127
FNUS73 KLSX 031925
FWSLSX

Spot Forecast for Coffeen SFWA UMA...Illinois DNR
National Weather Service Saint Louis MO
125 PM CST Mon Nov 3 2025

Forecast is based on ignition time of 1000 CST on November 04.
If conditions become unrepresentative, contact the
National Weather Service.

.DISCUSSION...
A warm front will lift northward over the site tonight and early
Tuesday morning, with winds being southerly by ignition. These
southerly winds will boost temperatures through the day, with
values topping out unseasonably warm around 70 degrees. This
warmth will help lower RH, with values bottoming out around 40%
during the afternoon. If temperatures climb a degree or two warmer
than expected, RH may drop to around 35%. Winds will be strongest
during the afternoon when mixing is deepest. Mixing height at
ignition will be right around 1,000-1,300ft, and top out around 2,300ft.
Winds will decrease at sunset and become increasingly
southwesterly during the evening as high clouds increase in
coverage over the site.

.TUESDAY...

Sky/weather.........Sunny (15-25 percent).
CWR.................0 percent.
Chance of thunder...1 percent.
Temperature.........57 at ignition...Max 68.
RH..................54 percent at ignition...Min 44 percent.
Eye level winds.....Winds south at 5 mph with gusts to around 10 mph.
Adjustment factor of 0.4 used.
Wind (20 ft)........Winds south at 11 mph at ignition...otherwise
                    South winds 11 to 14 mph with gusts to around
                    22 mph.
Mixing height.......1300 ft AGL at ignition...otherwise max 2500 ft
                    AGL.
Transport winds.....South 20 to 24 mph.
Smoke dispersal.....Poor /3500 m/s-m/ at ignition. Max...good /8310
                    m/s-m/.

TIME (CST)      10A 11A 12P 1PM 2PM 3PM 4PM 5PM 6PM 7PM 8PM 9PM
Sky (%).........37  26  18  10  10  11  8   4   8   35  40  47
Weather cov.....
Weather type....
Tstm cov........
CWR.............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............57  62  64  66  67  68  66  63  61  56  56  55
RH..............54  50  49  46  45  44  46  49  63  74  74  77
20 FT wind dir..S   S   S   S   S   S   S   S   S   S   S   S
20 FT wind spd..11  12  14  14  14  14  13  12  12  13  14  13
20 FT wind gust.18  20  20  20  20  21  22  21  21  23  23  23
Eye lvl wnd dir.S   S   S   S   S   S   S   S   S   S   S   S
Eye lvl wnd spd.5   6   6   6   6   6   6   6   6   6   6   6
Eye lvl wnd gst.8   9   9   9   9   10  10  10  10  10  10  10
Mix hgt (kft)...1.3 1.8 2.3 2.4 2.4 2.5 1.9 1.2 0.6 0.5 0.5 0.5
Transp wind dir.S   S   S   S   S   S   S   S   S   S   SW  SW
Transp wind spd.20  21  21  22  23  24  23  21  20  20  21  21
Vrate kt-ft/1K..22  32  41  45  50  53  37  22  9   9   9   9
Ventrate Cat....PR  PR  FR  FR  FR  FR  PR  PR  PR  PR  PR  PR

.TUESDAY NIGHT...

Sky/weather.........Partly cloudy (25-35 percent) then becoming
                    mostly cloudy (45-55 percent) then becoming
                    partly cloudy (25-35 percent).
CWR.................0 percent.
Chance of thunder...0 percent.
Temperature.........Min 49.
RH..................Max 86 percent.
Eye level winds.....Southwest winds 5 mph. Gusts up to 12 mph.
Adjustment factor of 0.4 used.
Wind (20 ft)........Southwest winds 8 to 14 mph. Gusts up to
26 mph in the evening.
Mixing height.......Min 500 ft AGL.
Transport winds.....Southwest 17 to 21 mph.
Smoke dispersal.....Poor (1070 m/s-m).

$$
Forecaster...Elmore
Requested by...Emma Launer
Type of request...PRESCRIBED
.TAG 2524986.0/LSX
.DELDT 11/03/25
.FormatterVersion 2.0.0