123  
FNUS72 KCHS 181137  
FWSCHS  
 
SPOT FORECAST FOR C87W FMF...USFS  
NATIONAL WEATHER SERVICE CHARLESTON SC  
737 AM EDT WED JUL 18 2018  
 
FORECAST IS BASED ON IGNITION TIME OF 1000 EDT ON JULY 18.  
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL WEATHER  
SERVICE.  
   
DISCUSSION
 
 
A COLD FRONT WILL APPROACH THE REGION FROM THE NORTHWEST TODAY,  
THEN STALL OVER OR NEARBY OUR AREA THROUGH THURSDAY NIGHT. THE  
FRONT WILL SLOWLY LIFT NORTH ON FRIDAY. ANOTHER COLD FRONT SHOULD  
APPROACH FROM THE NORTHWEST EARLY NEXT WEEK.  
 
FOG POTENTIAL FOR TONIGHT: LOW.  
   
REST OF TODAY
 
 
SKY/WEATHER.........MOSTLY CLOUDY. ISOLATED SHOWERS AND  
THUNDERSTORMS THROUGH MID DAY. SHOWERS  
AND THUNDERSTORMS LIKELY LATE IN THE AFTERNOON.  
CHANCE OF PCPN......60 PERCENT.  
MAX TEMPERATURE.....AROUND 89.  
MIN HUMIDITY........66 PERCENT.  
WIND (20 FT)........SOUTHWEST WINDS 5 TO 6 MPH. GUSTY AND ERRATIC  
WINDS EXPECTED NEAR THUNDERSTORMS.  
MIXING HEIGHT.......MAX 3800 FT AGL.  
TRANSPORT WINDS.....WEST 10 TO 12 MPH.  
MAX ADI.............29.  
INVERSION END.......0900  
 
TIME (EDT) 10A 11A 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........63 65 69 74 80 84 85 85  
WEATHER TYPE....RW RW RW RW RW RW RW RW  
TSTM COV........SCH SCH SCH SCH CHC CHC CHC LKY  
CHC OF PCPN (%).20 20 20 20 30 50 50 60  
TEMP............83 86 88 89 89 89 88 86  
RH..............77 72 68 66 66 66 66 70  
20 FT WIND DIR..W W W W W W W SW  
20 FT WIND SPD..5 5 5 6 6 6 5 5  
20 FT WIND GUST. 7 7 7 7  
MIX HGT (KFT)...1.9 2.4 2.8 3.3 3.7 3.7 3.8 3.8  
TRANSP WIND DIR.W W W W W W W W  
TRANSP WIND SPD.10 10 12 12 12 10 10 10  
LVORI...........5 5 4 4 3 4 4 5  
ADI.............15 18 22 26 29 25 20 15  
   
TONIGHT
 
 
SKY/WEATHER.........MOSTLY CLOUDY. SHOWERS AND THUNDERSTORMS LIKELY  
EARLY IN THE EVENING, THEN CHANCE OF SHOWERS  
AND THUNDERSTORMS IN THE LATE EVENING AND  
OVERNIGHT.  
CHANCE OF PCPN......60 PERCENT.  
MIN TEMPERATURE.....AROUND 72.  
MAX HUMIDITY........100 PERCENT.  
WIND (20 FT)........SOUTHWEST WINDS AROUND 5 MPH EARLY IN THE  
EVENING BECOMING LIGHT. GUSTY AND ERRATIC WINDS  
EXPECTED NEAR THUNDERSTORMS.  
MAX LVORI...........10.  
MIN ADI.............1.  
INVERSION BEGIN.....2000  
 
TIME (EDT) 6 PM 10 PM 2 AM  
SKY (%).........83 73 60  
WEATHER TYPE....RNSHWR RNSHWR RNSHWR  
TSTM COV........LIKELY CHANCE CHANCE  
CHC OF PCPN (%).60 40 30  
TEMP............84 76 74  
RH..............74 94 100  
20 FT WIND......SW 5 NW 1G2 NE 2  
MIX HGT (FT)....2800 700 700  
TRANSPORT WIND..NW 6 N 2 NE 2  
LVORI...........5 7 10  
ADI.............11 1 1  
   
THURSDAY
 
 
SKY/WEATHER.........MOSTLY CLOUDY. SHOWERS LIKELY AND CHANCE OF  
THUNDERSTORMS.  
CHANCE OF PCPN......60 PERCENT.  
MAX TEMPERATURE.....AROUND 87.  
MIN HUMIDITY........63 PERCENT.  
WIND (20 FT)........LIGHT WINDS BECOMING EAST 5 TO 8 MPH IN THE  
LATE MORNING AND AFTERNOON. GUSTY AND ERRATIC  
WINDS EXPECTED NEAR THUNDERSTORMS.  
MIXING HEIGHT.......MAX 4100 FT AGL.  
TRANSPORT WINDS.....LIGHT WINDS BECOMING EAST 12 TO 14 MPH IN THE  
LATE MORNING AND AFTERNOON.  
MAX ADI.............34.  
INVERSION END.......0900  
 
TIME (EDT) 6 AM 10 AM 2 PM  
SKY (%).........60 70 78  
WEATHER TYPE....RNSHWR RNSHWR RNSHWR  
TSTM COV........CHANCE CHANCE CHANCE  
CHC OF PCPN (%).40 50 60  
TEMP............72 82 87  
RH..............100 77 63  
20 FT WIND......NE 3G4 E 6G9 E 7G11  
MIX HGT (FT)....500 2500 4100  
TRANSPORT WIND..NE 4 E 12 E 14  
LVORI...........9 6 1  
ADI.............3 14 34  
 

 
FORECASTER...DIXON  
REQUESTED BY...KELLY WETZEL  
TYPE OF REQUEST...PRESCRIBED  
.TAG 1813021.0/CHS  
.DELDT 07/18/18  
.EMAIL KWETZELWILSON@FS.FED.US  
 
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