042  
FNUS72 KJAX 151115  
FWSJAX  
 
SPOT FORECAST FOR DCSP DCB6C...DEP, FPS  
NATIONAL WEATHER SERVICE JACKSONVILLE FL  
615 AM EST FRI DEC 15 2017  
 
FORECAST IS BASED ON IGNITION TIME OF 0800 EST ON DECEMBER 15.  
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.  
   
..LOW DAYTIME DISPERSION VALUES EXPECTED ON SATURDAY
 
 
   
DISCUSSION
 
 
DRY WEATHER IS EXPECTED THROUGH THE WEEKEND. WEST-SOUTHWESTERLY  
SURFACE WINDS WILL SLOWLY INCREASE TO 5-10 MPH BY THE LATE MORNING  
AND EARLY AFTERNOON HOURS. SURFACE WINDS WILL SHIFT TO A WESTERLY  
DIRECTION DURING THE MID TO LATE AFTERNOON HOURS. WESTERLY  
TRANSPORT WINDS WILL STRENGTHEN THIS AFTERNOON, CREATING GOOD  
DISPERSION VALUES. SURFACE WINDS WILL SHIFT TO NORTHWEST TO  
NORTHERLY DIRECTION OVERNIGHT, WITH SPEEDS SUSTAINED AROUND 5 MPH  
OVERNIGHT AS A COOLER AND DRIER AIR MASS FILTERS OVER OUR REGION.  
WINDS WILL BECOME NORTHEASTERLY BY LATE SATURDAY MORNING, WITH  
LIGHT SURFACE AND TRANSPORT SPEEDS RESULTING IN LOW DAYTIME  
DISPERSION VALUES AREA-WIDE.  
 
FOG POTENTIAL AND OTHER REMARKS...SIGNIFICANT FOG FORMATION IS  
NOT EXPECTED THROUGH THIS WEEKEND.  
   
REST OF TODAY
 
 
TIME (EST) 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........81 80 80 78 76 73 71 69 67 59  
CHC OF PCPN (%).0 0 0 0 0 0 0 0 0 0  
LAL.............1 1 1 1 1 1 1 1 1 1  
TEMP............54 58 63 67 70 72 73 73 72 69  
RH..............100 93 84 73 68 64 60 55 60 65  
20 FT WIND DIR..S SW SW SW SW SW W W W W  
20 FT WIND SPD..1 2 3 4 5 6 7 7 7 6  
20 FT WIND GUST.2 5 8 9 10 11 11 11 10  
MIX HGT (KFT)...0.4 0.6 0.7 1.6 2.4 3.3 3.2 3.0 2.9 2.0  
TRANSP WIND DIR.S SW SW SW W W W W W W  
TRANSP WIND SPD.3 6 8 10 13 14 16 17 16 12  
DISPERSION IDX..2 4 10 20 30 45 50 55 40 25  
LVORI...........9 6 4 3 3 1 1 1 1 3  
   
TONIGHT
 
 
TIME (EST) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM  
SKY (%).........52 45 46 47 48 43 38 33 39 44 49 49  
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  
TEMP............63 59 57 55 54 53 52 51 50 49 49 48  
RH..............80 90 93 93 90 86 83 80 80 80 77 77  
20 FT WIND DIR..W W W NW NW NW NW NW N N N N  
20 FT WIND SPD..3 2 2 2 3 3 3 3 3 3 3 3  
20 FT WIND GUST.5 5 5 5 5 5 5 5 5  
MIX HGT (KFT)...1.1 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3  
TRANSP WIND DIR.W W W NW NW NW NW NW N N N N  
TRANSP WIND SPD.7 2 1 1 2 2 2 2 2 2 2 2  
DISPERSION IDX..10 1 1 1 1 1 1 1 1 1 1 1  
LVORI...........4 7 8 8 7 7 6 5 5 4 4 4  
   
SATURDAY
 
 
TIME (EST) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........49 53 53 53 36 36 36 36 36 36 31 31  
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  
TEMP............47 47 48 52 57 60 63 65 66 66 65 63  
RH..............76 74 68 55 45 40 40 40 40 45 45 50  
20 FT WIND DIR..N N N N NE NE NE NE NE NE NE NE  
20 FT WIND SPD..3 3 3 3 3 3 3 3 3 3 3 3  
20 FT WIND GUST.5 5 5 5 5 5 5 5 6 6 6 6  
MIX HGT (KFT)...0.3 0.3 0.5 0.8 1.1 1.4 1.7 2.0 1.9 1.9 1.8 1.3  
TRANSP WIND DIR.N N N NE NE NE NE NE NE NE NE NE  
TRANSP WIND SPD.2 2 5 7 8 8 7 6 6 7 7 6  
DISPERSION IDX..1 2 3 6 15 20 20 20 20 20 20 15  
LVORI...........4 3 3 3 2 2 2 2 2 2 2 2  
 

 
FORECASTER...NELSON  
REQUESTED BY...ASHLEY REGELSKI  
TYPE OF REQUEST...PRESCRIBED  
.TAG 1720004.0/JAX  
.EMAIL ASHLEY.REGELSKI@DEP.STATE.FL.US  
 
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