631 FNUS73 KLSX 281057 FWSLSX Spot Forecast for TP Unit...Missouri Department of Conservation National Weather Service Saint Louis MO 457 AM CST Sat Feb 28 2026 Forecast is based on ignition time of 1000 CST on February 28. If conditions become unrepresentative, contact the National Weather Service. .DISCUSSION... Today's wind and humidity forecast will be challenging, as a low pressure system will cause winds to shift constantly throughout the burn period. Winds will likely begin the day out of the east, then gradually shift to the south, and then southwest by mid to late afternoon. While speeds are expected to be mostly light, some stronger gusts will be possible, particularly in the afternoon when the southwesterlies arrive. Humidity is also expected to be relatively low, but not as low as yesterday. In spite of the lingering dry air, a few very light showers or sprinkles may reach the surface during the day, but likely not enough to accumulate. If rain does reach the surface, humidity is likely to remain slightly higher than the forecast below. Persistent cloud cover may also limit mixing and inhibit smoke dispersion, which will likely be challenging already due to the shifting winds. This evening, a cold front will push through the area and switch winds to the north. Winds will remain northerly through the night and gradually become northeasterly tomorrow morning. Much cooler temperatures are expected tomorrow, but humidity will remain relatively low until widespread light rain and possibly some snow arrive overnight tomorrow. .REST OF TODAY... Sky/weather.........Mostly sunny (40-50 percent) then becoming mostly cloudy (70-80 percent). Slight chance of rain in the late morning and afternoon, then chance of rain late in the afternoon. CWR.................4 percent. Chance of thunder...7 percent. Temperature.........54 at ignition...Max 69. RH..................44 percent at ignition...Min 33 percent. Eye level winds.....Highly variable wind direction through the day. East 1 to 3 mph at ignition, gradually shifting to south, then southwest by 2 pm. Maximum speeds 2 to 4 mph sustained with gusts to 8 mph between 2 and 5 pm. Wind (20 ft)........Highly variable wind direction through the day. East 4 to 7 mph at ignition, gradually shifting to south, then southwest by 2 pm. Maximum speeds 5 to 9 mph sustained with gusts to 18 mph between 2 and 5 pm. Mixing height.......1300 ft AGL at ignition...otherwise max 2400 ft AGL. Transport winds.....Southeast around 13 mph shifting to the south 9 to 16 mph in the afternoon. Smoke dispersal.....Poor /2230 m/s-m/ at ignition. Max...marginal /5070 m/s-m/. TIME (CST) 10 AM NOON 2 PM 4 PM 6 PM 8 PM Sky (%).........39 39 58 73 57 57 Weather cov.....S CHC S CHC S CHC S CHC S CHC Weather type....RAIN RAIN RAIN RAIN RAIN NONE Tstm cov........ CWR.............0 0 0 0 0 0 Chc of thdr (%).0 10 10 10 10 10 Temp............54 61 67 69 63 58 RH..............44 38 34 33 44 53 20 ft wind......E 6 SE 7 S 7 S 6 SW 6 SW 7 20 ft wind gust.13 14 15 14 13 15 Eye level wind..E 3 SE 3 S 3 S 3 SW 3 SW 3 Eye lvl wnd gst.6 6 7 6 6 7 Mix hgt (kft)...1.3 2.1 2.3 1.6 0.2 0.4 Transport wind..SE 13 S 15 S 16 SW 14 SW 9 SW 10 Vrate kt-ft/1K..14 27 32 19 2 3 Ventrate Cat....POOR POOR POOR POOR POOR POOR .TONIGHT... Sky/weather.........Mostly cloudy (55-65 percent) then becoming partly cloudy (25-35 percent). Slight chance of rain early in the evening. CWR.................4 percent. Chance of thunder...8 percent. Temperature.........Min 31. RH..................Max 75 percent. Eye level winds.....North 1 to 3 mph. Wind (20 ft)........North 4 to 8 mph. Mixing height.......Min 200 ft AGL. Transport winds.....Southwest 9 to 10 mph shifting to the north 14 to 16 mph in the late evening and overnight. Smoke dispersal.....Poor (240 m/s-m). .SUNDAY... Sky/weather.........Partly sunny (55-65 percent) then becoming cloudy (85-95 percent). Slight chance of snow early in the afternoon. Slight chance of rain in the afternoon. CWR.................7 percent. Chance of thunder...1 percent. Temperature.........Max 46. RH..................Min 42 percent. Eye level winds.....Northeast 2 to 4 mph. Wind (20 ft)........Northeast 5 to 9 mph. Mixing height.......Max 2400 ft AGL. Transport winds.....Northeast 14 to 16 mph. Smoke dispersal.....Poor (2440 m/s-m) early in the morning increasing to marginal max (4890 m/s-m) in the afternoon. $$ Forecaster...19 Requested by...David Shieh Type of request...PRESCRIBED .TAG 2604295.0/LSX .DELDT 02/28/26 .FormatterVersion 2.0.0