441
FNUS72 KJAX 181852
FWSJAX
SPOT FORECAST FOR PENNER POND-WATERHOLE...US FOREST SERVICE
NATIONAL WEATHER SERVICE JACKSONVILLE FL
252 PM EDT THU JUN 18 2026
FORECAST IS BASED ON IGNITION TIME OF 0900 EDT ON JUNE 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.
..HEAT ADVISORY IN EFFECT UNTIL 7 PM EDT THIS EVENING
..HIGH DAYTIME DISPERSION VALUES ON FRIDAY
DISCUSSION
WEST-SOUTHWESTERLY SURFACE AND TRANSPORT WINDS WILL SLOWLY INCREASE
AFTER MIDNIGHT THROUGH THE EARLY MORNING HOURS ON FRIDAY, WHICH
WILL LIMIT CHANCES FOR FOG FORMATION. BREEZY WEST-SOUTHWESTERLY
TRANSPORT WINDS ARE EXPECTED BY THE MID TO LATE MORNING HOURS
ON FRIDAY, WHICH WILL CREATE HIGH DAYTIME DISPERSION VALUES
AT THE BURN SITE. SCATTERED SHOWERS AND THUNDERSTORMS ARE
EXPECTED TO DEVELOP ON FRIDAY AFTERNOON AND EVENING, WITH
ISOLATED ACTIVITY POTENTIALLY CONTINUING THROUGH THE OVERNIGHT
HOURS. WEST-SOUTHWESTERLY SURFACE AND TRANSPORT SPEEDS WILL
GRADUALLY DIMINISH ON FRIDAY NIGHT, BUT ABUNDANT CLOUD COVER
WILL LIKELY PRECLUDE SIGNIFICANT FOG FORMATION DURING THE
PREDAWN AND EARLY MORNING HOURS ON SATURDAY. NUMEROUS MAINLY
AFTERNOON AND EVENING SHOWERS AND THUNDERSTORMS ARE FORECAST ON
SATURDAY. WESTERLY SURFACE AND TRANSPORT WINDS WILL STRENGTHEN
SLIGHTLY BY THE LATE MORNING AND EARLY AFTERNOON HOURS ON
SATURDAY, CREATING GOOD DAYTIME DISPERSION VALUES BEFORE CLOUD
COVER AND RAINFALL CHANCES INCREASE LATER IN THE AFTERNOON.
JUNETEENTH
TIME (EDT) 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........56 53 69 53 64 73 61 71 67
WEATHER COV..... SCH SCH CHC CHC CHC
WEATHER TYPE.... RW RW RW RW RW
TSTM COV........ SCH CHC CHC CHC
CHC OF PCPN (%).10 20 10 10 10 20 30 40 40
CHC OF THDR (%).10 10 10 10 10 20 30 40 40
TEMP............82 85 87 89 90 90 91 92 90
RH..............85 75 75 65 65 65 60 60 60
HEAT INDEX (F)..90 96 100 102 103 103 103 105 101
20 FT WIND DIR..SW SW SW W W W W W W
20 FT WIND SPD..8 8 9 9 9 9 9 9 8
20 FT WIND GUST.13 20 21 21 21 21 21 21 21
MIX HGT (KFT)...2.3 3.1 3.8 4.3 4.5 4.5 4.3 3.8 3.1
TRANSP WIND DIR.SW W W W W W W W W
TRANSP WIND SPD.16 18 20 20 20 18 18 17 17
DISPERSION IDX..50 76 90 100 105 85 80 70 65
LVORI...........4 3 3 1 1 1 1 1 1
FRIDAY NIGHT
TIME (EDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........69 66 66 58 59 56 48 48 52 45 43 42
WEATHER COV.....CHC SCH SCH SCH
WEATHER TYPE....RW RW RW RW
TSTM COV........CHC SCH
CHC OF PCPN (%).30 20 10 10 10 10 0 10 20 20 10 10
CHC OF THDR (%).30 20 10 10 10 10 0 10 10 10 10 10
TEMP............89 88 85 82 81 81 80 80 79 79 78 78
RH..............60 65 70 77 82 79 82 82 85 85 88 88
HEAT INDEX (F)..99 98 94 88 87 86 85 85 79 79 78 78
20 FT WIND DIR..W W W W SW SW SW W W W W W
20 FT WIND SPD..8 7 6 5 3 3 3 2 2 2 2 2
20 FT WIND GUST.20 17 15 14 13 13 12 12 12 12 12 10
MIX HGT (KFT)...2.3 1.4 0.8 0.5 0.6 0.6 0.6 0.6 0.6 0.5 0.4 0.5
TRANSP WIND DIR.W W W W W SW SW W W W W W
TRANSP WIND SPD.15 13 10 9 9 9 9 9 9 9 8 8
DISPERSION IDX..45 25 10 6 5 5 5 4 4 4 4 4
LVORI...........1 3 3 4 4 4 5 5 5 5 6 6
SATURDAY
TIME (EDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........55 76 68 68 68 68 77 85 94 94 94 94
WEATHER COV.....SCH CHC CHC CHC CHC CHC CHC CHC DEF DEF DEF DEF
WEATHER TYPE....RW RW RW RW RW RW RW RW RW RW RW RW
TSTM COV........ CHC CHC CHC DEF DEF DEF DEF
CHC OF PCPN (%).20 40 50 50 50 50 50 50 90 90 90 90
CHC OF THDR (%).10 10 10 10 10 40 40 40 90 90 90 90
TEMP............77 76 78 81 84 86 88 89 89 89 88 87
RH..............88 90 94 85 80 75 70 65 65 65 65 70
HEAT INDEX (F)..77 76 78 88 95 98 102 102 102 102 99 98
20 FT WIND DIR..W W W W W W W W W W W W
20 FT WIND SPD..2 2 3 3 3 5 5 6 6 6 6 5
20 FT WIND GUST.10 10 10 12 13 13 14 15 15 15 15 14
MIX HGT (KFT)...0.6 0.9 1.3 1.7 2.3 2.8 3.4 3.9 4.0 3.6 2.9 2.2
TRANSP WIND DIR.W W W W W W W W W W W W
TRANSP WIND SPD.8 9 9 10 12 12 13 12 12 12 10 10
DISPERSION IDX..4 5 20 25 35 45 55 60 65 55 45 30
LVORI...........6 6 5 4 4 3 3 1 1 1 2 3
FORECASTER...NELSON
REQUESTED BY...DANIEL CEDENO
TYPE OF REQUEST...PRESCRIBED
.TAG 2615788.0/JAX
.DELDT 06/18/26
.FORMATTERVERSION 2.0.0
.EMAIL DANIEL.CEDENO@USDA.GOV
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