N BETWEEN 96W AND 105W.

.INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...
THE MONSOON TROUGH EXTENDS FROM 09N84W TO 07N100W TO 15N110W TO 
10N123W TO BEYOND 06N140W. ASIDE FROM THE CONVECTION RELATED TO THE 
TROPICAL WAVES, INVEST AREA EP91 AND T.S. ISELLE DESCRIBED ABOVE, 
SCATTERED MODERATE TO ISOLATED STRONG CONVECTION CAN BE FOUND FROM 
06N TO 13N BETWEEN 90W AND 97W...AND FROM 03N TO 10N W OF 130W.

$$
.FORECASTER GR. NATIONAL HURRICANE CENTER.