849
FNUS73 KLSX 071133
FWSLSX

Spot Forecast for Prescribe Burn class...Missouri Department of Conservation
National Weather Service Saint Louis MO
533 AM CST Fri Nov 7 2025

Forecast is based on ignition time of 0600 CST on November 07.
If conditions become unrepresentative, contact the
National Weather Service.

.DISCUSSION...
A cold front is currently moving through the area and will pass
through the burn site by 9 AM. Dry air will move into the region
behind the front, allowing RH values to drop into the mid to upper
30s by this afternoon.

The atmosphere will mix above 1700 ft between 11am-12pm today, reaching
a maximum height between 5300-6800 ft. This section of the atmosphere
will be unstable, and will allow smoke to rise quickly. 20-25 mph winds
within the mixed layer will allow for effective smoke dispersion this
afternoon. Winds at the surface may gust briefly to 20 mph during the
afternoon, resulting in an eye level gust around 8 mph.

.TODAY...

Sky/weather.........Sunny (10-20 percent).
CWR.................0 percent.
Chance of thunder...0 percent.
Temperature.........61 at ignition...Max 70.
RH..................84 percent at ignition...Min 36 percent.
Eye level winds.....2-4 mph, using an adjustment factor of 0.4.
Wind (20 ft)........Winds west at 6 mph at ignition...otherwise
                    West winds 6 to 10 mph.
Mixing height.......600 ft AGL at ignition...otherwise max 5800 ft
                    AGL.
Transport winds.....Northwest 10 to 18 mph increasing to 12 to 21
                    mph in the afternoon.
Smoke dispersal.....Poor /860 m/s-m/ at ignition. Max...excellent
                    /16320 m/s-m/.

TIME (CST)      6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........25  16  10  5   4   1   4   3   3   3   2   2
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............61  60  60  62  63  66  68  70  70  69  68  64
RH..............84  84  84  70  62  52  44  39  38  36  37  43
20 FT wind dir..W   W   W   W   NW  NW  NW  NW  NW  NW  NW  W
20 FT wind spd..6   6   6   7   7   8   8   10  10  9   8   6
20 FT wind gust.13  14  14  13  13  13  14  15  16  16  14  11
Eye lvl wnd dir.W   W   W   W   NW  NW  NW  NW  NW  NW  NW  W
Eye lvl wnd spd.3   3   3   3   3   4   4   5   5   4   4   3
Eye lvl wnd gst.6   6   6   6   6   6   6   7   7   7   6   5
Mix hgt (kft)...0.6 0.5 0.8 1.3 1.7 2.5 4.2 5.8 5.7 5.7 1.8 0.9
Transp wind dir.W   W   W   NW  NW  NW  NW  NW  NW  W   W   W
Transp wind spd.12  10  12  12  12  13  18  21  21  17  12  12
Vrate kt-ft/1K..6   5   8   13  17  27  68  104 103 85  18  9
Ventrate Cat....PR  PR  PR  PR  PR  PR  GD  VGD VGD GD  PR  PR

.TONIGHT...

Sky/weather.........Mostly clear (10-20 percent) then becoming
                    mostly cloudy (50-60 percent).
CWR.................0 percent.
Chance of thunder...0 percent.
Temperature.........Min 42.
RH..................Max 93 percent.
Eye level winds.....2 mph, using an adjustment factor of 0.4.
Wind (20 ft)........West winds around 5 mph early in the evening
                    becoming light.
Mixing height.......Min 400 ft AGL.
Transport winds.....West 2 to 10 mph.
Smoke dispersal.....Poor (160 m/s-m).

$$
Forecaster...Delia
Requested by...Ryan Westcott
Type of request...PRESCRIBED
.TAG 2525202.0/LSX
.DELDT 11/07/25
.FormatterVersion 2.0.0