218  
FNUS74 KHUN 280919  
FWSHUN  
 
SPOT FORECAST FOR GRINSTONE/MILL CREEK...USFS  
NATIONAL WEATHER SERVICE HUNTSVILLE AL  
419 AM CDT THU MAR 28 2024  
 
FORECAST IS BASED ON IGNITION TIME OF 0800 CDT ON MARCH 28.  
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL WEATHER  
SERVICE.  
   
DISCUSSION
 
 
DRY CONDITIONS WILL PREVAIL TODAY AS BREEZY NORTHERLY WINDS  
ADVECT IN A DRIER AIR MASS BY THE AIR MASS. IN TURN, MIN RH  
VALUES WILL DROP INTO THE 25-30 PERCENT RANGE BY THE AFTERNOON.  
MIXING HEIGHTS WILL BE 800 FT AT IGNITION, BUT CLIMB TO AROUND  
5 KFT BY THE AFTERNOON.  
   
REST OF TODAY
 
 
SKY/WEATHER.........SUNNY (0-5 PERCENT).  
TEMPERATURE.........41 AT IGNITION...MAX 64.  
RH..................70 PERCENT AT IGNITION...MIN 28 PERCENT.  
WIND (20 FT)........WINDS NORTH AT 14 MPH AT IGNITION...OTHERWISE  
NORTH WINDS 7 TO 14 MPH.  
CWR.................0 PERCENT.  
CHANCE OF PCPN......0 PERCENT.  
LAL.................1.  
MIXING HEIGHT.......800 FT AGL AT IGNITION...OTHERWISE 5000 FT AGL.  
TRANSPORT WINDS.....NORTH 13 TO 21 MPH DECREASING TO AROUND 9 MPH  
LATE IN THE AFTERNOON.  
LVORI...............2.  
 
TIME (CDT) 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........1 0 1 1 0 1 1 1 2 1  
WEATHER COV.....  
WEATHER TYPE....  
TEMP............41 45 51 55 58 61 63 64 64 63  
RH..............70 60 46 40 36 32 29 28 29 29  
20 FT WIND DIR..010 020 020 020 010 010 000 350 350 350  
20 FT WIND SPD..14 16 14 13 12 10 10 10 9 8  
20 FT WIND GUST.21 23 22 18 18 15 14 15 13 13  
MIX HGT (KFT)...0.8 1.4 2.0 2.8 3.5 4.2 4.5 4.7 5.0 3.4  
TRANSP WIND DIR.010 020 020 020 010 010 010 000 000 350  
TRANSP WIND SPD.15 18 21 21 18 16 15 14 13 9  
DISPERSION IDX..13 21 28 63 64 81 79 76 73 39  
LVORI...........3 3 1 1 1 1 1 1 1 1  
CWR.............0 0 0 0 0 0 0 0 0 0  
CHC OF PCPN (%).0 0 0 0 0 0 0 0 0 0  
LAL.............1 1 1 1 1 1 1 1 1 1  
   
TONIGHT
 
 
SKY/WEATHER.........CLEAR (0-5 PERCENT).  
TEMPERATURE.........MIN 39.  
RH..................MAX 82 PERCENT.  
WIND (20 FT)........NORTH WINDS 5 TO 6 MPH EARLY IN THE EVENING  
BECOMING LIGHT.  
CWR.................0 PERCENT.  
CHANCE OF PCPN......0 PERCENT.  
LAL.................1.  
MIXING HEIGHT.......0 FT AGL.  
TRANSPORT WINDS.....NORTHWEST 1 TO 6 MPH SHIFTING TO THE SOUTHWEST  
2 TO 3 MPH OVERNIGHT.  
LVORI...............3.  
 
TIME (CDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM  
SKY (%).........2 2 0 1 0 0 0 0 0 0 0 1  
WEATHER COV.....  
WEATHER TYPE....  
TEMP............62 59 54 51 48 46 45 43 42 41 40 39  
RH..............31 39 46 52 58 63 65 67 70 73 76 82  
20 FT WIND DIR..340 350 350 330 330 330 320 310 260 220 200 210  
20 FT WIND SPD..7 6 5 0 3 0 0 3 2 2 3 3  
20 FT WIND GUST.10 9 6 6 6 6 6 6 5 5 6 6  
MIX HGT (KFT)...1.9 0.3 0.3 0.2 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1  
TRANSP WIND DIR.340 340 340 330 330 300 250 230 220 210 210 200  
TRANSP WIND SPD.6 3 2 1 1 1 2 2 2 3 3 3  
DISPERSION IDX..14 1 1 0 0 0 1 1 1 2 2 2  
LVORI...........1 2 2 2 3 3 3 3 3 3 4 4  
CWR.............0 0 0 0 0 0 0 0 0 0 0 0  
CHC OF PCPN (%).0 0 0 0 0 0 0 0 0 0 0 0  
LAL.............1 1 1 1 1 1 1 1 1 1 1 1  
   
FRIDAY
 
 
SKY/WEATHER.........SUNNY (5-15 PERCENT).  
TEMPERATURE.........MAX 70.  
RH..................MIN 27 PERCENT.  
WIND (20 FT)........LIGHT WINDS BECOMING SOUTHWEST 5 TO 7 MPH IN  
THE LATE MORNING AND AFTERNOON.  
CWR.................0 PERCENT.  
CHANCE OF PCPN......0 PERCENT.  
LAL.................1.  
MIXING HEIGHT.......5300 FT AGL.  
TRANSPORT WINDS.....SOUTHWEST 3 TO 12 MPH INCREASING TO 13 TO 16  
MPH IN THE AFTERNOON.  
LVORI...............3.  
 
TIME (CDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........1 2 0 0 1 1 2 3 6 10 13 19  
WEATHER COV.....  
WEATHER TYPE....  
TEMP............39 38 41 48 57 62 65 67 68 69 70 69  
RH..............85 82 76 68 49 41 36 32 30 28 27 30  
20 FT WIND DIR..210 200 190 200 210 220 220 220 220 210 210 210  
20 FT WIND SPD..3 0 5 6 7 7 7 8 8 8 8 8  
20 FT WIND GUST.5 6 7 8 10 10 10 12 12 13 13 13  
MIX HGT (KFT)...0.1 0.1 0.8 1.6 2.3 3.0 3.8 4.5 4.8 5.0 5.3 3.6  
TRANSP WIND DIR.200 190 200 220 230 230 230 220 220 220 220 210  
TRANSP WIND SPD.3 3 6 8 10 12 13 14 15 16 16 14  
DISPERSION IDX..2 2 3 4 5 43 58 73 83 94 97 61  
LVORI...........4 4 4 4 1 1 1 1 1 1 1 1  
CWR.............0 0 0 0 0 0 0 0 0 0 0 0  
CHC OF PCPN (%).0 0 0 0 0 0 0 0 0 0 0 0  
LAL.............1 1 1 1 1 1 1 1 1 1 1 1  
 

 
FORECASTER...PRITCHETT  
REQUESTED BY...TURNER  
TYPE OF REQUEST...PRESCRIBED  
.TAG 2408640.0/HUN  
.DELDT 03/28/24  
.FORMATTERVERSION 2.0.0  
.EMAIL SCOTT.TURNER2@USDA.GOV  
 
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