National Weather Service United States Department of Commerce

Print This Forecast (Printer-Friendly)

EXPERIMENTAL...FIRE WEATHER POINT FORECAST MATRICES
NATIONAL WEATHER SERVICE Blacksburg VA
131 AM EDT Tue Aug 18 2026

VAZ018-190800-
RAWS 444002
37.56N  80.18W Elev. 2702 ft
131 AM EDT Tue Aug 18 2026

Date           08/17/26      Tue 08/18/26            Wed 08/19/26            Thu
UTC 3hrly     21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12
EDT 3hrly     17 20 23 02 05 08 11 14 17 20 23 02 05 08 11 14 17 20 23 02 05 08

MIN/MAX TEMP                 68          82          62          84          67
TEMP                   71 70 71 78 81 80 73 69 66 63 64 76 82 83 76 72 70 69 69
DEWPT                  70 69 69 69 68 66 65 63 62 60 61 62 61 61 63 63 63 62 64
MIN/MAX RH                   99          61          92          47          85
RH                     97 97 93 74 65 62 76 81 87 90 90 62 49 47 64 73 78 78 84
WIND DIR               NW NW NW NW NW NW NW NW NW NW NW NW NW NW NW  W  W  W  W
WIND SPD                5  5  5  5  5  6  5  4  3  3  2  3  5  5  4  2  1  1  1
WIND GUST                    16          16                                    
CLOUDS                 B1 SC SC SC SC SC FW FW CL FW FW CL CL SC SC FW FW FW SC
CLOUDS(%)              64 30 45 46 39 27  6 11  5 11 22  4  5 45 30 20 20 24 37
VSBY                   10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10  7
POP 12HR                     20           5           0           0           5
RAIN SHWRS                                                                   IS
TSTMS                                                                          
MIX HGT                <1 <1  1  3  4  4 <1 <1 <1 <1 <1  3  5  6 <1 <1 <1 <1 <1
T WIND DIR              W NW NW NW NW NW NW NW NW NW NW NW NW  W  W  W NW NW  W
T WIND SPD             10  8  8  5  5  6 14  9  4  3  2  6  9  6  4  2  1  1  2
DISPERSION             PR PR             PR VP VP VP             VP VP VP VP   
ADI                     7  4 11 22 28 36  7  4  2  2  2 28 56 49  2  1  1  1  2
MAX LVORI               6  8  5  3  2  1  4  5  5  7  6  2  1  1  3  3  4  4  5
STABILITY               E  F  A  A  A  B  F  F  G  G  A  A  A  A  F  G  G  G  A
CEILING                    None  None  None  None  None  None  None  None  None
STA PRES                  27.72 27.75 27.72 27.77 27.78 27.79 27.76 27.77 27.75


Date           08/20Fri 08/21/26Sat 08/22/26Sun 08/23/26Mon 08/24/26
UTC 6hrly     18 00 06 12 18 00 06 12 18 00 06 12 18 00 06 12 18 00
EDT 6hrly     14 20 02 08 14 20 02 08 14 20 02 08 14 20 02 08 14 20

MAX/MIN TEMP       87      66      83      65      82      63      81      61      81
TEMP          86 72 68 68 82 70 68 66 81 70 66 65 81 69 63 62 80 68
DEWPT         69 68 66 66 70 68 65 65 69 65 62 62 64 61 59 59 61 58
RH            57 87 93 93 67 93 90 97 67 84 87 90 56 76 87 90 52 70
WIND SPD          <15     <15     <15     <15     <15     <15     <15     <15     <15
AVG CLOUDS    SC B2 B1 B1 B1 OV B2 B1 B1 B1 SC SC SC SC FW FW FW SC
POP 12HR           60      40      80      50      50      10      10       5       5
RAIN SHWRS    IS NM SC IS SC  O SC IS SC SC                        
TSTMS            SC IS    IS SC IS       SC                        

$$


This product is for planning and review purposes only and is not
to be substituted for an official fire weather spot forecast. The
data displayed are calculated from a 2.5 by 2.5 km digital
database and only approximates weather conditions in highly
varying terrain. Please relay any comments you have to the NWS via
email at rnk.webmaster@noaa.gov.

Below is a weather element key for this product.
(Note...winds do not reflect local terrain effects.)

DAY 1 THROUGH 3...
MAX/MIN TEMP OR MIN/MAX TEMP(F).....Maximum/Minimum air temperature
TEMP(F).............................Air temperature
DEWPT(F)............................Dew point temperature
MIN/MAX RH OR MAX/MIN RH(%).........Maximum/Minimum humdity
RH(%)...............................Relative humidity
WIND DIR(8 POINT COMPASS)...........Wind direction
WIND SPD(MPH).......................Wind speed
CLOUDS(CATEGORY)....................Cloud cover category
     EXAMPLE: CL = CLEAR; FW = FEW; SC = Scattered; BK = Broken; OV = Overcast
CLOUDS(%)...........................Cloud cover as a percentage
VSBY................................Visibility value in statute miles
POP 12HR(%).........................Probability for accumulating precipitation
WEATHER...
   TYPE...
       RAIN...........Rain
       RAIN SHWRS.....Rain showers
       TSTMS..........Thunderstorms
       DRIZZLE........Drizzle
       SNOW...........Snow
       SNOWSHWRS......Snow showers
       SLEET..........Sleet
       FRZG RAIN......Freezing rain
       FRZG DRZL......Freezing drizzle
   COVERAGE...
       IS.............Isolated
       SC.............Scattered
       NM.............Numerous
       O..............Occasional
       S..............Slight chance
       C..............Chance
       L..............Likely
       WD.............Widespread
       D..............Definite
       AR.............Areas
       PA.............Patchy

MIX HGT(THOUSANDS OF FT AGL)........Mixing height
     Example: 6 = 6000 feet; 12 = 12000 feet; <1 = Less than 1000 foot
t WIND DIR(8 POINT COMPASS).........Transport Wind direction
T WIND SPD(MPH).....................Transport Wind speed
DISPERSION(CATEGORY)................Smoke Dispersion category
     Values: vp =Very Poor;PR = Poor; FR = Fair; GD = Good;
ADI (INDEX).........................Atmospheric Dispersion Index
MAX LVORI (INDEX)...................Low Visibility Occurrence Risk Index
STABILITY (CATEGORY)................Pasquill Turner Stability
CEILING (FT)........................Ceiling
STA PRES (INCHES MERCURY)...........Station pressure

Day 4 Through 7...
MAX/MIN TEMP OR MIN/MAX TEMP(F).....Maximum/Minimum air temperature
TEMP(F).............................Air temperature
DEWPT(F)............................Dew Point temperature
RH(%)...............................Relative Humidity
WIND SPD(MPH).......................Wind Speed
     Example: <15 = less than 15 MPH; 15> = 15 MPH or greater
AVE CLOUDS(CATEGORY)................Average Cloud Cover Category
POP 12HR(%).........................Probability for accumulating precipitation
WEATHER.............................See Day 1 through 3 weather descriptions