High Seas Forecast
Issued by NWS

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000
FZPN01 KWBC 210356
HSFEP1

HIGH SEAS FORECAST
NWS OCEAN PREDICTION CENTER WASHINGTON DC
0430 UTC SAT APR 21 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 0000 UTC APR 21.
24 HOUR FORECAST VALID 0000 UTC APR 22.
48 HOUR FORECAST VALID 0000 UTC APR 23.

.WARNINGS.

...STORM WARNING...
.LOW 48N174W 982 MB MOVING NE 25 KT. WITHIN 360 NM S AND 240 NM
SW QUADRANTS WINDS 40 TO 50 KT. SEAS 15 TO 30 FT. ELSEWHERE
WITHIN 300 NM N...840 NM E...780 NM S...AND 540 NM W QUADRANTS
WINDS 25 TO 40 KT. SEAS 12 TO 25 FT.
.24 HOUR FORECAST LOW 52N159W 984 MB. BETWEEN 180 NM AND 600 NM
S QUADRANT WINDS 30 TO 40 KT. SEAS 18 TO 30 FT. ELSEWHERE WITHIN
240 NM NW...660 NM NE...AND 900 NM S SEMICIRCLE WINDS 25 TO 35
KT. SEAS 11 TO 22 FT.
.48 HOUR FORECAST LOW DISSIPATED WITH NEW LOW TO FORM 55N152W
991 MB. FRONT TO EXTEND FROM 60N148W TO 55N141W TO 48N140W TO
36N147W. OVER FORECAST WATERS WITHIN 300 NM E AND SE OF FRONT
WINDS 25 TO 40 KT. SEAS 9 TO 17 FT. ELSEWHERE WITHIN 300 NM NE
AND E...780 NM S...AND 600 NM SW QUADRANTS WINDS 20 TO 30 KT.
SEAS 10 TO 18 FT.

...STORM WARNING...
.LOW 53N132W 1004 MB MOVING NE 20 KT. OVER FORECAST WATERS
WITHIN 180 NM NE AND E QUADRANTS WINDS 35 TO 50 KT. SEAS 9 TO 18
FT. ELSEWHERE WITHIN 240 NM EITHER SIDE OF FRONT EXTENDING FROM
THE LOW CENTER TO 47N129W TO 42N130W WINDS 25 TO 35 KT. SEAS 8
TO 15 FT.
.24 HOUR FORECAST LOW INLAND WITH CONDITIONS DIMINISHED.

...STORM WARNING...
.18 HOUR FORECAST LOW W OF AREA 49N156E 991 MB. OVER FORECAST
WATERS FROM 40N TO 51N W OF 165E WINDS 25 TO 35 KT. SEAS TO 10
FT.
.24 HOUR FORECAST LOW 49N160E 987 MB. FROM 39N TO 52N W OF 170E
WINDS 25 TO 40 KT. SEAS 8 TO 13 FT.
.36 HOUR FORECAST LOW 51N165E 981 MB. WITHIN 300 NM S AND 240 NM
W QUADRANTS WINDS 40 TO 50 KT. SEAS 12 TO 18 FT.
.48 HOUR FORECAST LOW 51N171E 978 MB. WITHIN 420 NM S SEMICIRCLE
WINDS 35 TO 45 KT. SEAS 13 TO 26 FT. ELSEWHERE N OF 43N W OF A
LINE FROM 43N166W TO 59N179E AND WITHIN 360 NM SE OF A FRONT TO
EXTEND FROM 45N177E TO 33N168E WINDS 25 TO 35 KT. SEAS 9 TO 18
FT N OF 43N AND SEAS TO 10 FT SE OF FRONT.

...GALE WARNING...
.FROM 33N TO 40N E OF 125W AREA OF NW TO N WINDS 20 TO 30 KT.
SEAS TO 9 FT.
.24 HOUR FORECAST FROM 33N TO 43N BETWEEN 121W AND 128W WINDS 25
TO 35 KT. SEAS 8 TO 13 FT.
.48 HOUR FORECAST FROM 35N TO 45N BETWEEN 122W AND 128W WINDS 25
TO 35 KT. SEAS 8 TO 13 FT.

...GALE WARNING...
.LOW INLAND 62N156W 997 MB MOVING SW 15 KT. FROM 46N TO 53N
BETWEEN 141W AND 154W AREA OF SW TO W WINDS TO 25 KT. SEAS 9 TO
14 FT. ALSO OVER ICE FREE FORECAST WATERS N OF 61N AREA OF N TO
NE WINDS 20 TO 30 KT. SEAS TO 9 FT.
.24 HOUR FORECAST LOW 57N166W 994 MB. WITHIN 540 NM NW QUADRANTS
WINDS 20 TO 30 KT. SEAS TO 10 FT.
.48 HOUR FORECAST LOW DISSIPATED WITH NEW LOW TO FORM 58N168W
987 MB. WITHIN 240 NM S QUADRANT AND N OF 58N W OF 162W WINDS 25
TO 35 KT. SEAS TO 11 FT.

...HEAVY FREEZING SPRAY WARNING...
.MODERATE TO HEAVY FREEZING SPRAY OVER ICE FREE FORECAST WATERS
N OF 61N W OF ALASKA.
.24 HOUR FORECAST LIGHT TO MODERATE FREEZING SPRAY N OF 61N W OF
ALASKA.
.48 HOUR FORECAST LIGHT TO MODERATE FREEZING SPRAY N OF 63N.

.SYNOPSIS AND FORECAST.

.24 HOUR FORECAST LOW W OF AREA 31N159E 1010 MB. OVER FORECAST
WATERS S OF 35N W OF 165E WINDS TO 25 KT. SEAS TO 9 FT.
.48 HOUR FORECAST LOW DISSIPATED AND CONDITIONS DESCRIBED IN
THIRD STORM WARNING ABOVE.

.DENSE FOG. VSBY OCCASIONALLY 1 NM OR LESS FROM 45N TO 49N
BETWEEN 163W AND 170W.
.24 HOUR FORECAST DENSE FOG FROM 39N TO 44N BETWEEN 146W AND
151W.
.48 HOUR FORECAST DENSE FOG WITHIN 120 NM E OF A LINE FROM
52N140W TO 40N142W.

.DENSE FOG. 48 HOUR FORECAST VSBY OCCASIONALLY 1 NM OF LESS
WITHIN 150 NM SE OF A LINE FROM 43N177E TO 39N172E.

.HIGH 34N138W 1029 MB NEARLY STATIONARY.
.24 HOUR FORECAST HIGH DISSIPATED.

.HIGH 38N145W 1031 MB MOVING NE 25 KT.
.24 HOUR FORECAST HIGH 43N132W 1033 MB.
.48 HOUR FORECAST HIGH 46N128W 1030 MB.

.HIGH 36N172E 1022 MB MOVING E 15 KT.
.24 HOUR FORECAST HIGH DISSIPATED.

.HIGH 30N179E 1023 MB MOVING E 25 KT.
.24 HOUR FORECAST HIGH DISSIPATED.

.24 HOUR FORECAST NEW HIGH 37N176E 1026 MB.
.48 HOUR FORECAST HIGH 36N169W 1029 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 0000 UTC SAT APR 21.
24 HOUR FORECAST VALID 0000 UTC SUN APR 22.
48 HOUR FORECAST VALID 0000 UTC MON APR 23.

.WARNINGS.

.NONE.

.SYNOPSIS AND FORECAST.

.WITHIN 30 NM OF LINE FROM 16N95W TO 14.5N95W...INCLUDING GULF
OF TEHUANTEPEC...N TO NE WINDS 20 TO 30 KT. SEAS 8 TO 11 FT.
ELSEWHERE WITHIN AREA BOUNDED BY 16N95W TO 15N94W TO 09N95W TO
09N101W TO 16N95W WINDS 20 KT OR LESS. SEAS 8 TO 9 FT IN MIXED N
TO NE AND SW SWELL.
.18 HOUR FORECAST WINDS 20 KT OR LESS. SEAS LESS THAN 8 FT.

.FROM 08N TO 13N W OF 138W NE WINDS 20 TO 25 KT. SEAS 9 FT.
ELSEWHERE W OF LINE FROM 22N140W TO 14N112W TO 11N112W TO
08N120W TO 05N140W WINDS 20 KT OR LESS. SEAS 8 TO 9 FT IN MIXED
SWELL.
.24 HOUR FORECAST FROM 10N TO 14N W OF 138W NE WINDS 20 TO 25
KT. SEAS 9 TO 10 FT. ELSEWHERE W OF LINE FROM 30N135W TO 12N123W
TO 08N127W TO 07N140W WINDS 20 KT OR LESS. SEAS 8 TO 9 FT IN
MIXED SWELL.
.48 HOUR FORECAST W OF LINE FROM 22N140W TO 13N126W TO 10N131W
TO 08N140W WINDS 20 KT OR LESS. SEAS 8 TO 9 FT IN MIXED SWELL.

.WITHIN 30 NM OF LINE FROM 11N86W TO 10.5N88.5W...INCLUDING GULF
OF PAPAGAYO...NE WINDS 20 TO 25 KT. SEAS TO 8 FT IN MIXED NE AND
SW SWELL.
.24 HOUR FORECAST LITTLE CHANGE.
.42 HOUR FORECAST WINDS 20 KT OR LESS. SEAS LESS THAN 8 FT.
.48 HOUR FORECAST WITHIN 15 NM OF LINE FROM 11N86W TO
11N88W...INCLUDING GULF OF PAPAGAYO...NE WINDS 20 TO 25 KT. SEAS
LESS THAN 8 FT.

.18 HOUR FORECAST N OF 29N BETWEEN 120W AND 131W WINDS 20 KT OR
LESS. SEAS 8 FT IN NW SWELL.
.24 HOUR FORECAST N OF LINE FROM 29N120W TO 27.5N132W WINDS 20
KT OR LESS. SEAS 8 TO 9 FT IN NW SWELL.
.48 HOUR FORECAST N OF 27.5N BETWEEN 120W AND 132W WINDS 20 KT
OR LESS. SEAS 8 TO 9 FT IN NW SWELL.

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

CONVECTION VALID AT 0245 UTC SAT APR 21...

.INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...
TROUGH FROM 07N77W TO 06N86W TO 05N113W. ITCZ CONTINUES FROM
05N113W TO 05N125W TO BEYOND 06N140W. SCATTERED MODERATE
ISOLATED STRONG FROM 05N TO 07N BETWEEN 86W AND 91W AND FROM 05N
TO 09N BETWEEN 105W AND 112W.

$$
.FORECASTER MCELROY. NATIONAL HURRICANE CENTER.



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