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EXPERIMENTAL...FIRE WEATHER POINT FORECAST MATRICES
NATIONAL WEATHER SERVICE Blacksburg VA
801 PM EDT Thu May 21 2026
VAZ018-220800-
RAWS 444002
37.56N 80.18W Elev. 2702 ft
801 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 55 56 51 63 60
TEMP 60 60 58 55 56 56 56 54 53 52 52 51 54 61 63 62 61 61 60 63
DEWPT 58 56 55 54 56 56 56 54 53 52 52 51 54 58 60 59 58 58 57 59
MIN/MAX RH 100 87 100 90 90
RH 93 87 90 96100100100100100100100100100 90 90 90 90 90 90 87
WIND DIR E E E E E E E E E E E E SE SE SE E SE N N N
WIND SPD 3 3 3 3 4 4 4 4 4 3 3 3 3 3 2 2 1 0 0 0
WIND GUST 14 13 13 14 16 14 14 19 19 17 16 16 14
CLOUDS OV OV OV OV OV OV OV OV OV OV OV OV OV OV OV OV OV B2 B2 B1
CLOUDS(%) 92 94 90 98 93 95 94 94 94 98 98 98 98 88 88 88 90 85 82 66
VSBY 2 2 3 2 2 2 2 2 1 2 3 2 2 2 2 2 1 1 1 2
POP 12HR 80 80 100 100 70
RAIN SHWRS NM NM NM NM SC O SC SC NM O O O O NM NM NM NM IS IS IS
TSTMS IS IS IS SC
MIX HGT 1 1 1 <1 1 1 1 <1 1 1 1 1 1 1 1 <1
T WIND DIR E NE E E E E E E E E E E E E E E
T WIND SPD 9 6 6 9 10 6 12 12 10 8 10 9 9 5 6 5
DISPERSION VP VP VP VP VP VP VP VP VP VP VP
ADI 4 3 3 11 14 10 18 8 7 4 5 13 14 9 11 3
MAX LVORI 7 5 6 7 5 7 5 8 8 9 9 5 5 6 5 6
STABILITY F F F B C C C E E F F B B B B F
CEILING 100 100 100 100 200 100 200 100 100
STA PRES 27.90 27.91 27.95 27.95 27.97 27.96 27.96 27.92
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 80 63 74 64 75 63 78 63 78
TEMP 79 73 66 66 73 69 66 67 74 71 66 67 77 73 67 66 77 72
DEWPT 68 66 62 63 69 66 62 63 69 66 62 62 67 65 61 60 64 62
RH 69 79 87 90 87 90 87 87 84 84 87 84 71 76 81 81 64 71
WIND SPD <15 <15 <15 <15 <15 <15 <15 <15 <15
AVG CLOUDS B1 B2 B1 B2 B2 OV B2 B2 OV OV B2 B2 B2 OV B2 B1 B1 B2
POP 12HR 80 50 90 60 90 50 80 40 60
RAIN SHWRS IS O SC SC NM O NM SC O O SC SC NM O SC SC SC NM
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