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EXPERIMENTAL...FIRE WEATHER POINT FORECAST MATRICES
NATIONAL WEATHER SERVICE Blacksburg VA
531 AM EDT Thu Aug 20 2026
VAZ046-202000-
RAWS 441101
37.39N 78.80W Elev. 804 ft
531 AM EDT Thu Aug 20 2026
Date Thu 08/20/26 Fri 08/21/26 Sat 08/22/26
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 92 67 82 67 86
TEMP 71 86 91 88 79 73 71 69 69 75 80 81 74 71 69 68 69 76 84 86 78
DEWPT 67 68 68 70 70 70 69 68 68 70 71 71 70 69 69 66 69 72 72 71 70
MAX/MIN RH 46 98 70 99 61
RH 87 55 47 55 74 90 93 97 97 84 74 72 87 93100 93100 87 67 61 76
WIND DIR SW SW SW W W NE NE NE NE NE E E E NE NE S SW SW SW SW S
WIND SPD 1 5 9 8 3 3 3 4 5 5 4 4 3 2 2 2 2 3 4 4 2
CLOUDS SC FW SC B1 B2 SC B1 SC B1 B2 B1 B1 OV OV B2 B2 B2 B1 SC SC SC
CLOUDS(%) 31 22 30 60 70 50 63 48 60 70 57 64100100 83 80 74 64 37 37 32
VSBY 10 10 10 6 5 7 10 10 10 10 7 6 3 3 6 6 7 7 7 7 10
POP 12HR 40 50 60 90 20
RAIN SHWRS SC SC IS IS SC O O SC SC IS IS IS IS
TSTMS SC SC IS SC SC IS IS IS
MIX HGT <1 3 7 5 <1 <1 <1 <1 1 2 3 2 <1 <1 <1 <1 <1 2 4 3 <1
T WIND DIR E SW W SW W N NE NE NE NE E NE E E E NE E S S S E
T WIND SPD 1 20 18 13 2 3 19 13 6 13 6 2 5 5 2 2 2 6 4 3 1
DISPERSION VP VP VP VP VP VP VP VP VP
ADI 1 92139 55 1 2 9 9 10 32 21 6 5 5 1 1 3 21 21 14 1
MAX LVORI 5 1 1 1 3 7 6 6 6 4 3 3 5 7 10 8 9 4 3 2 4
STABILITY A A B C F F F E C C C C D D F F B B A A G
CEILING None None 12700 None 500 1200 400 400 None None
STA PRES 29.28 29.23 29.31 29.37 29.42 29.39 29.36 29.32 29.30 29.23
Date Sun 08/23/26Mon 08/24/26Tue 08/25/26Wed 08/26/26
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 65 86 62 85 61 85 64 87
TEMP 68 68 85 77 66 64 83 75 64 63 83 76 66 66 84 79
DEWPT 67 66 66 63 60 60 62 61 59 59 65 64 64 65 69 68
RH 97 93 53 62 81 87 49 62 84 87 55 66 93 97 61 69
WIND SPD <15 <15 <15 <15 <15 <15 <15 <15
AVG CLOUDS SC FW FW FW FW FW CL FW FW FW FW FW FW SC SC B1
POP 12HR 10 5 5 0 5 10 20 30
RAIN SHWRS IS SC
TSTMS 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