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EXPERIMENTAL...FIRE WEATHER POINT FORECAST MATRICES
NATIONAL WEATHER SERVICE Blacksburg VA
631 AM EDT Wed May 20 2026
VAZ012-202000-
RAWS 447502
37.01N 81.18W Elev. 2540 ft
631 AM EDT Wed May 20 2026
Date Wed 05/20/26 Thu 05/21/26 Fri 05/22/26
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 89 59 79 53 65
TEMP 67 77 83 84 74 65 63 61 62 73 73 69 66 61 58 56 55 59 62 64 62
DEWPT 57 58 56 55 60 61 60 59 61 62 62 63 62 59 56 55 55 58 59 60 59
MAX/MIN RH 33 98 60 100 87
RH 70 52 40 37 62 87 90 93 97 68 68 81 87 93 93 96100 96 90 87 90
WIND DIR W W W SW W NW N N N SE E NE E E E E E SE SE SE SE
WIND SPD 4 3 3 2 2 1 0 0 0 1 1 1 2 3 3 3 3 3 4 3 3
CLOUDS FW FW SC SC B1 OV B2 OV B2 B2 B2 OV OV OV B2 B2 B2 B2 OV B2 B2
CLOUDS(%) 10 21 29 35 68 88 79 90 81 77 85 88 94 94 85 85 84 81 88 87 85
VSBY 10 10 10 10 10 8 7 6 6 8 9 5 2 1 2 6 4 10 10 10 10
POP 12HR 30 50 100 90 70
RAIN SHWRS IS SC SC IS IS IS SC NM O O O NM NM NM NM NM NM O
TSTMS IS SC IS SC SC SC IS IS IS IS
MIX HGT <1 5 7 6 <1 <1 <1 <1 1 3 2 1 <1 1 <1 <1 <1 1 2 2 1
T WIND DIR W W SW SW SW SW W NW N NE E E E E E E E E E SE SE
T WIND SPD 6 12 10 5 4 5 1 2 3 2 5 11 12 11 10 9 11 9 8 8 8
DISPERSION VP VP VP VP VP VP VP VP VP
ADI 7 73 86 43 2 3 1 1 5 8 15 18 6 5 5 4 12 15 16 17 4
MAX LVORI 3 1 1 1 3 5 7 7 9 3 3 3 5 6 6 7 5 5 4 4 6
STABILITY A A A A F F F F B B B B F F F F B B C B F
CEILING None None 4000 100 200 1400 500 200 200 200
STA PRES 27.36 27.29 27.30 27.30 27.34 27.34 27.38 27.38 27.40 27.39
Date Sat 05/23/26Sun 05/24/26Mon 05/25/26Tue 05/26/26
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 54 76 57 77 58 77 59 77
TEMP 58 57 70 69 61 59 75 71 62 61 75 71 62 61 75 71
DEWPT 57 57 62 63 59 59 63 64 60 61 64 65 61 61 64 64
RH 96100 76 81 93100 66 79 93100 69 81 97100 69 79
WIND SPD <15 <15 <15 <15 <15 <15 <15 <15
AVG CLOUDS B2 B2 B2 OV B2 B1 B2 OV B2 B1 B2 OV B1 B1 B2 OV
POP 12HR 80 90 40 80 30 90 30 90
RAIN SHWRS O NM O O SC SC O SC NM O SC IS NM O
TSTMS IS IS IS SC IS SC IS IS SC IS IS 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