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EXPERIMENTAL...FIRE WEATHER POINT FORECAST MATRICES
NATIONAL WEATHER SERVICE Blacksburg VA
231 PM EDT Thu May 21 2026
VAZ024-220800-
RAWS 441631
37.63N 79.51W Elev. 865 ft
231 PM EDT Thu May 21 2026
Date 05/21/26 Fri 05/22/26 Sat 05/23/26 Sun
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 54 59 53 64 59
TEMP 75 63 63 61 58 57 57 59 58 57 55 54 53 54 55 62 64 63 62 61 61 60
DEWPT 66 61 59 57 57 55 57 58 58 56 55 54 53 53 55 59 61 60 59 58 58 60
MIN/MAX RH 100 95 100 89 100
RH 74 93 87 87 96 93100 96100 96100100100 96100 90 90 90 90 90 90100
WIND DIR N NE E E NE E E E E E E E E E E E E E N N N N
WIND SPD 4 4 3 2 2 2 3 4 3 3 3 2 2 2 2 2 2 1 0 0 0 0
WIND GUST 16 14 13
CLOUDS OV OV OV OV OV OV OV OV OV OV OV OV OV OV OV B2 OV OV OV B2 B2 B2
CLOUDS(%) 93100 95 95 95 98 93 92 91 95 96 98 98 98 98 86 88 90 90 81 84 79
VSBY 4 3 4 4 4 3 2 2 4 3 10 10 10 10 10 10 10 10
POP 12HR 100 100 100 100 90
RAIN SHWRS O O NM O O O NM O SC NM NM O O O O O O O O SC SC
TSTMS SC IS IS IS IS SC IS
MIX HGT 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1 1 1 1
T WIND DIR NE NE NE NE NE NE NE NE E NE NE NE NE NE NE E E E
T WIND SPD 17 12 12 12 9 9 13 13 13 11 11 6 5 6 4 4 5 4
DISPERSION VP VP VP VP VP VP VP VP VP VP VP VP
ADI 26 6 6 6 4 14 26 27 26 5 5 3 3 11 7 8 10 2
MAX LVORI 3 5 6 6 9 5 4 4 4 6 9 9 8 7 8 6 6 6
STABILITY C F F F F B B B B F F F F B B B B F
CEILING 700 700 400 500 400 400 400 400 700 400
STA PRES 28.58 28.62 28.62 28.69 28.69 28.71 28.71 28.73 28.69
Date 05/24Mon 05/25/26Tue 05/26/26Wed 05/27/26Thu 05/28/26
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 81 62 76 63 77 62 82 61 80
TEMP 79 75 67 63 75 72 67 66 76 73 67 65 80 75 68 64 78 75
DEWPT 68 69 65 63 70 69 65 64 70 69 65 63 68 68 64 62 65 66
RH 69 82 93100 84 90 93 93 82 87 93 93 67 79 87 93 64 74
WIND SPD <15 <15 <15 <15 <15 <15 <15 <15 <15
AVG CLOUDS B1 B2 B2 B2 B2 OV B2 B1 B2 OV B2 B2 B2 B2 B1 B1 B1 B1
POP 12HR 60 60 80 60 90 50 70 40 50
RAIN SHWRS NM NM SC SC O NM SC NM O SC SC SC NM SC SC SC SC
TSTMS SC IS SC IS SC SC 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