001  
FNUS73 KGRR 241026  
FWSGRR  
 
SPOT FORECAST FOR SER UNIT 439...USFS HMF  
NATIONAL WEATHER SERVICE GRAND RAPIDS MI  
626 AM EDT THU MAY 24 2018  
 
FORECAST IS BASED ON IGNITION TIME OF 1000 EDT ON MAY 24.  
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
 
 
SUNNY AND WARMER WITH SOUTHWEST WINDS AROUND 10 TO 15 MPH THIS  
AFTERNOON. RELATIVE HUMIDITY WILL DROP TO ABOUT 35 PERCENT.  
   
REST OF TODAY
 
 
SKY/WEATHER.........SUNNY (10-20 PERCENT).  
TEMPERATURE.........69 AT IGNITION...MAX 81.  
RH..................63 PERCENT AT IGNITION...MIN 36 PERCENT.  
WIND (20 FT)........WINDS SOUTH AT 7 MPH AT IGNITION...OTHERWISE  
SOUTHWEST WINDS 6 TO 11 MPH.  
MIXING HEIGHT.......1700 FT AGL AT IGNITION...OTHERWISE 3300-3800  
FT AGL DECREASING TO 1200 FT AGL IN THE  
EVENING.  
MIXING WINDS........SOUTHWEST 9 TO 15 MPH.  
SMOKE DISPERSAL.....200 /FAIR/ AT IGNITION. MAX...600 /EXCELLENT/.  
HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH AT IGNITION...MAX 5.  
 
TIME (EDT) 10 AM NOON 2 PM 4 PM 6 PM 8 PM  
SKY (%).........12 13 14 14 16 20  
WEATHER COV.....  
WEATHER TYPE....NONE NONE NONE NONE NONE NONE  
TSTM COV........  
TEMP............69 79 80 81 80 76  
RH..............63 44 38 37 39 46  
20 FT WIND......S 7 SW 9 SW 11 SW 11 SW 9 S 7  
20 FT WIND GUST. 11 14 14 10  
MIX HGT (FT)....1700 3000 3800 3500 2100 400  
HAINES INDEX....5 5 5 5 5 4  
SMOKE DISPERSAL 200 400 500 500 300 0  
   
TONIGHT
 
 
SKY/WEATHER.........MOSTLY CLEAR (10-20 PERCENT).  
TEMPERATURE.........MIN 59.  
RH..................MAX 81 PERCENT.  
WIND (20 FT)........SOUTH WINDS 5 TO 10 MPH.  
MIXING HEIGHT.......0-400 FT AGL.  
MIXING WINDS........SOUTHWEST 5 TO 12 MPH.  
SMOKE DISPERSAL.....0 (POOR).  
HAINES INDEX........3 TO 4 OR OR VERY LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH TO OR LOW POTENTIAL FOR  
LARGE PLUME DOMINATED FIRE GROWTH.  
   
FRIDAY
 
 
SKY/WEATHER.........SUNNY (20-30 PERCENT).  
TEMPERATURE.........MAX 84.  
RH..................MIN 41 PERCENT.  
WIND (20 FT)........SOUTH WINDS 6 TO 11 MPH.  
MIXING HEIGHT.......2600-3100 FT AGL DECREASING TO 1100 FT AGL IN  
THE EVENING.  
MIXING WINDS........SOUTHWEST 13 TO 22 MPH.  
SMOKE DISPERSAL.....100-700 (POOR TO EXCELLENT).  
HAINES INDEX........2 TO 4 OR OR VERY LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH TO OR LOW POTENTIAL FOR  
LARGE PLUME DOMINATED FIRE GROWTH.  
 

 
FORECASTER...OSTUNO  
REQUESTED BY...KEVIN REESE  
TYPE OF REQUEST...PRESCRIBED  
.TAG 1810585.0/GRR  
.EMAIL KEVINREESE@FS.FS.US  
 
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