475  
FNUS73 KGID 201110  
FWSGID  
 
SPOT FORECAST FOR PRD BURN...TRI-BASIN NRD  
NATIONAL WEATHER SERVICE HASTINGS NE  
610 AM CDT MON APR 20 2020  
 
FORECAST IS BASED ON IGNITION TIME OF 0900 CDT ON APRIL 20.  
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER  
SERVICE.  
 
...RED FLAG WARNING IN EFFECT FROM 1 PM THIS AFTERNOON TO 8 PM  
CDT THIS EVENING...  
   
DISCUSSION
 
 
LIGHT NORTHWESTERLY WINDS THIS MORNING ARE EXPECTED TO INCREASE  
WITH SUSTAINED SPEEDS BETWEEN 15 AND 20 MPH. WIND GUSTS UP TO 30  
MPH ARE EXPECTED. RELATIVE HUMIDITY VALUES ARE EXPECTED TO DROP  
DURING THE AFTERNOON HOURS IN THE PEAK OF DAYTIME MIXING OF THE  
BOUNDARY LAYER. RH VALUES ARE EXPECTED TO DROP TO NEAR 20 PERCENT.  
ONE THING TO NOTE IS THAT MIXING THIS AFTERNOON MAY BE DEEPER THAN  
FORECAST WHICH COULD RESULT IN LOWER RH VALUES (LESS THAN 20  
PERCENT) AND STRONGER NORTHWESTERLY WINDS.  
 
   
REST OF TODAY
 
 
SKY/WEATHER.........SUNNY (5-15 PERCENT).  
MAX TEMPERATURE.....AROUND 70.  
MIN HUMIDITY........22 PERCENT.  
WIND (20 FT)........NORTHWEST WINDS 9 TO 16 MPH. GUSTS UP TO 28 MPH  
IN THE LATE MORNING AND AFTERNOON.  
MIXING HEIGHT.......1500-2500 FT AGL INCREASING TO 8700-9600 FT  
AGL.  
TRANSPORT WINDS.....NORTHWEST 16 TO 24 MPH INCREASING TO 26 TO 29  
MPH LATE IN THE MORNING.  
HAINES INDEX........4 TO 6 OR MODERATE POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH TO HIGH POTENTIAL FOR  
LARGE PLUME DOMINATED FIRE GROWTH.  
 
TIME (CDT) 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM 6PM  
SKY (%).........17 11 7 4 0 2 5 7 12 18  
WEATHER COV.....  
WEATHER TYPE....  
TSTM COV........  
TEMP............45 51 56 60 64 67 69 70 70 70  
RH..............79 66 51 39 31 27 24 22 22 22  
20 FT WIND DIR..NW NW NW NW NW NW NW NW NW NW  
20 FT WIND SPD..9 12 14 14 15 16 16 16 15 14  
20 FT WIND GUST.13 16 18 19 20 22 22 22 20 19  
MIX HGT (KFT)...1.5 2.5 4.1 5.7 7.2 8.4 9.3 9.6 9.5 8.7  
TRANSP WIND DIR.NW NW NW NW NW NW NW NW NW NW  
TRANSP WIND SPD.16 21 24 26 28 29 29 29 29 26  
HAINES INDEX....4 4 4 5 5 5 6 6 6 6  
 

 
FORECASTER...BILLINGS WRIGHT  
REQUESTED BY...NATE MUNTER  
TYPE OF REQUEST...PRESCRIBED  
.TAG 2005906.2/GID  
.DELDT 04/20/20  
 
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