923 FNUS73 KLSX 301013 FWSLSX Spot Forecast for Meramec Overlook...Missouri Department of Conservation National Weather Service Saint Louis MO 413 AM CST Tue Dec 30 2025 Forecast is based on ignition time of 1100 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. The westerly winds will be able to flow effectively up the topography. Temperatures will warm compared to yesterday, starting at 28 around ignition time (11 AM) and increasing to 37 by 3 PM. Warming temperatures within the current dry air will result in minimum RH values this afternoon (2-4 pm) near 35%. There is only a 20% 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 (40-50 percent). CWR.................0 percent. Chance of thunder...0 percent. Temperature.........28 at ignition...Max 37. RH..................50 percent at ignition...Min 35 percent. Eye level winds.....2-3 mph using an adjustment factor of 0.3. Wind (20 ft)........Winds west at 6 mph at ignition...otherwise West winds 6 to 8 mph. Mixing height.......1800 ft AGL at ignition...otherwise max 2300 ft AGL. Transport winds.....West 12 to 17 mph. Smoke dispersal.....Poor /2890 m/s-m/ at ignition. Max...marginal /5450 m/s-m/. TIME (CST) 11 AM 1 PM 3 PM 5 PM 7 PM 9 PM Sky (%).........22 46 63 54 32 7 Weather cov..... Weather type....NONE NONE NONE NONE NONE NONE Tstm cov........ CWR.............0 0 0 0 0 0 Chc of thdr (%).0 0 0 0 0 0 Temp............28 34 37 35 34 32 RH..............50 38 35 40 43 49 20 ft wind......W 6 W 7 W 8 SW 6 SW 6 SW 8 20 ft wind gust.11 13 13 12 12 16 Eye level wind..W 3 W 3 W 4 SW 3 SW 3 SW 4 Eye lvl wnd gst.5 6 6 6 6 7 Mix hgt (kft)...1.8 2.1 2.3 0.9 0.6 0.9 Transport wind..W 12 W 14 W 17 W 12 W 14 W 15 Vrate kt-ft/1K..18 26 35 9 8 12 Ventrate Cat....POOR POOR POOR POOR POOR POOR .TONIGHT... Sky/weather.........Partly cloudy (25-35 percent) then becoming mostly clear (5-15 percent). CWR.................0 percent. Chance of thunder...0 percent. Temperature.........Min 27. RH..................Max 85 percent. Eye level winds.....2-3 mph using an adjustment factor of 0.3. Wind (20 ft)........West winds 6 to 8 mph. Mixing height.......Min 600 ft AGL. Transport winds.....West 12 to 17 mph. Smoke dispersal.....Poor (990 m/s-m). .WEDNESDAY... Sky/weather.........Mostly sunny (40-50 percent). CWR.................0 percent. Chance of thunder...0 percent. Temperature.........Max 46. RH..................Min 60 percent. Eye level winds.....Light winds. Wind (20 ft)........Light winds becoming west around 5 mph early in the afternoon, then becoming light late in the afternoon. Mixing height.......Max 2600 ft AGL. Transport winds.....West 10 to 18 mph increasing to 14 to 20 mph late in the afternoon. Smoke dispersal.....Poor (900 m/s-m) early in the morning increasing to fair max (6870 m/s-m) in the afternoon. $$ Forecaster...Delia Requested by...Matt Pilz Type of request...PRESCRIBED .TAG 2528119.0/LSX .DELDT 12/30/25 .FormatterVersion 2.0.0