FNUS73 KLSX 201034 FWSLSX Spot Forecast for Magnolia Hollow Grass...Missouri Department of Conservation National Weather Service Saint Louis MO 534 AM CDT Fri Mar 20 2026 Forecast is based on ignition time of 0900 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.........59 at ignition...Max 84. RH..................75 percent at ignition...Min 25 percent. Eye level winds.....1-2 mph using an adjustment factor of 0.3. Wind (20 ft)........Winds southwest at 4 mph at ignition...otherwise Light winds becoming west 5 to 6 mph in the late morning and afternoon. Mixing height.......400 ft AGL at ignition...otherwise max 6200 ft AGL. Transport winds.....West 8 to 17 mph increasing to 16 to 18 mph late in the afternoon. Smoke dispersal.....Poor /490 m/s-m/ at ignition. Max...excellent /15510 m/s-m/. TIME (CDT) 9 AM 11 AM 1 PM 3 PM 5 PM 7 PM Sky (%).........9 8 11 20 19 27 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............59 72 80 83 83 76 RH..............75 48 30 25 26 39 20 ft wind......SW 4 W 6 W 6 W 6 W 6 W 4 20 ft wind gust.10 11 12 13 12 9 Eye level wind..SW 2 W 3 W 3 W 3 W 3 W 2 Eye lvl wnd gst.5 5 6 6 6 4 Mix hgt (kft)...0.4 1.4 3.5 5.6 4.1 0.4 Transport wind..W 8 W 13 W 15 W 17 W 16 W 8 Vrate kt-ft/1K..3 15 46 84 58 3 Ventrate Cat....POOR POOR FAIR GOOD FAIR POOR .TONIGHT... Sky/weather.........Mostly clear (20-30 percent). CWR.................1 percent. Chance of thunder...4 percent. Temperature.........Min 50. RH..................Max 96 percent. Eye level winds.....1-2 mph using an adjustment factor of 0.3. Wind (20 ft)........West winds around 5 mph early in the evening becoming light. Mixing height.......Min 300 ft AGL. Transport winds.....Northwest 8 to 12 mph shifting to the east overnight. Smoke dispersal.....Poor (270 m/s-m). .SATURDAY... Sky/weather.........Sunny (5-15 percent). CWR.................1 percent. Chance of thunder...4 percent. Temperature.........Max 80. RH..................Min 39 percent. Eye level winds.....Light winds. Wind (20 ft)........Light winds. Mixing height.......Max 3600 ft AGL. Transport winds.....Southeast 5 to 8 mph shifting to the west 5 to 6 mph late in the morning. Smoke dispersal.....Poor (250 m/s-m). $$ Forecaster...Delia Requested by...Anthony B King Type of request...PRESCRIBED .TAG 2606708.0/LSX .DELDT 03/20/26 .FormatterVersion 2.0.0