North Pacific High Seas Forecast

Hurricane Warnings in Effect
North Pacific High Seas Forecast

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FZPN01 KWBC 232222
HSFEP1

HIGH SEAS FORECAST
NWS OCEAN PREDICTION CENTER WASHINGTON DC
2230 UTC WED SEP 23 2020

SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS 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. 

ONLY YOU KNOW THE WEATHER AT YOUR POSITION. REPORT IT TO THE 
NATIONAL WEATHER SERVICE. EMAIL US AT 
VOSOPS@NOAA.GOV(LOWERCASE).

SECURITE

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

ALL FORECASTS VALID OVER ICE FREE FORECAST WATERS

SYNOPSIS VALID 1800 UTC SEP 23. 
24 HOUR FORECAST VALID 1800 UTC SEP 24.
48 HOUR FORECAST VALID 1800 UTC SEP 25.

.WARNINGS.

...GALE WARNING...
.COMPLEX LOW WITH FIRST CENTER 57N138W 983 MB MOVING NW 15 KT
NEXT 12 HOURS THEN WILL MOVE W AND SECOND CENTER 58N146W 982 MB
MOVING SW 15 KT. WITHIN 90 NM NE SEMICIRCLE OF FIRST CENTER AND
120 NM E OF A FRONT FROM 48N126W TO 42N128W TO 38N133W WINDS 25
TO 35 KT. SEAS 10 TO 17 FT. ELSEWHERE WITHIN 660 NM W AND 120 NM
N QUADRANTS OF SECOND CENTER AND N AND E OF A LINE FROM  SECOND
CENTER TO FIRST CENTER  TO 50N129W WINDS 20 TO 30 KT. SEAS 8 TO
16 FT. 
.24 HOUR FORECAST LOW 59N147W 983 MB. WITHIN 600 NM W...540 NM
S...AND 180 NM N AND NE QUADRANTS WINDS 20 TO 30 KT. SEAS TO 9
FT.
.48 HOUR FORECAST LOW 57N151W 989 MB. WITHIN 480 NM SW SEMICIRCLE
WINDS TO 25 KT. SEAS TO 9 FT. 

...GALE WARNING...
.LOW 53N142W 978 MB MOVING NE 10 KT. WITHIN 780 NM SW SEMICIRCLE
WINDS 25 TO 40 KT. SEAS 12 TO 24 FT.
.24 HOUR FORECAST LOW 55N140W 986 MB. WITHIN 480 NM S AND SE
QUADRANTS WINDS 25 TO 35 KT. SEAS 10 TO 19 FT. 
.48 HOUR FORECAST LOW 57N142W 990 MB. WITHIN 180 NM NE...360 NM
E...AND 600 NM S QUADRANTS WINDS 20 TO 30 KT. SEAS 8 TO 11 FT.

...GALE WARNING...
.COMPLEX LOW WITH FIRST CENTER 47N174W 1003 MB MOVING E 30 KT AND
SECOND CENTER 45N164W 1006 MB MOVING E 30 KT. FROM 39N TO 49N
BETWEEN 160W AND 177E WINDS 25 TO 35 KT. SEAS 8 TO 13 FT.
.24 HOUR FORECAST COMPLEX LOW WITH FIRST CENTER 45N141W 1000 MB
AND SECOND CENTER 45N153W 1005 MB. WITHIN 360 NM SE SEMICIRCLE OF
FIRST CENTER AND 300 NM S OF A LINE FROM FIRST CENTER TO 42N161W
WINDS 25 TO 35 KT. SEAS 9 TO 17 FT 
.48 HOUR FORECAST LOW 49N123W 1000 MB. WITHIN 420 NM W AND SW
QUADRANTS AND 240 NM S OF A LINE FROM 45N125W TO 43N148W WINDS 20
TO 30 KT. SEAS 9 TO 16 FT.

...GALE WARNING...
.LOW W OF AREA NEAR 30N157E 1008 MB MOVING NW 10 KT. WITHIN 420
NM NE QUADRANT WINDS 20 TO 30 KT. SEAS 8 TO 12 FT.
.24 HOUR FORECAST LOW W OF AREA NEAR 33N155E 1007 MB. FROM 30N
TO 36N W OF 165E WINDS 20 TO 30 KT. SEAS 8 TO 11 FT.
.48 HOUR FORECAST LOW DISSIPATED. CONDITIONS DESCRIBED WITH LOW
38N176E.

...GALE WARNING...
.24 HOUR FORECAST WITHIN 240 NM N OF A LINE FROM 37N160E TO
39N172E WINDS 20 TO 30 KT. SEAS 8 TO 11 FT.
.48 HOUR FORECAST NEW LOW 38N176E 1006 MB. WITHIN 240 NM S AND SE
QUADRANTS WINDS 25 TO 35 KT. SEAS 8 TO 12 FT. ELSEWHERE WITHIN
360 NM NW QUADRANT AND 180 NM S AND 360 NM N OF A LINE FROM LOW
CENTER TO 36N167E TO 35N160E WINDS 20 TO 30 KT. SEAS 8 TO 12 FT.

.SYNOPSIS AND FORECAST.

.FROM 34N TO 36N E OF 123W AREA OF N TO NW WINDS TO 25 KT. SEAS
TO 8 FT.
.24 HOUR FORECAST FROM 31N TO 36N BETWEEN 120W AND 124W AREA OF N
TO NW WINDS TO 25 KT. SEAS TO 9 FT.
.48 HOUR FORECAST FROM 30N TO 39N BETWEEN 118W AND 125W AREA OF
N TO NW WINDS TO 25 KT. SEAS 8 TO 13 FT.

.24 HOUR FORECAST LOW 50N179E 1009 MB. WITHIN 240 NM SW
SEMICIRCLE WINDS 20 TO 30 KT. SEAS TO 10 FT.
.48 HOUR FORECAST LOW 48N171W 1006 MB. WITHIN 300 NM S AND SW
QUADRANTS WINDS TO 25 KT. SEAS TO 8 FT.

.48 HOUR FORECAST NEW LOW 44N150W 1006 MB. WITHIN 360 NM S
QUADRANT AND 360 NM S OF A LINE FROM LOW CENTER TO 40N175W WINDS
20 TO 30 KT. SEAS TO 12 FT.

.48 HOUR FORECAST NEW LOW 56N177E 1003 MB. WITHIN 480 NM W AND SW
QUADRANTS WINDS 20 TO 30 KT. SEAS TO 10 FT.

.48 HOUR FORECAST N OF 61N AND W OF THE ALASKAN COAST N WINDS 20
TO 30 KT. SEAS TO 10 FT.

.HIGH 31N132W 1023 MB NEARLY STATIONARY.
.24 HOUR FORECAST LITTLE CHANGE.
.48 HOUR FORECAST HIGH DISSIPATED.

.HIGH 35N164W 1025 MB MOVING E 20 KT.
.24 HOUR FORECAST HIGH 34N155W 1026 MB.
.48 HOUR FORECAST HIGH 34N143W 1026 MB.

.HIGH 55N176E 1019 MB MOVING S 05 KT.
.24 HOUR FORECAST HIGH DISSIPATED.

.48 HOUR FORECAST NEW HIGH 31N177E 1021 MB.

.FORECASTER ACHORN. OCEAN PREDICTION CENTER.

NWS NATIONAL HURRICANE CENTER MIAMI FL
ISSUED BY NATIONAL WEATHER SERVICE HONOLULU HI
 
E PACIFIC FROM THE EQUATOR TO 30N E OF 140W AND 03.4S TO THE 
EQUATOR E OF 120W

SYNOPSIS VALID 1800 UTC WED SEP 23
24 HOUR FORECAST VALID 1800 UTC THU SEP 24
48 HOUR FORECAST VALID 1800 UTC FRI SEP 25

.WARNINGS.

...TROPICAL STORM WARNING...
.TROPICAL STORM LOWELL NEAR 20.7N 122.1W 1001 MB AT 2100 UTC SEP
23 MOVING WNW OR 280 DEG AT 10 KT. MAXIMUM SUSTAINED WINDS 45 KT
GUSTS 55 KT. TROPICAL STORM FORCE WINDS WITHIN 80 NM E 
SEMICIRCLE...0
NM W SEMICIRCLE. SEAS 12 FT OR GREATER WITHIN 150 NM NW...120 NM 
SE 
QUADRANT...30 NM SW QUADRANT...AND 120 NM NW QUADRANT WITH SEAS
TO 20 FT. ELSEWHERE FROM 18N TO 24N BETWEEN 117W AND 127W WINDS 
20
TO 33 KT. SEAS 8 TO 14 FT. 
.24 HOUR FORECAST TROPICAL STORM LOWELL NEAR 21.4N 125.4W.
MAXIMUM SUSTAINED WINDS 40 KT GUSTS 50 KT. TROPICAL STORM FORCE 
WINDS
WITHIN 70 NM NE QUADRANT...60 NM SE QUADRANT...50 NM SW 
QUADRANT...AND 0
NM NW QUADRANT. SEAS 12 FT OR GREATER WITHIN 120 NM OF CENTER 
WITH
SEAS TO 20 FT. ELSEWHERE FROM 18N TO 25N BETWEEN 121W AND 130W 
WINDS
20 TO 33 KT AND SEAS 10 TO 14 FT. 
.48 HOUR FORECAST TROPICAL STORM LOWELL NEAR 21.6N 127.4W.
MAXIMUM SUSTAINED WINDS 40 KT GUSTS 50 KT. TROPICAL STORM FORCE 
WINDS
WITHIN 50 NM S SEMICIRCLE...70 NM NE QUADRANT AND 0 NM NW 
QUADRANT. SEAS
12 FT OR GREATER WITHIN 120 NM OF CENTER WITH SEAS TO 18 FT.
ELSEWHERE FROM 20N TO 28N BETWEEN 126W TO 136W WINDS 20 TO 33 KT 
AND SEAS 8
TO 12 FT.
.72 HOUR FORECAST TROPICAL STORM LOWELL NEAR 21.6N 131.9W.
MAXIMUM SUSTAINED WINDS 35 KT GUSTS 45 KT. EXTENDED 
OUTLOOK...USE FOR 
GUIDANCE ONLY...ERRORS MAY BE LARGE.
.96 HOUR FORECAST POST-TROPICAL REMNANT LOW LOWELL NEAR 21.2N 
139.0W. MAXIMUM SUSTAINED WINDS 30 KT GUSTS 40 KT.
.120 HOUR FORECAST POST-TROPICAL REMNANT LOW LOWELL NEAR 21.7N 
144.0W. MAXIMUM SUSTAINED WINDS 25 KT GUSTS 35 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.

.FROM 05N TO 09N BETWEEN 90W AND 100W S TO SW WINDS 20 TO 25 KT 
AND SEAS 8 FT.
.24 HOUR FORECAST FROM 06N TO 10N BETWEEN 95N AND 105N S TO SW
WINDS 20 TO 25 KT AND SEAS 8 FT.
.48 HOUR FORECAST CONDITIONS IMPROVE. WINDS 20 KT OR LESS. SEAS
LESS THAN 8 FT.

.12 HOUR FORECAST SEAS 8 TO 12 FT IN NW TO N SWELL NW OF A LINE
FROM 30N135W TO 26N140W.  
.24 HOUR FORECAST SEAS OTHERWISE 8 TO 12 FT IN NW TO N SWELL NW
OF A LINE FROM 30N130W TO 23N140W. 
.48 HOUR FORECAST SEAS OTHERWISE 8 TO 12 FT IN NW TO N SWELL NW
OF A LINE FROM 30N120W TO 04N140W.

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

CONVECTION VALID AT 1500 UTC WED SEP 23...

.TROPICAL STORM LOWELL...NUMEROUS MODERATE TO STRONG WITHIN 150 
NM SOUTH SEMICIRCLE AND SCATTERED MODERATE ISOLATED STRONG  
WITHIN 60 NM NORTH SEMICIRCLE.

.INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...
MONSOON TROUGH AXIS EXTENDS FROM THE COAST OF COSTA RICA NEAR 
10N84W TO 11N93W TO 11N112W. THE MONSOON TROUGH CONTINUES SW OF 
LOWELL NEAR 14N126W TO 10N140W. SCATTERED MODERATE TO STRONG 
CONVECTION NOTED FROM 03N TO 14N E OF 115W. SCATTERED MODERATE 
CONVECTION NOTED FROM 08N TO 12N BETWEEN 130W AND 140W.  



.FORECASTER MORRISON

$$