233
FNUS72 KCHS 202051
FWSCHS

Spot Forecast for Main Trail Fire...US Wildland Fire Service
National Weather Service Charleston SC
451 PM EDT Thu Aug 20 2026

Forecast is based on forecast start time of 1700 EDT on August 20.
If conditions become unrepresentative...contact the National Weather
Service.

...HEAT ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING...


.DISCUSSION...
The sea breeze has pushed inland of the burn site, resulting in SE
winds, generally around 10 mph with some gusts upwards of 15
mph. Dry conditions will prevail through the remainder of this
afternoon and tonight. Expect winds to shift to the SW late
tonight while remaining around 10 mph. Another shift to the SE is
forecast Friday around noontime as the sea breeze pushes inland of
the burn site again. Scattered thunderstorms are possible late
Friday afternoon into Friday evening.


.REST OF TODAY...

Sky/weather.........Sunny.
Chance of pcpn......0 percent.
Max temperature.....Around 92.
Min humidity........64 percent.
Wind (20 ft)........South winds around 10 mph.
Mixing Height.......Max 1200 ft AGL.
Transport winds.....South around 12 mph.
Max ADI.............19.

TIME (EDT)      5PM
Sky (%).........3
Weather type....
Tstm cov........
Chc of pcpn (%).0
Temp............91
RH..............66
20 FT wind dir..S
20 FT wind spd..10
20 FT wind gust.14
Mix hgt (kft)...1.2
Transp wind dir.S
Transp wind spd.12
LVORI...........3
ADI.............19

.TONIGHT...

Sky/weather.........Mostly clear.
Chance of pcpn......0 percent.
Min temperature.....Around 79.
Max humidity........91 percent.
Wind (20 ft)........South winds 8 to 10 mph shifting to the
                    southwest 6 to 7 mph overnight.
Max LVORI...........5.
Min ADI.............1.
Inversion Begin.....2000.

TIME (EDT)      6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........3   4   6   7   6   9   7   6   12  6   8   10
Weather type....
Tstm cov........
Chc of pcpn (%).0   0   0   0   0   0   0   0   0   0   0   0
Temp............89  87  86  84  84  84  84  83  82  82  81  81
RH..............68  72  75  80  80  82  80  82  85  85  85  85
20 FT wind dir..S   S   S   S   S   S   S   SW  SW  SW  SW  SW
20 FT wind spd..10  10  10  9   8   8   8   7   7   7   7   6
20 FT wind gust.16  16  16  16  14  14  13  13  13  13  13  13
Mix hgt (kft)...1.1 1.0 0.8 0.7 0.7 0.7 0.7 0.7 0.7 0.6 0.7 0.7
Transp wind dir.S   S   S   S   S   S   SW  SW  SW  SW  SW  SW
Transp wind spd.12  12  12  10  10  10  10  10  10  8   8   8
LVORI...........4   3   4   4   4   4   4   4   5   5   5   5
ADI.............1   9   7   7   7   6   6   6   6   5   5   4

.FRIDAY...

Sky/weather.........Mostly sunny.
Chance of pcpn......10 percent.
Max temperature.....Around 91.
Min humidity........70 percent.
Wind (20 ft)........Southwest winds 6 to 9 mph shifting to the
                    south 11 to 17 mph in the afternoon.
Mixing Height.......Max 2000 ft AGL.
Transport winds.....Southwest 8 to 16 mph.
Max ADI.............35.
Inversion End.......0900.

TIME (EDT)      6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........16  26  35  28  23  28  25  23  28  38  32  35
Weather type....
Tstm cov........
Chc of pcpn (%).0   0   0   10  10  10  10  10  10  10  10  10
Temp............80  79  81  82  85  87  88  89  89  90  89  88
RH..............88  91  88  85  77  75  72  73  73  70  73  75
20 FT wind dir..SW  SW  SW  SW  SW  SW  S   S   S   S   S   S
20 FT wind spd..7   7   8   7   6   7   9   11  12  15  16  17
20 FT wind gust.13  14  14  11  9   9   11  14  16  18  22  22
Mix hgt (kft)...0.7 0.7 0.8 1.1 1.4 1.7 1.9 2.0 1.9 1.8 1.6 1.4
Transp wind dir.SW  SW  SW  SW  SW  SW  S   S   S   S   S   S
Transp wind spd.8   8   8   8   8   8   12  12  12  16  16  16
LVORI...........5   5   5   4   4   3   3   3   3   3   3   3
ADI.............8   8   8   11  15  20  25  28  33  34  35  34

$$
Forecaster...Maskell
Requested by...Ream Thomas
Type of request...WILDFIRE
.TAG 2620109.0/CHS
.DELDT 08/20/26
.FormatterVersion 2.0.0
.EMAIL ream_thomas@fws.gov