961  
FNUS73 KGRR 081258  
FWSGRR  
 
SPOT FORECAST FOR 418E RX...USFS  
NATIONAL WEATHER SERVICE GRAND RAPIDS MI  
858 AM EDT SAT JUN 8 2019  
 
FORECAST IS BASED ON IGNITION TIME OF 0900 EDT ON JUNE 08.  
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. CLOUDS WILL INCREASE TONIGHT WITH  
A CHANCE FOR SHOWERS DEVELOPING AFTER MIDNIGHT.  
   
DISCUSSION
 
 
THERE WILL BE A SMALL INCREASE IN HIGH CLOUDS TODAY, BUT OVERALL  
MOSTLY SUNNY SKIES ARE EXPECTED. IT WILL BE DRY TODAY. AN INCREASE  
IN CLOUD COVER WILL OCCUR TONIGHT WITH A CHANCE OF RAIN SHOWERS  
AFTER MIDNIGHT. RAIN IS LIKELY ON SUNDAY AS AREAS OF LOW PRESSURE  
CONVERGE ON THE GREAT LAKES REGION.  
 
A STEADY WIND OUT OF THE EAST IS FORECAST TODAY AT 10 TO 20 MPH  
THROUGH THE ENTIRE DAY. GIVEN THE STRENGTH OF THE EAST WIND, WE  
SHOULD NOT SEE ANY LAKE BREEZE AFFECT THE FIRE LOCATION, WHICH  
TYPICALLY OCCURS IN THIS AREA.  
 
HIGH TEMPERATURES WILL TOP OUT IN THE MIDDLE 80S WITH MINIMUM RH  
VALUES DIPPING TOWARDS 30 PERCENT THIS AFTERNOON.  
   
TODAY
 
 
SKY/WEATHER.........SUNNY (20-30 PERCENT).  
TEMPERATURE.........68 AT IGNITION...MAX 85.  
RH..................52 PERCENT AT IGNITION...MIN 32 PERCENT.  
WIND (20 FT)........WINDS EAST AT 11 MPH AT IGNITION...OTHERWISE  
EAST WINDS 10 TO 18 MPH.  
MIXING HEIGHT.......700 FT AGL AT IGNITION...OTHERWISE 5200 FT AGL.  
MIXING WINDS........EAST 7 TO 15 MPH INCREASING TO 15 TO 25 MPH  
LATE IN THE MORNING.  
SMOKE DISPERSAL.....100 /POOR/ AT IGNITION. MAX...1000 /EXCELLENT/.  
HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED  
FIRE GROWTH AT IGNITION...MAX 6.  
 
TIME (EDT) 9 AM 11 AM 1 PM 3 PM 5 PM 7 PM  
SKY (%).........11 23 34 43 49 55  
WEATHER COV.....  
WEATHER TYPE....NONE NONE NONE NONE NONE NONE  
TSTM COV........  
TEMP............68 76 80 84 85 82  
RH..............52 43 36 33 32 35  
20 FT WIND......E 9 E 9 E 11 E 12 E 12 E 11  
20 FT WIND GUST. 14 16 20 20 15  
MIX HGT (FT)....700 2500 4300 5200 4700 1600  
HAINES INDEX....4 5 6 6 5 5  
SMOKE DISPERSAL 100 500 800 1000 900 200  
   
TONIGHT
 
 
SKY/WEATHER.........PARTLY CLOUDY (55-65 PERCENT) THEN BECOMING  
MOSTLY CLOUDY (70-80 PERCENT). CHANCE OF  
SHOWERS OVERNIGHT.  
TEMPERATURE.........MIN 61.  
RH..................MAX 81 PERCENT.  
WIND (20 FT)........EAST WINDS 6 TO 11 MPH.  
MIXING HEIGHT.......2800 FT AGL.  
MIXING WINDS........EAST 7 TO 15 MPH.  
SMOKE DISPERSAL.....0-500 (POOR TO GOOD).  
HAINES INDEX........2 TO 5 OR VERY LOW TO MODERATE POTENTIAL FOR  
LARGE PLUME DOMINATED FIRE GROWTH.  
   
SUNDAY
 
 
SKY/WEATHER.........MOSTLY CLOUDY (80-90 PERCENT). CHANCE OF  
SHOWERS EARLY IN THE MORNING, THEN SHOWERS  
LIKELY AND A SLIGHT CHANCE OF THUNDERSTORMS  
EARLY IN THE MORNING.  
TEMPERATURE.........MAX 74.  
RH..................MIN 66 PERCENT.  
WIND (20 FT)........EAST WINDS 5 TO 10 MPH. GUSTY AND ERRATIC WINDS  
EXPECTED NEAR THUNDERSTORMS EARLY IN THE  
MORNING.  
MIXING HEIGHT.......700 FT AGL.  
MIXING WINDS........EAST 7 TO 10 MPH.  
SMOKE DISPERSAL.....0-100 (POOR).  
HAINES INDEX........2 OR VERY LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
 

 
FORECASTER...DUKE  
REQUESTED BY...BEN WAGNER  
TYPE OF REQUEST...PRESCRIBED  
.TAG 1910561.1/GRR  
.DELDT 06/08/19  
.FORMATTERVERSION 1.0.26  
.EMAIL BEN.WAGNER@USDA.GOV  
 
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