FNUS73 KFGF 191405 FWSFGF Spot Forecast for Gruhl WMA Rx Burn...Minnesota Department of Natural Resources National Weather Service Grand Forks ND 905 AM CDT Tue May 19 2026 Forecast is based on ignition time of 0900 CDT on May 20. If conditions become unrepresentative, contact the National Weather Service. Please call the NWS in Grand Forks at 701-795-5127 for additional information and monitor our website (www.weather.gov/fgf) or NOAA All-Hazards Radio for the latest updates. .DISCUSSION... The mostly cloudy skies and lingering light drizzle that will impact the burn site today will clear out tonight, leaving mostly sunny skies tomorrow. Some frost is possible early in the morning, but afternoon temperatures should climb into the 60s. Light and somewhat variable winds in the early morning should steady out of the south by ignition time at 5 to 10 mph. Some gusts up to 20 mph will be possible by late afternoon. Afternoon RH values are expected to fall into the 35 to 40 percent range. Winds will remain south to southeasterly through Wednesday night and into Thursday, picking up in speed with sustained winds 15 to 20 mph and gusts up above 25 mph by Thursday afternoon. Temperatures will be a bit warmer and RH values slightly lower for Thursday. .WEDNESDAY... Sky/weather.........Sunny (20-30 percent). Widespread frost early in the morning, then areas of frost early in the morning. Max temperature.....Around 63. Min humidity........39 percent. Wind (20 ft)........South winds 5 to 10 mph. Gusts up to 21 mph late in the afternoon. Mixing height.......5300 ft AGL. Mixing winds........South 10 to 15 mph. Smoke dispersal.....2500 knot-ft early in the morning increasing to 68600 knot-ft in the afternoon. TIME (CDT) 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM Sky (%).........7 7 10 6 22 14 14 8 7 Weather cov..... Weather type.... Tstm cov........ Temp............44 51 53 56 57 60 61 61 63 RH..............73 56 52 49 47 42 41 41 39 20 FT wind dir..S S S S S S S S S 20 FT wind spd..5 10 10 10 10 10 10 10 10 20 FT wind gust.11 13 14 14 15 16 18 19 19 Mix hgt (kft)...2.0 3.0 3.6 4.3 4.6 4.8 5.2 5.2 5.3 Mixing wind dir.S S S S S S S S S Mixing wind spd.10 10 10 10 15 15 15 15 15 Vrate kt-ft/1K..18 27 33 43 50 57 67 68 69 .WEDNESDAY NIGHT... Sky/weather.........Mostly clear (20-30 percent). Min temperature.....Around 44. Max humidity........73 percent. Wind (20 ft)........South winds 10 to 15 mph. Gusts up to 21 mph early in the evening then 28 mph in the late evening and overnight. Mixing height.......500 ft AGL. Mixing winds........South 15 to 20 mph. Smoke dispersal.....72200 knot-ft early in the evening decreasing to 6500 knot-ft late in the night. TIME (CDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM Sky (%).........20 13 13 21 29 27 26 24 25 27 28 32 Weather cov..... Weather type.... Tstm cov........ Temp............61 61 60 56 52 50 49 48 47 46 45 45 RH..............41 42 46 51 56 58 61 63 65 71 73 73 20 FT wind dir..S S S S SE SE S S S S S S 20 FT wind spd..10 10 10 10 10 15 15 15 15 15 15 15 20 FT wind gust.19 19 16 16 19 21 23 23 25 25 25 25 Mix hgt (kft)...5.2 4.4 1.0 0.7 0.5 0.5 0.6 0.6 0.6 0.7 0.7 0.7 Mixing wind dir.S S S S SE SES S S S S S Mixing wind spd.15 15 15 15 15 15 15 20 20 20 20 20 Vrate kt-ft/1K..72 61 11 9 7 8 9 10 10 11 12 12 .THURSDAY... Sky/weather.........Mostly sunny (30-40 percent). Max temperature.....Around 68. Min humidity........37 percent. Wind (20 ft)........South winds 15 to 20 mph. Mixing height.......7000 ft AGL. Mixing winds........South 15 to 20 mph. Smoke dispersal.....11600 knot-ft early in the morning increasing to 109600 knot-ft in the afternoon increasing to (107900 knot-ft) late in the afternoon. TIME (CDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM Sky (%).........37 41 35 29 23 24 26 27 31 36 40 42 Weather cov..... Weather type.... Tstm cov........ Temp............46 47 50 54 58 61 63 65 66 67 67 67 RH..............73 71 66 59 53 48 44 41 40 37 37 37 20 FT wind dir..S S S S S S S S S S S S 20 FT wind spd..15 15 15 15 20 20 20 20 20 20 20 20 20 FT wind gust.23 23 23 23 25 26 27 27 27 27 26 25 Mix hgt (kft)...0.8 0.8 1.6 2.3 3.1 4.0 4.8 5.6 6.1 6.5 7.0 6.1 Mixing wind dir.S S S S S S S S S S S S Mixing wind spd.15 15 20 20 20 20 20 20 20 20 20 20 Vrate kt-ft/1K..12 12 25 40 56 71 86 102 110 118 126 108 $$ Forecaster...JR Requested by...Greg Henderson Type of request...PRESCRIBED .TAG 2614023.0/FGF .DELDT 05/19/26 .FormatterVersion 2.0.0 .EMAIL greg.henderson@state.mn.us