524
FNUS73 KGRR 151435
FWSGRR

Spot Forecast for Cornish RX...MI DNR
National Weather Service Grand Rapids MI
1035 AM EDT Wed Oct 15 2025

Forecast is based on ignition time of 1100 EDT on October 16.
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...

HIgh pressure over the area will result in sunny skies and light
east to southeast winds around 5 to 10 mph. Relative humidity
values will fall into the 30s during the afternoon with mixing
heights around 3500 feet.

.THURSDAY...

Sky/weather.........Sunny (0-10 percent).
Temperature.........55 at ignition...Max 65.
RH..................64 percent at ignition...Min 41 percent.
Wind (20 ft)........Winds east at 5 mph at ignition...otherwise
                    East winds 5 to 6 mph.
Mixing height.......1200 ft AGL at ignition...otherwise 3500 ft
                    AGL.
Mixing winds........East 3 to 8 mph.
Smoke dispersal.....90 /poor/ at ignition. Max...150 /fair/.

TIME (EDT)      7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM 6PM
Sky (%).........2   5   5   5   5   5   5   6   8   9   11  13
Weather cov.....
Weather type....
Tstm cov........
Temp............55  58  61  63  64  65  65  63  60  57  54  51
RH..............64  55  50  48  46  43  41  44  51  57  64  71
20 FT wind dir..E   E   E   E   E   E   E   E   E   E   E   SE
20 FT wind spd..5   5   6   6   6   5   5   5   3   3   3   3
20 FT wind gust.12  13  13  13  13  12  12  10  9   8   8   8
Mix hgt (kft)...1.2 2.0 2.6 3.0 3.4 3.5 3.2 2.3 1.2 0.2 0.1 0.2
Mixing wind dir.SE  SE  SE  E   E   E   E   E   E   E   E   SE
Mixing wind spd.8   7   6   5   3   3   3   3   3   5   6   8
Smoke disprsl...90  140 150 140 130 120 110 80  40  10  0   10

.THURSDAY NIGHT...

Sky/weather.........Mostly clear (15-25 percent). Slight chance of
                    rain showers overnight.
Temperature.........Min 45.
RH..................Max 74 percent.
Wind (20 ft)........East winds around 5 mph early in the evening
                    becoming light, then becoming southeast 5 to 6
                    mph overnight.
Mixing height.......0 ft AGL.
Mixing winds........Southeast 3 to 10 mph shifting to the south 10
                    to 13 mph overnight.
Smoke dispersal.....0 (poor).

.FRIDAY...

Sky/weather.........Partly sunny (55-65 percent). Slight chance of
                    rain showers early in the morning. Slight
                    chance of rain showers late in the afternoon.
Temperature.........Max 68.
RH..................Min 40 percent.
Wind (20 ft)........South winds 6 to 9 mph. Gusts up to 21 mph late
                    in the afternoon.
Mixing height.......2900 ft AGL.
Mixing winds........South 14 to 16 mph.
Smoke dispersal.....40 (poor) early in the morning increasing to
                    480 (good) in the afternoon.

$$
Forecaster...Hansen
Requested by...650
Type of request...PRESCRIBED
.TAG 2523651.0/GRR
.DELDT 10/15/25
.FormatterVersion 2.0.0
.EMAIL corserj@michigan.gov