FNUS73 KABR 211122 FWSABR Spot Forecast for Fort Sisseton RX...SDGFP National Weather Service Aberdeen SD 622 AM CDT Tue Apr 21 2026 Forecast is based on ignition time of 0700 CDT on April 21. If conditions become unrepresentative...contact the National Weather Service. .DISCUSSION...Winds will start out north-northeast early this morning, then gradually switch out of the east and finally southeast by early evening. Hourly trends are shown below. Gusts will generally be around 15 mph or less today, but will increase to over 20 mph later tonight, and over 30 mph by Wednesday afternoon. Humidity is forecast to lower to between 25 and 30 percent by late afternoon, but with a dry air mass in place, actual readings could be slightly lower than this. .REST OF TODAY... Sky/weather.........Mostly sunny (0-10 percent). CWR.................0 percent. Chance of pcpn......0 percent. Chance of lightning.0 percent. Max temperature.....Around 72. Min humidity........28 percent. Wind (20 ft)........Northeast winds 7 to 13 mph shifting to the southeast 7 to 8 mph late in the afternoon. Mixing height.......300-4300 ft agl. Transport winds.....Northeast 7 to 14 mph shifting to the southeast 7 to 8 mph late in the afternoon. Smoke dispersal.....Poor (4000 knot-ft). TIME (CDT) 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM Sky (%).........6 10 3 4 2 8 1 7 3 3 4 Weather cov..... Weather type.... Tstm cov........ Chc of pcpn (%).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 Temp............41 45 49 54 58 62 65 67 70 71 71 RH..............70 63 57 52 45 39 34 32 29 28 28 20 FT wind dir..NE NE NE E E E E E SE SE SE 20 FT wind spd..13 12 9 7 7 7 7 7 7 7 8 20 FT wind gust.18 18 16 13 13 13 13 13 14 14 15 Mix hgt (kft)...0.3 0.4 0.5 0.7 1.3 1.9 2.3 2.8 3.3 4.1 4.3 Smoke Dispersal.PR PR PR PR PR PR PR PR PR PR PR .TONIGHT... Sky/weather.........Mostly clear (10-20 percent). CWR.................0 percent. Chance of pcpn......0 percent. Chance of lightning.1 percent. Min temperature.....Around 51. Max humidity........61 percent. Wind (20 ft)........Southeast winds 8 to 13 mph. Gusts up to 24 mph in the late evening and overnight. Mixing height.......400-4000 ft agl. Transport winds.....South 9 to 18 mph increasing to 18 to 20 mph overnight. Smoke dispersal.....Poor (4200 knot-ft). TIME (CDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM Sky (%).........3 10 23 26 22 22 15 15 16 23 19 17 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............72 70 66 60 57 56 55 54 54 53 53 52 RH..............28 31 36 44 47 49 51 52 52 54 54 56 20 FT wind dir..SE SE SE SE SE SE S S S S S S 20 FT wind spd..8 9 9 10 10 10 12 13 13 13 13 13 20 FT wind gust.16 16 16 18 20 21 22 23 23 23 24 23 Mix hgt (kft)...4.0 0.8 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4 Smoke Dispersal.PR PR PR PR PR PR PR PR PR PR PR PR $$ Forecaster...TMT Requested by...Heath Stone Type of request...PRESCRIBED .TAG 2611061.0/ABR .DELDT 04/21/26 .FormatterVersion 2.0.0 .EMAIL heath.stone@state.sd.us