FNUS73 KARX 201513 FWSARX Spot Forecast for Fort McCoy 100 Range...USDA FS National Weather Service La Crosse WI 1013 AM CDT Mon Apr 20 2026 Forecast is based on ignition time of 1200 CDT on April 20. If conditions become unrepresentative...contact the National Weather Service. Please contact our office at (608) 784-8292 if you have questions or concerns with this forecast. .DISCUSSION... Dry conditions are expected throughout the afternoon hours under mostly clear skies with no precipitation forecast. Mixing heights will reach 4.5kft this afternoon, peaking around ignition time through 4pm resulting in minimum RHs bottoming out around 25 percent. There is some potential (30-40%) to fall into the 20 to 25 percent range, but the potential to fall below 20 percent is very low (<5%). Winds will be from the south around 5-10 mph although some southerly gusts of 15 mph may be observed between 1pm-7pm before falling off and becoming light overnight. RH recovery overnight will be very efficient as they climb above 80 percent. .REST OF TODAY... Sky/weather.........Mostly sunny (30-40 percent). CWR.................0 percent. Chance of thunder...0 percent. Temperature.........49 at ignition...Max 57. RH..................30 percent at ignition...Min 26 percent. Wind (20 ft)........Winds south at 7 mph at ignition...otherwise South winds 7 to 10 mph. Mixing height.......4500 ft AGL at ignition...otherwise 4600 ft AGL. Transport winds.....South 12 to 18 mph. Smoke dispersal.....Good /45100 knot-ft/ at ignition. Max...excellent /64300 knot-ft/. TIME (CDT) 12P 1PM 2PM 3PM 4PM 5PM Sky (%).........24 23 22 26 50 48 Weather cov..... Weather type.... Tstm cov........ CWR.............0 0 0 0 0 0 Chc of thdr (%).0 0 0 0 0 0 Temp............49 51 54 55 55 56 RH..............30 28 26 26 29 28 20 FT wind dir..S SW SW S S S 20 FT wind spd..7 8 9 9 10 10 20 FT wind gust.13 14 14 15 15 16 Mix hgt (kft)...4.5 4.6 4.6 4.5 4.2 3.9 Transp wind dir.SW S S S S S Transp wind spd.12 14 16 16 17 18 SDspl kt-ft/100045 55 64 63 63 62 .TONIGHT... Sky/weather.........Mostly cloudy (50-60 percent) then becoming partly cloudy (40-50 percent) then becoming mostly cloudy (60-70 percent) then becoming partly cloudy (30-40 percent). CWR.................0 percent. Chance of thunder...0 percent. Temperature.........Min 42. RH..................Max 82 percent. Wind (20 ft)........South winds 5 to 9 mph with gusts to around 19 mph in the evening and overnight becoming light. Mixing height.......1200 ft AGL decreasing to 600 ft AGL early in the evening. Transport winds.....South 12 to 18 mph. Smoke dispersal.....Good (48600 knot-ft) early in the evening decreasing to poor (5500 knot-ft) late in the night. TIME (CDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM Sky (%).........57 46 46 56 69 69 63 47 35 28 25 20 Weather cov..... Weather type.... Tstm cov........ CWR.............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............56 53 50 47 46 46 45 45 45 45 44 44 RH..............32 36 42 51 60 63 65 65 70 73 73 82 20 FT wind dir..S S S S S S S S S S S S 20 FT wind spd..9 8 7 6 6 5 5 5 5 4 4 3 20 FT wind gust.19 16 15 14 14 14 14 15 14 14 13 11 Mix hgt (kft)...3.0 1.2 0.9 1.0 1.0 0.9 0.8 0.8 0.8 0.7 0.6 0.6 Transp wind dir.S S S S S S S S S S SW S Transp wind spd.18 16 14 15 15 15 16 16 14 12 12 12 SDspl kt-ft/100049 16 10 13 14 12 12 12 9 7 6 6 .TUESDAY... Sky/weather.........Sunny (5-15 percent). CWR.................0 percent. Chance of thunder...2 percent. Temperature.........Max 74. RH..................Min 40 percent. Wind (20 ft)........Light winds becoming northwest around 5 mph late in the afternoon. Mixing height.......2200 ft AGL increasing to 4600 ft AGL in the afternoon. Transport winds.....Southwest around 10 mph shifting to the northwest 7 to 12 mph in the late morning and afternoon. Smoke dispersal.....Poor (4200 knot-ft) early in the morning increasing to good (41100 knot-ft) in the afternoon. TIME (CDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM Sky (%).........19 17 18 14 7 6 6 6 5 9 7 4 Weather cov..... Weather type.... Tstm cov........ CWR.............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............44 45 49 55 60 65 68 70 72 72 73 72 RH..............82 82 80 69 62 54 51 46 43 40 40 43 20 FT wind dir..S S SW W W NW NW NW NW NW NW NW 20 FT wind spd..3 3 3 4 3 3 3 3 4 5 5 5 20 FT wind gust.11 9 8 8 8 8 8 7 9 9 9 9 Mix hgt (kft)...0.5 0.5 0.7 1.1 1.6 2.2 2.7 3.1 3.6 4.1 4.6 3.2 Transp wind dir.S SW SW W W NW NW NW NW NW NW NW Transp wind spd.10 10 10 12 8 7 7 7 8 9 10 10 SDspl kt-ft/10004 4 7 11 11 13 16 19 25 33 41 29 $$ Forecaster...NF Requested by...Chris Owens Type of request...PRESCRIBED .TAG 2610867.0/ARX .DELDT 04/20/26 .FormatterVersion 2.0.0 .EMAIL christopher.owens@usda.gov