199
FNUS72 KCHS 210929
FWSCHS
SPOT FORECAST FOR HORSE ISLAND WILDFIRE...USFS
NATIONAL WEATHER SERVICE CHARLESTON SC
529 AM EDT TUE JUL 21 2026
FORECAST IS BASED ON FORECAST START TIME OF 0600 EDT ON JULY 21.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.
DISCUSSION
MOSTLY DRY AND HOT CONDITIONS WILL PERSIST AGAIN TODAY,
ALTHOUGH THERE IS A RISK FOR AN ISOLATED SHOWER OR THUNDERSTORM
DURING THE LATE MORNING INTO EARLY AFTERNOON HOURS ROUGHLY
BETWEEN 11 AM AND 2 PM. RAIN CHANCES LOOK TO INCREASE
SIGNIFICANTLY ON THURSDAY AFTERNOON AS A FRONT MOVES INTO THE
AREA. AFTERNOON RELATIVE HUMIDITY VALUES WILL BE GENERALLY AROUND
45 TO 50 PERCENT THIS AFTERNOON AND WEDNESDAY AFTERNOON. THE
BIGGEST CONCERNS WILL BE THE SEABREEZE THIS AFTERNOON WHICH WILL
LIKELY REACH THE BURN SITE AROUND NOON. WIND GUSTS TO AROUND 15
TO 20 MPH WILL BE POSSIBLE BEHIND THE SEABREEZE MOSTLY OUT OF THE
SOUTH; HOWEVER, STRONGER GUSTS COULD BE MORE VARIABLE. TRANSPORT
WINDS WILL BE PREDOMINANTLY SOUTHWESTERLY BECOMING MORE SOUTHERLY
BY THE LATE AFTERNOON. WINDS SHOULD QUICKLY RELAX AROUND SUNSET AS
MORE STABLE CONIDITONS SETTLE IN OVERNIGHT WITH CONTINUED DENSE
SMOKE ISSUES POSSIBLE.
TODAY
SKY/WEATHER.........MOSTLY SUNNY. SMOKE THROUGH THE DAY. SLIGHT
CHANCE OF SHOWERS AND THUNDERSTORMS LATE IN THE
MORNING.
CHANCE OF PCPN......20 PERCENT.
MAX TEMPERATURE.....AROUND 94.
MIN HUMIDITY........52 PERCENT.
WIND (20 FT)........LIGHT WINDS BECOMING SOUTH 5 TO 11 MPH WITH
GUSTS TO AROUND 23 MPH IN THE LATE MORNING AND
AFTERNOON. GUSTY AND ERRATIC WINDS EXPECTED
NEAR THUNDERSTORMS LATE IN THE MORNING.
MIXING HEIGHT.......MAX 5100 FT AGL.
TRANSPORT WINDS.....LIGHT WINDS BECOMING SOUTHWEST 16 TO 24 MPH IN
THE LATE MORNING AND AFTERNOON.
MAX ADI.............126.
INVERSION END.......0900
TIME (EDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........23 21 13 11 25 37 50 54 43 39 31 15
WEATHER TYPE....SMK SMK SMK SMK SMK SMK SMK SMK SMK SMK SMK SMK
TSTM COV........ SCH SCH
CHC OF PCPN (%).0 10 10 10 20 20 10 10 0 0 0 0
TEMP............81 80 82 84 88 90 91 93 93 93 93 91
RH..............85 91 88 85 72 68 64 56 54 52 52 56
20 FT WIND DIR..S S SW S S SW S S S S S S
20 FT WIND SPD..3 3 3 5 6 6 8 9 9 10 11 11
20 FT WIND GUST.13 13 13 14 16 16 18 20 22 22 23 23
MIX HGT (KFT)...0.5 0.5 0.8 2.8 3.4 3.5 4.3 4.9 5.0 5.1 4.9 4.2
TRANSP WIND DIR.SW SW SW SW SW SW SW SW SW SW SW SW
TRANSP WIND SPD.4 4 4 16 16 16 20 20 20 24 24 24
LVORI...........5 6 6 4 3 1 1 1 1 1 1 1
ADI.............3 3 4 53 67 74 95 112 126 96 99 92
TONIGHT
SKY/WEATHER.........PARTLY CLOUDY THEN BECOMING MOSTLY CLOUDY.
SMOKE.
CHANCE OF PCPN......10 PERCENT.
MIN TEMPERATURE.....AROUND 80.
MAX HUMIDITY........88 PERCENT.
WIND (20 FT)........SOUTH WINDS 5 TO 11 MPH WITH GUSTS TO AROUND 22
MPH.
MAX LVORI...........5.
MIN ADI.............1.
INVERSION BEGIN.....2000
TIME (EDT) 6 PM 8 PM 10 PM MIDNGT 2 AM 4 AM
SKY (%).........20 38 30 38 47 37
WEATHER TYPE....SMOKE SMOKE SMOKE SMOKE SMOKE SMOKE
TSTM COV........
CHC OF PCPN (%).0 0 0 0 10 10
TEMP............90 85 82 83 83 81
RH..............58 70 82 80 80 85
20 FT WIND......S 11 S 9 S 8 S 7 S 6 S 5
20 FT WIND GUST.22 22 22 22 18 18
MIX HGT (FT)....3500 800 500 500 500 500
TRANSPORT WIND..S 18 S 18 S 10 S 8 S 8 S 6
LVORI...........3 3 4 4 4 5
ADI.............1 7 6 5 5 3
WEDNESDAY
SKY/WEATHER.........PARTLY SUNNY. SMOKE EARLY IN THE MORNING.
CHANCE OF PCPN......10 PERCENT.
MAX TEMPERATURE.....AROUND 94.
MIN HUMIDITY........52 PERCENT.
WIND (20 FT)........SOUTHWEST WINDS 5 TO 11 MPH WITH GUSTS TO
AROUND 23 MPH.
MIXING HEIGHT.......MAX 5700 FT AGL.
TRANSPORT WINDS.....SOUTHWEST AROUND 6 MPH INCREASING TO 18 TO 22
MPH IN THE LATE MORNING AND AFTERNOON.
MAX ADI.............113.
INVERSION END.......0900
TIME (EDT) 6 AM 9 AM NOON 3 PM
SKY (%).........66 49 39 77
WEATHER TYPE....SMOKE NONE NONE NONE
TSTM COV........
CHC OF PCPN (%).10 0 0 0
TEMP............81 84 91 93
RH..............85 82 62 54
20 FT WIND......SW 5G16 SW 7G18 SW 9G20 S 10G22
MIX HGT (FT)....500 3300 5400 5500
TRANSPORT WIND..SW 6 SW 18 SW 20 SW 22
LVORI...........5 3 1 1
ADI.............6 70 113 89
FORECASTER...BLACK
REQUESTED BY...MICHAEL LESLIE
TYPE OF REQUEST...WILDFIRE
.TAG 2617817.0/CHS
.DELDT 07/21/26
.FORMATTERVERSION 2.0.0
.EMAIL MICHAEL.C.LESLIE@USDA.GOV
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