039
FNUS72 KJAX 191223
FWSJAX
SPOT FORECAST FOR MASF...FFS
NATIONAL WEATHER SERVICE JACKSONVILLE FL
723 AM EST FRI DEC 19 2025
FORECAST IS BASED ON IGNITION TIME OF 0700 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.
..LOW DAYTIME DISPERSIONS SATURDAY AREA-WIDE
DISCUSSION
BREEZY SOUTHWEST WINDS THIS MORNING 10-15 MPH WITH GUSTS TO 20 TO
25 MPH WILL QUICKLY TURN WESTERLY AS A COLD FRONT MOVES THROUGH
THE SITE AREA DURING THE MID TO LATE MORNING HOURS WITH A BRIEF
WINDOW OF HIGHER GUSTS TO 30-35 MPH AND A QUICK SHOWER BEFORE THE
FRONT EXITS TO THE SOUTHEAST. WINDS WILL THEN TURN NORTHWESTERLY
BY THE EARLY AFTERNOON HOURS AS HIGH PRESSURE BUILDS IN FROM THE
WEST NORTHWEST TODAY WITH CLEARING SKIES AND A DRIER AIRMASS
ARRIVING THROUGH TONIGHT. DISPERSIONS WILL BE IN THE GOOD RANGE.
HIGH PRESSURE WILL BUILD NORTH OF THE REGION TONIGHT INTO SATURDAY
MORNING WITH BREEZY NORTHWESTERLY WINDS 10-15 MPH GUSTING TO 20 MPH
TURNING NORTHERLY BEFORE MIDNIGHT UNDER CLEAR SKIES. THE HIGH WILL
SHIFT NORTHEAST OF THE REGION SATURDAY AFTERNOON WITH WINDS BECOMING
NORTHEASTERLY BY MID MORNING AND A BIT LIGHTER 8-12 MPH WITH GUSTS
TO 15 MPH, THEN EASTERLY BY AFTERNOON. LIGHTER TRANSPORT WINDS WILL
CREATE POOR DISPERSIONS. MIN RH VALUES WILL REMAIN ABOVE CRITICAL
LEVELS SATURDAY.
REST OF TODAY
TIME (EST) 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........74 68 65 63 55 48 39 29 19 13 12
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CHC OF PCPN (%).0 0 0 0 0 0 0 0 0 0 0
CHC OF THDR (%).0 0 0 0 0 0 0 0 0 0 0
TEMP............65 66 70 73 73 75 74 74 73 72 69
RH..............100 100 93 81 79 69 69 62 59 55 57
HEAT INDEX (F)..58 61 66 70 73 75 75 75 74 72 69
WIND CHILL (F)..58 61 66 70 73 75 75 75 74 72 69
20 FT WIND DIR..SW SW W W W W W W NW NW NW
20 FT WIND SPD..7 8 9 9 10 10 10 9 9 8 7
20 FT WIND GUST.17 18 21 20 18 17 16 16 16 15 14
MIX HGT (KFT)...0.5 0.8 1.2 1.6 2.0 2.4 2.9 2.6 2.3 2.1 1.5
TRANSP WIND DIR.W W W W W W W W W W NW
TRANSP WIND SPD.16 17 18 20 18 18 17 15 14 14 13
DISPERSION IDX..17 20 27 39 43 45 45 40 36 33 25
LVORI...........5 5 4 4 3 3 2 2 2 2 2
TONIGHT
TIME (EST) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........11 11 9 9 7 8 7 7 7 6 9 7
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CHC OF PCPN (%).0 0 0 0 0 0 0 0 0 0 0 0
CHC OF THDR (%).0 0 0 0 0 0 0 0 0 0 0 0
TEMP............65 61 59 57 55 53 52 51 50 49 49 49
RH..............60 65 64 62 61 64 63 63 66 71 71 74
HEAT INDEX (F)..66 63 61 61 60 59 59 59 59 59 59 58
WIND CHILL (F)..66 63 61 61 60 59 59 59 59 59 59 58
20 FT WIND DIR..NW NW NW N N N N N N N N N
20 FT WIND SPD..6 6 6 6 6 6 6 6 6 6 6 6
20 FT WIND GUST.15 15 15 16 17 17 17 17 17 16 15 14
MIX HGT (KFT)...1.0 0.4 0.4 0.4 0.4 0.5 0.5 0.5 0.5 0.5 0.5 0.4
TRANSP WIND DIR.NW N N N N N N N N N N N
TRANSP WIND SPD.13 13 14 15 15 15 15 14 14 13 12 12
DISPERSION IDX..17 8 8 9 10 10 10 9 9 8 8 7
LVORI...........2 3 3 3 3 3 3 3 3 3 3 3
SATURDAY
TIME (EST) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........6 4 4 4 3 6 10 13 15 17 19 20
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CHC OF PCPN (%).0 0 0 0 0 0 0 0 0 0 0 0
CHC OF THDR (%).0 0 0 0 0 0 0 0 0 0 0 0
TEMP............49 48 52 57 63 66 68 68 69 70 69 67
RH..............74 80 74 69 65 63 61 61 61 59 61 65
HEAT INDEX (F)..58 59 62 66 69 71 72 73 73 73 72 70
WIND CHILL (F)..58 59 62 66 69 71 72 73 73 73 72 70
20 FT WIND DIR..N N N NE NE NE NE NE NE NE NE NE
20 FT WIND SPD..6 6 5 5 6 6 6 6 6 6 6 5
20 FT WIND GUST.13 13 12 10 10 9 9 8 8 8 8 8
MIX HGT (KFT)...0.4 0.4 1.1 1.9 2.6 2.7 2.9 3.0 2.9 2.7 2.6 1.9
TRANSP WIND DIR.N N NE NE NE NE E E E E E E
TRANSP WIND SPD.10 10 10 9 9 8 7 7 6 7 7 7
DISPERSION IDX..7 12 16 23 28 26 24 23 21 21 20 15
LVORI...........3 4 4 3 3 2 2 2 2 2 2 3
FORECASTER...BRICKER
REQUESTED BY...JEFF DARR
TYPE OF REQUEST...PRESCRIBED
.TAG 2527950.0/JAX
.DELDT 12/19/25
.FORMATTERVERSION 2.0.0
.EMAIL JEFF.DARR@FDACS.GOV
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