Spot Forecast
Issued by NWS Atlanta, GA
Issued by NWS Atlanta, GA
665
FNUS72 KFFC 230837
FWSFFC
Spot Forecast for 113...USFS
National Weather Service Peachtree City GA
437 AM EDT Thu May 23 2024
Forecast is based on ignition time of 0800 EDT on May 23.
If conditions become unrepresentative...contact the National Weather
Service.
.DISCUSSION...
Good morning, Amy. A humid start to the day is expected at the burn
site, with RH values just over 95 percent at ignition time. As
temperatures warm through the morning, RH will drop to between 60-65
percent just after 12 PM, and down to a minimum of 53 percent around
4-5 PM this afternoon. 20 ft winds will be light this morning, from
S at 2 mph or less. 20 ft winds will shift to SW and increase
slightly to 3 mph by 1 PM and for much of the afternoon. Transport
winds over the burn site will start the morning from S at 3 mph or
less, shifting to SW at 5 mph by 10 AM and increasing to SW at 7 mph
by noon, increasing to around 9 mph by 4-5 PM. Mixing heights of
4500-5000 ft this afternoon, combined with the transport winds, will
lead to ADI values of 45-55 in the mid to late afternoon. Scattered
showers and thunderstorms are forecast to stay well north of the
burn site this afternoon, with only a 10 percent chance of a stray
shower reaching the central Georgia in the mid to late afternoon
hours.
20 ft winds and transport winds will diminish quickly this evening,
dropping to 2 mph or less after sunset. Furthermore, with dewpoints
lingering in the mid to upper 60s through the overnight hours,
relative humidity at the burn site will increase to as high as 98
percent on Friday morning. The combination of humidity and light
winds will lead to LVORI values of 8 to 9 between 4 AM and 7 AM
tomorrow morning. Shower and thunderstorm activity will sink a bit
farther south on Friday, with isolated storms possible near the burn
area, mainly in the afternoon and evening. Please feel free to
contact us if you have any further questions or concerns.
.REST OF TODAY...
Sky/weather.........Partly sunny (50-60 percent).
CWR.................10 percent.
LAL.................1.
Max temperature.....Around 89.
Min humidity........53 percent.
Dewpoint............69.
Wind (20 ft)........Light winds.
Mixing height.......4900 ft AGL.
Transport winds.....Southwest 1 to 9 mph.
Smoke dispersal.....Poor (400 knot-ft) early in the morning
increasing to good (37200 knot-ft) in the
afternoon.
LVORI...............5.
ADI.................2 early in the morning increasing to 55 in the
afternoon.
Haines Index........3 to 4 or very low to low potential for large
plume dominated fire growth.
Pcpn amount.........0.00 inches.
CEILING (KFT).......25 decreasing to 3.0 late in the morning, then
increasing to 4.0 early in the afternoon
increasing to 5.0 late in the afternoon.
TIME (EDT) 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........52 60 47 53 56 62 55 69 39 46
Weather cov.....
Weather type....
Tstm cov........
CWR.............0 0 0 0 0 0 0 10 10 10
LAL.............1 1 1 1 1 1 1 1 1 1
Temp............69 73 77 80 82 84 85 86 87 87
Dewpoint........68 69 71 70 69 70 69 68 67 67
RH..............96 87 80 72 65 62 57 55 53 53
20 FT wind dir..S S S S S SW SW SW SW SW
20 FT wind spd..1 1 1 2 2 3 3 3 3 2
20 FT wind gust.2 3 3 6 6 7 7 7 8 6
Mix hgt (kft)...0.3 0.9 2.3 3.0 3.5 4.4 4.9 4.9 4.8 4.8
Transp wind dir.S S SW SW SW SW SW SW SW SW
Transp wind spd.1 3 5 6 7 6 6 7 9 9
LVORI...........8 6 4 3 2 1 1 1 1 1
ADI.............2 4 16 24 29 35 38 46 53 55
Haines index....4 4 4 3 3 3 4 4 4 4
Vrate kt-ft/1K..0 4 12 16 19 24 26 29 34 37
Ventrate Cat....PR PR PR PR PR PR PR PR PR PR
Ceiling (kft)...25 25 25 3.0 3.5 4.0 4.0 4.0 5.0 5.0
.TONIGHT...
Sky/weather.........Partly cloudy (30-40 percent).
CWR.................10 percent.
LAL.................1.
Min temperature.....Around 67.
Max humidity........98 percent.
Dewpoint............68.
Wind (20 ft)........Light winds.
Mixing height.......300 ft AGL.
Transport winds.....Southwest 1 to 7 mph.
Smoke dispersal.....Fair (28000 knot-ft) early in the evening
decreasing to poor (300 knot-ft) late in the
night.
LVORI...............5.
ADI.................0 to 33.
Haines Index........3 to 4 or very low to low potential for large
plume dominated fire growth.
Pcpn amount.........0.00 inches.
CEILING (KFT).......5.0 increasing to 25 late in the evening, then
decreasing to 20 late in the evening increasing
to 25 overnight decreasing to 20 decreasing to
15 after 3 am decreasing to 12 decreasing to
9.0 early in the morning.
TIME (EDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........35 19 33 30 28 27 38 48 45 42 44 42
Weather cov.....
Weather type....
Tstm cov........
CWR.............10 0 0 0 0 0 0 0 0 10 0 0
LAL.............1 1 1 1 1 1 1 1 1 1 1 1
Temp............86 84 81 76 75 73 72 71 70 70 69 68
Dewpoint........67 68 69 69 69 68 68 68 67 67 67 67
RH..............53 59 68 77 82 84 87 88 90 90 93 95
20 FT wind dir..SW SW SW SW SW S SW SW SW S SW SW
20 FT wind spd..2 1 1 1 1 1 1 1 1 1 1 1
20 FT wind gust.5 5 2 2 2 2 2 2 2 2 2 2
Mix hgt (kft)...3.6 1.4 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3
Transp wind dir.SW SW SW SW S S S SW SW SW SW SW
Transp wind spd.7 3 1 1 1 1 1 1 1 1 1 1
LVORI...........1 3 4 4 6 6 6 6 7 7 8 9
ADI.............33 2 1 0 0 1 1 1 1 1 1 1
Haines index....4 4 4 4 4 4 4 4 4 4 4 3
Vrate kt-ft/1K..28 10 0 0 0 0 0 0 0 0 0 0
Ventrate Cat....PR PR PR PR PR PR PR PR PR PR PR PR
Ceiling (kft)...5.0 5.0 5.0 25 25 20 25 25 20 15 12 9.0
.FRIDAY...
Sky/weather.........Mostly sunny (45-55 percent). Slight chance of
showers and thunderstorms late in the
afternoon.
CWR.................10 percent increasing to 20 percent late in the
afternoon.
LAL.................1 until 1500, then 2.
Max temperature.....Around 89.
Min humidity........53 percent.
Dewpoint............68.
Wind (20 ft)........Light winds. Gusty and erratic winds expected
near thunderstorms late in the afternoon.
Mixing height.......5000 ft AGL.
Transport winds.....Southwest 1 to 2 mph shifting to the west 3 to
9 mph in the late morning and afternoon, then
shifting to the southwest late in the
afternoon.
Smoke dispersal.....Poor (300 knot-ft) early in the morning
increasing to good (31500 knot-ft) in the
afternoon.
LVORI...............5.
ADI.................1 early in the morning increasing to 50 in the
afternoon.
Haines Index........3 to 4 or very low to low potential for large
plume dominated fire growth.
Pcpn amount.........0.04 inches.
CEILING (KFT).......12 increasing to 20 early in the morning, then
decreasing to 15 early in the morning
increasing to 20 late in the morning decreasing
to 3.0 increasing to 4.0 early in the afternoon
increasing to 5.0.
TIME (EDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........42 40 36 42 53 59 57 53 52 49 45 43
Weather cov..... SCH SCH SCH
Weather type.... RW RW RW
Tstm cov........ SCH SCH SCH
CWR.............0 0 10 10 10 10 10 10 10 20 20 20
LAL.............1 1 1 1 1 1 1 1 1 2 2 2
Temp............68 68 69 73 77 80 83 85 86 87 87 86
Dewpoint........67 67 68 69 70 70 70 69 68 68 68 68
RH..............98 96 94 85 78 71 64 59 56 53 53 54
20 FT wind dir..SW W W W SW SW SW SW SW SW SW SW
20 FT wind spd..1 1 1 1 1 1 2 3 3 3 3 2
20 FT wind gust.2 2 2 3 3 5 6 6 7 7 7 6
Mix hgt (kft)...0.3 0.3 0.3 1.0 2.5 3.3 3.7 4.5 5.0 4.8 4.4 4.2
Transp wind dir.SW SW SW W W W W W SW SW SW SW
Transp wind spd.1 1 1 2 3 5 5 7 7 8 9 8
LVORI...........9 8 7 5 4 3 2 1 1 1 1 1
ADI.............1 1 1 3 10 16 24 36 45 50 50 46
Haines index....3 3 3 3 3 3 3 3 4 4 4 4
Vrate kt-ft/1K..0 0 0 3 9 11 16 26 32 32 32 32
Ventrate Cat....PR PR PR PR PR PR PR PR PR PR PR PR
Ceiling (kft)...12 20 15 20 20 3.0 3.5 4.0 4.0 5.0 5.0 5.0
$$
Forecaster...King
Requested by...Amy Galetka
Type of request...PRESCRIBED
.TAG 2414930.0/FFC
.DELDT 05/23/24
.FormatterVersion 2.0.0
.EMAIL amy.galetka@usda.gov