551
FNUS72 KFFC 120811
FWSFFC
SPOT FORECAST FOR CL51WHITEHALL PROJECT...USFS
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
411 AM EDT SAT SEP 12 2026
FORECAST IS BASED ON IGNITION TIME OF 0755 EDT ON SEPTEMBER 12.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.
DISCUSSION
CONDITIONS INITIALLY DRY WITH CHANCES FOR SHOWERS AND
THUNDERSTORMS INCREASING TO 30% WITHIN THE HOUR, AND TO 55 TO 60%
BY 8AM. WITH LVORI OF 9 OR MORE THROUGH DAYBREAK, CANNOT RULE OUT
THE DEVELOPMENT OF BRIEF PATCHY DENSE FOG. SHOULD SHOWERS DEVELOP,
VISIBILITIES ARE LIKELY TO REMAIN HIGHER THAN THEY WOULD UNDER
CLEAR CONDITIONS. 20-FT WINDS AT FORECAST START TIME WILL BE
LIGHT OUT OF THE SOUTH (<4 MPH), PICKING UP MORE SOLIDLY OUT OF
THE SW AT 4 TO 8 MPH BY NOON TO 1PM. SCATTERED TO NUMEROUS SHOWERS
AND THUNDERSTORMS WILL LINGER THROUGH THE MORNING AND INTO THE
AFTERNOON, WITH BEST CHANCES FOR DIRECT IMPACTS FROM 9AM THROUGH
4PM. SHOWERS AND THUNDERSTORMS MAY LINGER AFTER DARK. ANY
THUNDERSTORMS THAT FORM WILL BE CAPABLE OF PRODUCING GUSTY,
ERRATIC WINDS, FREQUENT LIGHTNING, AND LOCALLY HEAVY RAINFALL.
RAINFALL TOTALS ARE GENERALLY EXPECTED TO BE A QUARTER OF AN INCH
OR LESS, BUT A PASSING THUNDERSTORM COULD DROP A QUICK 2-3" OVER
THE COURSE OF ABOUT AN HOUR. EXPECT MIXING HEIGHTS TO PEAK IN THE
2.5-2.8KFT RANGE THIS AFTERNOON.
REST OF TODAY
SKY/WEATHER.........PARTLY SUNNY (60-70 PERCENT). AREAS OF FOG
EARLY IN THE MORNING. PATCHY FOG EARLY IN THE
MORNING. SHOWERS IN THE MORNING. CHANCE OF
THUNDERSTORMS THROUGH THE DAY. SHOWERS LIKELY
IN THE AFTERNOON.
CWR.................40 PERCENT INCREASING TO 60 PERCENT EARLY IN
THE MORNING, THEN INCREASING TO 80 PERCENT LATE
IN THE MORNING DECREASING TO 70 PERCENT EARLY
IN THE AFTERNOON DECREASING TO 60 PERCENT.
CHANCE OF THUNDER...48 PERCENT.
MAX TEMPERATURE.....AROUND 87.
MIN HUMIDITY........75 PERCENT.
DEWPOINT............73 INCREASING TO 76 LATE IN THE MORNING.
WIND (20 FT)........LIGHT WINDS BECOMING SOUTHWEST 5 TO 6 MPH IN
THE AFTERNOON. GUSTY AND ERRATIC WINDS EXPECTED
NEAR THUNDERSTORMS EARLY IN THE MORNING. GUSTY
AND ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS
LATE IN THE MORNING.
MIXING HEIGHT.......2800 FT AGL.
TRANSPORT WINDS.....SOUTHWEST 7 TO 9 MPH.
SMOKE DISPERSAL.....POOR (5000 KNOT-FT) EARLY IN THE MORNING
INCREASING TO FAIR (23700 KNOT-FT) IN THE
AFTERNOON.
LVORI...............6.
ADI.................8 TO 31.
PCPN AMOUNT.........0.23 INCHES.
CEILING (KFT).......0.6 INCREASING TO 2.5.
TIME (EDT) 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........67 66 73 77 80 71 63 57 50 53 55
WEATHER COV.....CHC LKY DEF DEF DEF LKY LKY LKY LKY LKY LKY
WEATHER TYPE....RNF RW RW RW RW RW RW RW RW RW RW
TSTM COV........ SCH SCH SCH CHC CHC CHC CHC CHC CHC CHC
CWR.............40 60 80 80 80 70 60 60 60 60 60
CHC OF THDR (%).10 20 20 20 30 30 30 50 50 50 50
TEMP............72 72 73 76 78 80 82 83 84 85 84
DEWPOINT........71 72 73 75 76 76 77 76 77 77 77
RH..............98 100 100 99 93 89 84 79 79 75 79
20 FT WIND DIR..S S S S S S SW SW SW S SW
20 FT WIND SPD..1 1 2 2 3 5 5 6 5 5 5
20 FT WIND GUST.6 6 7 9 10 12 13 14 13 13 13
MIX HGT (KFT)...0.8 0.8 1.0 1.2 1.5 1.9 2.2 2.7 2.7 2.8 2.4
TRANSP WIND DIR.S S S S S SW SW SW SW SW SW
TRANSP WIND SPD.7 7 7 7 8 9 9 9 9 9 8
LVORI...........8 8 8 7 5 4 4 3 3 3 3
ADI.............8 8 9 11 16 22 24 27 31 30 22
VRATE KT-FT/1K..5 5 6 8 11 15 17 21 21 24 16
VENTRATE CAT....PR PR PR PR PR PR PR PR PR PR PR
CEILING (KFT)...0.6 0.6 0.6 0.6 0.8 1.5 1.8 2.0 2.0 2.5 2.5
TONIGHT
SKY/WEATHER.........MOSTLY CLOUDY (50-60 PERCENT) THEN BECOMING
PARTLY CLOUDY (30-40 PERCENT). CHANCE OF
SHOWERS AND THUNDERSTORMS EARLY IN THE EVENING,
THEN SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS
LATE IN THE EVENING.
CWR.................50 PERCENT DECREASING TO 30 PERCENT EARLY IN
THE EVENING, THEN DECREASING TO 20 PERCENT LATE
IN THE EVENING DECREASING TO 10 PERCENT IN THE
LATE EVENING AND OVERNIGHT.
CHANCE OF THUNDER...47 PERCENT.
MIN TEMPERATURE.....AROUND 70.
MAX HUMIDITY........100 PERCENT.
DEWPOINT............74 DECREASING TO 71 AFTER 3 AM.
WIND (20 FT)........LIGHT WINDS. GUSTY AND ERRATIC WINDS EXPECTED
NEAR THUNDERSTORMS EARLY IN THE EVENING.
MIXING HEIGHT.......400 FT AGL.
TRANSPORT WINDS.....SOUTHWEST 6 TO 7 MPH.
SMOKE DISPERSAL.....POOR (2100 KNOT-FT).
LVORI...............6.
ADI.................3 TO 18.
PCPN AMOUNT.........0.09 INCHES.
CEILING (KFT).......2.5 INCREASING TO 25.
TIME (EDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........55 56 51 50 43 21 24 22 28 31 26 27
WEATHER COV.....CHC CHC CHC SCH
WEATHER TYPE....RW RW RW RW
TSTM COV........CHC CHC CHC SCH
CWR.............50 50 30 20 10 10 10 10 10 10 0 0
CHC OF THDR (%).50 50 30 20 10 10 10 10 0 0 0 0
TEMP............83 81 77 76 75 74 73 73 72 72 71 71
DEWPOINT........76 76 75 75 74 74 73 73 72 72 71 71
RH..............81 84 94 96 98 98 99 100 100 100 100 100
20 FT WIND DIR..SW SW SW SW S SW SW SW SW SW W W
20 FT WIND SPD..3 2 2 1 1 1 1 1 1 1 1 1
20 FT WIND GUST.10 9 7 6 6 5 5 5 5 5 5 5
MIX HGT (KFT)...2.1 1.1 0.5 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.5 0.5
TRANSP WIND DIR.SW SW SW SW SW SW SW SW SW W W W
TRANSP WIND SPD.7 7 6 6 6 6 6 6 6 6 6 6
LVORI...........3 5 6 8 9 9 9 9 9 9 9 9
ADI.............18 3 3 3 3 3 3 3 3 3 3 3
VRATE KT-FT/1K..12 7 2 2 2 2 2 2 2 2 3 3
VENTRATE CAT....PR PR PR PR PR PR PR PR PR PR PR PR
CEILING (KFT)...2.5 2.5 2.5 7.0 7.0 7.0 15 20 25 25 25 25
SUNDAY
SKY/WEATHER.........SUNNY (10-20 PERCENT).
CWR.................0 PERCENT.
CHANCE OF THUNDER...1 PERCENT.
MAX TEMPERATURE.....AROUND 92.
MIN HUMIDITY........53 PERCENT.
DEWPOINT............71 INCREASING TO 73 IN THE LATE MORNING AND
AFTERNOON.
WIND (20 FT)........LIGHT WINDS BECOMING WEST AROUND 5 MPH EARLY IN
THE AFTERNOON, THEN BECOMING LIGHT EARLY IN THE
AFTERNOON BECOMING WEST AROUND 5 MPH EARLY IN
THE AFTERNOON BECOMING LIGHT BECOMING WEST
AROUND 5 MPH LATE IN THE AFTERNOON.
MIXING HEIGHT.......6000 FT AGL.
TRANSPORT WINDS.....WEST 6 TO 10 MPH.
SMOKE DISPERSAL.....POOR (2200 KNOT-FT) EARLY IN THE MORNING
INCREASING TO GOOD (42900 KNOT-FT) IN THE
AFTERNOON.
LVORI...............5.
ADI.................3 EARLY IN THE MORNING INCREASING TO 61 IN THE
AFTERNOON.
PCPN AMOUNT.........0.00 INCHES.
CEILING (KFT).......25 DECREASING TO 20 EARLY IN THE MORNING, THEN
DECREASING TO 12 LATE IN THE MORNING DECREASING
TO 9.0 LATE IN THE MORNING DECREASING TO 7.0
DECREASING TO 3.5 EARLY IN THE AFTERNOON
INCREASING TO 15 INCREASING TO 20 LATE IN THE
AFTERNOON INCREASING TO 25.
TIME (EDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........22 19 13 16 12 8 14 17 20 8 8 12
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CWR.............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............70 70 71 73 78 82 85 88 89 91 92 91
DEWPOINT........70 70 71 73 75 75 75 74 73 73 72 72
RH..............100 100 100 100 90 79 71 64 59 56 53 53
20 FT WIND DIR..W W W W W W W W W W W W
20 FT WIND SPD..1 1 1 2 2 3 5 3 5 3 5 5
20 FT WIND GUST.5 5 6 7 8 9 10 10 10 10 12 12
MIX HGT (KFT)...0.4 0.4 0.5 0.9 1.6 2.8 3.9 4.6 5.3 6.0 5.6 5.4
TRANSP WIND DIR.W W W W NW NW W W W W W W
TRANSP WIND SPD.7 6 7 7 7 9 10 9 9 8 8 9
LVORI...........9 9 8 8 5 3 3 1 1 1 1 1
ADI.............3 6 7 8 15 32 49 54 61 59 59 58
VRATE KT-FT/1K..2 2 3 5 10 22 34 37 43 42 41 41
VENTRATE CAT....PR PR PR PR PR PR PR PR FR FR FR FR
CEILING (KFT)...25 25 20 20 12 9.0 7.0 3.5 4.0 15 20 25
FORECASTER...LMARLOW
REQUESTED BY...BENJAMIN THIGPEN
TYPE OF REQUEST...PRESCRIBED
.TAG 2621579.1/FFC
.DELDT 09/12/26
.FORMATTERVERSION 2.0.0
.EMAIL BENJAMIN.THIGPEN@UGA.EDU
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