359  
FNUS73 KGRR 141150  
FWSGRR  
 
SPOT FORECAST FOR POWERLINE RX...USFS  
NATIONAL WEATHER SERVICE GRAND RAPIDS MI  
750 AM EDT THU JUN 14 2018  
 
FORECAST IS BASED ON IGNITION TIME OF 1000 EDT ON JUNE 14.  
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 WILL PROVIDE SUNNY AND WARM CONDITIONS  
TODAY WITH LOW HUMIDITY LEVELS. MIN RH VALUES LATER IN THE DAY WILL  
FALL TO AROUND 25 PERCENT.  
   
REST OF TODAY
 
 
SKY/WEATHER.........SUNNY (5-15 PERCENT).  
TEMPERATURE.........72 AT IGNITION...MAX 84.  
RH..................49 PERCENT AT IGNITION...MIN 27 PERCENT.  
WIND (20 FT)........WINDS NORTHWEST AT 6 MPH AT  
IGNITION...OTHERWISE WEST WINDS 5 TO 10 MPH.  
MIXING HEIGHT.......2500 FT AGL AT IGNITION...OTHERWISE 7100-7600  
FT AGL.  
MIXING WINDS........NORTHWEST 8 TO 10 MPH.  
SMOKE DISPERSAL.....200 /FAIR/ AT IGNITION. MAX...700 /EXCELLENT/.  
HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH AT IGNITION...MAX 6.  
 
TIME (EDT) 10 AM NOON 2 PM 4 PM 6 PM 8 PM  
SKY (%).........7 5 8 10 12 10  
WEATHER COV.....  
WEATHER TYPE....NONE NONE NONE NONE NONE NONE  
TSTM COV........  
TEMP............72 81 84 83 81 77  
RH..............49 35 29 30 33 40  
20 FT WIND......NW 6 NW 8 W 9 W 9 W 9 W 7  
20 FT WIND GUST.  
MIX HGT (FT)....2500 5400 7300 7200 4400 600  
HAINES INDEX....5 5 6 6 5 5  
SMOKE DISPERSAL 200 600 700 700 300 0  
   
TONIGHT
 
 
SKY/WEATHER.........MOSTLY CLEAR (5-15 PERCENT).  
TEMPERATURE.........MIN 55.  
RH..................MAX 86 PERCENT.  
WIND (20 FT)........NORTHWEST WINDS 5 TO 8 MPH IN THE EVENING  
BECOMING LIGHT, THEN BECOMING EAST 5 TO 8 MPH  
AFTER MIDNIGHT.  
MIXING HEIGHT.......4400 FT AGL DECREASING TO 0-100 FT AGL.  
MIXING WINDS........NORTH 1 TO 7 MPH SHIFTING TO THE EAST 2 TO 5  
MPH AFTER MIDNIGHT.  
SMOKE DISPERSAL.....0-300 (POOR TO GOOD).  
HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
   
FRIDAY
 
 
SKY/WEATHER.........PARTLY SUNNY (60 PERCENT). SLIGHT CHANCE OF  
RAIN SHOWERS.  
TEMPERATURE.........MAX 83.  
RH..................MIN 41 PERCENT.  
WIND (20 FT)........SOUTH WINDS 5 TO 10 MPH.  
MIXING HEIGHT.......2100-2600 FT AGL.  
MIXING WINDS........SOUTHEAST 5 TO 12 MPH.  
SMOKE DISPERSAL.....0-200 (POOR TO FAIR).  
HAINES INDEX........3 TO 5 OR OR VERY LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH TO OR MODERATE POTENTIAL  
FOR LARGE PLUME DOMINATED FIRE GROWTH.  
 

 
FORECASTER...MEADE  
REQUESTED BY...KORY BORGMAN  
TYPE OF REQUEST...PRESCRIBED  
.TAG 1811440.0/GRR  
.DELDT 06/14/18  
.EMAIL KBORGMAN@FS.FED.US  
 
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