632  
FZPN03 KNHC 211600  
HSFEP2  
 
HIGH SEAS FORECAST  
NWS NATIONAL HURRICANE CENTER MIAMI FL  
1630 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS  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 1200 UTC FRI JUL 21.  
24 HOUR FORECAST VALID 1200 UTC SAT JUL 22.  
48 HOUR FORECAST VALID 1200 UTC SUN JUL 23.  
 
.WARNINGS.  
   
..HURRICANE WARNING
 
 
.TROPICAL STORM GREG NEAR 15.1N 119.2W 1001 MB AT 1500 UTC JUL  
21 MOVING WNW OR 285 DEG AT 9 KT. MAXIMUM SUSTAINED WINDS 50 KT  
GUSTS 60 KT. TROPICAL STORM FORCE WINDS WITHIN 60 NM N  
SEMICIRCLE AND 20 NM S SEMICIRCLE. SEAS 12 FT OR GREATER WITHIN  
150 NM N AND 90 NM S SEMICIRCLES WITH SEAS TO 16 FT. ELSEWHERE  
WITHIN 210 NM NW AND 150 NM SE SEMICIRCLES WINDS 20 TO 33 KT.  
SEAS 8 TO 12 FT. REMAINDER OF AREA FROM 10N TO 18N BETWEEN 115W  
AND 123W WINDS 20 KT OR LESS. SEAS TO 9 FT IN MIXED SWELL.  
.24 HOUR FORECAST TROPICAL STORM GREG NEAR 15.7N 122.8W. MAXIMUM  
SUSTAINED WINDS 60 KT GUSTS 75 KT. TROPICAL STORM FORCE WINDS  
WITHIN 70 NM N SEMICIRCLE AND 30 NM S SEMICIRCLE. SEAS 12 FT OR  
GREATER WITHIN 150 NM N AND 90 NM S SEMICIRCLES WITH SEAS TO 20  
FT. ELSEWHERE WITHIN 210 NM NW AND 180 NM SE SEMICIRCLES WINDS  
20 TO 33 KT. SEAS 8 TO 12 FT. REMAINDER OF AREA FROM 13N TO 19N  
BETWEEN 120W AND 131W WINDS 20 KT OR LESS. SEAS TO 10 FT IN  
MIXED SWELL.  
.48 HOUR FORECAST HURRICANE GREG NEAR 16.0N 127.4W. 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 360 NM NW AND  
270 NM SE SEMICIRCLES WINDS 20 TO 33 KT. SEAS 8 TO 12 FT.  
REMAINDER OF AREA NW SEMICIRCLE WITHIN 520 NM AND SE SEMICIRCLE  
WITHIN 410 NM WINDS 20 KT OR LESS. SEAS TO 10 FT IN MIXED SWELL.  
.72 HOUR FORECAST TROPICAL STORM GREG NEAR 16.2N 130.8W. MAXIMUM  
SUSTAINED WINDS 60 KT GUSTS 75 KT.  
EXTENDED OUTLOOK...USE FOR GUIDANCE ONLY...ERRORS MAY BE LARGE.  
.96 HOUR FORECAST TROPICAL STORM GREG NEAR 17.1N 133.9W. MAXIMUM  
SUSTAINED WINDS 50 KT GUSTS 60 KT.  
.120 HOUR FORECAST TROPICAL STORM GREG NEAR 18.5N 136.5W.  
MAXIMUM SUSTAINED WINDS 40 KT GUSTS 50 KT.  
 
.TROPICAL DEPRESSION NINE-E NEAR 9.0N 93.5W 1008 MB AT 1500 UTC  
JUL 21 MOVING W OR 280 DEG AT 12 KT. MAXIMUM SUSTAINED WINDS 30  
KT GUSTS 40 KT. FROM 08N TO 11N BETWEEN 86W AND 94W WINDS 20 TO  
20 KT. SEAS 8 TO 10 FT. FROM 03N TO 07N BETWEEN 87W AND 97W  
WINDS 20 KT OR LESS. SEAS 8 TO 9 FT PRIMARILY IN S SWELL.  
.24 HOUR FORECAST TROPICAL STORM NINE-E NEAR 10.0N 98.0W.  
MAXIMUM SUSTAINED WINDS 40 KT GUSTS 50 KT. TROPICAL STORM FORCE  
WINDS WITHIN 0 NM S SEMICIRCLE...40 NM NE QUADRANT AND 30 NM NW  
QUADRANT. SEAS 12 FT OR GREATER NE SEMICIRCLE WITHIN 90 NM WITH  
SEAS TO 15 FT. ELSEWHERE WITHIN 270 NM E AND 90 NM W SEMICIRCLES  
WINDS 20 TO 33 KT. SEAS 8 TO 12 FT. REMAINDER OF AREA FROM 04N  
TO 13N BETWEEN 89W AND 100W WINDS 20 KT OR LESS. SEAS 8 TO 10 FT  
IN MIXED SWELL.  
.48 HOUR FORECAST TROPICAL STORM NINE-E NEAR 12.2N 101.5W.  
MAXIMUM SUSTAINED WINDS 55 KT GUSTS 65 KT. TROPICAL STORM FORCE  
WINDS WITHIN 75 NM NE QUADRANT...50 NM SE QUADRANT...40 NM SW  
QUADRANT...AND 60 NM NW QUADRANT. SEAS 12 FT OR GREATER WITHIN  
120 NM NW AND 90 NM SE SEMICIRCLES WITH SEAS TO 20 FT. ELSEWHERE  
WITHIN 410 NM SE AND 120 NM NW SEMICIRCLES WINDS 20 TO 33 KT.  
SEAS 8 TO 12 FT. REMAINDER OF AREA FROM 05N TO 15N BETWEEN 94W  
AND 104W WINDS 20 KT OR LESS. SEAS 8 TO 10 FT IN MIXED SWELL.  
.72 HOUR FORECAST HURRICANE NINE-E NEAR 14.5N 104.7W. MAXIMUM  
SUSTAINED WINDS 65 KT GUSTS 80 KT.  
EXTENDED OUTLOOK...USE FOR GUIDANCE ONLY...ERRORS MAY BE LARGE.  
.96 HOUR FORECAST HURRICANE NINE-E NEAR 16.0N 108.0W. MAXIMUM  
SUSTAINED WINDS 80 KT GUSTS 100 KT.  
.120 HOUR FORECAST HURRICANE NINE-E NEAR 17.0N 112.0W. MAXIMUM  
SUSTAINED WINDS 90 KT GUSTS 110 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 18N TO 24N W OF 139W  
WINDS 20 KT OR LESS. SEAS 8 TO 9 FT IN MIXED SWELL.  
.12 HOUR FORECAST CONDITIONS W OF AREA.  
 
.LOW PRES NEAR 13N126W 1010 MB. WITHIN 90 NM OF CENTER WINDS 20  
TO 25 KT. SEAS TO 10 FT. ELSEWHERE FROM 10N TO 16N BETWEEN 123W  
AND 127W WINDS 20 KT OR LESS. SEAS 8 TO 9 FT IN MIXED SWELL.  
.24 HOUR FORECAST LOW PRES 12N126W 1011 MB. WITHIN 1800 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 NEAR 13N109W 1008 MB. WITHIN 300 NM E SEMICIRCLE OF  
LOW WINDS 20 KT OR LESS. SEAS 8 TO 9 FT PRIMARILY IN S 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 60 NM OF LINE FROM 16N95W TO 12.5N95W
 
INCLUDING THE  
GULF OF TEHUANTEPEC...N WINDS 20 TO 25 KT. SEAS TO 11 FT.  
.12 HOUR FORECAST WITHIN 30 NM OF LINE FROM 16N95W TO  
12.5N95.5W...INCLUDING THE GULF OF TEHUANTEPEC...WINDS 20 KT OR  
LESS. SEAS 8 TO 9 FT IN MIXED SWELL.  
.24 HOUR FORECAST WINDS 20 KT OR LESS. SEAS LESS THAN 8 FT.  
 
.12 HOUR FORECAST N OF 29N BETWEEN 120W AND 125W WINDS 20 KT OR  
LESS. SEAS 8 FT IN N SWELL.  
.24 HOUR FORECAST N OF 27.5N BETWEEN 120W AND 125W WINDS 20 KT  
OR LESS. SEAS 8 TO 9 FT IN N SWELL.  
.48 HOUR FORECAST N OF 29N BETWEEN 121W AND 125W WINDS 20 KT OR  
LESS. SEAS 8 FT IN N SWELL.  
 
.REMAINDER OF AREA WINDS 20 KT OR LESS. SEAS LESS THAN 8 FT.  
 
CONVECTION VALID AT 1500 UTC FRI JUL 21...  
   
TROPICAL DEPRESSION 09E
 
SCATTERED MODERATE TO STRONG SE  
SEMICIRCLE WITHIN 120 TO 150 NM AND W QUADRANT WITHIN 180 NM.  
 
.LOW PRES NEAR 13N109W IN ASSOCIATION WITH TROPICAL WAVE ALONG  
109W/11OW...SCATTERED STRONG WITHIN 180 NM SW QUADRANT OF LOW.  
   
TROPICAL STORM GREG
 
SCATTERED MODERATE TO STRONG NW  
SEMICIRCLE WITHIN 90 NM AND SE SEMICIRCLE WITHIN 45 NM.  
   
INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH
 
 
MONSOON TROUGH FROM 08N78W TO 09N85W TO T.D. 09E NEAR 08N95W TO  
12N100W TO LOW PRES 1008 MB NEAR 13N109W TO 14N112W...THEN  
RESUMES FROM 13N120W TO REMNANT LOW OF T.D. 08E NEAR 12N127W TO  
12N130W. EXCEPT AS NOTED ABOVE...MINIMAL CONVECTION.  
 

 
.FORECASTER MCELROY. NATIONAL HURRICANE CENTER.  
 
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