227
FNUS72 KCHS 211825
FWSCHS

Spot Forecast for Main Road Fire...Wildland Fire Service
National Weather Service Charleston SC
225 PM EDT Fri Aug 21 2026

Forecast is based on forecast start time of 1500 EDT on August 21.
If conditions become unrepresentative...contact the National Weather
Service.


.DISCUSSION...
The sea breeze has moved inland of the burn site as of 3 PM,
yielding SE winds 10 to 15 mph. Isolated showers and thunderstorms
are possible this afternoon, with the best chance for
precipitation later this afternoon from around 5 to 9 PM. Winds
overnight will shift to the SW with speeds around 10 mph. The sea
breeze will again push inland of the burn site on Saturday at
Noon/1 PM. Isolated to scattered showers/thunderstorms are
forecast Saturday afternoon.


.REST OF TODAY...

Sky/weather.........Sunny.
Chance of pcpn......10 percent.
Max temperature.....Around 90.
Min humidity........68 percent.
Wind (20 ft)........South winds 11 to 13 mph.
Mixing Height.......Max 1800 ft AGL.
Transport winds.....South around 16 mph.
Max ADI.............36.

TIME (EDT)      3PM 4PM 5PM
Sky (%).........14  16  23
Weather type....
Tstm cov........
Chc of pcpn (%).10  10  10
Temp............89  89  88
RH..............68  68  70
20 FT wind dir..S   S   S
20 FT wind spd..11  12  13
20 FT wind gust.14  16  18
Mix hgt (kft)...1.8 1.8 1.5
Transp wind dir.S   S   S
Transp wind spd.16  16  16
LVORI...........3   3   3
ADI.............31  36  34

.TONIGHT...

Sky/weather.........Partly cloudy then becoming mostly cloudy then
                    becoming partly cloudy then becoming mostly
                    cloudy then becoming partly cloudy. Chance of
                    showers and thunderstorms through the night.
Chance of pcpn......40 percent.
Min temperature.....Around 77.
Max humidity........94 percent.
Wind (20 ft)........South winds 7 to 13 mph shifting to the
                    southwest 6 to 7 mph after 3 am. Gusty and
                    erratic winds expected near thunderstorms early
                    in the evening. Gusty and erratic winds
                    expected near thunderstorms early in the
                    morning.
Max LVORI...........6.
Min ADI.............1.
Inversion Begin.....2000.

TIME (EDT)      6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........29  39  52  50  51  59  60  63  65  59  53  45
Weather type....        RW  RW  RW  RW  RW  RW  RW  RW  RW  RW
Tstm cov........        SCH SCH SCH CHC CHC CHC CHC CHC CHC SCH
Chc of pcpn (%).10  10  20  20  20  30  40  30  40  40  30  30
Temp............86  84  82  81  81  81  81  80  80  79  78  78
RH..............75  80  85  88  88  88  88  88  88  91  91  91
20 FT wind dir..S   S   S   S   S   SW  SW  SW  SW  SW  SW  SW
20 FT wind spd..13  13  12  12  11  10  9   8   7   7   7   6
20 FT wind gust.18  18  18  18  16  16  16  13  13  13  13  13
Mix hgt (kft)...1.5 1.5 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8
Transp wind dir.S   S   S   S   S   S   SW  SW  SW  SW  SW  SW
Transp wind spd.18  18  18  12  12  12  10  10  10  10  10  10
LVORI...........4   3   4   5   5   5   5   5   5   5   5   6
ADI.............1   21  13  12  11  10  9   8   8   8   8   6

.SATURDAY...

Sky/weather.........Partly sunny. Chance of showers and slight
                    chance of thunderstorms early in the morning.
                    Slight chance of showers and thunderstorms
                    early in the afternoon, then chance of showers
                    and thunderstorms late in the afternoon.
Chance of pcpn......50 percent.
Max temperature.....Around 90.
Min humidity........72 percent.
Wind (20 ft)........Southwest winds 6 to 10 mph. Gusty and erratic
                    winds expected near thunderstorms early in the
                    morning. Gusty and erratic winds expected near
                    thunderstorms in the afternoon.
Mixing Height.......Max 2600 ft AGL.
Transport winds.....Southwest 8 to 14 mph.
Max ADI.............33.
Inversion End.......0900.

TIME (EDT)      6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........50  54  59  56  57  66  65  64  58  58  72  84
Weather type....RW  RW                      RW  RW  RW  RW  RW
Tstm cov........SCH SCH                     SCH CHC CHC CHC CHC
Chc of pcpn (%).30  30  10  10  10  10  10  20  40  40  50  50
Temp............77  77  78  79  82  84  86  87  88  88  88  86
RH..............94  94  94  91  85  82  77  75  72  75  75  77
20 FT wind dir..SW  SW  SW  SW  W   SW  SW  SW  SW  SW  S   S
20 FT wind spd..6   6   6   6   6   6   6   6   7   8   9   10
20 FT wind gust.13  11  11  11  11  11  9   11  11  13  14  14
Mix hgt (kft)...0.8 0.8 0.8 1.3 1.7 2.1 2.5 2.6 2.4 2.1 1.6 1.4
Transp wind dir.SW  SW  SW  W   W   W   SW  SW  SW  SW  SW  SW
Transp wind spd.8   8   8   10  10  10  10  10  10  14  14  14
LVORI...........6   6   6   4   4   3   3   3   3   3   3   3
ADI.............8   8   8   18  23  28  33  30  33  32  31  26

$$
Forecaster...Maskell
Requested by...Ream Thomas
Type of request...WILDFIRE
.TAG 2620180.0/CHS
.DELDT 08/21/26
.FormatterVersion 2.0.0
.EMAIL ream_thomas@fws.gov