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
101 PM EDT Wed Aug 5 2026
VAZ046-052000-
RAWS 441101
37.39N 78.80W Elev. 804 ft
101 PM EDT Wed Aug 5 2026
Date Wed 08/05/26 Thu 08/06/26 Fri 08/07/26
UTC 3hrly 09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00
EDT 3hrly 05 08 11 14 17 20 23 02 05 08 11 14 17 20 23 02 05 08 11 14 17 20
MAX/MIN TEMP 86 70 88 70 88
TEMP 85 85 79 74 73 72 72 81 87 86 80 75 73 72 72 82 88 86 80
DEWPT 75 74 74 73 72 72 72 75 75 74 74 72 72 71 72 74 74 74 74
MAX/MIN RH 70 100 65 100 63
RH 72 70 85 97 97100100 82 68 68 82 90 97 97100 77 63 68 82
WIND DIR S S S S S SW SW SW SW S SW SW SW SW SW SW SW SW SW
WIND SPD 8 8 5 4 4 5 6 8 10 10 5 5 5 5 6 8 10 10 6
WIND GUST 16
CLOUDS B1 B1 SC SC SC SC B1 FW SC FW SC SC SC SC SC SC B1 B1 B1
CLOUDS(%) 69 58 49 43 30 26 54 22 27 22 45 44 44 27 32 45 52 52 53
VSBY 10 10 10 10 9 6 10 10 10 10 10
POP 12HR 20 10 20 10 30
RAIN SHWRS SC SC SC
TSTMS SC SC SC
Obvis PF
MIX HGT 4 3 <1 <1 <1 <1 1 3 5 4 <1 <1 <1 <1 1 3 5 4 <1
T WIND DIR S S S S S SW SW SW SW SW S S SW SW SW SW SW SW SW
T WIND SPD 14 14 9 14 13 11 11 11 13 16 12 10 6 5 12 10 17 14 12
DISPERSION PR VP VP PR PR PR PR PR PR
ADI 54 50 6 10 6 5 16 46 76 73 8 7 5 3 17 39 74 58 8
MAX LVORI 3 3 5 6 8 9 5 3 1 1 4 6 7 9 5 3 1 1 4
STABILITY C C E E F F C B B B E E E F B B C C E
CEILING None None None None None None None None None
STA PRES 29.37 29.42 29.45 29.47 29.43 29.45 29.47 29.48 29.41
Date Sat 08/08/26Sun 08/09/26Mon 08/10/26Tue 08/11/26
UTC 6hrly 06 12 18 00 06 12 18 00 06 12 18 00 06 12 18 00
EDT 6hrly 02 08 14 20 02 08 14 20 02 08 14 20 02 08 14 20
MIN/MAX TEMP 69 89 69 90 69 92 71 93
TEMP 72 72 88 80 73 72 89 83 73 73 92 83 74 74 92 83
DEWPT 72 72 74 74 72 71 72 72 70 70 71 72 70 70 72 71
RH 100100 63 82 97 97 57 70 90 90 51 70 87 87 52 67
WIND SPD <15 <15 <15 <15 <15 <15 <15 <15
AVG CLOUDS B1 SC SC B1 SC SC SC SC FW FW FW SC SC SC SC SC
POP 12HR 30 30 20 5 5 5 10 20
RAIN SHWRS SC SC IS IS
TSTMS SC SC IS 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
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