824  
FNUS71 KRNK 230911  
FWSRNK  
 
SPOT FORECAST FOR WHETSTONE RIDGE...US FOREST SERVICE  
NATIONAL WEATHER SERVICE BLACKSBURG VA  
511 AM EDT WED JUL 23 2025  
 
FORECAST IS BASED ON FORECAST START TIME OF 0600 EDT ON JULY 23.  
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL WEATHER  
SERVICE.  
   
DISCUSSION  
 
HIGH PRESSURE WILL BUILD INTO THE AREA FROM THE NORTHEAST  
PROVIDING SLIGHTLY COOLER AND LESS HUMID CONDITIONS THROUGH  
THURSDAY. THIS SHOULD ALSO KEEP THE SHOWER THREAT TO A MINIMUM.  
AFTER THURSDAY, THE HEAT AND HUMIDITY BUILDS AGAIN FOR THE  
WEEKEND, ALONG WITH A CHANCE OF THUNDERSTORMS.  
 
MIN RH THROUGH THE DAYTIME TODAY AND THURSDAY GENERALLY IN  
THE 50 PERCENT RANGE. WINDS WILL REMAIN LIGHT OUT OF THE  
SOUTH/SOUTHEAST.  
 
   
TODAY  
 
SKY/WEATHER.........MOSTLY SUNNY (35-45 PERCENT).  
CWR (0.01 IN).......0 PERCENT.  
MAX TEMPERATURE.....AROUND 83.  
MIN HUMIDITY........55 PERCENT.  
WIND (20 FT)........LIGHT WINDS.  
MIXING HEIGHT.......5200 FT AGL.  
MIXING WINDS........SOUTHEAST 3 TO 8 MPH.  
SMOKE DISPERSAL.....POOR (1500 KNOT-FT) EARLY IN THE MORNING  
INCREASING TO GOOD (30900 KNOT-FT) IN THE  
AFTERNOON.  
LVORI...............3.  
ADI.................3 EARLY IN THE MORNING INCREASING TO 44 IN THE  
AFTERNOON.  
 
TIME (EDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........57 55 55 53 27 24 29 31 25 34 23 22  
WEATHER COV.....  
WEATHER TYPE....  
TSTM COV........  
CWR.............0 0 0 0 0 0 0 0 0 0 0 0  
TEMP............65 66 68 72 74 77 78 79 81 81 82 81  
RH..............86 87 84 75 70 65 62 59 56 56 55 56  
20 FT WIND DIR..SE SE SE S S SE SE SE SE SE SE SE  
20 FT WIND SPD..4 3 1 1 2 2 2 3 3 3 3 3  
20 FT WIND GUST.6 6 4 4 5 6 6 7 8 8 7 8  
MIX HGT (KFT)...0.5 0.5 0.7 1.8 2.7 3.6 4.2 4.8 5.1 5.2 5.2 5.1  
MIXNG WIND DIR..E SE SE SE SE SE SE SE SE SE SE SE  
MIXNG WIND SPD..3 5 6 7 8 8 8 7 7 7 7 7  
LVORI...........5 5 4 4 3 3 1 1 1 1 1 1  
ADI.............3 5 6 15 26 37 42 44 44 43 43 44  
VRATE MPH-FT/1K.2 2 4 12 20 29 33 36 35 35 35 35  
   
TONIGHT  
 
SKY/WEATHER.........MOSTLY CLEAR (10-20 PERCENT).  
CWR (0.01 IN).......0 PERCENT.  
MIN TEMPERATURE.....AROUND 64.  
MAX HUMIDITY........91 PERCENT.  
WIND (20 FT)........LIGHT WINDS.  
MIXING HEIGHT.......500 FT AGL.  
MIXING WINDS........SOUTHEAST 5 TO 9 MPH.  
SMOKE DISPERSAL.....FAIR (26400 KNOT-FT) EARLY IN THE EVENING  
DECREASING TO POOR (2100 KNOT-FT) LATE IN THE  
NIGHT.  
LVORI...............4.  
ADI.................2 TO 39.  
 
TIME (EDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM  
SKY (%).........17 19 6 7 8 9 17 16 25 15 24 22  
WEATHER COV.....  
WEATHER TYPE....  
TSTM COV........  
CWR.............0 0 0 0 0 0 0 0 0 0 0 0  
TEMP............80 78 75 74 72 70 69 68 67 67 66 65  
RH..............58 64 69 70 75 75 80 83 86 86 88 89  
20 FT WIND DIR..SE SE SE SE SE SE SE SE S S S S  
20 FT WIND SPD..2 2 2 2 2 2 2 2 2 1 1 1  
20 FT WIND GUST.8 8 7 6 6 6 6 5 5 5 5 5  
MIX HGT (KFT)...3.9 1.5 0.6 0.5 0.5 0.5 0.5 0.6 0.6 0.6 0.6 0.7  
MIXNG WIND DIR..SE SE SE SE SE SE SE SE SE S S S  
MIXNG WIND SPD..8 9 9 8 6 5 6 8 9 8 6 5  
LVORI...........1 3 3 3 3 4 4 5 5 6 6 6  
ADI.............39 4 4 3 3 2 3 4 4 4 3 2  
VRATE MPH-FT/1K.30 13 6 4 3 2 3 5 6 5 4 3  
   
THURSDAY  
 
SKY/WEATHER.........SUNNY (15-25 PERCENT).  
CWR (0.01 IN).......0 PERCENT.  
MAX TEMPERATURE.....AROUND 86.  
MIN HUMIDITY........54 PERCENT.  
WIND (20 FT)........LIGHT WINDS.  
MIXING HEIGHT.......4600 FT AGL.  
MIXING WINDS........SOUTH 5 TO 8 MPH.  
SMOKE DISPERSAL.....POOR (1900 KNOT-FT) EARLY IN THE MORNING  
INCREASING TO GOOD (32100 KNOT-FT) IN THE  
AFTERNOON.  
LVORI...............4.  
ADI.................2 EARLY IN THE MORNING INCREASING TO 46 IN THE  
AFTERNOON.  
 
TIME (EDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........26 29 31 26 19 12 13 14 15 14 14 13  
WEATHER COV.....  
WEATHER TYPE....  
TSTM COV........  
CWR.............0 0 0 0 0 0 0 0 0 0 0 0  
TEMP............64 66 69 72 75 78 80 83 84 85 84 84  
RH..............91 90 86 81 75 69 63 58 55 54 54 55  
20 FT WIND DIR..S S SW SW SW SW SW SW S S S S  
20 FT WIND SPD..1 1 1 1 1 2 3 3 3 3 3 3  
20 FT WIND GUST.5 5 5 5 6 6 7 7 7 7 8 8  
MIX HGT (KFT)...0.5 0.5 1.2 1.8 2.2 3.0 3.3 3.8 4.3 4.4 4.5 4.6  
MIXNG WIND DIR..S S S S SW SW S S S S S SW  
MIXNG WIND SPD..5 5 5 5 6 6 6 7 7 7 8 8  
LVORI...........7 6 5 4 4 3 2 1 1 1 1 1  
ADI.............2 4 7 11 15 22 26 32 37 41 44 46  
VRATE MPH-FT/1K.2 2 5 9 12 17 20 25 30 32 35 37  
 
 
FORECASTER...GRUVER  
REQUESTED BY...ETHAN SMITH  
TYPE OF REQUEST...WILDFIRE  
.TAG 2518437.0/RNK  
.DELDT 07/23/25  
.FORMATTERVERSION 2.0.0  
.EMAIL ETHAN.SMITH2@USDA.GOV  
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