264
FNUS73 KBIS 201956
FWSBIS

Spot Forecast for HB-10...US FWS
National Weather Service Bismarck ND
256 PM CDT Mon May 20 2024

Forecast is based on ignition time of 1437 CDT on May 20.
If conditions become unrepresentative, contact the National Weather
Service.

.DISCUSSION...

Winds this afternoon will gust up to 20 mph out of the west northwest
before settling down this evening and becoming light and variable
overnight through Tuesday morning. Dry conditions are expected today,
although diurnal cumulus has developed resulting in mostly cloudy skies.
These clouds will rapidly dissipate this evening as the sun begins to
set resulting in partly cloudy skies. Minimum relative humidity values
are expected to drop down to 32 percent this afternoon.

.REST OF TODAY...

Sky/weather.........Mostly cloudy.
CWR.................0 percent.
Chance of pcpn......0 percent.
LAL.................1.
Max temperature.....Around 65.
Min humidity........32 percent.
Wind (20 ft)........Northwest winds around 10 mph with gusts to
                    around 20 mph.
Mixing height.......8100 ft AGL.
Transport winds.....West 17 to 22 mph.
Smoke dispersal.....Very good (117600 knot-ft).
Haines Index........4 to 5 or low to moderate potential for large
                    plume dominated fire growth.

TIME (CDT)      2PM 3PM 4PM 5PM
Sky (%).........75  80  80  75
Weather cov.....
Weather type....
Tstm cov........
CWR.............0   0   0   0
Chc of pcpn (%).0   0   0   0
LAL.............1   1   1   1
Temp............61  62  63  63
RH..............44  41  38  37
20 FT wind dir..NW  NW  NW  NW
20 FT wind spd..10  10  9   9
20 FT wind gust.20  19  19  17
Mix hgt (kft)...6.2 7.2 7.7 8.1
Transp wind dir.W   W   W   W
Transp wind spd.22  22  18  17
Haines index....4   4   5   5
Dispr kt-ft/1K..118 137 124 122

.TONIGHT...

Sky/weather.........Partly cloudy.
CWR.................0 percent.
Chance of pcpn......0 percent.
LAL.................1.
Min temperature.....Around 41.
Max humidity........89 percent.
Wind (20 ft)........Northwest winds 5 to 10 mph becoming light and
variable.
Mixing height.......400 ft AGL.
Transport winds.....West 8 to 15 mph shifting to the southwest 5 to
                    6 mph.
Smoke dispersal.....Very good (103100 knot-ft) early in the evening
                    decreasing to poor (4600 knot-ft) late in the
                    evening.
Haines Index........5 or moderate potential for large plume
                    dominated fire growth.

TIME (CDT)      6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........70  55  25  25  31  48  43  28  29  21  25  23
Weather cov.....
Weather type....
Tstm cov........
CWR.............0   0   0   0   0   0   0   0   0   0   0   0
Chc of pcpn (%).0   0   0   0   0   0   0   0   0   0   0   0
LAL.............1   1   1   1   1   1   1   1   1   1   1   1
Temp............63  62  60  57  52  50  48  47  45  44  43  43
RH..............36  36  42  51  61  68  77  76  82  82  89  86
20 FT wind dir..NW  NW  W   NW  NW  NW  W   NW  W   W   SW  W
20 FT wind spd..9   8   6   5   4   4   3   3   3   3   3   3
20 FT wind gust.14  13  11  9   8   7   6   6   6   6   6   6
Mix hgt (kft)...7.9 7.6 5.5 0.7 0.9 0.9 0.4 0.4 0.4 0.4 0.4 0.4
Transp wind dir.W   W   W   W   NW  N   N   NW  SW  W   SW  W
Transp wind spd.15  13  10  8   8   8   7   7   6   6   5   6
Haines index....5   5   5   5   5   5   5   5   5   5   5   5
Dispr kt-ft/1K..103 84  49  5   6   7   2   2   2   2   2   2

.TUESDAY...

Sky/weather.........Mostly sunny. Slight chance of rain showers
                    late in the afternoon.
CWR.................0 percent.
Chance of pcpn......20 percent.
LAL.................1.
Max temperature.....Around 66.
Min humidity........40 percent.
Wind (20 ft)........Light winds becoming northwest around 11 mph.
Mixing height.......7900 ft AGL.
Transport winds.....West 5 to 6 mph increasing to 12 to 15 mph.
Smoke dispersal.....Poor (1900 knot-ft) early in the morning
                    increasing to good (79000 knot-ft) in the
                    afternoon.
Haines Index........5 or moderate potential for large plume
                    dominated fire growth.

TIME (CDT)      6 AM      9 AM      NOON      3 PM
Sky (%).........30        32        36        60
Weather cov.....
Weather type....NONE      NONE      NONE      NONE
Tstm cov........
CWR.............0         0         0         0
Chc of pcpn (%).0         0         0         10
LAL.............1         1         1         1
Temp............42        53        61        64
RH..............89        69        46        40
20 FT wind......W 4G6     W 5G9     SW 8G12   W 10G15
Mix hgt (ft)....400       900       7000      7800
Transport wind..W 6       S 6       SW 9      W 12
Haines index....5         5         5         5
Dispr kt-ft/1K..2         4         56        78

$$
Forecaster...TELKEN
Requested by...Jeff Dion
Type of request...PRESCRIBED
.TAG 2414749.0/BIS
.DELDT 05/20/24
.FormatterVersion 2.0.0
.EMAIL calvin_moldenhauer@fws.gov