188
FNUS73 KBIS 292210
FWSBIS

Spot Forecast for SW Williams Co. Fire...Williams County Emergency Management
National Weather Service Bismarck ND
510 PM CDT Mon Sep 29 2025

Forecast is based on forecast start time of 1700 CDT on September 29.
If conditions become unrepresentative, contact the National Weather
Service.

.DISCUSSION...

Winds are forecast to remain out of the east around 10 to 15 mph
through tonight, with gusts as high as 25 mph possible through the
early evening. Relative humidity should recover to around 75 to 80
percent overnight. On Tuesday, winds are expected to turn to the
southeast around 10 to 15 mph in the morning, then become south-
southeast around 15 mph with gusts to 25 mph in the afternoon.
Relative humidity is forecast to fall to around 30 percent Tuesday
afternoon, under a mostly sunny sky with a high temperature in the
mid to upper 80s.

.REST OF TODAY...

Sky/weather.........Mostly sunny.
CWR.................0 percent.
Chance of pcpn......0 percent.
Chance of thunder...0 percent.
Max temperature.....Around 78.
Min humidity........43 percent.
Wind (20 ft)........East winds around 15 mph.
Mixing height.......2700 ft AGL.
Transport winds.....East around 18 mph.
Smoke dispersal.....Fair (42400 knot-ft).

TIME (CDT)      5PM
Sky (%).........7
Weather cov.....
Weather type....
Tstm cov........
CWR.............0
Chc of pcpn (%).0
Chc of thdr (%).0
Temp............77
RH..............45
20 FT wind dir..E
20 FT wind spd..14
20 FT wind gust.23
Mix hgt (kft)...2.7
Transp wind dir.E
Transp wind spd.18
Dispr kt-ft/1K..42

.TONIGHT...

Sky/weather.........Partly cloudy.
CWR.................0 percent.
Chance of pcpn......0 percent.
Chance of thunder...0 percent.
Min temperature.....Around 58.
Max humidity........78 percent.
Wind (20 ft)........East winds around 10 to 15 mph.
Mixing height.......300 ft AGL.
Transport winds.....East around 13 to 18 mph.
Smoke dispersal.....Fair (42800 knot-ft) early in the evening
                    decreasing to poor (3200 knot-ft) at night.

TIME (CDT)      6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........8   19  27  26  37  54  48  48  41  43  42  39
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
Chc of thdr (%).0   0   0   0   0   0   0   0   0   0   0   0
Temp............77  75  72  68  67  66  65  64  63  62  62  61
RH..............47  54  59  63  65  68  73  75  78  78  75  78
20 FT wind dir..E   E   E   E   E   E   E   E   E   E   E   E
20 FT wind spd..13  11  12  14  13  13  12  12  12  12  11  11
20 FT wind gust.18  15  17  20  20  20  20  18  17  17  17  17
Mix hgt (kft)...2.7 1.1 0.4 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3
Transp wind dir.E   E   E   E   E   E   E   E   E   E   E   E
Transp wind spd.18  16  16  16  15  15  15  14  14  14  13  13
Dispr kt-ft/1K..43  16  6   4   4   4   4   4   4   3   3   3

.TUESDAY...

Sky/weather.........Mostly sunny.
CWR.................0 percent.
Chance of pcpn......0 percent.
Chance of thunder...0 percent.
Max temperature.....Around 87.
Min humidity........29 percent.
Wind (20 ft)........Southeast winds around 10 to 15 mph in the
                    morning, shifting to the south-southeast
                    around 15 mph with gusts up to 25 mph in the
                    afternoon.
Mixing height.......6900 ft AGL.
Transport winds.....Southeast around 15 mph in the morning,
                    shifting to the south around 20 to 25 mph in
                    the afternoon.
Smoke dispersal.....Poor (3200 knot-ft) early in the morning
                    increasing to very good (119100 knot-ft) in
                    the afternoon.

TIME (CDT)      6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........27  35  34  30  8   6   6   5   10  10  10  10
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
Chc of thdr (%).0   0   0   0   0   0   0   0   0   0   0   0
Temp............61  60  60  62  66  72  76  80  83  85  87  86
RH..............75  78  78  75  68  55  48  41  36  32  29  30
20 FT wind dir..E   SE  SE  SE  SE  SE  SE  SE  SE  S   S   S
20 FT wind spd..11  11  12  12  12  13  14  15  16  16  16  15
20 FT wind gust.17  17  17  18  19  20  21  22  24  25  25  24
Mix hgt (kft)...0.3 0.3 0.3 0.4 1.0 1.4 1.7 2.3 3.1 4.2 6.0 6.9
Transp wind dir.SE  E   SE  SE  SE  SE  S   S   S   S   S   S
Transp wind spd.13  13  14  14  17  17  18  21  21  22  23  22
Dispr kt-ft/1K..3   3   3   4   15  21  28  42  57  79  119 130

$$
Forecaster...HOLLAN
Requested by...Mike Smith
Type of request...WILDFIRE
.TAG 2522735.0/BIS
.DELDT 09/29/25
.FormatterVersion 2.0.0
.EMAIL mikesm@co.williams.nd.us