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EXPERIMENTAL...FIRE WEATHER POINT FORECAST MATRICES
NATIONAL WEATHER SERVICE Blacksburg VA
801 PM EDT Mon Aug 17 2026
VAZ024-180800-
RAWS 441631
37.63N 79.51W Elev. 865 ft
801 PM EDT Mon Aug 17 2026
Date 08/17/26 Tue 08/18/26 Wed 08/19/26 Thu
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 68 92 63 92 67
TEMP 73 71 70 71 83 89 88 78 72 68 65 67 82 89 91 83 74 70 68 70
DEWPT 71 70 68 70 71 69 69 68 67 66 62 64 66 64 63 65 65 65 64 66
MIN/MAX RH 97 49 95 40 89
RH 93 97 93 97 67 52 54 71 84 93 90 90 58 44 40 55 74 84 87 87
WIND DIR SW W W NW N NW NW NW NW N N N W W W W N N N N
WIND SPD 1 1 1 1 2 3 3 2 1 0 0 0 1 2 2 1 0 0 0 0
CLOUDS B2 B1 SC SC SC SC SC FW FW SC SC FW FW FW FW FW FW FW SC SC
CLOUDS(%) 70 66 38 28 32 39 41 23 22 26 36 22 12 8 15 13 20 18 32 29
VSBY 9 5 3 5 10 10 10 10 7 6 3 10 10 10 10 10 10 10 10 10
POP 12HR 30 10 10 0 10
RAIN SHWRS
TSTMS
Obvis F F F F
MIX HGT <1 <1 <1 <1 3 4 4 <1 <1 <1 <1 <1 3 5 6 <1
T WIND DIR NW NW N N NE S SW W W NW NW NW NW NW NW W
T WIND SPD 3 2 3 3 5 5 4 2 2 3 4 4 6 8 9 3
DISPERSION VP VP VP VP VP VP VP VP VP VP VP
ADI 2 1 2 3 22 33 21 1 1 2 2 4 27 49 72 2
MAX LVORI 7 8 8 9 3 1 2 3 5 7 6 6 2 1 1 3
STABILITY F F F A A A A G G G G A A A A G
CEILING 5500 None None None None None None None None
STA PRES 28.44 28.44 28.46 28.42 28.44 28.45 28.47 28.45
Date 08/20Fri 08/21/26Sat 08/22/26Sun 08/23/26Mon 08/24/26
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 90 65 84 64 84 63 85 60 84
TEMP 90 80 70 67 82 74 67 66 82 75 67 66 84 75 63 63 82 74
DEWPT 69 70 69 67 71 69 67 66 69 68 66 65 65 62 61 60 61 59
RH 50 72 97100 69 84100100 65 79 97 97 53 64 93 90 49 59
WIND SPD <15 <15 <15 <15 <15 <15 <15 <15 <15
AVG CLOUDS SC B2 B2 B1 B1 B2 B2 B2 B1 B1 B1 SC SC SC FW FW FW SC
POP 12HR 60 60 60 60 40 30 20 5 5
RAIN SHWRS NM NM SC SC NM NM IS IS SC SC IS
TSTMS SC SC IS 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