132  
FNUS72 KCHS 300852  
FWSCHS  
 
SPOT FORECAST FOR FM C-75B...USFS  
NATIONAL WEATHER SERVICE CHARLESTON SC  
452 AM EDT TUE JUN 30 2020  
 
FORECAST IS BASED ON IGNITION TIME OF 0900 EDT ON JUNE 30.  
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL WEATHER  
SERVICE.  
   
DISCUSSION
 
 
WEAK LOW PRESSURE WILL LINGER OVER OR NEAR THE REGION THROUGH THE  
HOLIDAY WEEKEND. LOW PRESSURE MAY THEN IMPACT THE AREA EARLY NEXT  
WEEK.  
 
FOG POTENTIAL FOR TONIGHT: LOW  
   
REST OF TODAY
 
 
SKY/WEATHER.........PARTLY SUNNY. SLIGHT CHANCE OF SHOWERS AND  
THUNDERSTORMS EARLY IN THE AFTERNOON. CHANCE OF  
SHOWERS AND THUNDERSTORMS LATE IN THE  
AFTERNOON.  
CHANCE OF PCPN......50 PERCENT.  
MAX TEMPERATURE.....AROUND 93.  
MIN HUMIDITY........52 PERCENT.  
WIND (20 FT)........LIGHT WINDS. GUSTY AND ERRATIC WINDS EXPECTED  
NEAR THUNDERSTORMS IN THE AFTERNOON.  
MIXING HEIGHT.......MAX 5500 FT AGL.  
TRANSPORT WINDS.....WEST AROUND 6 MPH.  
MAX ADI.............37.  
INVERSION END.......0900  
 
TIME (EDT) 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........36 38 42 45 49 53 59 64 69  
WEATHER TYPE.... RW RW RW RW RW  
TSTM COV........ SCH SCH CHC CHC CHC  
CHC OF PCPN (%).10 10 10 10 20 20 30 40 50  
TEMP............82 86 88 90 90 91 93 91 88  
RH..............79 70 63 58 60 58 52 56 61  
20 FT WIND DIR..W W W W W W W W W  
20 FT WIND SPD..2 3 3 3 4 3 3 3 3  
20 FT WIND GUST.4 4 4 4 5 4 4 4 4  
MIX HGT (KFT)...1.7 2.9 4.1 4.5 5.0 5.5 4.9 4.4 3.8  
TRANSP WIND DIR.W W W W W W SW SW SW  
TRANSP WIND SPD.6 6 6 6 6 6 6 6 6  
LVORI...........4 3 1 1 2 2 2 2 2  
ADI.............9 20 33 37 28 28 29 28 27  
   
TONIGHT
 
 
SKY/WEATHER.........MOSTLY CLOUDY. CHANCE OF SHOWERS AND  
THUNDERSTORMS UNTIL EARLY MORNING, THEN SLIGHT  
CHANCE OF SHOWERS AND THUNDERSTORMS AFTER  
MIDNIGHT.  
CHANCE OF PCPN......50 PERCENT.  
MIN TEMPERATURE.....AROUND 73.  
MAX HUMIDITY........97 PERCENT.  
WIND (20 FT)........LIGHT WINDS. GUSTY AND ERRATIC WINDS EXPECTED  
NEAR THUNDERSTORMS UNTIL EARLY MORNING.  
MAX LVORI...........8.  
MIN ADI.............1.  
INVERSION BEGIN.....2000  
 
TIME (EDT) 6 PM 8 PM 10 PM MIDNGT 2 AM 4 AM  
SKY (%).........72 73 73 72 71 72  
WEATHER TYPE....RNSHWR RNSHWR RNSHWR RNSHWR RNSHWR NONE  
TSTM COV........CHANCE CHANCE CHANCE CHANCE S CHC  
CHC OF PCPN (%).50 50 50 40 20 10  
TEMP............87 81 76 75 74 74  
RH..............65 82 94 94 97 93  
20 FT WIND......N 3 W 3 NW 2 NW 2 W 2 W 2  
20 FT WIND GUST.4 4 4 4 4 4  
MIX HGT (FT)....2700 600 400 200 100 200  
TRANSPORT WIND..SW 6 SW 6 NW 4 W 2 W 2 W 2  
LVORI...........3 5 7 7 8 7  
ADI.............20 1 1 1 1 1  
   
WEDNESDAY
 
 
SKY/WEATHER.........PARTLY SUNNY. SLIGHT CHANCE OF SHOWERS AND  
THUNDERSTORMS LATE IN THE MORNING. CHANCE OF  
SHOWERS AND THUNDERSTORMS EARLY IN THE  
AFTERNOON.  
CHANCE OF PCPN......50 PERCENT.  
MAX TEMPERATURE.....AROUND 91.  
MIN HUMIDITY........56 PERCENT.  
WIND (20 FT)........LIGHT WINDS BECOMING WEST 5 TO 6 MPH IN THE  
AFTERNOON. GUSTY AND ERRATIC WINDS EXPECTED  
NEAR THUNDERSTORMS LATE IN THE MORNING.  
MIXING HEIGHT.......MAX 6000 FT AGL.  
TRANSPORT WINDS.....LIGHT WINDS BECOMING WEST 6 TO 10 MPH IN THE  
LATE MORNING AND AFTERNOON.  
MAX ADI.............36.  
INVERSION END.......0900  
 
TIME (EDT) 6 AM 9 AM NOON 3 PM  
SKY (%).........70 58 55 62  
WEATHER TYPE....NONE NONE RNSHWR RNSHWR  
TSTM COV........ S CHC CHANCE  
CHC OF PCPN (%).10 10 20 40  
TEMP............73 79 88 91  
RH..............97 82 61 56  
20 FT WIND......W 2G4 W 3G4 W 4G5 W 6G9  
MIX HGT (FT)....300 1500 4300 6000  
TRANSPORT WIND..W 4 NW 6 W 10 W 10  
LVORI...........8 4 2 1  
ADI.............1 11 26 36  
 

 
FORECASTER...DIXON  
REQUESTED BY...PAUL CHURCHILL  
TYPE OF REQUEST...PRESCRIBED  
.TAG 2008705.1/CHS  
.DELDT 06/30/20  
.EMAIL PAUL.CHURCHILL@USDA.GOV  
 
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