High Seas Forecast
Issued by NWS

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000
FZPN03 KNHC 210236
HSFEP2

HIGH SEAS FORECAST
NWS NATIONAL HURRICANE CENTER MIAMI FL
0430 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 0000 UTC FRI JUL 21.
24 HOUR FORECAST VALID 0000 UTC SAT JUL 22.
48 HOUR FORECAST VALID 0000 UTC SUN JUL 23.

.WARNINGS.

...HURRICANE WARNING...
.TROPICAL STORM GREG NEAR 14.3N 117.4W 1003 MB AT 0300 UTC JUL
21 MOVING W OR 275 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 120 NM NE...75 NM SE...
45 NM SW AND 90 NM NW QUADRANTS WITH SEAS TO 18 FT. ELSEWHERE
WITHIN 90 NM OF CENTER WINDS 20 TO 33 KT. SEAS 8 TO 12 FT.
REMAINDER OF AREA FROM 11N TO 18N BETWEEN 111W AND 120W WINDS 20
KT OR LESS. SEAS TO 10 FT PRIMARILY IN MIXED SWELL.
.24 HOUR FORECAST TROPICAL STORM GREG NEAR 15.1N 120.9W. MAXIMUM
SUSTAINED WINDS 60 KT GUSTS 75 KT. TROPICAL STORM FORCE WINDS
WITHIN 70 NM N AND 30 NM S SEMICIRCLES. SEAS 12 FT OR GREATER
WITHIN 150 NM NW AND 90 NM SE SEMICIRCLES WITH SEAS TO 21 FT.
ELSEWHERE WITHIN 180 NM NW AND 120 NM SE SEMICIRCLES OF CENTER
WINDS 20 TO 33 KT. SEAS 8 TO 12 FT. REMAINDER OF AREA FROM 10N
TO 19N BETWEEN 116W AND 125W WINDS 20 KT OR LESS. SEAS TO 10 FT
PRIMARILY IN MIXED SWELL.
.48 HOUR FORECAST HURRICANE GREG NEAR 15.7N 125.3W. MAXIMUM
SUSTAINED WINDS 70 KT GUSTS 85 KT. TROPICAL STORM FORCE WINDS
WITHIN 80 NM N SEMICIRCLE...60 NM SE AND 50 NM SW QUADRANTS.
SEAS 12 FT OR GREATER WITHIN 150 NM OF CENTER WITH SEAS TO 24
FT. ELSEWHERE WITHIN 180 NM OF CENTER WINDS 20 TO 33 KT. SEAS 8
TO 12 FT. REMAINDER OF AREA BOUNDED BY 24N130W TO 19N120W TO
13N118W TO 08N127W TO 24N130W WINDS 20 KT OR LESS. SEAS TO 11 FT
PRIMARILY IN MIXED SWELL.
.72 HOUR FORECAST HURRICANE GREG NEAR 15.8N 129.9W. 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 16.1N 133.4W. MAXIMUM
SUSTAINED WINDS 55 KT GUSTS 65 KT.
.120 HOUR FORECAST TROPICAL STORM GREG NEAR 17.0N 136.0W.
MAXIMUM SUSTAINED WINDS 50 KT GUSTS 60 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 17N TO 23N W OF 137W
WINDS 20 TO 33 KT. SEAS 11 TO 17 FT. ELSEWHERE W OF LINE FROM
26N140W TO 19N135W TO 13N140W WINDS 20 KT OR LESS. SEAS TO 11 FT
PRIMARILY IN MIXED SWELL.
.24 HOUR FORECAST W OF LINE FROM 25N140W TO 20N138W TO 18N140W
WINDS 20 KT OR LESS. SEAS TO 9 FT PRIMARILY IN MIXED SWELL.
.36 HOUR FORECAST CONDITIONS W OF AREA.

.TROPICAL DEPRESSION EIGHT-E REMNANT LOW PRES 13N126W 1009 MB.
WINDS 20 TO 25 KT WITHIN 120 NM OF CENTER. SEAS TO 11 FT WITHIN
150 NM OF CENTER.
.24 HOUR FORECAST LOW PRES 11N126W 1010 MB. WINDS 20 TO 25 KT
WITHIN 120 NM SE QUADRANT OF LOW. SEAS TO 11 FT IN MIXED SWELL
WITHIN 150 NM OF CENTER.
.36 HOUR FORECAST LOW DISSIPATED. CONDITIONS MERGE.

.LOW PRES 08N90W 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
10N94W 1008 MB. WITHIN 420 NM SE SEMICIRCLE WINDS 20 KT OR LESS.
SEAS TO 8 FT WITH SW SWELL.
.48 HOUR FORECAST LOW PRES...POSSIBLE TROPICAL CYCLONE...NEAR
12N101W 1007 MB. WITHIN 90 NM OF LINE FROM 08N93W TO 07N99W
WINDS 20 KT OR LESS. SEAS TO 8 FT WITH SW SWELL.

.LOW PRES NEAR 12N107W 1008 MB. NE TO E WINDS 20 TO 30 KT WITHIN
240 NM NE QUADRANT OF LOW. SEAS TO 10 FT. ELSEWHERE FROM 07N TO
17N BETWEEN 97W AND 111W WINDS 20 KT OR LESS. SEAS TO 9 FT
PRIMARILY IN SW SWELL.
.24 HOUR FORECAST LOW PRES...POSSIBLE TROPICAL CYCLONE...NEAR
14N111W 1007 MB. WITHIN 180 NM E SEMICIRCLE OF LOW SE TO S WINDS
20 TO 30 KT. SEAS 9 TO 11 FT. ELSEWHERE WITHIN 360 NM E AND 120
NM W SEMICIRCLES OF LOW WINDS 20 KT OR LESS. SEAS TO 9 FT
PRIMARILY IN SW SWELL.
.48 HOUR FORECAST LOW PRES...POSSIBLE TROPICAL CYCLONE...NEAR
15N113.5W 1006 MB. WITHIN 120 NM E AND 90 NM W SEMICIRCLES OF
LOW WINDS 20 TO 30 KT. SEAS 8 TO 11 FT. ELSEWHERE WITHIN 240 NM
E AND 150 NM W SEMICIRCLES OF LOW WINDS 20 KT OR LESS. SEAS TO 9
FT PRIMARILY IN SW SWELL.

.WITHIN 45 NM EITHER SIDE OF LINE FROM 16N95W TO 13.5N95W...
INCLUDING THE GULF OF TEHUANTEPEC...WINDS 20 KT OR LESS.
SEAS TO 9 FT IN MIXED NE AND SW SWELL.
.24 HOUR FORECAST WINDS 20 KT OR LESS. SEAS LESS THAN 8 FT.

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

CONVECTION VALID AT 0215 UTC FRI JUL 21...

.LOW PRES 08N89W 1009 MB...SCATTERED MODERATE ISOLATED STRONG
WITHIN 210 NM SE QUADRANT AND W SEMICIRCLE OF CENTER.

.LOW PRES 12N107W 1008 MB...SCATTERED STRONG WITHIN 120 NM OF
12.5N109W.

.TROPICAL STORM GREG...SCATTERED MODERATE TO STRONG WITHIN 150 NM
OF THE CENTER.

.REMNANT LOW PRES TROPICAL DEPRESSION EIGHT...SCATTERED MODERATE
ISOLATED STRONG WITHIN 60 NM OF 13N126W.

.TROPICAL STORM FERNANDA...SCATTERED MODERATE WITHIN 60 NM OF
20N139W.

.INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...
MONSOON TROUGH FROM 09N78W TO 11N86W TO LOW PRES 08N89W TO LOW
PRES 12N107W. ELSEWHERE...SCATTERED MODERATE ISOLATED STRONG
WITHIN 90 NM OF 08N96W AND 14N122W.

$$
.FORECASTER NELSON. NATIONAL HURRICANE CENTER.



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