750  
FNUS72 KJAX 191412  
FWSJAX  
 
SPOT FORECAST FOR THOMPSON RX BURN...FLORIDA FOREST SERVICE  
NATIONAL WEATHER SERVICE JACKSONVILLE FL  
912 AM EST THU DEC 19 2024  
 
FORECAST IS BASED ON IGNITION TIME OF 0900 EST ON DECEMBER 19.  
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL WEATHER  
SERVICE.  
 
PLEASE CONTACT OUR OFFICE AT (904) 741-4370 IF YOU HAVE QUESTIONS  
OR CONCERNS WITH THIS FORECAST.  
   
DISCUSSION
 
 
ANY LINGERING FOG OR LOW CLOUDINESS WILL DISSIPATE AT THE  
BURN SITE BEFORE 10 AM THIS MORNING. OTHERWISE, DRY WEATHER  
WILL CONTINUE THROUGH THE WEEKEND. LIGHT NORTHERLY SURFACE  
AND TRANSPORT WINDS AT IGNITION TIME WILL SHIFT TO NORTHWESTERLY  
TOWARDS NOON, WITH SPEEDS AROUND 10 MPH EXPECTED THROUGH THE  
AFTERNOON HOURS, CREATING FAIR TO GOOD DAYTIME DISPERSION  
VALUES. ANOTHER ROUND OF LOW CLOUDS AND POTENTIALLY DENSE  
FOG WILL MOVE OVER THE BURN SITE FROM THE EAST DURING THE  
PREDAWN AND EARLY MORNING HOURS ON FRIDAY. LOW CLOUDS AND FOG  
WILL THEN QUICKLY DISSIPATE DURING THE EARLY MORNING HOURS  
AS WEST-NORTHWESTERLY SURFACE AND TRANSPORT WINDS STRENGTHEN.  
BREEZY CONDITIONS DURING THE AFTERNOON HOURS WILL YIELD GOOD  
DAYTIME DISPERSION VALUES, WITH A DRIER AIR MASS DROPPING  
MINIMUM RELATIVE HUMIDITY VALUES DOWN TO AROUND 35 PERCENT  
ON FRIDAY AFTERNOON.  
   
REST OF TODAY
 
 
TIME (EST) 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........69 61 49 45 37 37 33 26 18  
WEATHER COV.....WID  
WEATHER TYPE....FOG  
CHC OF PCPN (%).10 0 0 0 0 0 0 0 0  
LAL.............1 1 1 1 1 1 1 1 1  
TEMP............63 65 68 70 72 74 75 74 72  
RH..............100 100 90 84 75 65 60 60 65  
WIND CHILL (F)..63 65 68 70 72 74 75 74 72  
20 FT WIND DIR..N N N NW NW NW NW NW NW  
20 FT WIND SPD..5 5 6 6 6 7 7 7 6  
20 FT WIND GUST.7 7 9 9 9 10 10 10 9  
MIX HGT (KFT)...0.9 1.3 1.7 2.1 2.6 3.2 3.7 3.4 1.0  
TRANSP WIND DIR.N N N N NW NW NW NW NW  
TRANSP WIND SPD.7 7 7 8 8 9 10 10 10  
DISPERSION IDX..10 15 20 25 30 35 45 45 20  
LVORI...........8 7 5 4 3 3 1 1 3  
   
TONIGHT
 
 
TIME (EST) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM  
SKY (%).........8 2 3 3 4 36 40 44 48 50 52 51  
WEATHER COV..... ARS ARS  
WEATHER TYPE.... FOG FOG  
CHC OF PCPN (%).0 0 0 0 0 0 0 10 10 10 10 10  
LAL.............1 1 1 1 1 1 1 1 1 1 1 1  
TEMP............68 66 63 61 60 58 58 57 55 54 53 53  
RH..............75 81 87 90 93 96 93 93 96 96 96 93  
WIND CHILL (F)..68 66 63 61 60 58 58 57 55 54 53 53  
20 FT WIND DIR..NW NW N N N N N N NW NW NW NW  
20 FT WIND SPD..5 3 2 2 1 1 1 1 1 1 2 2  
20 FT WIND GUST.7 6 3 3 2 2 2 2 2 2 3 3  
MIX HGT (KFT)...0.5 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4  
TRANSP WIND DIR.NW NW N N N N N N N NW NW NW  
TRANSP WIND SPD.9 8 8 8 8 7 7 6 6 6 7 7  
DISPERSION IDX..10 5 4 4 4 3 3 3 3 3 3 3  
LVORI...........4 5 6 6 6 8 7 7 8 8 8 7  
   
FRIDAY
 
 
TIME (EST) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........49 40 27 20 20 9 5 6 6 4 2 2  
WEATHER COV.....ARS PTY  
WEATHER TYPE....FOG FOG  
CHC OF PCPN (%).10 0 0 0 0 0 0 0 0 0 0 0  
LAL.............1 1 1 1 1 1 1 1 1 1 1 1  
TEMP............52 51 51 55 59 62 64 65 66 67 66 63  
RH..............96 93 89 75 60 55 45 40 35 35 35 40  
WIND CHILL (F)..52 51 51 55 59 62 64 65 66 67 66 63  
20 FT WIND DIR..NW NW NW W NW NW NW NW NW NW NW NW  
20 FT WIND SPD..3 5 6 7 8 9 10 10 12 12 10 8  
20 FT WIND GUST.6 7 9 10 13 14 16 16 17 17 16 13  
MIX HGT (KFT)...0.4 0.5 0.8 1.2 1.5 1.8 2.2 2.5 2.6 2.8 2.9 2.1  
TRANSP WIND DIR.NW W W NW NW NW W W W W W W  
TRANSP WIND SPD.8 9 10 12 13 15 16 17 17 18 17 16  
DISPERSION IDX..5 10 15 20 25 35 45 50 55 55 55 45  
LVORI...........7 6 5 3 2 1 1 1 1 1 1 1  
 

 
FORECASTER...NELSON  
REQUESTED BY...BRIAN STEELE  
TYPE OF REQUEST...PRESCRIBED  
.TAG 2428768.0/JAX  
.DELDT 12/19/24  
.FORMATTERVERSION 2.0.0  
.EMAIL BRIAN.STEELE@FDACS.GOV  
 
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