146
FNUS73 KLSX 210918
FWSLSX

Spot Forecast for Sherwood Prairie...MO DNR-State Parks
National Weather Service Saint Louis MO
318 AM CST Sun Dec 21 2025

Forecast is based on ignition time of 1000 CST on December 21.
If conditions become unrepresentative, contact the
National Weather Service.

.DISCUSSION...
Light southeasterly winds can be expected today, which may be
nearly calm for most of the morning. Minimum humidity will be
relatively low by mid afternoon, in spite of the cool
temperatures. The primary concern today may be ventilation, which
is likely to be poor thanks to the light winds and low inversion
heights. While ample sun will help with this slightly, maximum
inversion heights are not likely to reach much above 1300 feet,
and not until after noon.

Breezier southerly surface winds will develop tonight and continue
through the day tomorrow, which will help with ventilation
slightly, but inversion heights will remain shallow thanks to more
abundant cloud cover. Slightly warmer temperatures are also
expected during the day tomorrow, along with higher humidity.

.REST OF TODAY...

Sky/weather.........Sunny (15-25 percent).
CWR.................0 percent.
Temperature.........34 at ignition...Max 43.
RH..................64 percent at ignition...Min 41 percent.
Eye level winds.....Nearly calm winds becoming southeast 1 to 3 mph
                    early in the afternoon.
Wind (20 ft)........Nearly calm winds becoming southeast 3 to 6 mph
                    early in the afternoon.
Mixing height.......900 ft AGL at ignition...otherwise max 1300 ft
                    AGL.
Transport winds.....Southeast 7 to 9 mph.
Smoke dispersal.....Poor /1040 m/s-m/ at ignition. Max...poor /1650
                    m/s-m/.

TIME (CST)      10A 11A 12P 1PM 2PM 3PM 4PM 5PM 6PM 7PM 8PM 9PM
Sky (%).........33  17  6   6   6   12  21  18  22  3   10  13
Weather cov.....
Weather type....
Tstm cov........
CWR.............0   0   0   0   0   0   0   0   0   0   0   0
Temp............34  37  39  41  43  43  42  39  36  35  34  33
RH..............64  54  48  44  41  43  46  52  59  59  61  63
20 FT wind dir..E   E   SE  SE  SE  SE  SE  SE  SE  SE  SE  SE
20 FT wind spd..3   4   4   5   5   5   4   4   4   4   4   4
20 FT wind gust.7   8   9   9   9   10  9   9   9   10  11  11
Eye lvl wnd dir.E   E   SE  SE  SE  SE  SE  SE  SE  SE  SE  SE
Eye lvl wnd spd.1   2   2   2   2   2   2   2   2   2   2   2
Eye lvl wnd gst.3   4   4   4   4   5   4   4   4   5   5   5
Mix hgt (kft)...0.9 1.1 1.3 1.3 1.3 1.3 0.9 0.6 0.4 0.4 0.6 0.6
Transp wind dir.E   E   SE  SE  SE  SE  SE  SE  SE  SE  SE  SE
Transp wind spd.8   8   8   8   8   9   7   8   9   10  12  13
Vrate kt-ft/1K..7   8   9   9   9   11  6   4   3   4   6   7
Ventrate Cat....PR  PR  PR  PR  PR  PR  PR  PR  PR  PR  PR  PR

.TONIGHT...

Sky/weather.........Mostly clear (15-25 percent).
CWR.................0 percent.
Temperature.........Min 30.
RH..................Max 69 percent.
Eye level winds.....Southeast winds around 1 to 3 mph.
Wind (20 ft)........Southeast winds around 4 to 7 mph.
Mixing height.......Min 400 ft AGL.
Transport winds.....South 9 to 16 mph.
Smoke dispersal.....Poor (530 m/s-m).

.MONDAY...

Sky/weather.........Mostly sunny (40-50 percent) then becoming
                    mostly cloudy (70-80 percent).
CWR.................0 percent.
Temperature.........Max 53.
RH..................Min 57 percent.
Eye level winds.....South winds 2 to 4 mph Gusts to 8 mph.
Wind (20 ft)........South winds 5 to 9 mph Gusts to 15 mph.
Mixing height.......Max 1400 ft AGL.
Transport winds.....South 13 to 21 mph.
Smoke dispersal.....Poor (1180 m/s-m).

$$
Forecaster...19
Requested by...Franny Stockton
Type of request...PRESCRIBED
.TAG 2527986.0/LSX
.DELDT 12/21/25
.FormatterVersion 2.0.0