293
FNUS72 KCHS 191813
FWSCHS
SPOT FORECAST FOR FMF C-121 #18 PLANNING...USFS
NATIONAL WEATHER SERVICE CHARLESTON SC
113 PM EST MON JAN 19 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 ACROSS THE AREA TUESDAY, BRINGING DRY
CONDITIONS AND LIGHT WINDS. THE TEMPERATURE SHOULD RISE ABOVE 40
DEGREES AROUND 11 AM TUESDAY. THE MINIMUM RH WILL BE AROUND 33
PERCENT. SURFACE WINDS WILL START FROM THE NORTH IN THE MORNING,
THEN BACK SLIGHTLY TO THE NORTHWEST IN THE AFTERNOON. THE VENTILATION
RATE SHOULD PEAK AROUND 25,000 IN THE AFTERNOON.
TUESDAY
SKY/WEATHER.........MOSTLY SUNNY.
CHANCE OF PCPN......0 PERCENT.
MAX TEMPERATURE.....AROUND 48.
MIN HUMIDITY........AROUND 33 PERCENT.
WIND (20 FT)........LIGHT NORTHWEST TO NORTH WINDS.
MIXING HEIGHT.......MAX 3100 FT AGL.
TRANSPORT WINDS.....NORTH 6 TO 8 MPH.
MAX ADI.............31.
INVERSION END.......10 AM.
TIME (EST) 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........23 17 24 33 40 45 46 50
WEATHER TYPE....
TSTM COV........
CHC OF PCPN (%).0 0 0 0 0 0 0 0
TEMP............37 41 44 46 48 48 47 43
RH..............52 42 36 34 33 33 35 43
20 FT WIND DIR..N N N N NW NW N N
20 FT WIND SPD..2 2 2 2 2 2 2 1
20 FT WIND GUST.7 9 9 9 9 7 9 5
MIX HGT (KFT)...1.4 2.0 2.5 2.9 3.1 3.1 3.0 0.9
TRANSP WIND DIR.N N NW NW NW N N N
TRANSP WIND SPD.8 8 8 8 8 6 6 6
LVORI...........2 2 2 2 1 1 2 2
ADI.............15 21 26 29 31 31 30 4
TUESDAY NIGHT
SKY/WEATHER.........PARTLY CLOUDY.
CHANCE OF PCPN......0 PERCENT.
MIN TEMPERATURE.....AROUND 24.
MAX HUMIDITY........AROUND 92 PERCENT.
WIND (20 FT)........LIGHT NORTH WINDS IN THE EVENING BECOMING
NORTHEAST AFTER MIDNIGHT.
MAX LVORI...........8.
MIN ADI.............1.
INVERSION BEGIN.....6 PM.
TIME (EST) 6 PM 8 PM 10 PM MIDNGT 2 AM 4 AM
SKY (%).........35 22 19 18 17 17
WEATHER TYPE....NONE NONE NONE NONE NONE NONE
TSTM COV........
CHC OF PCPN (%).0 0 0 0 0 0
TEMP............38 31 28 26 26 25
RH..............52 72 85 88 85 88
20 FT WIND......N 1 NE 1 NE 1 NE 1 NE 1 NE 2
20 FT WIND GUST.5 4 5 4 5 5
MIX HGT (FT)....400 400 400 400 400 400
TRANSPORT WIND..N 2 N 2 NE 2 NE 2 NE 2 NE 2
LVORI...........2 4 6 6 6 6
ADI.............1 1 1 1 1 1
WEDNESDAY
SKY/WEATHER.........MOSTLY SUNNY THEN BECOMING MOSTLY CLOUDY.
CHANCE OF PCPN......0 PERCENT.
MAX TEMPERATURE.....AROUND 56.
MIN HUMIDITY........57 PERCENT.
WIND (20 FT)........LIGHT WINDS.
MIXING HEIGHT.......MAX 2900 FT AGL.
TRANSPORT WINDS.....LIGHT WINDS BECOMING EAST 8 TO 10 MPH IN THE
LATE MORNING AND AFTERNOON.
MAX ADI.............37.
INVERSION END.......10 AM.
TIME (EST) 6 AM 9 AM NOON 3 PM
SKY (%).........19 26 50 73
WEATHER TYPE....NONE NONE NONE NONE
TSTM COV........
CHC OF PCPN (%).0 0 0 0
TEMP............24 35 51 56
RH..............88 75 61 59
20 FT WIND......NE 2G5 NE 2G7 E 2G9 E 2G7
MIX HGT (FT)....400 1000 2400 2500
TRANSPORT WIND..NE 2 E 10 SE 10 SE 8
LVORI...........6 4 1 2
ADI.............1 8 31 23
FORECASTER...STROZ
REQUESTED BY...KELLY WETZEL
TYPE OF REQUEST...PRESCRIBED
.TAG 2600500.0/CHS
.DELDT 01/19/26
.FORMATTERVERSION 2.0.0
.EMAIL KELLY.WETZELWILSON@USDA.GOV
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