FNUS73 KLSX 200928 FWSLSX Spot Forecast for High Ridge...Missouri Department of Natural Resources National Weather Service Saint Louis MO 428 AM CDT Fri Mar 20 2026 Forecast is based on ignition time of 1100 CDT on March 20. If conditions become unrepresentative, contact the National Weather Service. .DISCUSSION... Well-above average temperatures will continue today along with seasonably low RH and no precipitation. An inversion will break around 11 am with RH quickly falling below 40 percent and mixing heights rising above 1000 ft AGL. Conditions will improve through early afternoon with 6 to 10 mph westerly winds and minimum RH as low as 25 to 30 percent along with mixing heights of 4000 to 4500 ft AGL, favoring good smoke dispersion. A weak, dry cold front will arrive this evening, veering winds to northerly. As temperatures cool through sunset, RH will rise again this evening along with mixing heights collapsing with the development of another inversion. .TODAY... Sky/weather.........Sunny (10-20 percent). CWR.................0 percent. Chance of thunder...1 percent. Temperature.........52 at ignition...Max 86. RH..................74 percent at ignition...Min 26 percent. Eye level winds.....Winds west 2 to 3 mph. An adjustment factor of 0.4 used. Wind (20 ft)........Winds west 6 to 8 mph. Mixing height.......400 ft AGL at ignition...otherwise max 4000 ft AGL. Transport winds.....Southwest 10 to 15 mph shifting to the west 16 to 20 mph in the afternoon. Smoke dispersal.....Poor /520 m/s-m/ at ignition. Max...good /10650 m/s-m/. TIME (CDT) 6 AM 8 AM 10 AM NOON 2 PM 4 PM Sky (%).........8 2 2 2 12 23 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............52 54 67 79 85 86 RH..............74 69 54 39 30 27 20 ft wind......S 4 SW 5 SW 7 W 8 W 9 W 9 20 ft wind gust.9 10 14 15 16 16 Eye level wind..S 2 SW 2 SW 3 W 4 W 4 W 4 Eye lvl wnd gst.4 5 6 7 7 7 Mix hgt (kft)...0.4 0.4 0.7 1.8 3.1 3.9 Transport wind..SW 10 SW 12 W 13 W 16 W 18 W 18 Vrate kt-ft/1K..3 4 8 25 49 63 Ventrate Cat....POOR POOR POOR POOR FAIR GOOD .TONIGHT... Sky/weather.........Mostly clear (10-20 percent). CWR.................1 percent. Chance of thunder...3 percent. Temperature.........Min 52. RH..................Max 83 percent. Eye level winds.....Northwest winds around 2 mph early in the evening becoming light. An adjustment factor of 0.4 used. Wind (20 ft)........Northwest winds around 5 mph early in the evening becoming light. Mixing height.......Min 400 ft AGL. Transport winds.....Northwest around 9 mph shifting to the southeast early in the morning. Smoke dispersal.....Poor (440 m/s-m). .SATURDAY... Sky/weather.........Sunny (0-10 percent). CWR.................1 percent. Chance of thunder...2 percent. Temperature.........Max 85. RH..................Min 29 percent. Eye level winds.....Southwest winds 2 to 3 mph. An adjustment factor of 0.4 used. Wind (20 ft)........Southwest winds 5 to 7 mph. Mixing height.......Max 3600 ft AGL. Transport winds.....South 5 to 9 mph shifting to the west 7 to 13 mph late in the morning. Smoke dispersal.....Poor (310 m/s-m) early in the morning increasing to fair max (6250 m/s-m) in the afternoon. $$ Forecaster...Pfahler Requested by...Roxie Campbell Type of request...PRESCRIBED .TAG 2606641.0/LSX .DELDT 03/20/26 .FormatterVersion 2.0.0