Spot Forecast
Issued by NWS Grand Rapids, MI
Issued by NWS Grand Rapids, MI
109 FNUS73 KGRR 181546 FWSGRR Spot Forecast for Range 7 burn...MDMVA National Weather Service Grand Rapids MI 1146 AM EDT Wed Sep 18 2024 Forecast is based on ignition time of 1200 EDT on September 18. 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... Dry conditions are expected with light easterly winds becoming more southeasterly later this afternoon. Minimum relative humidity values are expected to be mainly in the 40s but if we are able to mix a little more this afternoon they could drop into the mid to upper 30s. .REST OF TODAY... Sky/weather.........Mostly sunny (30-40 percent). Temperature.........72 at ignition...Max 84. RH..................73 percent at ignition...Min 43 percent. Wind (20 ft)........Winds east at 3 mph at ignition...otherwise Light winds becoming east 5 to 6 mph in the afternoon. Mixing height.......2800 ft AGL at ignition...otherwise 5900 ft AGL. Mixing winds........Southeast 3 to 6 mph. Smoke dispersal.....130 /fair/ at ignition. Max...340 /good/. Haines Index........5 or moderate potential for large plume dominated fire growth at ignition...max 5. TIME (EDT) NOON 2 PM 4 PM 6 PM 8 PM 10 PM Sky (%).........34 22 40 38 26 13 Weather cov..... Weather type....NONE NONE NONE NONE NONE NONE Tstm cov........ Temp............72 78 83 82 74 67 RH..............73 56 44 46 62 78 20 ft wind......E 3 E 6 E 6 E 6 E 5 E 5 20 ft wind gust.8 10 9 9 7 8 Mix hgt (ft)....2800 4800 5800 5300 500 400 Mixing wind.....E 5 SE 6 SE 6 SE 6 E 6 E 8 Haines index....5 5 5 5 4 4 Smoke disprsl...130 270 330 300 30 30 .TONIGHT... Sky/weather.........Mostly clear (10-20 percent). Patchy fog overnight. Temperature.........Min 55. RH..................Max 100 percent. Wind (20 ft)........East winds around 5 mph until midnight becoming light. Mixing height.......400 ft AGL. Mixing winds........Southeast 6 to 9 mph. Smoke dispersal.....30 (poor). Haines Index........4 or low potential for large plume dominated fire growth. .THURSDAY... Sky/weather.........Sunny (5-15 percent). Temperature.........Max 85. RH..................Min 40 percent. Wind (20 ft)........Light winds becoming east around 5 mph through mid afternoon, then becoming light late in the day. Mixing height.......6000 ft AGL. Mixing winds........East 5 to 7 mph. Smoke dispersal.....20 (poor) early in the morning increasing to 260 (fair) in the afternoon. Haines Index........5 or moderate potential for large plume dominated fire growth. $$ Forecaster...Hansen Requested by...Michele Richards Type of request...PRESCRIBED .TAG 2422672.0/GRR .DELDT 09/18/24 .FormatterVersion 2.0.0 .EMAIL richardsm2@michigan.gov