829  
FNUS73 KGRR 271228  
FWSGRR  
 
SPOT FORECAST FOR 458 SOUTH RX...USFS - HMF  
NATIONAL WEATHER SERVICE GRAND RAPIDS MI  
828 AM EDT TUE JUN 27 2017  
 
FORECAST IS BASED ON IGNITION TIME OF 1000 EDT ON JUNE 27.  
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
 
 
AN AREA OF HIGH PRESSURE IN THE MIDDLE MISSISSIPPI VALLEY WILL TRACK  
EAST TODAY INTO THE CENTRAL APPALACHIANS. THIS FEATURE WILL PROVIDE  
WESTERLY WINDS AND SUNNY SKIES ACROSS THE REGION TODAY. AFTERNOON  
HUMIDITY LEVELS ARE FORECASTED TO DROP OFF TO AROUND 40 PERCENT WITH  
GOOD MIXING EXPECTED THROUGH THE EARLY AFTERNOON HOURS.  
   
TODAY
 
 
SKY/WEATHER.........SUNNY (15-25 PERCENT).  
TEMPERATURE.........63 AT IGNITION...MAX 72.  
RH..................65 PERCENT AT IGNITION...MIN 41 PERCENT.  
WIND (20 FT)........WINDS WEST AT 10 MPH AT IGNITION...OTHERWISE  
WEST WINDS 6 TO 11 MPH.  
MIXING HEIGHT.......2300-2800 FT AGL INCREASING TO 4800 FT AGL AT  
IGNITION...OTHERWISE 7000-7500 FT AGL, THEN  
DECREASING TO 4300 FT AGL IN THE EVENING.  
MIXING WINDS........WEST 12 TO 20 MPH.  
SMOKE DISPERSAL.....800 /EXCELLENT/ AT IGNITION. MAX...1400  
/EXCELLENT/.  
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH AT IGNITION...MAX 4.  
 
TIME (EDT) 10 AM NOON 2 PM 4 PM 6 PM 8 PM  
SKY (%).........25 24 25 22 16 8  
WEATHER COV.....  
WEATHER TYPE....NONE NONE NONE NONE NONE NONE  
TSTM COV........  
TEMP............63 68 70 71 72 69  
RH..............65 53 45 42 41 47  
20 FT WIND......W 8 W 10 W 10 W 10 W 8 SW 7  
20 FT WIND GUST.15 20 20 20 15 10  
MIX HGT (FT)....4800 7200 7400 7400 5700 2900  
HAINES INDEX....3 4 4 4 4 3  
SMOKE DISPERSAL 800 1400 1300 1200 900 300  
   
TONIGHT
 
 
SKY/WEATHER.........MOSTLY CLEAR (10-20 PERCENT).  
TEMPERATURE.........MIN 54.  
RH..................MAX 90 PERCENT.  
WIND (20 FT)........SOUTH WINDS 5 TO 10 MPH.  
MIXING HEIGHT.......2400-2900 FT AGL DECREASING TO 400-900 FT AGL.  
MIXING WINDS........SOUTH 6 TO 12 MPH.  
SMOKE DISPERSAL.....0-300 (POOR TO GOOD).  
HAINES INDEX........3 TO 4 OR VERY LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH TO OR LOW POTENTIAL FOR  
LARGE PLUME DOMINATED FIRE GROWTH.  
   
WEDNESDAY
 
 
SKY/WEATHER.........MOSTLY SUNNY (40-50 PERCENT) THEN BECOMING  
MOSTLY CLOUDY (80-90 PERCENT). CHANCE OF  
SHOWERS AND THUNDERSTORMS IN THE AFTERNOON.  
TEMPERATURE.........MAX 76.  
RH..................MIN 46 PERCENT.  
WIND (20 FT)........SOUTH WINDS 12 TO 17 MPH. GUSTS UP TO 30 MPH.  
GUSTY AND ERRATIC WINDS EXPECTED NEAR  
THUNDERSTORMS IN THE AFTERNOON.  
MIXING HEIGHT.......3900-4400 FT AGL DECREASING TO 1900-2400 FT AGL  
LATE IN THE DAY.  
MIXING WINDS........SOUTH 14 TO 22 MPH INCREASING TO 24 TO 29 MPH.  
SMOKE DISPERSAL.....100-1300 (POOR TO EXCELLENT).  
HAINES INDEX........3 TO 4 OR VERY LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH TO OR LOW POTENTIAL FOR  
LARGE PLUME DOMINATED FIRE GROWTH.  
 

 
FORECASTER...MJS  
REQUESTED BY...KORY BORGMAN  
TYPE OF REQUEST...PRESCRIBED  
.TAG 1711704.0/GRR  
.EMAIL KBORGMAN@FS.FED.US  
 
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