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EXPERIMENTAL...FIRE WEATHER POINT FORECAST MATRICES
NATIONAL WEATHER SERVICE Blacksburg VA
131 PM EDT Wed May 20 2026
VAZ018-202000-
RAWS 444002
37.56N 80.18W Elev. 2702 ft
131 PM 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 92 63 67 54 59
TEMP 89 88 77 69 66 63 64 67 67 63 58 55 55 54 56 58 59 59 57
DEWPT 58 60 62 62 61 61 62 66 67 65 59 57 55 54 55 58 58 59 56
MAX/MIN RH 35 99 90 100 93
RH 35 39 60 78 84 93 93 97100107104108100100 96100 96100 96
WIND DIR W W W NW N N E SE E E E E E E E E E E E
WIND SPD 5 4 4 4 4 3 3 3 5 6 4 3 3 3 4 4 5 5 4
WIND GUST 18 16 13 14 16 17 16 16 19
CLOUDS SC B1 B1 B1 B1 B2 OV OV OV OV OV OV OV OV OV OV B2 B2 B2
CLOUDS(%) 26 56 64 67 69 74 90 93 92 94 96 94 93 92 92 92 87 86 87
VSBY 10 10 10 10 7 4 4 4 4 3 3 2 2 5 3 2 2 2 2
POP 12HR 40 70 90 90 80
RAIN SHWRS SC SC SC SC SC SC NM O NM O NM O O O O O O O
TSTMS SC SC IS IS SC SC IS IS
Obvis PF
MIX HGT 7 6 <1 <1 <1 <1 <1 1 2 1 1 1 1 1 1 1 2 1 1
T WIND DIR SW SW SW NW N NE E SE NE NE NE NE NE NE E E E E E
T WIND SPD 9 8 3 2 1 1 8 10 14 11 10 8 6 8 8 9 10 9 10
DISPERSION VP VP VP VP VP VP VP VP VP
ADI 81 35 2 2 1 1 10 19 32 15 7 4 3 4 11 16 22 17 7
MAX LVORI 1 1 3 4 6 7 5 5 4 5 8 9 9 9 6 5 5 5 6
STABILITY A C E E E F B B C C E F F F C C C C E
CEILING None 4900 1300 500 300 100 100 100 100
STA PRES 27.81 27.83 27.83 27.83 27.85 27.90 27.90 27.95 27.94
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 64 61 80 64 81 65 82
TEMP 55 55 63 62 63 64 77 73 66 67 80 72 67 68 79 74
DEWPT 53 54 62 62 59 61 67 65 61 63 68 66 61 62 67 66
RH 93 96 97100 87 90 71 76 84 87 67 81 81 81 67 76
WIND SPD <15 <15 <15 <15 <15 <15 <15 <15
AVG CLOUDS OV OV OV B2 B2 B2 B2 B2 B2 B2 B2 OV B2 B2 B2 B2
POP 12HR 70 80 60 70 40 90 60 80
RAIN SHWRS O NM O NM NM SC SC NM SC SC NM O NM SC NM O
TSTMS SC IS SC IS SC 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