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EXPERIMENTAL...FIRE WEATHER POINT FORECAST MATRICES
NATIONAL WEATHER SERVICE Blacksburg VA
431 PM EDT Tue Aug 18 2026
VAZ018-190800-
RAWS 444002
37.56N 80.18W Elev. 2702 ft
431 PM EDT Tue Aug 18 2026
Date 08/18/26 Wed 08/19/26 Thu 08/20/26 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 63 87 67 86 65
TEMP 78 72 67 65 64 65 77 85 85 75 71 70 68 69 80 84 81 73 70 68 66 67
DEWPT 69 64 63 62 61 62 65 64 63 63 62 62 62 63 67 68 68 67 66 65 65 65
MIN/MAX RH 92 47 82 58 96
RH 74 76 87 90 90 90 67 50 48 66 73 76 81 81 65 59 65 81 87 90 97 93
WIND DIR NW NW NW NW NW NW NW NW NW NW NW W W W W W W NW NW NW NW N
WIND SPD 5 4 2 1 2 2 2 3 4 2 1 1 1 1 2 4 4 2 1 1 1 1
WIND GUST 16 14
CLOUDS FW FW FW FW FW FW FW CL CL FW FW SC SC SC B1 B1 B1 B1 B1 B2 B2 B1
CLOUDS(%) 25 19 11 6 16 14 9 4 5 8 8 29 49 34 52 65 65 67 67 72 72 61
VSBY 10 10 10 1 1 3 10 10 10 10 9 8 8 7 7 6 6 6 6 7 7
POP 12HR 0 0 10 50 60
RAIN SHWRS IS IS SC SC SC SC NM NM SC
TSTMS SC SC IS IS
Obvis PF PF PF
MIX HGT 5 <1 <1 <1 <1 <1 3 5 5 <1 <1 <1 <1 <1 4 4 5 <1
T WIND DIR NW NW NW NW NW NW NW NW NW W W W SW NW SE SW W W
T WIND SPD 5 5 3 2 3 2 8 10 11 4 2 2 2 3 1 21 21 9
DISPERSION VP VP VP VP VP VP VP VP VP VP VP VP
ADI 33 3 2 1 2 2 33 59 77 2 1 1 1 3 5105 87 4
MAX LVORI 1 4 6 6 7 6 3 1 1 3 3 4 5 5 3 1 1 4
STABILITY A F G G G A A A A G G G F A B B C F
CEILING None None None None None None None 6300 3900
STA PRES 27.77 27.76 27.79 27.77 27.77 27.76 27.77 27.70
Date 08/21Sat 08/22/26Sun 08/23/26Mon 08/24/26Tue 08/25/26
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 81 64 81 63 80 59 81 61 83
TEMP 80 73 68 65 79 72 66 65 78 70 61 62 79 71 63 63 81 72
DEWPT 71 67 64 64 68 65 62 62 64 59 57 58 61 59 57 58 64 62
RH 74 81 87 97 69 79 87 90 62 68 87 87 54 66 81 84 56 71
WIND SPD <15 <15 <15 <15 <15 <15 <15 <15 <15
AVG CLOUDS B2 OV B2 B2 B1 B1 SC SC FW FW FW FW FW FW FW SC SC SC
POP 12HR 80 60 40 20 10 5 5 5 20
RAIN SHWRS SC O NM SC IS SC IS IS
TSTMS IS SC IS 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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