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EXPERIMENTAL...FIRE WEATHER POINT FORECAST MATRICES
NATIONAL WEATHER SERVICE Blacksburg VA
1101 PM EDT Fri Aug 21 2026
VAZ018-220800-
RAWS 444002
37.56N 80.18W Elev. 2702 ft
1101 PM EDT Fri Aug 21 2026
Date 08/21/26 Sat 08/22/26 Sun 08/23/26 Mon
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 64 83 63 79 57
TEMP 66 66 66 72 80 79 70 67 65 64 63 72 78 75 66 62 59 57 58
DEWPT 65 65 65 69 69 68 66 64 62 61 61 62 60 58 55 55 54 54 55
MIN/MAX RH 100 66 93 52 91
RH 97 97 97 90 69 69 87 90 90 90 93 71 54 55 68 78 83 90 90
WIND DIR N N N SE SE S NW W W W NW NW NW NW NW W W W W
WIND SPD 0 0 0 1 2 3 2 3 4 6 6 8 8 8 4 3 3 3 3
WIND GUST 17 21 24 23 20 21 17
CLOUDS B2 B2 B2 B2 B1 B1 SC SC B1 FW FW FW FW FW CL FW CL CL CL
CLOUDS(%) 85 84 78 72 53 58 35 27 57 21 13 9 8 8 3 6 2 0 3
VSBY 4 5 4 9 10 9 10 8 10 10 10 10 10 10 10 10 10 10 10
POP 12HR 70 40 30 0 0
RAIN SHWRS IS SC SC IS
TSTMS IS SC SC IS
Obvis PF PF PF
MIX HGT <1 <1 <1 2 4 3 <1 <1 <1 <1 1 3 5 6 1
T WIND DIR E E E SE W S SE SW SW W W NW NW W W
T WIND SPD 5 4 3 2 3 4 3 3 2 6 14 19 19 14 13
DISPERSION VP VP VP VP VP PR VP VP VP VP
ADI 3 2 4 6 16 17 2 2 2 3 25 81119101 6
MAX LVORI 8 8 9 6 3 3 6 7 7 6 5 3 1 1 3
STABILITY F F B B B B G G E F B B B B F
CEILING 400 700 None None None None None None
STA PRES 27.81 27.81 27.75 27.74 27.73 27.78 27.78
Date 08/24Tue 08/25/26Wed 08/26/26Thu 08/27/26Fri 08/28/26
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 79 55 82 61 84 65 83 65 85
TEMP 78 67 57 57 79 70 62 63 82 73 67 66 80 72 67 66 83 74
DEWPT 56 53 52 53 59 59 57 58 66 65 64 64 69 67 64 65 68 66
RH 47 61 83 86 50 68 84 84 58 76 90 93 69 84 90 97 61 76
WIND SPD <15 <15 <15 <15 <15 <15 <15 <15 <15
AVG CLOUDS FW FW FW FW FW SC SC FW SC B1 B1 B1 B1 B1 SC SC SC SC
POP 12HR 0 0 5 5 30 40 50 20 20
RAIN SHWRS SC SC SC SC SC IS IS
TSTMS SC IS SC IS
$$
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