FNUS73 KABR 202022 FWSABR Spot Forecast for Clarksean RX...State of South Dakota National Weather Service Aberdeen SD 322 PM CDT Mon Apr 20 2026 Forecast is based on ignition time of 1200 CDT on April 21. If conditions become unrepresentative...contact the National Weather Service. ...RED FLAG WARNING IN EFFECT UNTIL 8 PM CDT THIS EVENING... .DISCUSSION... A cold front is forecast to move through the Clarksean RX area by 2100 this evening, with winds shifting out of the north and then being out of the east and southeast during the day Tuesday. Winds will remain around 10 mph or less through much of the day Tuesday. Relative humidity will fall to around 25 percent. Winds will increase Tuesday night, with gusts of 20 to 25 mph overnight. Relative humidity recoveries Tuesday night will be near 60 percent, before falling between 25 and 30 percent again Wednesday afternoon. Winds will increase out of the south Wednesday, 15 to 25 mph with gusts up to 35 mph. Wednesday will be partly sunny and breezy with highs in the mid 80s. .TUESDAY... Sky/weather.........Mostly sunny (5-15 percent). CWR.................0 percent. Chance of pcpn......0 percent. Chance of lightning.0 percent. Max temperature.....Around 74. Min humidity........26 percent. Wind (20 ft)........East winds 8 to 9 mph. Mixing height.......2200-5300 ft agl. Transport winds.....East 8 to 9 mph shifting to the southeast late in the afternoon. Smoke dispersal.....Poor (17900 knot-ft) early in the morning increasing to fair (42400 knot-ft) in the afternoon. TIME (CDT) 12P 1PM 2PM 3PM 4PM 5PM Sky (%).........3 2 5 7 6 17 Weather cov..... Weather type.... Tstm cov........ Chc of pcpn (%).0 0 0 0 0 0 Chc of ltng (%).0 0 0 0 0 0 Temp............65 68 69 72 73 73 RH..............35 32 32 29 28 28 20 FT wind dir..E E E E SE SE 20 FT wind spd..8 8 9 9 9 9 20 FT wind gust.14 14 14 14 14 14 Mix hgt (kft)...2.2 3.1 4.0 4.9 5.2 5.3 Smoke Dispersal.PR PR PR PR FR FR .TUESDAY NIGHT... Sky/weather.........Mostly clear (10-20 percent). CWR.................0 percent. Chance of pcpn......0 percent. Chance of lightning.0 percent. Min temperature.....Around 50. Max humidity........59 percent. Wind (20 ft)........Southeast winds 9 to 14 mph. Mixing height.......400-4700 ft agl. Transport winds.....Southeast 9 to 18 mph shifting to the south 18 to 20 mph overnight. Smoke dispersal.....Poor (5800 knot-ft). TIME (CDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM Sky (%).........16 18 15 12 8 8 9 9 12 15 18 22 Weather cov..... Weather type.... Tstm cov........ Chc of pcpn (%).0 0 0 0 0 0 0 0 0 0 0 0 Chc of ltng (%).0 0 0 0 0 0 0 0 0 0 0 0 Temp............74 72 68 64 59 56 54 53 52 51 51 50 RH..............26 30 35 40 45 49 52 52 54 56 56 58 20 FT wind dir..SE SE SE SE SE SE SE SE SE SE SE SE 20 FT wind spd..9 10 10 10 10 12 12 13 13 14 14 14 20 FT wind gust.15 15 16 17 18 20 20 21 22 22 23 23 Mix hgt (kft)...4.7 3.1 0.7 0.6 0.4 0.4 0.5 0.5 0.5 0.5 0.5 0.4 Smoke Dispersal.PR PR PR PR PR PR PR PR PR PR PR PR $$ Forecaster...KF Requested by...Brett Blank Type of request...PRESCRIBED .TAG 2610964.0/ABR .DELDT 04/20/26 .FormatterVersion 2.0.0 .EMAIL brett.blank@state.sd.us