FNUS73 KLSX 201133 FWSLSX Spot Forecast for BLElementary...Missouri Department of Conservation National Weather Service Saint Louis MO 633 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... Well above normal temperatures will continue today with RH values hitting their minimum in the mid 20s this afternoon. Initially light southwesterly winds will become westerly and increase in speed to approximately 5-7 mph at 30 ft. There is only a 10% chance that winds will increase above 12 mph in the burn area, increasing confidence that elevated fire danger criteria will not be met. Mixing will reach above 1,000 ft between 11 AM and 12 PM today and continue to mix into the afternoon, reaching a maximum between 4,000-5,000 ft by 3-4 PM. Winds between 10-20 mph within the mixed layer this afternoon will promote good smoke dispersion. A weak, dry cold front will move into the area this evening between 9-11PM, and winds will become northerly behind it. Cooling temperatures with sunset will cause RH to increase and the mixed layer to collapse, trapping any lingering smoke at the surface. .REST OF TODAY... Sky/weather.........Sunny (10-20 percent). CWR.................0 percent. Chance of thunder...1 percent. Temperature.........68 at ignition...Max 85. RH..................55 percent at ignition...Min 24 percent. Eye level winds.....2-3 mph using an adjustment factor of 0.4. Wind (20 ft)........Winds west at 5 mph at ignition...otherwise West winds 5 to 6 mph. Mixing height.......1000 ft AGL at ignition...otherwise max 6600 ft AGL. Transport winds.....West 13 to 20 mph. Smoke dispersal.....Poor /1760 m/s-m/ at ignition. Max...good /13610 m/s-m/ increasing to good (14300 m/s-m) early in the morning increasing to excellent max (17520 m/s-m) in the afternoon late in the afternoon. TIME (CDT) 10 AM NOON 2 PM 4 PM 6 PM 8 PM Sky (%).........8 11 14 21 23 30 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............68 77 84 85 82 74 RH..............55 35 25 24 28 43 20 ft wind......W 5 W 6 W 6 W 6 W 4 W 3 20 ft wind gust.11 12 13 14 11 8 Eye level wind..W 2 W 3 W 3 W 3 W 2 W 1 Eye lvl wnd gst.5 6 6 6 5 4 Mix hgt (kft)...1.0 2.8 5.0 6.6 1.2 0.5 Transport wind..W 13 W 16 W 16 W 20 W 12 NW 8 Vrate kt-ft/1K..11 39 71 112 12 4 Ventrate Cat....POOR POOR GOOD VYGD POOR POOR .TONIGHT... Sky/weather.........Mostly clear (20-30 percent). CWR.................1 percent. Chance of thunder...4 percent. Temperature.........Min 52. RH..................Max 90 percent. Eye level winds.....Light winds. Wind (20 ft)........Light winds. Mixing height.......Min 400 ft AGL. Transport winds.....Northwest 8 to 12 mph shifting to the east 6 to 7 mph overnight. Smoke dispersal.....Poor (310 m/s-m). .SATURDAY... Sky/weather.........Sunny (5-15 percent). CWR.................1 percent. Chance of thunder...4 percent. Temperature.........Max 82. RH..................Min 37 percent. Eye level winds.....Light winds. Wind (20 ft)........Light winds. Mixing height.......Max 4000 ft AGL. Transport winds.....Southeast 5 to 8 mph decreasing to 3 to 5 mph late in the morning, then shifting to the west 3 to 7 mph late in the morning. Smoke dispersal.....Poor (300 m/s-m). $$ Forecaster...Delia Requested by...Luke Wehmhoff Type of request...PRESCRIBED .TAG 2606330.0/LSX .DELDT 03/20/26 .FormatterVersion 2.0.0