315  
FNUS74 KHUN 291121  
FWSHUN  
 
SPOT FORECAST FOR GRINDSTONE...USFS  
NATIONAL WEATHER SERVICE HUNTSVILLE AL  
521 AM CST THU FEB 29 2024  
 
FORECAST IS BASED ON IGNITION TIME OF 1000 CST ON FEBRUARY 29. IF  
CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL WEATHER  
SERVICE.  
   
DISCUSSION
 
 
PARTLY-MOSTLY CLOUDY SKIES AND DRY CONDITIONS WILL EXIST IN THE  
VICINITY OF THE PRESCRIBED BURN SITE TODAY. A NORTHEASTERLY LOW-  
LEVEL FLOW WILL SUSTAIN THE COOL/DRY AIRMASS THAT IS CURRENTLY IN  
PLACE ACROSS THE REGION, BUT WITH AFTERNOON TEMPERATURES EXPECTED  
TO REACH THE L-M 50S WE EXPECT MINRH VALUES TO REACH 24%  
(ESPECIALLY BETWEEN THE HOURS OF 1-4 PM). TRANSPORT WINDS OF 10-15  
MPH AND MIXING HEIGHTS OF 2400 FT EARLY THIS AFTERNOON WILL  
RESULT IN FAIR SMOKE PLUME DISPERSION TO THE SW. RAIN SHOWERS WILL  
BEGIN TO OVERSPREAD THE REGION FROM THE WEST LATER THIS EVENING,  
WITH WETTING RAINS LIKELY TO OCCUR AT THE SITE PRIOR TO SUNRISE  
FRIDAY.  
   
REST OF TODAY
 
 
SKY/WEATHER.........MOSTLY CLOUDY (70-80 PERCENT).  
MAX TEMPERATURE.....AROUND 53.  
MIN HUMIDITY........24 PERCENT.  
WIND (20 FT)........NORTHEAST WINDS 6 TO 8 MPH.  
CWR.................10 PERCENT.  
CHANCE OF PCPN......10 PERCENT.  
MIXING HEIGHT.......2400 FT AGL.  
TRANSPORT WINDS.....NORTHEAST 10 TO 15 MPH.  
LVORI...............2.  
 
TIME (CST) 10A 11A 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........59 68 67 72 79 85 86 86  
WEATHER COV.....  
WEATHER TYPE....  
TEMP............43 46 49 52 52 53 54 53  
RH..............34 30 26 24 24 25 25 27  
20 FT WIND DIR..050 050 050 050 050 060 060 070  
20 FT WIND SPD..9 9 9 8 8 8 7 7  
20 FT WIND GUST.16 15 15 14 13 12 12 10  
MIX HGT (KFT)...2.0 2.2 2.4 2.3 2.2 2.1 1.7 1.4  
TRANSP WIND DIR.050 050 050 050 060 060 060 060  
TRANSP WIND SPD.15 13 12 13 14 14 13 10  
DISPERSION IDX..20 33 32 35 37 36 28 18  
LVORI...........2 2 1 1 1 2 2 2  
CWR.............0 0 0 0 0 0 0 10  
CHC OF PCPN (%).0 0 0 0 0 0 0 10  
   
TONIGHT
 
 
SKY/WEATHER.........CLOUDY (85-95 PERCENT).  
MIN TEMPERATURE.....AROUND 41.  
MAX HUMIDITY........100 PERCENT.  
WIND (20 FT)........EAST WINDS 5 TO 8 MPH SHIFTING TO THE SOUTHEAST  
AROUND 8 MPH OVERNIGHT.  
CWR.................80 PERCENT.  
CHANCE OF PCPN......80 PERCENT.  
MIXING HEIGHT.......200 FT AGL.  
TRANSPORT WINDS.....EAST 5 TO 8 MPH SHIFTING TO THE SOUTHEAST 10 TO  
13 MPH OVERNIGHT.  
LVORI...............3.  
 
TIME (CST) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM  
SKY (%).........90 83 87 85 87 88 91 90 91 93 94 95  
WEATHER COV.....  
WEATHER TYPE....  
TEMP............51 49 47 46 46 45 45 45 45 44 43 43  
RH..............33 37 43 47 49 53 58 60 62 70 79 82  
20 FT WIND DIR..070 080 080 100 100 110 110 120 130 130 120 120  
20 FT WIND SPD..7 6 6 6 7 8 9 9 9 10 9 9  
20 FT WIND GUST.12 9 9 9 10 13 14 15 15 16 15 15  
MIX HGT (KFT)...1.0 0.7 0.5 0.2 0.2 0.2 0.2 0.4 0.5 0.7 0.7 0.7  
TRANSP WIND DIR.060 060 060 060 070 090 100 110 130 140 130 120  
TRANSP WIND SPD.8 7 6 5 5 5 6 8 10 13 13 13  
DISPERSION IDX..9 4 0 0 0 0 5 7 9 11 11 11  
LVORI...........2 2 2 2 2 2 3 3 3 4 4 4  
CWR.............10 10 10 10 10 20 20 30 40 60 70 80  
CHC OF PCPN (%).10 10 10 10 10 20 20 30 40 60 70 80  
   
FRIDAY
 
 
SKY/WEATHER.........CLOUDY (90-100 PERCENT).  
MAX TEMPERATURE.....AROUND 53.  
MIN HUMIDITY........70 PERCENT.  
WIND (20 FT)........SOUTHEAST WINDS 7 TO 8 MPH.  
CWR.................100 PERCENT.  
CHANCE OF PCPN......100 PERCENT.  
MIXING HEIGHT.......700 FT AGL.  
TRANSPORT WINDS.....SOUTHEAST 7 TO 12 MPH.  
LVORI...............6.  
 
TIME (CST) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........97 98 93 96 95 93 92 92 92 93 92 90  
WEATHER COV.....  
WEATHER TYPE....  
TEMP............42 41 42 44 46 48 49 50 51 51 51 52  
RH..............93 100 100 100 93 86 86 83 83 83 86 83  
20 FT WIND DIR..110 110 110 120 120 130 130 130 130 130 130 130  
20 FT WIND SPD..9 9 10 10 9 9 10 10 9 9 9 8  
20 FT WIND GUST.15 15 16 16 15 15 16 16 15 15 14 13  
MIX HGT (KFT)...0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.6 0.6 0.5 0.5 0.5  
TRANSP WIND DIR.120 110 110 110 110 100 100 110 130 130 140 150  
TRANSP WIND SPD.12 10 8 7 7 8 9 10 10 10 10 9  
DISPERSION IDX..10 9 7 6 6 8 9 10 9 8 8 7  
LVORI...........8 8 8 6 6 6 4 4 4 4 4 4  
CWR.............100 100 100 100 100 100 80 80 80 80 80 80  
CHC OF PCPN (%).100 100 100 100 100 100 80 80 80 80 80 80  
 

 
 
FORECASTER...DIXON  
REQUESTED BY...CRAIG MOORE  
TYPE OF REQUEST...PRESCRIBED  
.TAG 2405235.0/HUN  
.DELDT 02/29/24  
.FORMATTERVERSION 2.0.0  
.EMAIL GARY.C.MOORE@USDA.GOV  
 
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