FNUS73 KGRR 040941 FWSGRR Spot Forecast for Railroad...USFS National Weather Service Grand Rapids MI 541 AM EDT Mon May 4 2026 Forecast is based on ignition time of 1000 EDT on May 04. If conditions become unrepresentative, contact the National Weather Service. Please contact our office at (616) 949-5150, if you have questions or concerns with this forecast. .DISCUSSION... Southwest wind pick up this morning with gusts to 25 mph increasing to around 35 mph this afternoon. Relative humidity values will be dropping into the afternoon to around 35 percent. There is a 20 percent chance that values could drop below 30 this afternoon. Rain and thunderstorms are expected to hold off until 5 to 7pm. Thunderstorms may contain stronger winds gusts. .REST OF TODAY... Sky/weather.........Mostly sunny (35-45 percent) then becoming mostly cloudy (70-80 percent). Chance of rain showers and slight chance of thunderstorms late in the afternoon. Temperature.........57 at ignition...Max 72. RH..................55 percent at ignition...Min 35 percent. Wind (20 ft)........Winds south at 12 mph at ignition...otherwise Southwest winds 12 to 18 mph. Gusts up to 33 mph increasing to 36 mph late in the afternoon. Gusty and erratic winds expected near thunderstorms late in the afternoon. Mixing height.......900 ft AGL at ignition...otherwise 2200 ft AGL. Mixing winds........Southwest 20 to 28 mph increasing to 25 to 31 mph late in the afternoon. Smoke dispersal.....180 /fair/ at ignition. Max...680 /excellent/. TIME (EDT) 10A 11A 12P 1PM 2PM 3PM 4PM 5PM 6PM 7PM 8PM 9PM Sky (%).........15 19 20 18 31 47 61 76 82 89 81 77 Weather cov..... CHC CHC CHC CHC CHC Weather type.... RW RW RW RW RW Tstm cov........ SCH SCH SCH SCH SCH Temp............57 63 67 69 69 68 69 69 67 64 61 57 RH..............55 44 39 35 35 37 37 40 47 54 60 67 20 FT wind dir..S SW SW SW SW SW SW SW SW SW SW W 20 FT wind spd..12 14 16 17 18 18 17 16 14 12 9 7 20 FT wind gust.24 30 32 33 35 36 35 33 31 28 23 18 Mix hgt (kft)...0.9 1.3 1.4 1.8 1.9 2.2 1.8 1.2 1.2 0.7 0.5 0.5 Mixing wind dir.SW SW SW SW SW SW SW SW SW SW SW W Mixing wind spd.20 22 24 28 30 31 28 25 24 21 16 14 Smoke disprsl...180 280 340 490 580 680 500 310 280 150 80 60 .TONIGHT... Sky/weather.........Mostly cloudy (65-75 percent). Chance of rain showers and slight chance of thunderstorms in the evening, then slight chance of rain showers late in the evening. Temperature.........Min 41. RH..................Max 79 percent. Wind (20 ft)........Southwest winds 9 to 14 mph with gusts to around 31 mph shifting to the northwest 5 to 6 mph overnight. Gusty and erratic winds expected near thunderstorms in the evening. Mixing height.......400 ft AGL. Mixing winds........Southwest 16 to 24 mph shifting to the west 10 to 14 mph late in the evening, then shifting to the northwest 13 to 14 mph late in the evening shifting to the north 6 to 14 mph overnight. Smoke dispersal.....280 (fair) early in the evening decreasing to 20 (poor) late in the night. .TUESDAY... Sky/weather.........Mostly sunny (45-55 percent). Temperature.........Max 54. RH..................Min 39 percent. Wind (20 ft)........Northwest winds 5 to 7 mph. Mixing height.......4500 ft AGL. Mixing winds........Northwest 6 to 15 mph shifting to the west 16 to 18 mph late in the morning. Smoke dispersal.....20 (poor) early in the morning increasing to 820 (excellent) in the afternoon. $$ Forecaster...Hansen Requested by...Brandon Kelley Type of request...PRESCRIBED .TAG 2612571.0/GRR .DELDT 05/04/26 .FormatterVersion 2.0.0 .EMAIL brandon.kelley@usda.gov