113
FNAK72 PAFC 201948
FWSALU
SPOT FORECAST FOR SH-26-07 ECOFOCI - M8 TO M4...NOAAS BELL M. SHIMADA
NATIONAL WEATHER SERVICE ANCHORAGE AK
1148 AM AKDT THU AUG 20 2026
FORECAST IS BASED ON FORECAST START TIME OF 0000 AKDT ON AUGUST 21.
DISCUSSION
A STRENGTHENING LOW WILL DEVELOP OFF OF THE KAMCHATKA COASTLINE
SOUTH OF THE GULF OF ANADYR THIS AFTERNOON AROUND 1002 MB,
DEEPENING TO ~1000 MB JUST SOUTH OF ST. MATTHEW ISLAND FRIDAY
MORNING AND EVENTUALLY BOTTOMING OUT IN THE NORTON SOUND SATURDAY
EVENING AT ~997 MB. FOR THE VESSEL, SOUTH-SOUTHWESTERLY WINDS
TONIGHT WILL BECOME NORTH-NORTHWEST TOMORROW AS THE STORM CENTER PASSES
TO THE EAST. THERE MAY BE A BRIEF PERIOD OF CONFUSED SEAS FRIDAY
MORNING AS SOUTHERLY SWELL FROM THE PAST DAY INTERACTS WITH
DEVELOPING NORTHWESTERLY SWELL. WIND WAVES AND SWELL WILL THEN
BECOME UNIFORM IN DIRECTION THROUGH SATURDAY MORNING OUT OF THE
NORTHWEST. RAIN IS EXPECTED THROUGH FRIDAY MORNING. HIGHER
PRESSURE BEHIND THE STORM MAY LEAD TO FOG DEVELOPMENT. A STRONGER STORM
DEVELOPS IN THE GULF OF ANADYR AND MOVES INTO THE STRAIT ON MONDAY. THIS
THIS STORM WILL BE CAPABLE OF WIDESPREAD 25 TO 35 KT BY SUNDAY.
REST OF TONIGHT
SKY/WEATHER.........CLOUDY (90-100 PERCENT). RAIN OVERNIGHT, THEN
RAIN LIKELY AFTER 3 AM.
CHANCE OF PCPN......90 PERCENT.
MIN TEMPERATURE.....AROUND 50.
MAX HUMIDITY........96 PERCENT.
SURFACE WINDS (KTS).SOUTHWEST WINDS 12 TO 19 KNOTS DECREASING TO 6
TO 9 KNOTS AFTER 3 AM.
WAVE HEIGHT.........5 FEET.
SEA SURFACE TEMP....50F
TIME (AKDT) MIDNGT 3 AM
SKY (%).........100 100
WEATHER COV.....DEFNTE DEFNTE
WEATHER TYPE....RAIN RAIN
CHC OF PCPN (%).90 90
TEMP............51 50
RH..............95 94
SFC WIND (KTS)..SW 19G21 SW 17G18
WAVE HEIGHT (FT)5 5
SST (C).........50F
FRIDAY
SKY/WEATHER.........CLOUDY (85-95 PERCENT). RAIN LIKELY EARLY IN
THE MORNING. SLIGHT CHANCE OF RAIN LATE
IN THE AFTERNOON.
CHANCE OF PCPN......70 PERCENT.
MAX TEMPERATURE.....AROUND 53.
MIN HUMIDITY........89 PERCENT.
SURFACE WINDS (KTS).SOUTHWEST WINDS 6 TO 9 KNOTS SHIFTING TO THE
NORTHWEST 10 TO 19 KNOTS.
WAVE HEIGHT.........5 FEET.
SEA SURFACE TEMP....50F
TIME (AKDT) 6 AM 9 AM NOON 3 PM
SKY (%).........94 93 89 86
WEATHER COV.....LIKELY CHANCE CHANCE CHANCE
WEATHER TYPE....RAIN RAIN RAIN RAIN
CHC OF PCPN (%).70 50 20 20
TEMP............50 50 52 53
RH..............94 94 93 92
SFC WIND (KTS)..SW 9G10 NW 12G14 NW 18G21 NW 19G22
WAVE HEIGHT (FT)5 4 4 5
SST (C).........50F
FRIDAY NIGHT
SKY/WEATHER.........MOSTLY CLOUDY (70-80 PERCENT). SLIGHT CHANCE OF
RAIN IN THE EVENING.
CHANCE OF PCPN......20 PERCENT.
MIN TEMPERATURE.....AROUND 48.
MAX HUMIDITY........92 PERCENT.
SURFACE WINDS (KTS).NORTH WINDS 13 TO 20 KNOTS.
WAVE HEIGHT.........7 FEET.
SEA SURFACE TEMP....50F
TIME (AKDT) 6 PM 9 PM MIDNGT 3 AM
SKY (%).........83 82 71 77
WEATHER COV.....S CHC S CHC S CHC
WEATHER TYPE....RAIN RAIN RAIN NONE
CHC OF PCPN (%).20 10 10 10
TEMP............52 49 49 49
RH..............90 88 86 84
SFC WIND (KTS)..NW 19G22 N 20G22 N 20G21 N 16G18
WAVE HEIGHT (FT)5 6 7 7
SST (C).........50F
SATURDAY
SKY/WEATHER.........PARTLY SUNNY (60-70 PERCENT).
CHANCE OF PCPN......10 PERCENT.
MAX TEMPERATURE.....AROUND 48.
MIN HUMIDITY........82 PERCENT.
SURFACE WINDS (KTS).NORTH WINDS 7 TO 14 KNOTS SHIFTING TO THE
NORTHWEST UP TO 5 KNOTS EARLY IN THE AFTERNOON,
THEN BECOMING LIGHT LATE IN THE AFTERNOON.
WAVE HEIGHT.........6 FEET.
SEA SURFACE TEMP....50F
TIME (AKDT) 6 AM 9 AM NOON 3 PM
SKY (%).........78 72 63 51
WEATHER COV.....
WEATHER TYPE....NONE NONE NONE NONE
CHC OF PCPN (%).0 0 0 10
TEMP............48 48 48 47
RH..............83 84 83 83
SFC WIND (KTS)..NW 14G17 N 14G16 N 9G11 NW 5G7
WAVE HEIGHT (FT)6 6 5 5
SST (C).........50F
FORECASTER...JONES
REQUESTED BY...AUSTIN GEARTY
TYPE OF REQUEST...MARINE
.TAG 2619984.0/ALU
.DELDT 08/20/26
.FORMATTERVERSION 2.0.0
.EMAIL XO.BELL.SHIMADA@NOAA.GOV,OPS.BELL.SHIMADA@NOAA.GOV,NAV.BELL.SHIMADA@NOAA.GOV,CO.BELL.SHIMADA@NOAA.GOV,RYAN.MCCABE@NOAA.GOV,AUSTIN.GEARTY@NOAA.GOV
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