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EXPERIMENTAL...FIRE WEATHER POINT FORECAST MATRICES
NATIONAL WEATHER SERVICE Blacksburg VA
231 PM EDT Wed May 20 2026
VAZ012-210800-
RAWS 447502
37.01N 81.18W Elev. 2540 ft
231 PM EDT Wed May 20 2026
Date 05/20/26 Thu 05/21/26 Fri 05/22/26 Sat
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 62 69 55 61 56
TEMP 84 74 67 65 63 63 69 69 66 64 59 56 55 55 58 61 61 60 58 56 56 57
DEWPT 55 58 60 60 59 61 62 63 63 62 59 56 55 55 58 59 59 58 57 56 55 57
MIN/MAX RH 96 78 100 91 100
RH 37 57 78 84 87 93 78 81 90 93100100100100100 93 93 93 96100 96100
WIND DIR W W NW NW NW SE S NE E E E E E E E SE SE SE SE SE SE SE
WIND SPD 5 3 3 3 2 2 3 4 4 1 3 3 3 3 3 4 3 3 3 3 2 2
CLOUDS SC B1 B1 B2 B2 B2 B2 OV OV OV OV OV B2 OV B2 OV OV OV OV OV OV OV
CLOUDS(%) 38 65 69 79 82 86 85 91 98 96 94 90 85 88 86 90 89 88 88 90 90 95
VSBY 10 10 9 7 5 5 6 9 5 4 2 3 5 6 4 3 4 5
POP 12HR 60 100 80 70 70
RAIN SHWRS IS SC SC IS SC SC NM O O O NM NM NM O O NM NM NM NM O O O
TSTMS IS SC SC SC SC SC IS IS
MIX HGT 7 <1 <1 <1 <1 <1 2 2 1 <1 1 <1 <1 1 1 2 2 1
T WIND DIR S SW W NW N E SW SW W NE E E E E E E E E
T WIND SPD 5 4 4 2 2 3 6 10 8 8 10 3 4 4 6 8 9 9
DISPERSION VP VP VP VP VP VP VP VP VP VP VP VP
ADI 48 2 2 1 1 4 16 24 13 4 5 2 2 7 12 16 19 4
MAX LVORI 1 3 4 5 6 6 4 3 5 6 9 10 9 8 7 4 5 6
STABILITY A F F F F B B C C F F F F B B C B F
CEILING None 5300 1100 100 700 100 100 200 200 200
STA PRES 27.31 27.32 27.30 27.31 27.29 27.32 27.33 27.37 27.36
Date 05/23Sun 05/24/26Mon 05/25/26Tue 05/26/26Wed 05/27/26
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 69 56 77 58 76 58 76 58 75
TEMP 65 69 61 59 74 71 63 61 74 71 63 61 75 71 63 61 74 71
DEWPT 62 63 60 59 63 63 60 61 64 64 60 61 64 64 60 60 62 63
RH 90 81 97100 69 76 90100 71 79 90100 69 79 90 97 66 76
WIND SPD <15 <15 <15 <15 <15 <15 <15 <15 <15
AVG CLOUDS OV OV B2 B2 B2 B2 B2 B2 B2 B2 B1 B1 B2 B2 B1 B1 B2 B2
POP 12HR 80 40 70 20 80 40 80 40 80
RAIN SHWRS O O SC IS SC NM IS IS NM O SC IS NM O SC SC NM O
TSTMS IS SC IS IS SC IS IS SC IS 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