FNUS73 KLSX 191043 FWSLSX Spot Forecast for West Tyson East Unit...St. Louis County Parks Forestry National Weather Service Saint Louis MO 543 AM CDT Thu Mar 19 2026 Forecast is based on ignition time of 0600 CDT on March 19. If conditions become unrepresentative, contact the National Weather Service. .DISCUSSION... High clouds over the burn site will gradually clear this morning, with mostly clear skies expected this afternoon, allowing for temperatures to quickly climb into the mid 70s. Winds will remain light through the day and generally out of the southwest, though they may become variable at times. .TODAY... Sky/weather.........Mostly sunny (40-50 percent) then becoming partly sunny (55-65 percent) then becoming sunny (10-20 percent). Temperature.........48 at ignition...Max 77. RH..................68 percent at ignition...Min 32 percent. Eye level winds.....Light winds. Adjustment factor of 0.4 used. Wind (20 ft)........Winds southwest at 3 mph at ignition...otherwise Light winds. Mixing height.......500 ft AGL at ignition...otherwise max 4200 ft AGL. Transport winds.....Southwest 6 to 9 mph shifting to the south around 8 mph late in the afternoon. Smoke dispersal.....Poor /660 m/s-m/ at ignition. Max...marginal /4650 m/s-m/. TIME (CDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM Sky (%).........45 76 70 65 54 48 13 28 19 8 4 1 Weather cov..... Weather type.... Tstm cov........ Temp............48 47 49 52 58 63 68 72 74 75 77 76 RH..............68 71 71 66 55 48 42 37 35 33 32 33 20 FT wind dir..SW SW SW SW SW SW SW S S S SW S 20 FT wind spd..3 2 2 2 3 3 3 4 4 4 4 3 20 FT wind gust.5 5 5 7 7 8 8 9 9 9 9 7 Eye lvl wnd dir.SW SW SW SW SW SW SW S S S SW S Eye lvl wnd spd.1 1 1 1 1 1 1 2 2 2 2 1 Eye lvl wnd gst.2 2 2 3 3 4 4 4 4 4 4 3 Mix hgt (kft)...0.5 0.5 0.5 0.6 0.8 1.3 1.8 2.6 3.7 4.2 4.2 3.7 Transp wind dir.W W W SW SW W SW SW SW SW SW S Transp wind spd.9 9 8 6 7 8 7 8 8 8 8 8 Vrate kt-ft/1K..4 4 4 3 5 9 11 18 26 30 30 26 Ventrate Cat....PR PR PR PR PR PR PR PR PR PR PR PR $$ Forecaster...Elmore Requested by...Jason Pratte Type of request...PRESCRIBED .TAG 2606481.0/LSX .DELDT 03/19/26 .FormatterVersion 2.0.0