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EXPERIMENTAL...FIRE WEATHER POINT FORECAST MATRICES
NATIONAL WEATHER SERVICE Blacksburg VA
400 AM EDT Wed May 20 2026
VAZ018-202000-
RAWS 444002
37.56N 80.18W Elev. 2702 ft
400 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 92 65 76 54 62
TEMP 65 71 85 91 88 77 71 68 66 67 73 73 69 64 61 59 57 56 59 60 61 58
DEWPT 56 60 63 59 61 63 63 62 61 63 66 66 64 59 57 54 54 54 58 58 59 56
MAX/MIN RH 35 87 74 94 86
RH 73 68 48 34 40 62 76 81 84 87 79 79 84 84 87 83 90 93 96 93 93 93
WIND DIR W W W W W NW NW N N E E E E E E E E E E E E E
WIND SPD 6 4 4 4 3 3 2 0 0 1 2 3 3 4 4 3 3 4 4 4 4 4
WIND GUST 14 13 17 17 14 13 16 16 14 14 18
CLOUDS CL CL CL SC B1 B2 B2 B2 B2 B2 OV OV OV OV OV OV OV B2 B2 B2 OV OV
CLOUDS(%) 3 5 2 29 53 76 72 79 73 86 90 90 93 97 97 94 94 86 86 87 88 90
VSBY 10 10 10 10 10 10 9 4 3 4 6 7 3 1 1 1 3 3 10 10 10 10
POP 12HR 30 70 100 100 80
RAIN SHWRS SC NM SC SC SC SC O NM O O O O O O O SC SC O
TSTMS SC SC IS IS IS SC SC IS IS
MIX HGT <1 <1 5 7 6 <1 <1 <1 <1 <1 1 2 1 <1 1 1 1 1 1 1 1 1
T WIND DIR W W W SW SW NW N NE E E NE NE NE E E E E E E E E E
T WIND SPD 5 4 13 11 8 2 2 5 10 8 13 16 11 8 10 10 9 11 10 10 9 8
DISPERSION PR VP VP VP VP VP VP VP VP VP
ADI 3 4 83100 51 1 1 3 5 10 25 33 18 5 7 5 4 17 17 19 16 5
MAX LVORI 3 3 1 1 1 3 4 5 5 4 3 3 4 5 4 5 5 5 5 5 5 6
STABILITY F A A A B F F F F B B B B E E F F C C C C E
CEILING None None 3500 0 100 400 100 100 200 200
STA PRES 27.88 27.80 27.83 27.84 27.90 27.94 27.97 27.96 27.99 27.98
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 56 71 61 78 64 80 65 81
TEMP 58 58 68 67 64 63 76 72 66 66 78 73 67 67 80 74
DEWPT 54 55 63 62 58 60 66 65 60 62 68 66 61 63 67 65
RH 86 90 84 84 81 90 71 79 81 87 71 79 81 87 65 74
WIND SPD <15 <15 <15 <15 <15 <15 <15 <15
AVG CLOUDS OV B2 OV B2 B2 B2 B1 B2 B1 B2 B2 OV B1 B1 B2 B2
POP 12HR 80 90 50 70 40 80 30 80
RAIN SHWRS O NM O NM SC IS SC NM SC IS SC O SC IS 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