226
FNUS72 KCHS 201833
FWSCHS
SPOT FORECAST FOR 93C4 PLANNING FMNF...USFS
NATIONAL WEATHER SERVICE CHARLESTON SC
233 PM EDT TUE OCT 20 2026
FORECAST IS BASED ON IGNITION TIME OF 0900 EDT ON OCTOBER 21.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.
DISCUSSION
HIGH PRESSURE WILL EXTEND ACROSS THE REGION THIS WEEK AS A STRONG
NOR'EASTER MEANDERS OFF THE MID-ATLANTIC COAST. THIS WILL KEEP
DRY CONDITIONS IN PLACE WITH NO CHANCES FOR MEASURABLE RAINFALL
OR FOG THROUGH WEDNESDAY NIGHT.
THE VENTILATION RATE WILL REMAIN ABOVE 34000 FROM LATE WEDNESDAY
MORNING THROUGH LATE AFTERNOON. LIGHT WINDS CAN BE EXPECTED FOR THE
NEXT SEVERAL NIGHTS, RESULTING IN POOR TO VERY POOR DISPERSION.
WEDNESDAY
SKY/WEATHER.........SUNNY.
CHANCE OF PCPN......0 PERCENT.
MAX TEMPERATURE.....AROUND 73.
MIN HUMIDITY........33 PERCENT.
WIND (20 FT)........NORTH AROUND 5 MPH WITH GUSTS TO AROUND
14 MPH.
MIXING HEIGHT.......MAX 3800 FT AGL.
TRANSPORT WINDS.....NORTH 10 TO 14 MPH.
MAX ADI.............64.
INVERSION END.......1000
TIME (EDT) 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........31 26 8 2 1 2 0 2 2
WEATHER TYPE....
TSTM COV........
CHC OF PCPN (%).0 0 0 0 0 0 0 0 0
TEMP............52 58 62 66 69 71 72 73 71
RH..............100 88 70 56 46 38 34 33 38
20 FT WIND DIR..N N N N N N N N N
20 FT WIND SPD..4 4 5 5 4 4 4 4 3
20 FT WIND GUST.13 14 14 14 13 13 13 11 11
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
WEDNESDAY NIGHT
SKY/WEATHER.........CLEAR.
CHANCE OF PCPN......0 PERCENT.
MIN TEMPERATURE.....AROUND 47.
MAX HUMIDITY........91 PERCENT.
WIND (20 FT)........LIGHT WINDS.
MAX LVORI...........7.
MIN ADI.............1.
INVERSION BEGIN.....1900
TIME (EDT) 6 PM 8 PM 10 PM MIDNGT 2 AM 4 AM
SKY (%).........2 4 2 1 1 0
WEATHER TYPE....NONE NONE NONE NONE NONE NONE
TSTM COV........
CHC OF PCPN (%).0 0 0 0 0 0
TEMP............68 60 56 53 51 49
RH..............42 60 72 80 86 89
20 FT WIND......N 2 N 1 N 0 N 0 N 0 N 1
20 FT WIND GUST.7 7 4 4 5 5
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 73.
MIN HUMIDITY........35 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.......1000
TIME (EDT) 6 AM 9 AM NOON 3 PM
SKY (%).........1 0 0 1
WEATHER TYPE....NONE NONE NONE NONE
TSTM COV........
CHC OF PCPN (%).0 0 0 0
TEMP............49 50 67 73
RH..............91 86 47 36
20 FT WIND......N 1G7 N 1G7 N 3G11 N 3G9
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...DIXON
REQUESTED BY...WILL MCCANN
TYPE OF REQUEST...PRESCRIBED
.TAG 2624125.0/CHS
.DELDT 10/20/26
.FORMATTERVERSION 2.0.0
.EMAIL WILLIAM.MCCANN@USDA.GOV,KELLY.WETZELWILSON@USDA.GOV
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