
A series of fronts will focus locally heavy showers and storms across portions of the central and eastern U.S. through the end of the workweek. Dangerous to extreme heat continues across the Southwest U.S., eventually spreading eastward over the weekend into early next week. Elevated fire weather conditions continue across the Great Basin, with degraded air quality lingering across the Northwest. Read More >
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EXPERIMENTAL...FIRE WEATHER POINT FORECAST MATRICES
NATIONAL WEATHER SERVICE Blacksburg VA
831 PM EDT Tue Aug 4 2026
VAZ046-050800-
RAWS 441101
37.39N 78.80W Elev. 804 ft
831 PM EDT Tue Aug 4 2026
Date 08/04/26 Wed 08/05/26 Thu 08/06/26 Fri
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 71 85 70 88 70
TEMP 72 71 71 71 77 83 84 78 74 73 71 72 81 87 86 80 75 73 70 72
DEWPT 72 71 71 71 76 76 75 75 74 73 71 72 75 75 74 74 73 72 70 72
MIN/MAX RH 100 74 100 66 100
RH 100100100100 97 80 74 91100100100100 82 68 68 82 94 97100100
WIND DIR E NE NE SE S S S S SW S SW SW SW SW SW SW SW SW SW SW
WIND SPD 3 2 2 2 3 5 6 5 6 5 5 6 9 10 10 6 5 5 5 6
CLOUDS B2 B2 B2 B2 B2 B1 SC SC SC FW CL FW SC SC B1 SC SC SC SC SC
CLOUDS(%) 87 83 83 72 79 58 46 42 31 22 4 20 36 38 52 39 41 30 40 44
VSBY 8 2 1 4 10 10 10 10 10 8 10
POP 12HR 60 30 20 20 10
RAIN SHWRS SC SC IS IS IS IS IS IS
TSTMS SC IS IS IS IS
Obvis PF PF PF
MIX HGT <1 <1 <1 <1 2 4 3 <1 <1 <1 <1 1 3 5 3 <1
T WIND DIR E NE N SW SW SW SW S S S SW SW SW SW SW SW
T WIND SPD 8 6 4 1 4 12 14 14 5 5 4 12 12 12 14 17
DISPERSION VP VP VP PR PR PR PR PR PR PR PR
ADI 4 3 2 1 13 46 49 7 3 4 2 18 50 72 52 8
MAX LVORI 9 9 9 10 5 3 3 5 9 9 9 5 3 1 1 4
STABILITY F F F B C C C F F E F B B B C F
CEILING 700 400 900 None None None None None None
STA PRES 29.35 29.36 29.39 29.38 29.42 29.45 29.46 29.43
Date 08/07Sat 08/08/26Sun 08/09/26Mon 08/10/26Tue 08/11/26
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 88 69 89 69 89 70 92 71 93
TEMP 87 82 72 72 87 80 71 71 87 82 73 72 89 84 74 73 90 84
DEWPT 74 74 72 72 74 74 71 71 73 73 70 70 72 72 70 70 72 72
RH 65 77100100 65 82100100 63 74 90 93 57 67 87 90 56 67
WIND SPD <15 <15 <15 <15 <15 <15 <15 <15 <15
AVG CLOUDS SC SC B1 SC SC B1 SC SC SC SC FW FW SC FW FW SC SC SC
POP 12HR 20 10 30 10 10 5 10 10 20
RAIN SHWRS IS SC IS
TSTMS 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