Suppression Forecast
Issued by NWS Juneau, AK

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Spot Forecast for Cat Island...USFS Juneau
National Weather Service Juneau AK
700 PM AKDT Thu Jul 29 2021

Forecast is based on forecast start time of 1900 AKDT on July 29.
If conditions become unrepresentative...contact the National Weather
Service.

Please contact our office at (907) 790-6824, if you have questions
or concerns with this forecast.

.DISCUSSION...Low pressure over Hecate Strait shifts E into
Canada Fri but returns to the central Panhandle Fri night. A ridge
of high pressure the northern gulf retreats SW Fri night. A low
then approaches the central gulf over the weekend.
Clearing skies into the weekend. Any isolated rain showers for
Friday and the weekend expected to be mainly to the west and east
of Prince of Wales Island. Slight chance of thunderstorms Friday
and Saturday afternoon and evening, with better chance on
Saturday. Precip amounts, if any, will be less than 0.10 inches.
Temperatures will be in the mid 70s through the weekend. Minimum
relative humidity expected to be about 40% and rebounding to
80-90% overnight. Winds generally light northerly with sea breezes
in the afternoon.


.TONIGHT...

Sky/weather.........Mostly cloudy (65-75 percent).
CWR.................0 percent.
LAL.................No Tstms.
Min temperature.....Around 55.
Max humidity........100 percent.
Wind (20 ft)........
 Slope/valley.......Light winds.
Mixing height.......4900 ft AGL decreasing to 200-300 ft AGL in the
                    late evening and overnight.
Transport winds.....Southeast around 3 mph shifting to the north 0
                    to 1 mph in the late evening and overnight.
Haines Index........3 very low potential for large plume dominated
                    fire growth.
Rainfall amount.....0.00 inches.

TIME (AKDT)      7 PM      10 PM     1 AM      4 AM
Sky (%).........70        66        65        63
Weather cov.....
Weather type....NONE      NONE      NONE      NONE
Tstm cov........
CWR.............0         0         0         0
LAL.............1         1         1         1
Temp............66        63        58        55
RH..............69        79        91        99
20 FT wind......E 2G6     NE 1G2    NE 1G2    NE 2G5
Mix hgt (ft)....4900      200       200       300
Transport wind..SE 3      NE 0      NE 0      N 1
Haines index....3         3         3         3

.FRIDAY...

Sky/weather.........Partly sunny (55-65 percent).
CWR.................0 percent.
LAL.................No Tstms.
Max temperature.....Around 74.
Min humidity........56 percent.
Wind (20 ft)........
 Slope/valley.......Light winds becoming southwest 5 to 6 mph in
                    the afternoon.
Mixing height.......300 ft AGL increasing to 2200-3000 ft AGL in
                    the late morning and afternoon.
Transport winds.....Northeast around 1 mph shifting to the
                    southeast 2 to 7 mph in the late morning and
                    afternoon.
Haines Index........3 very low potential for large plume dominated
                    fire growth.
Rainfall amount.....0.00 inches.

TIME (AKDT)      6 AM      9 AM      NOON      3 PM
Sky (%).........63        51        49        69
Weather cov.....
Weather type....NONE      NONE      NONE      NONE
Tstm cov........
CWR.............0         0         0         0
LAL.............1         1         1         1
Temp............55        60        69        74
RH..............100       90        72        58
20 FT wind......NE 2G5    NE 1G2    S 0G5     SW 5G10
Mix hgt (ft)....300       300       3000      3000
Transport wind..N 1       NE 1      E 2       SE 7
Haines index....3         3         3         3

.FRIDAY NIGHT...

Sky/weather.........Mostly cloudy (50-60 percent) then becoming
                    mostly clear (15-25 percent).
CWR.................0 percent.
LAL.................No Tstms.
Min temperature.....Around 57.
Max humidity........94 percent.
Wind (20 ft)........
 Slope/valley.......West winds around 6 mph early in the evening
                    becoming light.
Mixing height.......300-2200 ft AGL.
Transport winds.....Southeast around 2 mph shifting to the
                    northwest around 1 mph in the evening, then
                    shifting to the southeast after midnight.
Haines Index........3 to 4 OR very low potential for large plume
                    dominated fire growth to low potential for
                    large plume dominated fire growth.
Rainfall amount.....0.00 inches.

TIME (AKDT)      6 PM      9 PM      MIDNGT    3 AM
Sky (%).........54        17        17        20
Weather cov.....
Weather type....NONE      NONE      NONE      NONE
Tstm cov........
CWR.............0         0         0         0
LAL.............1         1         1         1
Temp............73        68        63        58
RH..............57        66        79        91
20 FT wind......SW 6G11   W 6G12    NW 4G8    SW 4G8
Mix hgt (ft)....2200      2200      300       300
Transport wind..SE 2      W 1       NW 1      S 1
Haines index....3         3         4         4

.SATURDAY...

Sky/weather.........Sunny (20-30 percent). Isolated rain showers in
                    the afternoon. Slight chance of thunderstorms
                    late in the afternoon.
CWR.................0 percent.
LAL.................No Tstms until 1600, then 1-8 strikes.
Max temperature.....Around 68.
Min humidity........51 percent.
Wind (20 ft)........
 Slope/valley.......Light winds becoming southwest 5 to 6 mph in
                    the afternoon. Gusty and erratic winds expected
                    near thunderstorms late in the afternoon.
Mixing height.......300 ft AGL increasing to 2400 ft AGL in the
                    late morning and early afternoon, then
                    decreasing to 300 ft AGL late in the afternoon.
Transport winds.....South 1 to 5 mph shifting to the southwest
                    around 2 mph late in the afternoon.
Haines Index........3 to 4 OR very low potential for large plume
                    dominated fire growth to low potential for
                    large plume dominated fire growth.
Rainfall amount.....0.00 inches.

TIME (AKDT)      6 AM      9 AM      NOON      3 PM
Sky (%).........19        22        23        21
Weather cov.....                              ISOLTD
Weather type....NONE      NONE      NONE      RNSHWR
Tstm cov........
CWR.............0         0         0         0
LAL.............1         1         1         1
Temp............57        60        65        68
RH..............94        84        66        53
20 FT wind......SE 3G7    S 3G6     S 4G7     S 5G10
Mix hgt (ft)....300       300       2400      2400
Transport wind..SE 1      S 2       S 3       S 5
Haines index....3         3         4         4

.FORECAST DAYS 3 THROUGH 5...
.SUNDAY...
Partly cloudy. Slight chance of thunderstorms and isolated
showers. Lows in the lower 50s. Highs in the upper 60s. Light
winds.
.MONDAY...
Mostly cloudy with chance of rain. Lows in the lower 50s. Highs
in the mid 60s. West winds around 6 mph.
.TUESDAY...
Cloudy with chance of rain. Lows in the lower 50s. Highs in the
lower 60s. Southwest winds around 5 mph.

$$
Forecaster...Boyd
Requested by...Daniel McMaster
Type of request...WILDFIRE
.TAG 2116626.0/AJK
.DELDT 07/29/21
.EMAIL daniel.mcmaster@usda.gov


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