Spot Forecast Issued by NWS St. Louis, MO
000
FNUS73 KLSX 271110
FWSLSX
Spot Forecast for Twelve Mile Prescribed Burn...Illinois DNR
National Weather Service Saint Louis MO
610 AM CDT Wed Mar 27 2024
Forecast is based on ignition time of 0700 CDT on March 27.
If conditions become unrepresentative, contact the
National Weather Service.
.DISCUSSION...
Clouds are expected to linger through early this morning period
before clearing takes place between late morning and early afternoon.
Once cloud cover clears, surface temperatures will warm and humidity
will drop. Westerly winds are expected to be light through the day
today. Temperatures will fall near or just below freezing tonight,
then southwest winds will warm temperatures another 10-15 degrees
Thursday. Warmer conditions will extend through the weekend with
highs making it into the 70s.
.REST OF TODAY...
Sky/weather.........Mostly cloudy (75-85 percent) then becoming
mostly sunny (20-30 percent).
Temperature.........36 at ignition...Max 49.
RH..................72 percent at ignition...Min 44 percent.
Wind (20 ft)........Winds northwest at 7 mph at
ignition...otherwise Northwest winds 6 to 9
mph.
Eye level winds.....Northwest wind 3-4 mph. Adjustment factor 0.4.
Mixing height.......1900 ft AGL at ignition...otherwise max 4200 ft
AGL.
Transport winds.....Northwest 10 to 16 mph.
Smoke dispersal.....Poor /3650 m/s-m/ at ignition. Max...good /7900
m/s-m/.
TIME (CDT) 7 AM 9 AM 11 AM 1 PM 3 PM 5 PM
Sky (%).........88 73 73 26 14 3
Weather cov.....
Weather type....NONE NONE NONE NONE NONE NONE
Tstm cov........
Temp............36 36 38 43 47 49
RH..............72 72 64 55 47 44
20 ft wind......NW 7 NW 8 NW 7 W 7 W 8 W 8
20 ft wind gust.12 13 12 10 12 12
Eye level wind..NW 3 NW 4 NW 3 W 3 W 4 W 4
Eye lvl wnd gst.6 6 6 5 6 6
Mix hgt (kft)...1.9 2.6 3.0 3.4 4.0 3.9
Transport wind..NW 14 NW 15 NW 12 W 12 W 13 W 14
Vrate kt-ft/1K..23 34 30 34 44 47
Ventrate Cat....POOR POOR POOR POOR FAIR FAIR
.TONIGHT...
Sky/weather.........Clear (0-10 percent).
Temperature.........Min 31.
RH..................Max 85 percent.
Wind (20 ft)........West winds 5 to 7 mph early in the evening
becoming light.
Eye level winds.....West winds 2-3 mph becoming light. Adjustment
factor 0.4.
Mixing height.......Min 300 ft AGL.
Transport winds.....Northwest 7 to 12 mph.
Smoke dispersal.....Marginal (5070 m/s-m) early in the evening
decreasing to poor min (310 m/s-m) late in the
night.
.THURSDAY...
Sky/weather.........Sunny (0-10 percent).
Temperature.........Max 61.
RH..................Min 32 percent.
Wind (20 ft)........Light winds becoming southwest 5 to 10 mph in
the late morning and afternoon.
Eye level winds.....Light winds becoming southwest at 2-4 mph.
Adjustment factor 0.4.
Mixing height.......Max 5500 ft AGL.
Transport winds.....Southwest 6 to 14 mph shifting to the west 15
to 20 mph in the afternoon.
Smoke dispersal.....Poor (240 m/s-m) early in the morning
increasing to good max (14170 m/s-m) in the
afternoon.
$$
Forecaster...Maples
Requested by...Wade Ulrey
Type of request...PRESCRIBED
.TAG 2408536.0/LSX
.DELDT 03/27/24
.FormatterVersion 2.0.0