FNUS73 KLSX 190846 FWSLSX Spot Forecast for Port Hudson Lake Nubbin Unit...Miss National Weather Service Saint Louis MO 346 AM CDT Thu Mar 19 2026 Forecast is based on ignition time of 1000 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.........Mostly sunny (25-35 percent). CWR.................2 percent. Temperature.........58 at ignition...Max 77. RH..................57 percent at ignition...Min 33 percent. Eye level winds.....Calm to light and variable. Wind (20 ft)........Winds southwest at 2 mph at ignition...otherwise Light winds. Mixing height.......600 ft AGL at ignition...otherwise max 3700 ft AGL. Transport winds.....Southwest 8 to 12 mph. Smoke dispersal.....Poor /690 m/s-m/ at ignition. Max...marginal /5180 m/s-m/. TIME (CDT) 10 AM NOON 2 PM 4 PM 6 PM 8 PM Sky (%).........53 25 18 7 13 24 Weather cov..... Weather type....NONE NONE NONE NONE NONE NONE Tstm cov........ CWR.............0 0 0 0 0 0 Temp............58 68 74 77 75 67 RH..............57 44 37 35 37 50 20 ft wind......SW 2 SW 3 SW 2 SW 2 S 2 SE 1 20 ft wind gust.8 8 7 7 6 6 Eye level wind..SW 1 SW 1 SW 1 SW 1 S 1 SE 0 Eye lvl wnd gst.4 4 3 3 3 3 Mix hgt (kft)...0.6 1.8 3.1 3.6 1.1 0.3 Transport wind..SW 8 SW 9 SW 12 SW 10 S 7 S 8 Vrate kt-ft/1K..4 14 31 32 6 2 Ventrate Cat....POOR POOR POOR POOR POOR POOR .TONIGHT... Sky/weather.........Mostly clear (15-25 percent). CWR.................1 percent. Temperature.........Min 51. RH..................Max 83 percent. Eye level winds.....Calm to light and variable. Wind (20 ft)........Light winds. Mixing height.......Min 300 ft AGL. Transport winds.....Southwest 7 to 12 mph. Smoke dispersal.....Poor (350 m/s-m). .FRIDAY... Sky/weather.........Sunny (10-20 percent). CWR.................1 percent. Temperature.........Max 83. RH..................Min 33 percent. Eye level winds.....West winds at 1-3 mph early. Otherwise light and variable. Multiplication factor 0.3 Wind (20 ft)........West winds 5 to 7 mph early in the morning becoming light, then becoming west 5 to 7 mph in the late morning and afternoon. Mixing height.......Max 4500 ft AGL. Transport winds.....West 9 to 18 mph increasing to 17 to 21 mph late in the afternoon. Smoke dispersal.....Poor (420 m/s-m) early in the morning increasing to good max (12840 m/s-m) in the afternoon. $$ Forecaster...Maples Requested by...Matt Type of request...PRESCRIBED .TAG 2606369.0/LSX .DELDT 03/19/26 .FormatterVersion 2.0.0