638
FNUS72 KCHS 200924
FWSCHS
SPOT FORECAST FOR FMF C-121 #18...USDA FOREST SERVICE
NATIONAL WEATHER SERVICE CHARLESTON SC
424 AM EST TUE JAN 20 2026
FORECAST IS BASED ON IGNITION TIME OF 1000 EST ON JANUARY 20.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.
DISCUSSION
HIGH PRESSURE WILL PREVAIL THROUGH THE MIDDLE OF THE WEEK. RH VALUES
WILL DROP TO AROUND 40% THIS AFTERNOON, BUT NORTHWEST SURFACE WINDS
WILL BE FAIRLY LIGHT. RH VALUES RECOVER TUESDAY NIGHT AND TREND UPWARD
ON WEDNESDAY WITH A LIGHT EASTERLY SURFACE WIND OCCURRING DURING THE DAY.
REST OF TODAY
SKY/WEATHER.........MOSTLY SUNNY.
CHANCE OF PCPN......0 PERCENT.
MAX TEMPERATURE.....AROUND 49.
MIN HUMIDITY........37 PERCENT.
WIND (20 FT)........LIGHT WINDS.
MIXING HEIGHT.......MAX 3200 FT AGL.
TRANSPORT WINDS.....NORTHWEST AROUND 8 MPH IN THE LATE MORNING AND
EARLY AFTERNOON BECOMING LIGHT.
MAX ADI.............27.
INVERSION END.......1000.
TIME (EST) 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........39 31 37 31 36 32 26 24
WEATHER TYPE....
TSTM COV........
CHC OF PCPN (%).0 0 0 0 0 0 0 0
TEMP............40 43 45 47 48 48 49 46
RH..............52 47 45 40 39 39 37 45
20 FT WIND DIR..N N N NW NW NW NW N
20 FT WIND SPD..2 2 2 2 2 2 2 1
20 FT WIND GUST.7 7 7 7 7 5 7 5
MIX HGT (KFT)...1.3 1.9 2.5 3.0 3.2 3.1 3.0 0.8
TRANSP WIND DIR.N N NW NW NW NW NW NW
TRANSP WIND SPD.8 8 8 8 8 4 4 4
LVORI...........2 2 2 2 2 2 2 2
ADI.............14 20 25 26 27 27 26 1
TONIGHT
SKY/WEATHER.........MOSTLY CLEAR.
CHANCE OF PCPN......0 PERCENT.
MIN TEMPERATURE.....AROUND 27.
MAX HUMIDITY........81 PERCENT.
WIND (20 FT)........LIGHT WINDS.
MAX LVORI...........6.
MIN ADI.............1.
INVERSION BEGIN.....1700.
TIME (EST) 6 PM 8 PM 10 PM MIDNGT 2 AM 4 AM
SKY (%).........18 7 7 20 21 14
WEATHER TYPE....NONE NONE NONE NONE NONE NONE
TSTM COV........
CHC OF PCPN (%).0 0 0 0 0 0
TEMP............42 35 32 29 29 29
RH..............55 72 75 78 78 78
20 FT WIND......N 1 NE 1 NE 1 NE 1 NE 1 NE 2
20 FT WIND GUST.4 5 5 5 5 7
MIX HGT (FT)....400 400 400 400 400 400
TRANSPORT WIND..N 2 N 2 NE 2 NE 2 NE 2 NE 2
LVORI...........3 4 4 4 4 4
ADI.............1 1 1 1 1 1
WEDNESDAY
SKY/WEATHER.........MOSTLY SUNNY THEN BECOMING MOSTLY CLOUDY.
CHANCE OF PCPN......0 PERCENT.
MAX TEMPERATURE.....AROUND 57.
MIN HUMIDITY........59 PERCENT.
WIND (20 FT)........LIGHT WINDS.
MIXING HEIGHT.......MAX 3100 FT AGL.
TRANSPORT WINDS.....LIGHT WINDS BECOMING EAST AROUND 6 MPH LATE IN
THE MORNING, THEN SHIFTING TO THE SOUTHEAST 6
TO 8 MPH IN THE AFTERNOON.
MAX ADI.............31.
INVERSION END.......1030.
TIME (EST) 6 AM 9 AM NOON 3 PM
SKY (%).........20 30 48 73
WEATHER TYPE....NONE NONE NONE NONE
TSTM COV........
CHC OF PCPN (%).0 0 0 0
TEMP............28 37 53 57
RH..............81 75 61 62
20 FT WIND......NE 2G7 NE 2G9 E 3G9 E 1G7
MIX HGT (FT)....400 600 2600 2400
TRANSPORT WIND..NE 2 E 6 SE 8 SE 6
LVORI...........5 4 2 2
ADI.............2 2 26 19
FORECASTER...BERRY
REQUESTED BY...KELLY WETZEL WILSON
TYPE OF REQUEST...PRESCRIBED
.TAG 2600532.0/CHS
.DELDT 01/20/26
.FORMATTERVERSION 2.0.0
.EMAIL KELLY.WETZELWILSON@USDA.GOV
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