FNUS73 KLSX 201250 FWSLSX Spot Forecast for Posen woods Rx...IDNR National Weather Service Saint Louis MO 750 AM CDT Fri Mar 20 2026 Forecast is based on ignition time of 1000 CDT on March 20. If conditions become unrepresentative, contact the National Weather Service. .DISCUSSION... Warm, breezy, and dry conditions are expected today. Winds in the morning will be light, but will increase steadily near midday and continue through the afternoon. Warm temperatures and deep mixing are expected, although the inversion may not fully break until after noon due to the presence of high clouds. These temperatures and deep mixing will also lead to low humidity, and perhaps a few stronger gusts during the mid to 8late afternoon. Winds and humidity will need to be monitored closely, as this burn location is located in between areas that have both stronger winds and lower humidity forecast. A slight shift in the location of either could lead to slightly stronger wind gusts or lower humidity as a result. Late this evening, a weak cold front will sink into the area, causing winds to shift to the northeast but also become light. Good humidity recovery is expected overnight, then another warm day with slightly higher humidity and lower wind speeds can be expected tomorrow with lighter expected winds. .REST OF TODAY... Sky/weather.........Mostly sunny (20-30 percent). CWR.................1 percent. Temperature.........64 at ignition...Max 81. RH..................67 percent at ignition...Min 23 to 28 percent. Eye level winds.....Winds southwest at 1 to 3 mph at ignition...increasing to southwest 4 to 5 mph with gusts to 8 mph after noon. Wind (20 ft)........Winds southwest at 3 to 6 mph at ignition...increasing to southwest 8 to 10 mph with gusts to 15 mph after noon. Mixing height.......1000 ft AGL at ignition...otherwise max 5000 ft AGL. Transport winds.....West 12 to 21 mph. Smoke dispersal.....Poor /1600 m/s-m/ at ignition. Max...good /14250 m/s-m/. TIME (CDT) 10 AM NOON 2 PM 4 PM 6 PM 8 PM Sky (%).........25 31 29 27 25 37 Weather cov..... Weather type....NONE NONE NONE NONE NONE NONE Tstm cov........ CWR.............0 0 0 0 0 0 Temp............64 73 78 81 77 69 RH..............67 46 31 28 36 55 20 ft wind......SW 8 SW 10 W 10 W 10 W 5 W 5 20 ft wind gust.13 15 15 15 12 9 Eye level wind..SW 4 SW 5 W 5 W 5 W 2 W 2 Eye lvl wnd gst.6 7 7 7 6 4 Mix hgt (kft)...1.0 1.7 3.7 5.0 0.9 0.4 Transport wind..W 12 W 14 W 20 W 21 W 13 NW 10 Vrate kt-ft/1K..10 21 63 91 10 4 Ventrate Cat....POOR POOR GOOD GOOD POOR POOR .TONIGHT... Sky/weather.........Partly cloudy (30-40 percent) then becoming mostly cloudy (50-60 percent) then becoming mostly clear (15-25 percent). CWR.................1 percent. Temperature.........Min 50. RH..................Max 100 percent. Eye level winds.....West winds around 1 to 3 mph early in the evening becoming northeast 1 to 2 mph after 10 pm. Wind (20 ft)........West winds 3 to 6 mph mph early in the evening becoming northeast 1 to 3 mph after 10 pm. Mixing height.......Min 400 ft AGL. Transport winds.....West 12 to 13 mph shifting to the east 9 to 10 mph overnight. Smoke dispersal.....Poor (460 m/s-m). .SATURDAY... Sky/weather.........Sunny (10-20 percent). CWR.................1 percent. Temperature.........Max 77.RH..................Min 45 percent. Eye level winds.....Light and variable winds in the morning, gradually switching to south-southwest 2 to 3 mph by late afternoon. Wind direction will shift continuously throughout the day. Wind (20 ft)........Light and variable winds in the morning, gradually switching to south-southwest 4 to 7 mph by late afternoon. Wind direction will shift continuously throughout the day. Mixing height.......Max 3000 ft AGL. Transport winds.....East 6 to 10 mph shifting to the west 5 to 7 mph in the afternoon. Smoke dispersal.....Poor (520 m/s-m). $$ Forecaster...19 Requested by...Blake Baum Type of request...PRESCRIBED .TAG 2606758.0/LSX .DELDT 03/20/26 .FormatterVersion 2.0.0