520 FNUS73 KLSX 301016 FWSLSX Spot Forecast for Mountain Ridge Burn Unit...MO DNR National Weather Service Saint Louis MO 416 AM CST Tue Dec 30 2025 Forecast is based on ignition time of 0800 CST on December 30. If conditions become unrepresentative, contact the National Weather Service. .DISCUSSION... Initially westerly winds will become southwesterly by 3-4 PM, though speeds will be less than 10 mph and gust up to 20mph at times. Temperatures will warm compared to yesterday, starting at 27 around ignition time (11 AM) and increasing to 36 by 3 PM. Warming temperatures within the current dry air will result in minimum RH values this afternoon (2-4 pm) near 36%. There is only a 10% chance that RH values will drop below 30% this afternoon. Mixing will be slow to develop, mixing to 1500-1600 ft between 11am and 1 pm. Wind within this mixed layer will peak between 12-17mph, allowing for some smoke dispersion. .REST OF TODAY... Sky/weather.........Mostly sunny (30-40 percent) then becoming partly sunny (60-70 percent). CWR.................0 percent. Temperature.........18 at ignition...Max 37. RH..................77 percent at ignition...Min 38 percent. Eye level winds.....1-3 mph using an adjustment factor of 0.3. Wind (20 ft)........Winds west at 5 mph at ignition...otherwise West winds 5 to 8 mph. Mixing height.......1400 ft AGL at ignition...otherwise max 2300 ft AGL. Transport winds.....West 12 to 17 mph. Smoke dispersal.....Poor /2260 m/s-m/ at ignition. Max...marginal /5440 m/s-m/. TIME (CST) 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM 6PM 7PM Sky (%).........2 2 16 37 50 61 68 71 67 59 53 38 Weather cov..... Weather type.... Tstm cov........ CWR.............0 0 0 0 0 0 0 0 0 0 0 0 Temp............18 21 24 28 31 33 36 36 37 35 34 33 RH..............77 71 62 53 47 43 40 38 38 41 45 47 20 FT wind dir..W W W W W W W W W SW SW SW 20 FT wind spd..5 6 6 6 6 7 7 8 6 6 5 6 20 FT wind gust.11 11 11 11 12 13 13 14 12 11 11 12 Eye lvl wnd dir.W W W W W W W W W SW SW SW Eye lvl wnd spd.2 3 3 3 3 3 3 4 3 3 2 3 Eye lvl wnd gst.5 5 5 5 6 6 6 6 6 5 5 6 Mix hgt (kft)...1.4 1.7 1.8 1.9 2.0 2.2 2.3 2.3 1.8 1.1 0.8 0.8 Transp wind dir.W W W W W W W W W W W W Transp wind spd.12 12 12 12 13 14 15 17 17 12 13 14 Vrate kt-ft/1K..14 17 18 19 23 26 29 35 27 11 9 9 Ventrate Cat....PR PR PR PR PR PR PR PR PR PR PR PR .TONIGHT... Sky/weather.........Mostly cloudy (50-60 percent) then becoming mostly clear (15-25 percent). CWR.................0 percent. Temperature.........Min 27. RH..................Max 92 percent. Eye level winds.....1-3 mph, using an adjustment factor of 0.3. Wind (20 ft)........West winds 5 to 8 mph. Mixing height.......Min 700 ft AGL. Transport winds.....West 13 to 16 mph. Smoke dispersal.....Poor (1270 m/s-m). .WEDNESDAY... Sky/weather.........Partly sunny (50-60 percent). CWR.................0 percent. Temperature.........Max 45. RH..................Min 62 percent. Eye level winds.....1-2 mph, using an adjustment factor of 0.3. Wind (20 ft)........Light winds becoming west 5 to 6 mph in the late morning and afternoon, then becoming light late in the afternoon. Mixing height.......Max 2900 ft AGL. Transport winds.....West 12 to 18 mph. Smoke dispersal.....Poor (1070 m/s-m) early in the morning increasing to fair max (7100 m/s-m) in the afternoon. $$ Forecaster...Delia Requested by...Erik Otto Type of request...PRESCRIBED .TAG 2528129.0/LSX .DELDT 12/30/25 .FormatterVersion 2.0.0