High Seas Forecast
Issued by NWS

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000
FZPN01 KWBC 211556
HSFEP1

HIGH SEAS FORECAST
NWS OCEAN PREDICTION CENTER WASHINGTON DC
1630 UTC THU SEP 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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.

SECURITE

PACIFIC N OF 30N AND S OF 67N E OF A LINE FROM BERING STRAIT
TO 50N 160E

SYNOPSIS VALID 1200 UTC SEP 21.
24 HOUR FORECAST VALID 1200 UTC SEP 22.
48 HOUR FORECAST VALID 1200 UTC SEP 23.

.WARNINGS.

...GALE WARNING...
.LOW 49N175W 990 MB MOVING E 15 KT. BETWEEN 240 NM AND 660 NM N
QUADRANT...WITHIN 420 NM S AND SW SEMICIRCLES AND WITHIN 360 NM
E OF A FRONT FROM 55N163W TO 40N161W WINDS 25 TO 35 KT. SEAS 8
TO 17 FT. ELSEWHERE N OF 61N BETWEEN 166W AND 174W WINDS TO 25
KT. SEAS TO 9 FT.
.24 HOUR FORECAST LOW 49N168W 999 MB. BETWEEN 180 NM AND 900 NM
N QUADRANT AND WITHIN 300 NM S AND SE AND 480 NM NW QUADRANTS
WINDS 20 TO 30 KT. SEAS 8 TO 15 FT.
.48 HOUR FORECAST LOW 54N157W 997 MB. WITHIN 300 NM S SEMICIRCLE
AND N OF 55N BETWEEN 162W AND 170W WINDS 20 TO 30 KT. SEAS TO 12
FT.

...GALE WARNING...
.24 HOUR FORECAST NEW LOW 39N177E 1011 MB. FRONT TO EXTEND FROM
LOW TO 34N165E. WITHIN 180 NM S OF FRONT AREA OF SW WINDS 20 TO
30 KT. SEAS TO 10 FT.
.48 HOUR FORECAST COMPLEX LOW WITH MEAN CENTER 41N170W 1001 MB.
WITHIN 360 NM SE AND 420 NM S QUADRANTS WINDS 25 TO 35 KT. SEAS
8 TO 12 FT. ELSEWHERE WITHIN 540 NM SE AND 600 NM SW QUADRANTS
WINDS 20 TO 30 KT. SEAS TO 9 FT.

.SYNOPSIS AND FORECAST.

.BOGOSLOF VOLCANO AT 53.92N 168.03W IS CURRENTLY IN A HEIGHTENED
STATE OF UNREST. MARINERS TRAVELING IN THE VICINITY OF BOGOSLOF
VOLCANO ARE URGED TO EXERCISE CAUTION. IF MARINERS ENCOUNTER ANY
VOLCANIC ASH...REPORT THE OBSERVATION TO THE OCEAN PREDICTION
CENTER BY CALLING 301-683-1520.

.FROM 37N TO 56N BETWEEN 127W AND 137W AND FROM 34N TO 39N
BETWEEN 122W AND 127W AREA OF N TO NW WINDS 20 TO 30 KT. SEAS 8
TO 14 FT.
.24 HOUR FORECAST FROM 32N TO 50N BETWEEN 118W AND 132W AREA OF
N TO NW WINDS TO 25 KT. SEAS TO 12 FT.
.48 HOUR FORECAST FROM 32N TO 43N BETWEEN 120W AND 127W AREA OF
N WINDS TO 25 KT. SEAS TO 9 FT.

.LOW 38N175E 1013 MB MOVING NE 20 KT. WITHIN 300 NM S QUADRANT
WINDS TO 25 KT. SEAS TO 9 FT.
.24 HOUR FORECAST LOW 39N174W 1012 MB. WITHIN 180 NM SE AND 300
NM S QUADRANTS WINDS 20 TO 30 KT. SEAS TO 10 FT.
.48 HOUR FORECAST LOW AND ASSOCIATED CONDITIONS DESCRIBED WITH
COMPLEX LOW IN WARNINGS SECTION ABOVE.

.24 HOUR FORECAST NEW LOW 59N156W 999 MB. WITHIN 300 NM S AND
360 NM SE QUADRANTS...AND WITHIN 180 NM E OF A FRONT TO EXTEND
FROM 56N140W TO 49N149W TO 41N158W WINDS 20 TO 30 KT. SEAS TO 11
FT.
.48 HOUR FORECAST LOW DISSIPATED WITH NEW LOW 54N135W 1011 MB.
WITHIN 240 NM SE AND E OF A FRONT TO EXTEND FROM LOW TO 47N148W
TO 39N160W AREA OF S TO SW WINDS TO 25 KT. SEAS TO 9 FT.

.24 HOUR FORECAST LOW 43N165E 1004 MB. OVER FORECAST WATERS
BETWEEN 180 NM AND 420 NM S QUADRANT AND WITHIN 240 NM N
SEMICIRCLE WINDS TO 20 TO 30 KT. SEAS TO 11 FT.
.48 HOUR FORECAST LOW DISSIPATED AND ASSOCIATED CONDITIONS
DIMINISHED.

.DENSE FOG. VSBY OCCASIONALLY LESS THAN 1 NM FROM 49N TO 56N
BETWEEN 145W AND 179W AND WITHIN 300 NM SE OF A LINE FROM
49N154W TO 46N159W TO 42N164W.
.24 HOUR FORECAST DENSE FOG WITHIN 300 NM SE OF A LINE FROM
54N145W TO 50N153W TO 44N161W.
.48 HOUR FORECAST DENSE FOG WITHIN AN AREA BOUNDED BY 42N151W TO
51N140W TO 56N148W TO 41N164W TO 42N151W.

.HIGH 44N144W 1033 MB MOVING SE 05 KT.
.24 HOUR FORECAST HIGH 42N143W 1030 MB.
.48 HOUR FORECAST HIGH 41N139W 1029 MB.

.HIGH 42N148W 1033 MB MOVING E 10 KT.
.24 HOUR FORECAST HIGH MERGED WITH HIGH 42N143W.

.HIGH 30N177W 1021 MB MOVING NE 25 KT.
.24 HOUR FORECAST HIGH 33N170W 1021 MB.
.48 HOUR FORECAST HIGH DISSIPATED.

.48 HOUR FORECAST HIGH 55N173E 1024 MB.

.FORECASTER KOSIER. OCEAN PREDICTION CENTER.

NATIONAL HURRICANE CENTER MIAMI FL

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

SYNOPSIS VALID 1200 UTC THU SEP 21.
24 HOUR FORECAST VALID 1200 UTC FRI SEP 22.
48 HOUR FORECAST VALID 1200 UTC SAT SEP 23.

.WARNINGS.

.NONE.

.SYNOPSIS AND FORECAST.

.LOW PRES NEAR 17N103W 1008MB. WITHIN 60 NM EITHER SIDE OF LINE
FROM 14N100W TO 10N112W SW WINDS 20 TO 25 KT. SEAS 8 TO 9 FT.
.24 HOUR FORECAST LOW PRES...POSSIBLE TROPICAL CYCLONE...NEAR
16N102W 1007 MB. WITHIN 90 NM EITHER SIDE OF LINE FROM 15N99W TO
13N102W TO 10N115W SW TO W WINDS 20 TO 25 KT. SEAS 8 TO 10 FT.
.48 HOUR FORECAST LOW PRES...POSSIBLE TROPICAL CYCLONE...NEAR
17N104W 1004 MB. WITHIN 90 NM OF LOW CENTER WINDS 20 TO 30 KT.
SEAS 8 TO 11 FT. WITHIN 90 NM EITHER SIDE OF LINE FROM 13N101W
TO 09N120W SW TO W WINDS 20 TO 25 KT. SEAS 8 TO 10 FT.

.POST-TROPICAL REMNANT LOW OTIS NEAR 16N133W 1011 MB. WITHIN 150
NM NW QUADRANT N TO NE WINDS 20 TO 25 KT. SEAS TO 8 FT.
.24 HOUR FORECAST LOW DISSIPATED. WINDS 20 KT OR LESS. SEAS LESS
THAN 8 FT.

.N OF 25N BETWEEN 118W AND 127W WINDS 20 KT OR LESS. SEAS 8 TO
9 FT IN NW SWELL.
.24 HOUR FORECAST WINDS 20 KT OR LESS. SEAS LESS THAN 8 FT.

.GULF OF CALIFORNIA N OF 30N SW WINDS 20 TO 25 KT. SEAS LESS
THAN 8 FT.
.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 1500 UTC THU SEP 21...

INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...

MONSOON TROUGH FROM 08N78W TO LOW PRES NEAR 17N103W 1008 MB TO
14N107W TO 11N127W TO 12N140W. SCATTERED MODERATE TO STRONG FROM
13N TO 19N BETWEEN 101W AND 107W. SCATTERED MODERATE ISOLATED
STRONG FROM 10N TO 12N BETWEEN 93W AND 96W. SCATTERED MODERATE
WITHIN 120 NM S OF AXIS W OF 112W.

$$
.FORECASTER MUNDELL. NATIONAL HURRICANE CENTER.



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