FNUS73 KLSX 202319 FWSLSX Spot Forecast for Jayhawker Hollow Fire...Mark Twain NF National Weather Service Saint Louis MO 619 PM CDT Fri Mar 20 2026 Forecast is based on forecast start time of 1800 CDT on March 20. If conditions become unrepresentative, contact the National Weather Service. .DISCUSSION... Very warm temperatures today will quickly fall off into the lower to mid 50s tonight. Relative humidity values will also increase to around 30 percent by 8 or 9 PM. Saturday, another day of warm temperatures is forecast with deep mixing likely. Some model guidance is showing the potential for mixing up towards 10,000 ft AGL. .TONIGHT... Sky/weather.........Mostly clear (5-15 percent). CWR.................0 percent. Chance of thunder...0 percent. Temperature.........85 at forecast start...Min 55. RH..................20 percent at forecast start...Max 80 percent. Eye level winds.....Calm to light and variable. Wind (20 ft)........Winds southwest at 4 mph at forecast start...otherwise Light winds. Mixing height.......7800 ft AGL at forecast start with a rapid collapse towards 300 ft AGL. Transport winds.....West 8 to 12 mph. Smoke dispersal.....Poor /1560 m/s-m/ at forecast start. Min...poor /330 m/s-m/. TIME (CDT) 6 PM 8 PM 10 PM MIDNGT 2 AM 4 AM Sky (%).........3 13 16 11 9 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............85 76 69 64 61 58 RH..............20 28 45 58 67 72 20 ft wind......SW 4 SW 3 SW 3 SW 4 SW 3 W 3 20 ft wind gust.10 7 9 11 9 7 Eye level wind..SW 2 SW 1 SW 1 SW 2 SW 1 W 1 Eye lvl wnd gst.5 3 4 5 4 3 Mix hgt (kft)...7.8 0.3 0.3 0.3 0.3 0.3 Transport wind..W 9 SW 8 SW 10 SW 12 W 12 W 10 Vrate kt-ft/1K..10 2 3 3 3 2 Ventrate Cat....POOR POOR POOR POOR POOR POOR .SATURDAY... Sky/weather.........Sunny (0-10 percent). CWR.................0 percent. Chance of thunder...0 percent. Temperature.........Max 92. RH..................Min 20 - 25 percent. Eye level winds.....Light winds. Wind (20 ft)........Light winds. Mixing height.......Max 7500 to 8000 ft AGL. Transport winds.....Northwest 6 to 8 mph. Smoke dispersal.....Poor (250 m/s-m) early in the morning increasing to fair max (6880 m/s-m) in the afternoon. .SATURDAY NIGHT... Sky/weather.........Clear (0-10 percent). CWR.................0 percent. Chance of thunder...0 percent. Temperature.........Min 61. RH..................Max 78 percent. Eye level winds.....Light and variable. Wind (20 ft)........Light winds becoming south 5 to 6 mph early in the evening, then becoming light overnight. Mixing height.......Min 300 ft AGL. Transport winds.....Southwest 6 to 13 mph. Smoke dispersal.....Poor (300 m/s-m). .SUNDAY... Sky/weather.........Sunny (10-20 percent). CWR.................0 percent. Chance of thunder...1 percent. Temperature.........Max 88. RH..................Min 30 percent. Eye level winds.....Light southwest winds with some gusts 5 to 8 mph. Wind (20 ft)........Light winds becoming southwest 5 to 6 mph with gusts to around 19 mph in the late morning and afternoon, then shifting to the west around 6 mph with gusts to around 19 mphlate in the afternoon. Mixing height.......Max 4900 ft AGL. Transport winds.....Southwest 14 to 22 mph shifting to the west around 20 mph late in the afternoon. Smoke dispersal.....Poor (770 m/s-m) early in the morning increasing to good max (12410 m/s-m) in the afternoon. $$ Forecaster...BAH Requested by...Patric Marlow Type of request...WILDFIRE .TAG 2606891.0/LSX .DELDT 03/20/26 .FormatterVersion 2.0.0