135 FNUS73 KLSX 301333 FWSLSX Spot Forecast for Horton Farm Unit 3...Missouri Department of Conservation National Weather Service Saint Louis MO 733 AM CST Tue Dec 30 2025 Forecast is based on ignition time of 0900 CST on December 30. If conditions become unrepresentative, contact the National Weather Service. .DISCUSSION... Light northwest wind will turn slowly to the west and then southwest by the end of the day as a ridge of high pressure crosses the area. There is a strong inversion this morning with mixing heights below 1000 feet. It is unlikely that the mixing height will rise above 1600 feet until 1200 to 100 PM. Light winds below the inversion will produce poor ventilation rates. .REST OF TODAY... Sky/weather.........Sunny (15-25 percent) then becoming partly sunny (55-65 percent). CWR.................0 percent. Chance of thunder...0 percent. Temperature.........20 at ignition...Max 37. RH..................67 percent at ignition...Min 34 percent. Eye level winds.....Light northwest wind at ignition turning to the west by around noon and then the southwest by 400 to 500 PM. Wind (20 ft)........Winds northwest at 7 mph at ignition...otherwise West winds 6 to 7 mph shifting to the southwest around 6 mph late in the afternoon. Mixing height.......900 ft AGL at ignition...otherwise max 2500 ft AGL. Transport winds.....West 10 to 16 mph. Smoke dispersal.....Poor /2260 m/s-m/ at ignition. Max...marginal /5590 m/s-m/. TIME (CST) 9 AM 11 AM 1 PM 3 PM 5 PM 7 PM Sky (%).........2 5 25 54 57 32 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............20 28 33 36 35 32 RH..............67 48 38 35 38 45 20 ft wind......NW 7 W 6 W 6 W 7 SW 6 SW 6 20 ft wind gust.13 11 11 13 11 12 Eye level wind..NW 3 W 3 W 3 W 3 SW 3 SW 3 Eye lvl wnd gst.6 5 5 6 5 6 Mix hgt (kft)...1.3 1.8 2.2 2.5 1.0 0.6 Transport wind..NW 13 NW 13 W 13 W 16 W 10 W 14 Vrate kt-ft/1K..14 20 25 36 9 7 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 81 percent. Eye level winds.....Light southwest wind shifting to the west. Wind (20 ft)........Southwest winds around 6 mph shifting to the west 7 to 9 mph after 3 am. Mixing height.......Min 600 ft AGL. Transport winds.....West 13 to 18 mph. Smoke dispersal.....Poor (1040 m/s-m). .WEDNESDAY... Sky/weather.........Mostly sunny (35-45 percent). CWR.................0 percent. Chance of thunder...0 percent. Temperature.........Max 45. RH..................Min 58 percent. Eye level winds.....Light west wind. Wind (20 ft)........West winds 5 to 7 mph. Mixing height.......Max 2500 ft AGL. Transport winds.....West 12 to 18 mph. Smoke dispersal.....Poor (1040 m/s-m) early in the morning increasing to fair max (6100 m/s-m) in the afternoon. $$ Forecaster...Carney Requested by...Cassidy Morrison Type of request...PRESCRIBED .TAG 2528136.0/LSX .DELDT 12/30/25 .FormatterVersion 2.0.0