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EXPERIMENTAL...FIRE WEATHER POINT FORECAST MATRICES
NATIONAL WEATHER SERVICE Blacksburg VA
431 PM EDT Tue Apr 21 2026
VAZ012-220800-
RAWS 447502
37.01N 81.18W Elev. 2540 ft
431 PM EDT Tue Apr 21 2026
Date 04/21/26 Wed 04/22/26 Thu 04/23/26 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 45 76 46 78 49
TEMP 68 59 50 48 48 51 69 75 74 64 55 51 48 50 72 77 76 66 57 52 50 53
DEWPT 35 37 37 37 37 38 38 38 37 37 38 39 40 43 45 44 42 43 43 43 43 45
MIN/MAX RH 67 26 81 29 82
RH 29 44 61 65 65 61 32 26 26 37 53 63 74 77 38 31 30 43 59 71 77 74
WIND DIR W SW SW W W W W W W W W W W W W W W W W W W W
WIND SPD 5 5 4 5 6 8 11 10 9 5 3 3 3 3 4 4 4 3 2 2 3 3
WIND GUST 21 20
CLOUDS SC SC FW FW FW SC B1 B1 B1 SC FW FW FW FW FW FW SC FW FW FW FW FW
CLOUDS(%) 30 34 22 19 18 38 55 58 52 38 21 7 9 7 7 23 30 15 11 13 25 20
VSBY 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10
POP 12HR 0 10 0 10 5
MIX HGT 6 <1 <1 <1 <1 <1 5 7 7 <1 <1 <1 <1 <1 5 7 7 <1
T WIND DIR W SW SW W W W W W W W W W W W NW NW W W
T WIND SPD 13 8 6 9 10 11 35 27 25 8 5 5 5 5 17 11 10 3
DISPERSION PR VP PR PR PR VP VP VP VP VP VP VP
ADI 105 4 3 4 5 12145132122 4 3 3 3 6117 96 82 2
MAX LVORI 1 2 3 3 3 2 1 1 1 2 2 3 3 3 1 1 1 2
STABILITY A F F F F B C C C F G G G A A A A G
CEILING None None None None None None None None None
STA PRES 27.37 27.34 27.34 27.28 27.30 27.29 27.31 27.23
Date 04/24Sat 04/25/26Sun 04/26/26Mon 04/27/26Tue 04/28/26
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 80 52 73 48 73 45 72 50 72
TEMP 77 68 56 55 72 64 52 50 71 63 49 47 71 64 54 51 68 63
DEWPT 41 46 47 49 54 52 49 47 44 44 44 44 45 45 46 48 51 49
RH 28 45 72 80 53 65 89 89 38 50 83 89 39 50 74 89 54 60
WIND SPD <15 <15 <15 <15 <15 <15 <15 <15 <15
AVG CLOUDS FW SC SC B1 B2 OV B2 B1 B1 B1 B1 SC B1 B1 B1 B2 B2 B1
POP 12HR 10 30 90 60 30 30 40 60 70
RAIN SHWRS IS SC NM O NM SC SC SC SC IS IS SC SC NM NM SC
TSTMS 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