FNUS73 KLSX 190834 FWSLSX Spot Forecast for Pyles_MDC...MDC National Weather Service Saint Louis MO 334 AM CDT Thu Mar 19 2026 Forecast is based on ignition time of 1200 CDT on March 19. If conditions become unrepresentative, contact the National Weather Service. .DISCUSSION... Temperatures will be well above normal today through Saturday, and Sunday for location along and south of I-44 in Missouri and south of I-70 in Illinois. Highs will ranges through the 70s to low-80s each of the next three days with cooler temperatures entering northern Missouri and west-central Illinois Sunday. Minimum RH values range from near 30 percent to 45 percent across the region with the lowest values extending from south-central Missouri through southeast Missouri. Light south-southwesterly flow is expected today with speeds around or less than 5 mph. Mixing heights generally range from 3,000 feet to 5,000 feet. Transport winds remain weak over much of the region with poor ventilation rates. The one exception is over southeast Missouri, near and northeast of the Ozarks, where slightly stronger transport winds result in fair ventilation and slightly higher mixing heights that peak just below 6,000 feet. Minimum RH values remain fairly consistent now through the weekend. However, the pick day is likely Friday with slightly better transport winds and some improvement to ventilation. Conditions return to fair/poor categories Saturday. .REST OF TODAY... Sky/weather.........Sunny (10-20 percent). CWR.................1 percent. Chance of thunder...2 percent. Temperature.........67 at ignition...Max 76. RH..................49 percent at ignition...Min 37 percent. Eye level winds.....Light and variable. Wind (20 ft)........Winds south at 3 mph at ignition...otherwise South winds around 5 mph early in the afternoon becoming light, then becoming south around 5 mph late in the afternoon. Mixing height.......2200 ft AGL at ignition...otherwise max 4500 ft AGL. Transport winds.....Southwest 6 to 9 mph. Smoke dispersal.....Poor /1700 m/s-m/ at ignition. Max...poor /4450 m/s-m/. TIME (CDT) NOON 2 PM 4 PM 6 PM 8 PM 10 PM Sky (%).........27 9 8 4 7 22 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............67 74 76 73 64 60 RH..............49 38 37 41 58 64 20 ft wind......S 3 S 4 S 5 S 5 S 4 S 4 20 ft wind gust.7 8 9 9 7 7 Eye level wind..S 1 S 2 S 2 S 2 S 2 S 2 Eye lvl wnd gst.3 4 4 4 3 3 Mix hgt (kft)...2.2 4.1 4.3 0.9 0.5 0.5 Transport wind..SW 6 SW 7 S 7 S 9 S 10 S 12 Vrate kt-ft/1K..11 24 26 7 4 5 Ventrate Cat....POOR POOR POOR POOR POOR POOR .TONIGHT... Sky/weather.........Mostly clear (15-25 percent). CWR.................1 percent. Chance of thunder...2 percent. Temperature.........Min 53. RH..................Max 83 percent. Eye level winds.....Light and variable. Wind (20 ft)........South winds around 5 mph early in the evening becoming light. Mixing height.......Min 500 ft AGL. Transport winds.....South 9 to 15 mph. Smoke dispersal.....Poor (660 m/s-m). .FRIDAY... Sky/weather.........Sunny (15-25 percent). CWR.................1 percent. Chance of thunder...2 percent. Temperature.........Max 83. RH..................Min 34 percent. Eye level winds.....Southwest winds at 2-3 mph early in the morning, becoming west at 2-3 mph in the afternoon. Otherwise, light and variable. Multiplication factor 0.4 Wind (20 ft)........Southwest winds 5 to 7 mph early in the morning becoming light, then becoming west 5 to 7 mph in the afternoon. Mixing height.......Max 5200 ft AGL. Transport winds.....West 8 to 17 mph. Smoke dispersal.....Poor (720 m/s-m) early in the morning increasing to good max (11940 m/s-m) in the afternoon. $$ Forecaster...Maples Requested by...Luke Wehmhoff Type of request...PRESCRIBED .TAG 2606329.0/LSX .DELDT 03/19/26 .FormatterVersion 2.0.0