FNUS73 KFSD 151143 FWSFSD Spot Forecast for Garlock Slough...WFS National Weather Service Sioux Falls SD 643 AM CDT Wed Apr 15 2026 If conditions become unrepresentative, contact the National Weather Service. .DISCUSSION... Isolated showers and thunderstorms continue today, with the better chances this afternoon and evening. Light east-northeast winds are expected with gusts around 10 mph. Temperatures warm to around 70, with minimum humidity values around 40%. Mixing heights remain fairly low through the day with mid and high clouds. Winds become variable overnight, shifting southerly for Thursday. Gusts around 20 mph expected during the afternoon and evening, with humidity around 30%. Much warmer Thursday with high near 80. Winds remain breezy with gusts 20 to 25 mph Thursday night. .REST OF TODAY... Max temperature.....Around 70. Min humidity........42 percent. TIME (CDT) 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM Sky cover.......PC MC MC MC PC MC MC MC MC MC Sky (%).........43 60 54 55 47 51 60 54 56 64 Weather cov..... SCH SCH SCH SCH Weather type.... RW RW RW RW Tstm cov........ Chc of pcpn (%).10 10 10 10 10 20 20 20 20 10 Chc of thdr (%).0 0 0 0 0 0 0 0 0 0 Temp............46 49 55 59 62 65 67 68 69 68 Dewpoint........43 45 46 46 46 46 45 45 45 45 RH..............89 86 72 62 56 50 45 44 42 44 20 FT wind dir..NNE NE NE NE NE ENE ENE ENE ENE ENE 20 FT wind spd..6 6 6 7 8 8 8 8 8 8 20 FT wind gust.8 9 9 10 12 12 12 12 12 12 Mix hgt (kft)...0.4 0.9 1.2 1.6 2.2 2.7 3.1 3.5 3.8 3.4 Transp wind dir.NNE NE NE NE NNE NE NE ENE E E Transp wind spd.8 8 8 8 8 9 8 8 9 9 Smoke Dispersal.PR PR PR PR FR FR FR FR GD FR .TONIGHT... Min temperature.....Around 45. Max humidity........93 percent. TIME (CDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM Sky cover.......MC MC MC PC PC PC PC PC PC PC MCR MCR Sky (%).........57 55 54 50 48 49 45 47 39 28 18 12 Weather cov.....SCH Weather type....RW Tstm cov........ Chc of pcpn (%).20 10 10 10 10 10 10 0 10 0 0 0 Chc of thdr (%).0 M M M M M M M M M M M Temp............67 65 61 58 56 55 53 51 50 49 48 47 Dewpoint........45 46 47 48 48 48 47 47 45 45 44 44 RH..............45 50 60 69 74 77 80 86 83 86 86 89 20 FT wind dir..E ENE ENE E ENE NE NNE N N NNW WNW WNW 20 FT wind spd..7 7 7 6 6 6 6 6 6 6 6 6 20 FT wind gust.12 12 10 10 9 9 9 9 9 9 9 9 Mix hgt (kft)...2.5 1.4 0.5 0.5 0.4 0.4 0.3 0.3 0.3 0.3 0.3 0.3 Transp wind dir.ENE E E E E E E E SE SE SSE S Transp wind spd.9 9 7 8 8 9 9 10 10 12 9 9 Smoke Dispersal.FR PR PR PR PR PR PR PR PR PR PR PR .THURSDAY... Max temperature.....Around 80. Min humidity........28 percent. TIME (CDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM Sky cover.......MCR MCR MCR MCR CLR CLR CLR CLR CLR CLR CLR CLR Sky (%).........9 6 11 9 5 3 2 2 2 1 1 2 Weather cov..... Weather type.... Tstm cov........ Chc of pcpn (%).0 0 0 0 0 0 0 0 0 0 0 0 Chc of thdr (%).M M M M M M M M M M M M Temp............46 45 48 54 61 66 71 74 77 79 80 80 Dewpoint........43 43 44 46 47 47 47 47 46 45 44 44 RH..............89 93 86 74 60 50 42 38 33 30 28 28 20 FT wind dir..W W S S S S S S S S S S 20 FT wind spd..6 6 7 8 10 10 13 14 15 16 16 16 20 FT wind gust.9 9 12 14 15 17 18 21 22 23 23 22 Mix hgt (kft)...0.3 0.3 0.4 0.7 1.2 2.3 3.3 4.4 4.7 5.0 5.2 4.0 Transp wind dir.S S S S S S S S SSW SSW SSW SSW Transp wind spd.9 10 12 12 14 18 23 25 26 26 25 23 Smoke Dispersal.PR PR PR PR FR GD EX EX EX EX EX EX $$ Forecaster...SG Requested by...Logan Baird Type of request...PRESCRIBED .TAG 2610299.1/FSD .DELDT 04/15/26 .FormatterVersion 2.0.0 .EMAIL Jhiggins@nltfpd.net,lbaird@blm.gov