FNUS73 KBIS 151115 FWSBIS Spot Forecast for SW Floodplain...NPS/WFS National Weather Service Bismarck ND 615 AM CDT Wed Apr 15 2026 Forecast is based on ignition time of 0900 MDT on April 15. If conditions become unrepresentative, contact the National Weather Service. .DISCUSSION... Weak surface high pressure over the region today, with dry and mild weather through this afternoon. Percent relative humidity will drop into the lower 20s, though westerly winds will be relatively light. A weather disturbance will drive a cold front through the area on Thursday, resulting in increasing wind and temperatures trending cooler and relative humidity higher. .REST OF TODAY... Sky/weather.........Mostly sunny. CWR.................1 percent. Chance of pcpn......0 percent. Max temperature.....Around 70. Min humidity........24 percent. Wind (20 ft)........West winds 6 to 7 mph. Mixing height.......8800 ft AGL. Transport winds.....West 13 to 16 mph. Smoke dispersal.....Poor (12000 knot-ft) early in the morning increasing to very good (104800 knot-ft) in the afternoon. TIME (MDT) 9AM 10A 11A 12P 1PM 2PM 3PM 4PM Sky (%).........42 40 39 38 41 45 48 54 Weather cov..... Weather type.... Tstm cov........ CWR.............0 0 0 0 0 0 0 0 Chc of pcpn (%).0 0 0 0 0 0 0 0 Temp............53 57 60 62 65 67 69 69 RH..............46 40 36 34 30 27 24 24 20 FT wind dir..W W W W SW W W SW 20 FT wind spd..6 6 6 7 7 7 7 7 20 FT wind gust.10 10 11 12 12 12 12 11 Mix hgt (kft)...1.0 2.3 3.9 5.8 7.2 8.1 8.8 8.5 Transp wind dir.W W W W W W SW SW Transp wind spd.14 14 13 13 14 15 16 16 Dispr kt-ft/1K..12 28 43 64 87 105 124 120 .TONIGHT... Sky/weather.........Mostly cloudy. CWR.................2 percent. Chance of pcpn......10 percent. Min temperature.....Around 39. Max humidity........82 percent. Wind (20 ft)........Southerly winds 5 to 8 mph shifting to the west around 7 mph late. Mixing height.......0 ft AGL. Transport winds.....Southwest 6 to 14 mph shifting to the south 7 to 14 mph in the late evening and overnight. Smoke dispersal.....Good (98600 knot-ft) early in the evening decreasing to poor (0 knot-ft) late in the night. TIME (MDT) 5PM 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM Sky (%).........59 65 69 73 76 76 74 72 59 47 34 35 Weather cov..... Weather type.... Tstm cov........ CWR.............0 0 0 0 0 0 0 0 0 0 0 0 Chc of pcpn (%).0 0 10 10 10 0 0 0 0 0 0 0 Temp............69 68 66 61 58 56 54 52 50 48 46 44 RH..............24 26 29 35 40 43 47 50 56 60 68 73 20 FT wind dir..SW SW S S SE SE SE SE S S SW W 20 FT wind spd..6 5 5 6 6 7 8 8 8 8 7 7 20 FT wind gust.10 8 7 8 8 9 10 11 11 10 10 10 Mix hgt (kft)...8.2 7.0 1.4 0.1 0.2 0.1 0.2 0.3 0.4 0.4 0.5 0.4 Transp wind dir.SW SW SW S SE SE S S S S S S Transp wind spd.14 14 6 6 7 9 12 14 14 13 13 14 Dispr kt-ft/1K..99 84 7 0 1 1 2 4 5 5 5 5 .THURSDAY... Sky/weather.........Partly sunny. CWR.................4 percent. Chance of pcpn......10 percent. Max temperature.....Around 54. Min humidity........43 percent. Wind (20 ft)........Northwest winds 7 to 16 mph increasing to around 17 mph with gusts to around 24 mph in the afternoon. Mixing height.......4300 ft AGL. Transport winds.....Northwest 14 to 15 mph increasing to 22 to 25 mph. Smoke dispersal.....Poor (4400 knot-ft) early in the morning increasing to good (86200 knot-ft) in the afternoon. TIME (MDT) 5AM 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM Sky (%).........35 34 34 39 44 45 46 47 51 56 60 69 Weather cov..... Weather type.... Tstm cov........ CWR.............0 0 0 0 0 0 0 0 0 0 0 0 Chc of pcpn (%).0 0 0 0 0 0 0 10 10 10 10 10 Temp............42 41 40 42 46 48 50 52 53 52 50 48 RH..............79 82 82 76 68 60 54 48 45 43 44 46 20 FT wind dir..NW NW W W W NW NW NW NW NW NW NW 20 FT wind spd..7 7 9 11 12 13 14 15 16 17 17 17 20 FT wind gust.10 10 11 13 15 18 20 21 22 24 24 24 Mix hgt (kft)...0.4 0.4 0.6 0.9 1.3 1.8 2.3 2.9 3.5 4.0 4.3 4.2 Transp wind dir.W NW NW N N N NW NW NW NW NW NW Transp wind spd.14 15 14 13 13 16 22 25 25 24 23 22 Dispr kt-ft/1K..4 5 7 9 14 25 43 64 78 86 86 81 $$ Forecaster...HEINERT Requested by...Dan Angelo Type of request...PRESCRIBED .TAG 2610368.0/BIS .DELDT 04/15/26 .FormatterVersion 2.0.0 .EMAIL daniel_angelo@nps.gov