201  
FNUS73 KFGF 111617  
FWSFGF  
 
SPOT FORECAST FOR UNIT #18 SPENCE RX...BIA  
NATIONAL WEATHER SERVICE GRAND FORKS ND  
1117 AM CDT SUN APR 11 2021  
 
FORECAST IS BASED ON IGNITION TIME OF 1200 CDT ON APRIL 11.  
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL  
WEATHER SERVICE.  
 
PLEASE CALL THE NWS IN GRAND FORKS AT 701-795-5127 FOR ADDITIONAL  
INFORMATION AND MONITOR OUR WEBSITE (WWW.WEATHER.GOV/FGF) OR NOAA  
ALL-HAZARDS RADIO FOR THE LATEST UPDATES.  
   
DISCUSSION
 
 
CLOUD COVER WITH COOL TEMPERATURES IN THE 40S IS EXPECTED TODAY  
WITH WEAK AFTERNOON WINDS FROM THE NORTHEAST BETWEEN 5 AND 10  
MILES PER HOUR. RAIN AND SNOW IS EXPECTED TO INCREASE WITH  
STRONGER WINDS FROM THE NORTHWEST ARE EXPECTED TOMORROW.  
   
REST OF TODAY
 
 
SKY/WEATHER.........CLOUDY.  
MAX TEMPERATURE.....46-51.  
MIN HUMIDITY........63 PERCENT.  
WIND (20 FT)........NORTHEAST WINDS 5 TO 7 MPH.  
MIXING HEIGHT.......2700-3500 FT AGL.  
MIXING WINDS........NORTHEAST 13 TO 14 MPH.  
SMOKE DISPERSAL.....FAIR TO GOOD (25800-44800 KNOT-FT).  
 
TIME (CDT) 12P 1PM 2PM 3PM 4PM 5PM 6PM  
SKY (%).........89 97 98 99 100 100 100  
WEATHER COV.....  
WEATHER TYPE....  
TSTM COV........  
TEMP............43 44 45 46 46 46 46  
RH..............73 73 69 63 63 63 63  
20 FT WIND DIR..NE NE NE NE NE NE NE  
20 FT WIND SPD..7 6 6 6 6 6 6  
20 FT WIND GUST.13 13 13 13 13 13 13  
MIX HGT (KFT)...3.5 2.7 2.7 2.7 2.7 2.7 2.7  
MIXING WIND DIR.NE NE NE NE NE NE NE  
MIXING WIND SPD.13 14 14 14 14 14 14  
VRATE KT-FT/100039 45 45 45 45 45 45  
   
TONIGHT
 
 
SKY/WEATHER.........CLOUDY. CHANCE OF RAIN SHOWERS LATE IN THE  
EVENING. RAIN SHOWERS LIKELY AFTER MIDNIGHT.  
MIN TEMPERATURE.....32-37.  
MAX HUMIDITY........79 PERCENT.  
WIND (20 FT)........NORTH WINDS 5 TO 6 MPH.  
MIXING HEIGHT.......2100-2200 FT AGL.  
MIXING WINDS........NORTHEAST 13 TO 15 MPH.  
SMOKE DISPERSAL.....FAIR (22200 KNOT-FT).  
 
TIME (CDT) 7 PM 9 PM 11 PM 1 AM 3 AM 5 AM  
SKY (%).........100 100 100 99 100 100  
WEATHER COV..... CHANCE CHANCE LIKELY LIKELY  
WEATHER TYPE....NONE NONE RNSHWR RNSHWR RNSHWR RNSHWR  
TSTM COV........  
TEMP............45 42 40 40 39 38  
RH..............62 70 76 79 79 76  
20 FT WIND......NE 5 NE 5 NE 5 N 6 N 6 N 6  
20 FT WIND GUST.12 12 12 12 12 12  
MIX HGT (FT)....2200 2200 2200 2100 2100 2100  
MIXING WIND.....NE 13 NE 13 NE 13 N 15 N 15 N 15  
VRATE KT-FT/100028 28 28 29 29 29  
   
MONDAY
 
 
SKY/WEATHER.........CLOUDY. SNOW IN THE MORNING. RAIN. SNOW IN THE  
AFTERNOON.  
MAX TEMPERATURE.....37-42.  
MIN HUMIDITY........77 PERCENT.  
WIND (20 FT)........NORTHWEST WINDS 6 TO 11 MPH. GUSTS UP TO 21 MPH  
IN THE AFTERNOON.  
MIXING HEIGHT.......2100-2900 FT AGL.  
MIXING WINDS........NORTHWEST 18 TO 21 MPH.  
SMOKE DISPERSAL.....FAIR TO GOOD (27800-54000 KNOT-FT).  
 
TIME (CDT) 7 AM 10 AM 1 PM 4 PM  
SKY (%).........87 88 87 87  
WEATHER COV.....DEFNTE DEFNTE DEFNTE DEFNTE  
WEATHER TYPE....RNSN RNSN RAIN RNSN  
TSTM COV........  
TEMP............36 36 37 36  
RH..............79 79 77 82  
20 FT WIND......NW 10G16 NW 10G16 NW 11G19 NW 11G19  
MIX HGT (FT)....2100 2100 2900 2900  
MIXING WIND.....N 18 N 18 NW 21 NW 21  
VRATE KT-FT/100042 42 54 54  
   
MONDAY NIGHT
 
 
SKY/WEATHER.........MOSTLY CLOUDY. SNOW LIKELY.  
MIN TEMPERATURE.....25-30.  
MAX HUMIDITY........87 PERCENT.  
WIND (20 FT)........NORTHWEST WINDS 6 TO 11 MPH. GUSTS UP TO 20 MPH  
IN THE EVENING.  
MIXING HEIGHT.......2300 FT AGL.  
MIXING WINDS........NORTHWEST 23 TO 24 MPH.  
SMOKE DISPERSAL.....GOOD (43800 KNOT-FT).  
 

 
FORECASTER...PERROUX  
REQUESTED BY...TERRANCE SNETSINGER  
TYPE OF REQUEST...PRESCRIBED  
.TAG 2108583.0/FGF  
.DELDT 04/11/21  
.EMAIL TERRANCE.SNETSINGER@BIA.GOV  
 
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