868  
FNUS73 KGRB 201352  
FWSGRB  
 
SPOT FORECAST FOR DONNER PILES RX...USFS  
NATIONAL WEATHER SERVICE GREEN BAY WI  
752 AM CST WED DEC 20 2017  
 
FORECAST IS BASED ON IGNITION TIME OF 1000 CST ON DECEMBER 20.  
IF CONDITIONS BECOME UNREPRESENTATIVE CONTACT THE NATIONAL WEATHER  
SERVICE IN GREEN BAY.  
   
DISCUSSION
 
 
GENERALLY LIGHT WINDS ARE EXPECTED TODAY AS A RIDGE OF HIGH PRESSURE  
SLIDES ACROSS WISCONSIN. DESPITE THE HIGH PRESSURE ACROSS THE REGION,  
CLOUDS WILL INCREASE TODAY AS A COMPLEX STORM SYSTEM BEGINS TO TAKE SHAPE  
OUT IN THE PLAINS. SNOW FROM THE STORM WILL OVERSPREAD THE AREA TONIGHT  
AND CONTINUE INTO THURSDAY.  
 
600 AM OBSERVED HAINES INDEX AT GREEN BAY...4 OR LOW.  
   
REST OF TODAY
 
 
SKY/WEATHER.........MOSTLY CLOUDY.  
TEMPERATURE.........16 AT IGNITION...MAX 22.  
RH..................77 PERCENT AT IGNITION...MIN 65 PERCENT.  
WIND (20 FT)........WINDS NORTHWEST AT 4 MPH AT  
IGNITION...OTHERWISE NORTHWEST WINDS 3 TO 6 MPH  
DURING THE MORNING BECOMING LIGHT AND VARIABLE.  
MIXING HEIGHT.......2200 FT AGL AT IGNITION...OTHERWISE 2600 FT  
AGL.  
TRANSPORT WINDS.....SOUTHWEST 2 TO 7 MPH.  
SMOKE DISPERSAL.....FAIR /19700 KNOT-FT/ AT IGNITION. MAX...POOR  
/4600 KNOT-FT/.  
 
TIME (CST) 10 AM NOON 2 PM 4 PM  
SKY COVER.......MCLDY MCLDY MCLDY MCLDY  
WEATHER COV.....  
WEATHER TYPE....NONE NONE NONE NONE  
TSTM COV........  
TEMP............16 20 22 21  
RH..............77 67 65 68  
20 FT WIND......NW 4 N 3 NW 2 SW 1  
20 FT WIND GUST.5 5 5 5  
MIX HGT (FT)....2200 2500 2600 2600  
TRANSPORT WIND..N 10 N 5 W 2 SW 1  
SDSPL KT-FT/100020 10 5 3  
   
TONIGHT
 
 
SKY/WEATHER.........CLOUDY. A CHANCE OF FLURRIES EARLY IN THE  
EVENING. A CHANCE OF LIGHT SNOW EARLY IN THE  
EVENING. CHANCE OF SNOW 50 PERCENT.  
TEMPERATURE.........MIN 15.  
RH..................MAX 96 PERCENT.  
WIND (20 FT)........LIGHT AND VARIABLE WIND.  
MIXING HEIGHT.......1300-1800 FT AGL.  
TRANSPORT WINDS.....SOUTHEAST 3 TO 8 MPH.  
SMOKE DISPERSAL.....POOR (6600 KNOT-FT).  
 
TIME (CST) 6 PM 8 PM 10 PM MIDNGT 2 AM 4 AM  
SKY COVER.......CLOUDY CLOUDY CLOUDY CLOUDY CLOUDY CLOUDY  
WEATHER COV..... S CHC S CHC CHANCE CHANCE CHANCE  
WEATHER TYPE....NONE SNOW SNOW SNOW SNOW SNOW  
TSTM COV........  
TEMP............17 16 16 16 17 16  
RH..............80 88 92 96 92 96  
20 FT WIND......SE 1 SE 2 SE 2 SE 2 E 2 E 1  
20 FT WIND GUST.5 5 5 5 5 5  
MIX HGT (FT)....2300 2200 2200 2100 1800 1300  
TRANSPORT WIND..S 1 S 3 SE 6 SE 8 S 8 S 6  
SDSPL KT-FT/10002 7 11 15 12 7  
   
THURSDAY
 
 
SKY/WEATHER.........CLOUDY. SNOW LIKELY. CHANCE OF SNOW 60 PERCENT.  
TEMPERATURE.........MAX 25.  
RH..................MIN 84 PERCENT.  
WIND (20 FT)........LIGHT AND VARIABLE WIND BECOMING NORTHEAST AT 3  
TO 7 MPH IN THE AFTERNOON.  
MIXING HEIGHT.......1600 FT AGL.  
TRANSPORT WINDS.....NORTHEAST 8 TO 13 MPH.  
SMOKE DISPERSAL.....FAIR (15000 KNOT-FT).  
 
TIME (CST) 6 AM 8 AM 10 AM NOON 2 PM 4 PM  
SKY COVER.......CLOUDY CLOUDY CLOUDY CLOUDY CLOUDY CLOUDY  
WEATHER COV.....LIKELY LIKELY LIKELY LIKELY LIKELY LIKELY  
WEATHER TYPE....SNOW SNOW SNOW SNOW SNOW SNOW  
TSTM COV........  
TEMP............16 19 21 24 25 23  
RH..............96 92 92 84 84 88  
20 FT WIND......E 1 E 2 NE 3 NE 4 NE 5 NE 5  
20 FT WIND GUST. 5 5 5  
MIX HGT (FT)....1000 900 1100 1300 1500 1600  
TRANSPORT WIND..E 3 NE 5 NE 7 E 9 E 10 NE 12  
SDSPL KT-FT/10003 4 7 11 14 16  
 

 
FORECASTER...SKOWRONSKI  
REQUESTED BY...ZACHARY PARMENTIER  
TYPE OF REQUEST...PRESCRIBED  
.TAG 1720121.0/GRB  
 
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