531
FNUS73 KLOT 121252
FWSLOT

Spot Forecast for Chicago Road Seedbeds...USFS
National Weather Service Chicago IL
752 AM CDT Wed Mar 12 2025

Forecast is based on ignition time of 0600 CDT on March 12.
If conditions become unrepresentative, contact the National Weather
Service.

Please contact our office at (815) 834-0666 if you have questions
or concerns with this forecast.

.DISCUSSION...
This is an update to the original SPOT forecast to update short
term relative humidities.

East to northeasterly 20-foot winds will be around 10 mph this
morning, perhaps with a few gusts to 15 mph before easing and
becoming northeast to northerly this afternoon. RH values will
fall into the low 30 percent range this afternoon. A lake breeze
may approach the burn site towards 6 to 8 PM. Warmer conditions
are expected on Thursday.


.REST OF TODAY...

Sky/weather.........Sunny.
Temperature.........Max 62.
RH..................Min 34 percent.
Wind (20 ft)........Winds east at 7 mph at ignition...otherwise
                    East winds 5 to 7 mph.
Chance of pcpn......0 percent.
Transport winds.....East 12 to 15 mph becoming northeast 5 to 8 mph
                    late in the morning.
Mixing height.......600 ft AGL at ignition...otherwise 2400 ft AGL.
Smoke dispersal.....Poor /7400 knot-ft/ at ignition. Max...poor
                    /12200 knot-ft/.

TIME (CDT)      8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........2   1   2   3   4   6   7   6   10  17
Weather cov.....
Weather type....
Temp............38  40  42  47  51  54  58  60  61  60
RH..............43  44  46  44  41  40  36  34  34  35
20 FT wind dir..100 110 110 090 080 070 060 060 060 050
20 FT wind spd..7   8   8   7   6   6   5   5   5   5
20 FT wind gust.9   12  12  8   7       6       6   6
Mix hgt (kft)...0.6 0.9 1.1 1.4 1.5 1.7 2.0 2.1 2.4 2.4
Transp wind dir.100 110 110 090 080 070 060 060 060 050
Transp wind spd.15  14  12  8   7   5   5   6   6   6
Chc of pcpn (%).0   0   0   0   0   0   0   0   0   0
Vrate kt-ft/1K..7   11  11  10  9   7   8   10  12  12

.TONIGHT...

Sky/weather.........Mostly clear.
Temperature.........Min 35.
RH..................Max 86 percent.
Wind (20 ft)........Northeast winds 5 to 6 mph in the evening
                    becoming light.
Chance of pcpn......0 percent.
Transport winds.....Northeast 9 to 12 mph.
Mixing height.......300 ft AGL.
Smoke dispersal.....Poor (2800 knot-ft).

TIME (CDT)      6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........20  23  26  33  36  33  27  18  13  12  10  8
Weather cov.....
Weather type....
Temp............57  51  48  44  42  40  39  38  37  36  36  35
RH..............40  47  54  63  70  75  77  79  81  84  85  86
20 FT wind dir..050 050 050 050 060 060 070 070 070 070 070 070
20 FT wind spd..6   6   6   6   6   5   5   3   3   3   3   3
20 FT wind gust.    7   7   7       6       5
Mix hgt (kft)...1.4 0.4 0.4 0.4 0.3 0.4 0.4 0.3 0.3 0.3 0.3 0.3
Transp wind dir.050 050 050 050 060 060 070 070 070 070 070 070
Transp wind spd.9   10  10  10  10  12  10  10  10  10  12  10
Chc of pcpn (%).0   0   0   0   0   0   0   0   0   0   0   0
Vrate kt-ft/1K..11  3   3   3   3   3   3   3   3   3   3   3

.THURSDAY...

Sky/weather.........Sunny.
Temperature.........Max 68.
RH..................Min 35 percent.
Wind (20 ft)........Light winds becoming east 6 to 8 mph early in
                    the morning.
Chance of pcpn......0 percent.
Transport winds.....East 9 to 13 mph.
Mixing height.......2600 ft AGL.
Smoke dispersal.....Poor (2700 knot-ft) early in the morning
                    increasing to fair (25700 knot-ft) in the
                    afternoon.

TIME (CDT)      6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........8   8   7   5   3   2   3   3   4   6   7   12
Weather cov.....
Weather type....
Temp............35  35  39  42  48  54  58  61  64  66  67  66
RH..............85  86  76  68  60  52  46  41  38  36  35  36
20 FT wind dir..070 070 070 070 070 080 090 090 090 100 100 100
20 FT wind spd..3   3   6   7   7   8   8   9   9   9   9   9
20 FT wind gust.    5               10  13  14  14  14  14  14
Mix hgt (kft)...0.3 0.3 0.3 0.4 0.6 1.3 1.6 2.1 2.2 2.4 2.6 1.9
Transp wind dir.070 070 070 070 070 080 090 090 090 100 100 100
Transp wind spd.10  10  12  9   10  13  13  13  12  12  12  12
Chc of pcpn (%).0   0   0   0   0   0   0   0   0   0   0   0
Vrate kt-ft/1K..3   3   3   3   6   14  18  23  22  24  26  18

$$
Forecaster...Carlaw
Requested by...Evan OConnor
Type of request...PRESCRIBED
.TAG 2505987.0/LOT
.DELDT 03/11/25
.FormatterVersion 2.0.0