National Weather Service United States Department of Commerce

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Experimental...Fire Weather Planning forecast for VA Natl Forests
NATIONAL WEATHER SERVICE Blacksburg VA
404 AM EDT Sat Oct 21 2017

.DISCUSSION...

...Dry weather through the weekend to give way to widespread
rainfall early next week... 

The influence of high pressure over the area will continue to 
maintain dry conditions across the region this weekend. A strong 
cold front will approach and then cross the region Monday through 
Tuesday, bringing good coverage of showers and some gusty winds. 
High pressure returns to the area by the latter half of the upcoming 
week.

Minimum relative humidity values will be in the 30 percent to 40 percent 
range, then steadily increase to well above 50 percent by Monday. Light
transport winds and a relatively shallow mixing height will create poor
dispersion and ventilation conditions into the weekend, but improving
conditions are expected as winds increase ahead of the approaching cold
front. Rainfall amounts of one half inch east of the Blue Ridge to two 
inches in the mountains are possible from Monday into Tuesday.

VAZ007-009>015-212100-
JEFFERSON NATIONAL FOREST South Zone-
INCLUDING Blacksburg, Wythe, and Mt Rogers
404 AM EDT Sat Oct 21 2017

                      Today        Tonight      Sun          

Cloud cover           MClear       MClear       MClear       
Precip type           None         None         None         
Chance precip (%)     0            0            0            
Min/Max Temp          74           47           72           
Max/Min RH %          39           92           45           
Wnd20ft2min/Early(mph)Lgt/Var      Lgt/Var      Lgt/Var      
Wnd20ft2min/Late(mph) S  5         Lgt/Var      S  6         
Precip amount         0.00         0.00         0.00         
Precip duration                                              
Precip begin                                                 
Precip end                                                   
Mixing hgt(ft-AGL)    4780                      4070         
Transport wnd (mph)   S  8                      SE 14        
Vent rate (mph-ft)    38240                     56980        
Dispersion(evening)                POOR                      
LAL                   1            1            1            
Haines Index          3            3            5            
ADI early             7 POOR       29 FAIR      22 FAIR      
ADI late              28 FAIR      4 VERY POOR  40 FAIR      
Max LVORI early       6            3            5            
Max LVORI late        2            5            2            

REMARKS...None.

.FORECAST FOR DAYS 3 THROUGH 7...
.SUNDAY NIGHT AND MONDAY...Mostly cloudy. Showers likely. Lows in
the lower 50s. Highs in the upper 60s. Minimum RH 72 percent.
Southeast winds 10 to 15 mph. 
.MONDAY NIGHT AND TUESDAY...Showers. Lows in the mid 50s. Highs
in the lower 60s. Minimum RH 61 percent. Southwest winds 15 to
20 mph. 
.TUESDAY NIGHT AND WEDNESDAY...Mostly cloudy. A chance of rain
showers. Cooler. Lows around 40. Highs in the lower 50s. Minimum
RH 54 percent. West winds 15 to 20 mph. 
.WEDNESDAY NIGHT AND THURSDAY...Partly cloudy. Lows in the mid
30s. Highs in the mid 50s. Minimum RH 46 percent. West winds
10 to 15 mph. 
.THURSDAY NIGHT AND FRIDAY...Mostly clear. Lows in the lower 40s.
Highs around 60. Minimum RH 46 percent. Southwest winds 5 to
10 mph. 

$$

.OUTLOOK 8 TO 14 DAYS...
Temperatures near normal.  Precipitation near normal.

$$