FNUS73 KFSD 201157 FWSFSD Spot Forecast for DAN GREENE SLOIGH...USFWS National Weather Service Sioux Falls SD 657 AM CDT Mon Apr 20 2026 If conditions become unrepresentative, contact the National Weather Service. .DISCUSSION... Issued at 658 AM CDT Mon Apr 20 2026 Heading into the Iowa Great Lakes, a warm and breezy day is expected. As mixing resumes, should see smoke dispersal rates improve. Southeasterly winds will become more southerly by late morning with wind gusts between 25-35 mph possible through early evening. Lower dew points will lead to near-critical RH values in the 25-30 percent range which will lead to high fire danger through this evening. .TODAY... Max temperature.....Around 68. Min humidity........25 percent. TIME (CDT) 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM Sky cover.......MCR MCR CLR CLR CLR CLR MCR PC PC PC PC Sky (%).........14 13 4 2 1 2 9 32 29 33 35 Weather cov..... Weather type.... Tstm cov........ Chc of pcpn (%).0 0 0 0 0 0 0 0 0 0 0 Chc of thdr (%).0 0 0 0 0 0 0 0 0 0 0 Temp............32 36 41 45 49 54 58 61 65 66 68 Dewpoint........20 23 25 27 30 28 27 27 28 30 32 RH..............63 57 53 51 49 38 32 27 25 27 28 20 FT wind dir..E SE SSE S S S S S S S S 20 FT wind spd..7 10 14 17 20 21 22 22 23 23 23 20 FT wind gust. 13 20 25 28 30 31 32 33 33 33 Mix hgt (kft)...0.4 0.7 1.3 1.6 2.1 2.3 2.9 3.1 3.4 3.6 3.8 Transp wind dir.SSE S S S S S S S S S S Transp wind spd.12 15 20 21 21 22 22 23 24 24 25 Smoke Dispersal.PR PR FR FR GD GD GD EX EX EX EX .TONIGHT... Min temperature.....Around 45. Max humidity........76 percent. TIME (CDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM Sky cover.......PC PC PC PC PC PC MCR MCR MCR MCR MCR MCR Sky (%).........33 32 30 31 41 39 25 15 11 6 8 8 Weather cov..... Weather type.... Tstm cov........ Chc of pcpn (%).0 0 0 0 0 0 0 0 0 0 0 0 Chc of thdr (%).0 0 0 0 0 0 0 0 0 0 0 0 Temp............68 66 61 58 54 53 52 51 49 48 47 47 Dewpoint........33 35 38 39 40 40 41 42 41 40 39 39 RH..............28 33 42 53 59 61 66 71 71 71 71 71 20 FT wind dir..S S S S SSE SSE S S S SSW SW SW 20 FT wind spd..21 20 15 13 10 10 10 10 9 9 9 8 20 FT wind gust.31 29 24 21 17 17 17 17 16 16 16 14 Mix hgt (kft)...3.5 1.1 0.6 0.6 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.4 Transp wind dir.S S S S S S S SSW SSW SW SW SW Transp wind spd.25 24 16 15 15 14 14 13 14 16 16 14 Smoke Dispersal.EX FR PR PR PR PR PR PR PR PR PR PR .TUESDAY... Max temperature.....Around 78. Min humidity........27 percent. TIME (CDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM Sky cover.......MCR MCR MCR MCR MCR MCR MCR MCR CLR CLR MCR MCR Sky (%).........7 7 8 9 12 9 14 6 4 5 6 7 Weather cov..... Weather type.... Tstm cov........ Chc of pcpn (%).0 0 0 0 0 0 0 0 0 0 0 0 Chc of thdr (%).0 0 0 0 0 0 0 0 0 0 0 0 Temp............46 46 49 55 61 66 70 73 76 77 78 78 Dewpoint........39 39 39 42 43 44 44 43 42 41 41 41 RH..............74 76 68 61 51 45 39 34 30 28 27 27 20 FT wind dir..W W NW N N NNE NE NE NE NE NE NE 20 FT wind spd..7 7 7 7 7 8 8 8 8 8 7 7 20 FT wind gust.13 10 12 12 12 13 13 13 13 13 12 12 Mix hgt (kft)...0.4 0.4 0.4 0.7 1.2 1.7 2.3 3.1 3.8 4.3 4.7 3.8 Transp wind dir.WSW W NNW N NNE NNE NNE NNE NNE NNE NNE NE Transp wind spd.12 9 8 9 13 13 13 10 8 7 7 7 Smoke Dispersal.PR PR PR PR FR FR FR FR FR FR FR FR $$ Forecaster...IG Requested by...RYAN HARR Type of request...PRESCRIBED .TAG 2610825.0/FSD .DELDT 04/20/26 .FormatterVersion 2.0.0 .EMAIL ryan_harr@fws.gpv