High Seas Forecast
Issued by NWS

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299
FZPN01 KWBC 230935
HSFEP1

HIGH SEAS FORECAST
NWS OCEAN PREDICTION CENTER WASHINGTON DC
1030 UTC MON APR 23 2018

SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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.

SEE ANNOUNCEMENT OF PLANNED INMARSAT I-3 TO I-4 MIGRATION
IN 2018 AT OCEAN.WEATHER.GOV/GMDSS_NOTICE.PHP (LOWERCASE).

SECURITE

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

SYNOPSIS VALID 0600 UTC APR 23.
24 HOUR FORECAST VALID 0600 UTC APR 24.
48 HOUR FORECAST VALID 0600 UTC APR 25.

.WARNINGS.

...STORM WARNING...
.LOW 52N174E 974 MB MOVING NE 15 KT. OVER FORECAST WATERS WITHIN
360 NM SE AND 480 NM S QUADRANTS WINDS 35 TO 50 KT. SEAS 14 TO
30 FT. ELSEWHERE NW OF A LINE FROM 40N160E TO 52N164W AND WITHIN
420 NM SE OF A FRONT EXTENDING FROM 52N169W TO 37N170E WINDS 25
TO 40 KT. SEAS 10 TO 20 FT.
.24 HOUR FORECAST LOW 55N175W 967 MB. FROM 38N TO 54N W OF 168W
WINDS 25 TO 40 KT. SEAS 10 TO 23 FT.
.48 HOUR FORECAST LOW DISSIPATED AND CONDITIONS DESCRIBED WITH
FIRST GALE WARNING BELOW.

...GALE WARNING...
.LOW 58N171W 985 MB MOVING SW 15 KT. OVER ICE FREE FORECAST
WATERS WITHIN 360 NM NW SEMICIRCLE AND 240 NM SE QUADRANT WINDS
25 TO 40 KT. SEAS 8 TO 15 FT...HIGHEST NW.
.24 HOUR FORECAST LOW 55N178E 970 MB. WITHIN 600 NM N AND 360 NM
NW QUADRANTS WINDS 25 TO 35 KT. SEAS 9 TO 18 FT...HIGHEST NW.
.48 HOUR FORECAST LOW 57N168W 978 MB. WITHIN 600 NM SE AND 840
NM S QUADRANTS WINDS 30 TO 40 KT. SEAS 14 TO 23 FT. ELSEWHERE
WITHIN 900 NM E AND SE AND 1020 NM SW QUADRANTS WINDS 25 TO 35
KT. SEAS 10 TO 18 FT.

...GALE WARNING...
.LOW 55N152W 992 MB MOVING N 15 KT. FRONT EXTENDS FROM 60N148W
TO 56N140W TO 50N138W TO 40N140W. OVER FORECAST WATERS N OF 53N
WITHIN 240 NM N AND E OF THE FRONT WINDS 35 TO 45 KT. SEAS 12 TO
20 FT. ELSEWHERE S OF 53W WITHIN 300 NM E AND SE OF THE FRONT
AND WITHIN 660 NM S AND 420 NM SW QUADRANTS WINDS 25 TO 35 KT.
SEAS 9 TO 18 FT. OTHERWISE FROM 32N TO 60N W OF FRONT TO 163W
WINDS TO 25 KT. SEAS 8 TO 16 FT.
.24 HOUR FORECAST LOW DISSIPATED INLAND. FROM 44N TO 60N BETWEEN
127W AND 150W WINDS TO 25 KT. SEAS 8 TO 13 FT.

...GALE WARNING...
.24 HOUR FORECAST NEW LOW 57N165W 980 MB. FRONT TO EXTEND FROM
LOW CENTER TO 50N164W TO 35N176W. OVER ICE FREE FORECAST WATERS
WITHIN 360 NM NE QUADRANT AND WITHIN 480 NM E OF THE FRONT WINDS
25 TO 40 KT. SEAS 10 TO 20 FT...EXCEPT SEAS TO 9 FT IN THE
BERING SEA.
.48 HOUR FORECAST LOW 62N172W 970 MB. WITHIN 420 NM OF LOW
CENTER WINDS 20 TO 30 KT. SEAS TO 12 FT.

...HEAVY FREEZING SPRAY WARNING...
.MODERATE TO HEAVY FREEZING SPRAY OVER ICE FREE FORECAST WATERS
N OF 62N W OF ALASKA.
.24 HOUR FORECAST LITTLE CHANGE.
.48 HOUR FORECAST LITTLE CHANGE.

.SYNOPSIS AND FORECAST.

.OVER FORECAST WATERS FROM 35N TO 44N BETWEEN 122W AND 128W AREA
OF NW TO N WINDS 20 TO 30 KT. SEAS 8 TO 13 FT.
.24 HOUR FORECAST CONDITIONS DIMINISHED.

.LOW 36N171E 1012 MB MOVING NE 35 KT. FRONT EXTENDS FROM 37N173E
TO LOW CENTER TO 33N167E. WITHIN 360 NM E OF FRONT WINDS 20 TO
30 KT. SEAS TO 9 FT.
.24 HOUR FORECAST LOW DISSIPATED AND CONDITIONS DESCRIBED IN
WARNINGS SECTION ABOVE.

.48 HOUR FORECAST NEW LOW 38N137W 1020 MB. WITHIN 300 NM W AND
NW QUADRANTS WINDS 20 TO 30 KT. SEAS 8 TO 13 FT.

.48 HOUR FORECAST NEW LOW W OF AREA 42N159E 1018 MB. FROM 38N TO
43N W OF 164E WINDS 20 TO 30 KT. SEAS TO 10 FT.

.DENSE FOG. VSBY OCCASIONALLY LESS THAN 1 NM WITHIN 150 NM E AND
SE OF A LINE FROM 46N177W TO 40N175E TO 33N171E.
.24 HOUR FORECAST DENSE FOG WITHIN AREA BOUNDED BY 41N168W TO
51N156W TO 52N163W TO 41N168W.
.48 HOUR FORECAST CONDITIONS IMPROVED.

.DENSE FOG. VSBY OCCASIONALLY LESS THAN 1 NM WITHIN 90 NM OF
46N138W.
.24 HOUR FORECAST CONDITIONS IMPROVED.

.HIGH 46N127W 1029 MB MOVING N 05 KT.
.24 HOUR FORECAST HIGH 50N127W 1025 MB.
.48 HOUR FORECAST HIGH DISSIPATED.

.HIGH 37N133W 1025 MB MOVING SW 25 KT.
.24 HOUR FORECAST HIGH DISSIPATED.

.HIGH 35N166W 1029 MB MOVING NE 30 KT.
.24 HOUR FORECAST HIGH 39N152W 1033 MB.
.48 HOUR FORECAST HIGH 39N150W 1035 MB.

.24 HOUR FORECAST HIGH 38N161E 1030 MB.
.48 HOUR FORECAST HIGH 37N174E 1034 MB.

.FORECASTER HUFFMAN. 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 0600 UTC MON APR 23.
24 HOUR FORECAST VALID 0600 UTC TUE APR 24.
48 HOUR FORECAST VALID 0600 UTC WED APR 25.

.WARNINGS.

.NONE.

.SYNOPSIS AND FORECAST.

.W OF LINE FROM 21N140W TO 15N131W TO 11N130W TO 09N140W WINDS
20 KT OR LESS. SEAS 8 FT IN MIXED NE AND NW SWELL.
.24 HOUR FORECAST W OF LINE FROM 17N140W TO 13N128W TO 09N131W
WINDS 20 KT OR LESS. SEAS 8 FT IN MIXED NE AND NW SWELL.
.48 HOUR FORECAST W OF LINE FROM 17N140W TO 14N128W TO 11N130W
TO 09N137W WINDS 20 KT OR LESS. SEAS 8 FT IN MIXED NE AND NW
SWELL.

.N OF 28.5N BETWEEN 122W AND 130W WINDS 20 KT OR LESS. SEAS 8 FT
IN NW SWELL.
.12 HOUR FORECAST WINDS 20 KT OR LESS. SEAS LESS THAN 8 FT.

.FROM 10.5N TO 11.5N E OF 88W...INCLUDING GULF OF PAPAGAYO...NE
WINDS 20 TO 25 KT. SEAS LESS THAN 8 FT.
.12 HOUR FORECAST WINDS 20 KT OR LESS. SEAS LESS THAN 8 FT.
.24 HOUR FORECAST FROM 10.5N TO 11.5N E OF 87.5W...INCLUDING
GULF OF PAPAGAYO...NE WINDS 20 TO 25 KT. SEAS LESS THAN 8 FT.
.30 HOUR FORECAST WINDS 20 KT OR LESS. SEAS LESS THAN 8 FT.
.42 HOUR FORECAST FROM 10.5N TO 11.5N E OF 87.5W...INCLUDING
GULF OF PAPAGAYO...NE WINDS 20 TO 25 KT. SEAS LESS THAN 8 FT.
.48 HOUR FORECAST LITTLE CHANGE.

.S OF 02S W OF 100W WINDS 20 KT OR LESS. SEAS 8 FT IN SW SWELL.
.24 HOUR FORECAST S OF 00N W OF 85W WINDS 20 KT OR LESS. SEAS 8
TO 9 FT IN SW SWELL.
.48 HOUR FORECAST S OF 00N W OF 90W WINDS 20 KT OR LESS. SEAS 8
FT IN SW SWELL.

.24 HOUR FORECAST COLD FRONT APPROACH 30N140W. N OF 29N W OF
139W WINDS 20 KT OR LESS. SEAS 8 FT IN FRESH NW SWELL.
.48 HOUR FORECAST WEAKENING COLD FRONT FROM 30N135W TO BEYOND
27N140W. NW OF FRONT WINDS 20 KT OR LESS. SEAS 8 TO 9 FT IN NW
SWELL.

.24 HOUR FORECAST GULF OF TEHUANTEPEC N OF 14.5N BETWEEN 94.5W
AND 95W N WINDS 20 TO 25 KT. SEAS TO 8 FT.
.36 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 0845 UTC MON APR 23...

.INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...
TROUGH FROM 10N73W TO 09N80W TO 06N87W TO 05N95W. ITCZ CONTINUES
FROM 05N95W TO 06N113W TO BEYOND 05N140W. SCATTERED MODERATE
ISOLATED STRONG FROM 03N TO 10N BETWEEN 76W AND 87W AND WITHIN
AREA BOUNDED BY 11N109W TO 15N116W TO 05N131W TO 05N108W TO
11N109W. SCATTERED MODERATE FROM 08N TO 12N W OF 130W.

$$
.FORECASTER MCELROY. NATIONAL HURRICANE CENTER.



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