039
FNUS72 KJAX 121117
FWSJAX
SPOT FORECAST FOR FW 1_5...FFWCC
NATIONAL WEATHER SERVICE JACKSONVILLE FL
717 AM EDT WED AUG 12 2026
FORECAST IS BASED ON IGNITION TIME OF 0900 EDT ON AUGUST 12.
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.
..HEAT ADVISORY IN EFFECT FROM NOON TO 7 PM THIS EVENING
...STRONG TO ISOLATED SEVERE THUNDERSTORMS POSSIBLE LATE THIS
AFTERNOON AND EARLY THIS EVENING...
DISCUSSION
WEST-NORTHWESTERLY SURFACE AND TRANSPORT WINDS WILL PREVAIL AT
THE BURN SITE TODAY, WITH BREEZY TRANSPORT SPEEDS COMBINING
WITH ELEVATED MIXING HEIGHTS TO CREATE GOOD DAYTIME DISPERSION
VALUES. DRY WEATHER IS EXPECTED THROUGH AT LEAST EARLY AFTERNOON,
FOLLOWED BY SCATTERED THUNDERSTORMS DEVELOPING NORTH OF THE BURN
SITE DURING THE MID-AFTERNOON HOURS THAT MAY SWEEP SOUTHWARD
BY THE LATE AFTERNOON AND EARLY EVENING. STRONG TO ISOLATED
SEVERE STORMS WILL BE POSSIBLE, WITH STRONGER STORMS BEING
CAPABLE OF PRODUCING STRONG WIND GUSTS, FREQUENT LIGHTNING
STRIKES, AND BRIEFLY HEAVY DOWNPOURS. OPPRESSIVE HEAT AND
HUMIDITY WILL OTHERWISE CONTINUE, WITH PEAK HEAT INDEX VALUES
AROUND 110 DEGREES THIS AFTERNOON AND AGAIN ON THURSDAY
AFTERNOON. A SIMILAR WEATHER PATTERN IS FORECAST ON THURSDAY,
WITH CHANCES FOR AFTERNOON AND EVENING THUNDERSTORMS
IMPACTING THE BURN SITE. WESTERLY SURFACE AND TRANSPORT WINDS
WILL PREVAIL, WITH ELEVATED MIXING HEIGHTS AGAIN YIELDING
GOOD DAYTIME DISPERSION VALUES DURING THE AFTERNOON HOURS.
REST OF TODAY
TIME (EDT) 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........22 16 20 20 18 19 25 50 47
WEATHER COV..... SCH CHC SCH
WEATHER TYPE.... RW RW RW
TSTM COV........ SCH CHC SCH
CHC OF PCPN (%).0 0 0 10 10 10 20 30 20
TEMP............80 85 89 91 93 95 95 96 94
RH..............91 80 70 60 55 55 50 50 55
20 FT WIND DIR..W W W W W W W W W
20 FT WIND SPD..5 6 7 8 8 8 9 9 9
20 FT WIND GUST.12 13 14 15 16 15 15 16 16
MIX HGT (KFT)...1.3 2.1 3.0 3.5 4.1 4.7 4.1 3.5 3.0
TRANSP WIND DIR.W NW NW NW W W W W W
TRANSP WIND SPD.9 10 12 12 12 10 12 12 12
DISPERSION IDX..20 30 45 50 60 60 55 50 45
LVORI...........5 3 2 1 1 1 1 1 1
TONIGHT
TIME (EDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........48 60 72 66 59 53 51 47 43 39 30 34
WEATHER COV.....SCH SCH CHC SCH
WEATHER TYPE....RW RW RW RW
TSTM COV........SCH SCH CHC SCH
CHC OF PCPN (%).20 20 30 20 10 10 0 0 0 0 0 0
TEMP............91 90 85 83 82 81 80 80 79 78 78 77
RH..............60 65 75 80 82 82 88 85 88 91 91 94
20 FT WIND DIR..W W W W SW W SW SW W W W W
20 FT WIND SPD..9 8 8 7 6 5 5 5 5 3 3 3
20 FT WIND GUST.15 15 15 14 13 12 12 12 12 10 10 10
MIX HGT (KFT)...2.2 1.4 0.6 0.6 0.5 0.5 0.5 0.5 0.4 0.4 0.4 0.4
TRANSP WIND DIR.W W W W W W W W W W W W
TRANSP WIND SPD.12 10 10 9 9 8 8 8 8 8 8 8
DISPERSION IDX..35 20 10 6 6 6 5 5 5 4 4 4
LVORI...........1 3 3 4 4 5 5 5 6 6 6 6
THURSDAY
TIME (EDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........34 34 24 26 22 24 22 30 48 57 57 62
WEATHER COV..... CHC CHC CHC
WEATHER TYPE.... RW RW RW
TSTM COV........ CHC CHC CHC
CHC OF PCPN (%).0 0 0 0 0 10 10 10 10 30 30 30
TEMP............77 76 77 80 86 90 91 94 95 95 95 93
RH..............94 97 94 91 75 70 65 60 55 55 55 60
20 FT WIND DIR..W W W W W W W W W W W W
20 FT WIND SPD..2 2 2 3 5 5 5 6 6 6 7 8
20 FT WIND GUST.9 9 9 9 10 10 10 10 10 10 12 13
MIX HGT (KFT)...0.5 0.6 0.7 1.4 2.1 2.9 3.8 4.6 5.5 4.6 3.7 2.8
TRANSP WIND DIR.W W W W W W W W W W W W
TRANSP WIND SPD.8 8 8 8 8 8 8 7 7 7 8 9
DISPERSION IDX..4 4 10 15 25 30 40 45 50 45 40 35
LVORI...........6 7 6 5 3 3 2 1 1 1 1 2
FORECASTER...NELSON
REQUESTED BY...R SPIRK
TYPE OF REQUEST...PRESCRIBED
.TAG 2619516.0/JAX
.DELDT 08/12/26
.FORMATTERVERSION 2.0.0
.EMAIL RUDY.SPIRK@MYFWC.COM
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