955
FNUS72 KCHS 210600
FWSCHS
SPOT FORECAST FOR C93 C4 FMNF...USFS
NATIONAL WEATHER SERVICE CHARLESTON SC
200 AM EDT WED OCT 21 2026
FORECAST IS BASED ON IGNITION TIME OF 0900 EDT ON OCTOBER 21.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.
DISCUSSION
..CRITICAL RH THIS AFTERNOON
STRONG HIGH PRESSURE WILL EXTEND ACROSS THE REGION TODAY. VERY
DRY AIR COMBINED WITH TEMPERATURES WARMING INTO THE MID 70S WILL
PUSH RH VALUES DOWN TO AROUND 23% THIS AFTERNOON. WINDS WILL REMAIN
FAIRLY LIGHT OUT OF THE NORTH. CONDITIONS ARE TOO DRY TO SUPPORT
FOG DEVELOPMENT TONIGHT INTO EARLY THURSDAY MORNING. WINDS WILL GO
CALM AROUND SUNSET AND PERSIST THROUGH THE NIGHT RESULTING IN
VERY POOR DISPERSION.
REST OF TODAY
SKY/WEATHER.........SUNNY.
CHANCE OF PCPN......0 PERCENT.
MAX TEMPERATURE.....AROUND 76.
MIN HUMIDITY........23 PERCENT.
WIND (20 FT)........LIGHT WINDS BECOMING NORTH AROUND 5-8 MPH
A FEW GUSTS TO 10-15 MPH COULD OCCUR.
MIXING HEIGHT.......MAX 3800 FT AGL.
TRANSPORT WINDS.....NORTH 10 TO 14 MPH.
MAX ADI.............64.
INVERSION END.......0930.
TIME (EDT) 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........43 23 16 18 14 9 0 2 1
WEATHER TYPE....
TSTM COV........
CHC OF PCPN (%).0 0 0 0 0 0 0 0 0
TEMP............50 57 63 68 70 75 76 76 74
RH..............79 62 50 37 32 26 24 23 25
20 FT WIND DIR..N N N N N N N N N
20 FT WIND SPD..4 4 5 5 5 5 4 4 3
20 FT WIND GUST.13 14 16 14 14 13 13 13 4
MIX HGT (KFT)...0.9 1.4 1.9 2.6 3.0 3.5 3.8 3.8 3.2
TRANSP WIND DIR.N N N N N N N N N
TRANSP WIND SPD.10 10 10 14 14 14 14 14 14
LVORI...........9 4 3 1 1 1 1 1 1
ADI.............6 22 34 48 51 58 63 64 50
TONIGHT
SKY/WEATHER.........CLEAR.
CHANCE OF PCPN......0 PERCENT.
MIN TEMPERATURE.....AROUND 41.
MAX HUMIDITY........92 PERCENT.
WIND (20 FT)........CALM WINDS.
MAX LVORI...........7.
MIN ADI.............1.
INVERSION BEGIN.....1900.
TIME (EDT) 6 PM 8 PM 10 PM MIDNGT 2 AM 4 AM
SKY (%).........1 4 3 3 4 3
WEATHER TYPE....NONE NONE NONE NONE NONE NONE
TSTM COV........
CHC OF PCPN (%).0 0 0 0 0 0
TEMP............69 60 53 50 46 44
RH..............31 49 61 67 76 82
20 FT WIND......N 2 N 0 N 0 N 0 N 0 N 0
20 FT WIND GUST.
MIX HGT (FT)....1200 400 400 400 400 400
TRANSPORT WIND..N 4 N 4 N 0 N 0 N 0 N 2
LVORI...........2 3 4 6 6 7
ADI.............1 1 1 1 1 1
THURSDAY
SKY/WEATHER.........SUNNY.
CHANCE OF PCPN......0 PERCENT.
MAX TEMPERATURE.....AROUND 75.
MIN HUMIDITY........37 PERCENT.
WIND (20 FT)........LIGHT WINDS.
MIXING HEIGHT.......MAX 4100 FT AGL.
TRANSPORT WINDS.....LIGHT WINDS BECOMING NORTH 6 TO 10 MPH IN THE
LATE MORNING AND AFTERNOON.
MAX ADI.............51.
INVERSION END.......0930.
TIME (EDT) 6 AM 9 AM NOON 3 PM
SKY (%).........2 0 0 0
WEATHER TYPE....NONE NONE NONE NONE
TSTM COV........
CHC OF PCPN (%).0 0 0 0
TEMP............42 48 67 74
RH..............89 75 41 33
20 FT WIND......N 0 N 1G5 N 3G11 N 2G9
MIX HGT (FT)....400 600 2800 4100
TRANSPORT WIND..N 2 N 6 N 10 N 10
LVORI...........8 6 1 1
ADI.............1 1 36 51
FORECASTER...TAYLOR
REQUESTED BY...WILL MCCANN
TYPE OF REQUEST...PRESCRIBED
.TAG 2624174.0/CHS
.DELDT 10/21/26
.FORMATTERVERSION 2.0.0
.EMAIL WILLIAM.MCCANN@USDA.GOV
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