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  
 
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