000
FZPN03 KNHC 210918
HSFEP2

HIGH SEAS FORECAST
NWS NATIONAL HURRICANE CENTER MIAMI FL
1030 UTC FRI JUL 21 2017

SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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.

PAN PAN

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

SYNOPSIS VALID 0600 UTC FRI JUL 21.
24 HOUR FORECAST VALID 0600 UTC SAT JUL 22.
48 HOUR FORECAST VALID 0600 UTC SUN JUL 23.

.WARNINGS.

...HURRICANE WARNING...
.TROPICAL STORM GREG NEAR 14.5N 118.3W 1003 MB AT 0900 UTC JUL 
21 MOVING W OR 280 DEG AT 9 KT. MAXIMUM SUSTAINED WINDS 45 KT 
GUSTS 55 KT. TROPICAL STORM FORCE WINDS WITHIN 50 NM N 
SEMICIRCLE. SEAS 12 FT OR GREATER WITHIN 90 NM N SEMICIRCLE...60 
NM SE AND 45 NM SW QUADRANTS WITH SEAS TO 16 FT. ELSEWHERE 
WITHIN 120 NM N AND 90 NM S SEMICIRCLES WINDS 20 TO 33 KT. SEAS 
8 TO 11 FT. REMAINDER OF AREA FROM 11N TO 18N BETWEEN 112W AND 
121W WINDS 20 KT OR LESS. SEAS TO 9 FT IN MIXED SWELL.
.24 HOUR FORECAST TROPICAL STORM GREG NEAR 15.3N 121.8W. MAXIMUM 
SUSTAINED WINDS 55 KT GUSTS 65 KT. TROPICAL STORM FORCE WINDS 
WITHIN 70 NM N AND 30 NM S SEMICIRCLES. SEAS 12 FT OR GREATER 
WITHIN 150 NM N AND 75 NM S SEMICIRCLES WITH SEAS TO 20 FT. 
ELSEWHERE WITHIN 180 NM N AND 90 NM S SEMICIRCLES WINDS 20 TO 33 
KT. SEAS 8 TO 12 FT. REMAINDER OF AREA FROM 12N TO 19N BETWEEN 
119W AND 126W WINDS 20 KT OR LESS. SEAS TO 10 FT IN MIXED SWELL.
.48 HOUR FORECAST HURRICANE GREG NEAR 15.7N 126.1W. MAXIMUM 
SUSTAINED WINDS 65 KT GUSTS 80 KT. TROPICAL STORM FORCE WINDS 
WITHIN 80 NM N SEMICIRCLE...60 NM SE QUADRANT AND 50 NM SW 
QUADRANT. SEAS 12 FT OR GREATER WITHIN 180 NM N AND 90 NM S 
SEMICIRCLES WITH SEAS TO 25 FT. ELSEWHERE WITHIN 240 NM N AND 
120 NM S SEMICIRCLES WINDS 20 TO 33 KT. SEAS 8 TO 12 FT. 
REMAINDER OF AREA FROM 11N TO 22N BETWEEN 124W AND 132W WINDS 20 
KT OR LESS. SEAS TO 10 FT IN MIXED SWELL.
.72 HOUR FORECAST HURRICANE GREG NEAR 16.0N 130.0W. MAXIMUM 
SUSTAINED WINDS 65 KT GUSTS 80 KT.
EXTENDED OUTLOOK...USE FOR GUIDANCE ONLY...ERRORS MAY BE LARGE.
.96 HOUR FORECAST TROPICAL STORM GREG NEAR 16.4N 133.3W. MAXIMUM 
SUSTAINED WINDS 55 KT GUSTS 65 KT.
.120 HOUR FORECAST TROPICAL STORM GREG NEAR 18.0N 136.0W.
MAXIMUM SUSTAINED WINDS 45 KT GUSTS 55 KT

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.

.TROPICAL STORM FERNANDA W OF AREA. FROM 19N TO 22N W OF 138W 
WINDS 20 TO 30 KT. SEAS 9 TO 12 FT. ELSEWHERE FROM 17N TO 25N W 
OF 136W WINDS 20 KT OR LESS. SEAS TO 10 FT IN MIXED SWELL.
.24 HOUR FORECAST CONDITIONS W OF AREA.

.LOW PRES NEAR 13N126W 1010 MB. WITHIN 75 NM OF CENTER WINDS 20 
TO 25 KT. SEAS TO 10 FT. 
.24 HOUR FORECAST LOW PRES 11N126W 1011 MB. WITHIN 60 NM SE 
QUADRANT OF LOW SE WINDS 20 TO 25 KT. SEAS TO 9 FT IN MIXED 
SWELL.  
.48 HOUR FORECAST LOW DISSIPATED. CONDITIONS MERGED WITH GREG.

.LOW PRES 08N91W 1009 MB. WITHIN 90 NM SE QUADRANT OF LOW WINDS 
20 KT OR LESS. SEAS TO 8 FT IN MIXED NE AND SW SWELL.
.24 HOUR FORECAST LOW PRES...POSSIBLE TROPICAL CYCLONE...NEAR 
09N96W 1008 MB. WITHIN 75 NM N QUADRANT NE TO E WINDS 20 TO 25 
KT. SEAS TO 9 FT. ELSEWHERE WITHIN 180 NM OF LOW WINDS 20 KT OR 
LESS. SEAS TO 8 FT IN SW SWELL. 
.48 HOUR FORECAST LOW PRES...POSSIBLE TROPICAL CYCLONE...NEAR 
11N100W 1005 MB. WITHIN 120 NM OF LOW WINDS 20 TO 30 KT. SEAS TO 
10 FT.  

.LOW PRES NEAR 12N108W 1008 MB. WITHIN 240 NM NE QUADRANT OF LOW 
NE TO E WINDS 20 TO 25 KT. SEAS TO 9 FT. ELSEWHERE FROM 09N TO 
16N BETWEEN 102W AND 109W WINDS 20 KT OR LESS. SEAS 8 FT IN SW 
SWELL.
.24 HOUR FORECAST LOW PRES...POSSIBLE TROPICAL CYCLONE...NEAR 
14N112W 1008 MB. WITHIN 120 NM OF LOW WINDS 20 TO 25 KT. SEAS TO 
9 FT.
.48 HOUR FORECAST LOW PRES...POSSIBLE TROPICAL CYCLONE...NEAR 
14N114W 1008 MB. WITHIN 90 NM OF LOW WINDS 20 TO 30 KT. SEAS 8 
TO 10 FT.

.WITHIN 30 NM OF LINE FROM 16N95W TO 13.5N95W...INCLUDING THE 
GULF OF TEHUANTEPEC...N WINDS 20 TO 25 KT. SEAS TO 8 FT.
.24 HOUR FORECAST WINDS 20 KT OR LESS. SEAS LESS THAN 8 FT.

.24 HOUR FORECAST N OF 29N BETWEEN 120W AND 125W WINDS 20 KT OR 
LESS. SEAS 8 FT IN N SWELL.
.48 HOUR FORECAST N OF 28N BETWEEN 120W AND 126W WINDS 20 KT OR 
LESS. SEAS 8 TO 9 FT IN N SWELL.

.REMAINDER OF AREA WINDS 20 KT OR LESS. SEAS LESS THAN 8 FT.

CONVECTION VALID AT 0900 UTC FRI JUL 21...

.LOW PRES NEAR 08N91W...SCATTERED MODERATE ISOLATED STRONG 
WITHIN 210 NM W SEMICIRCLE. 

.LOW PRES NEAR 12N108W...SCATTERED STRONG WITHIN 120 NM W 
SEMICIRCLE.

.TROPICAL STORM GREG...SCATTERED MODERATE TO STRONG WITHIN 150 
NM N AND 100 NM S SEMICIRCLES.

.INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...
MONSOON TROUGH FROM 08N78W TO 10N85W TO LOW NEAR 08N91W TO 
13N99W TO LOW NEAR 12N108W TO 13N112W. MINIMAL CONVECTION.

$$
.FORECASTER MUNDELL. NATIONAL HURRICANE CENTER.