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EXPERIMENTAL...FIRE WEATHER POINT FORECAST MATRICES
NATIONAL WEATHER SERVICE Blacksburg VA
731 AM EDT Thu May 21 2026
VAZ024-212000-
RAWS 441631
37.63N 79.51W Elev. 865 ft
731 AM EDT Thu May 21 2026
Date Thu 05/21/26 Fri 05/22/26 Sat 05/23/26
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 78 54 62 51 64
TEMP 67 76 77 71 66 62 60 58 56 60 62 62 60 57 55 54 53 58 62 64 63
DEWPT 64 67 66 65 61 59 58 57 56 59 59 59 57 56 55 53 53 58 60 62 61
MAX/MIN RH 67 100 89 100 87
RH 90 74 69 81 84 90 93 96100 96 90 90 90 96100 96100100 93 93 93
WIND DIR NE E N N NE NE NE NE NE E E E E E E E E E E E E
WIND SPD 1 2 4 4 3 2 2 2 2 3 3 3 3 3 2 2 1 2 2 2 1
WIND GUST 14 12 13
CLOUDS B2 B2 OV OV OV OV OV OV OV OV OV OV OV OV OV OV OV OV OV B2 B2
CLOUDS(%) 71 79 93 94 97 97 96 94 94 88 89 90 94 91 90 90 98 98 88 87 85
VSBY 9 9 7 4 3 3 3 3 4 4 3 3 2 10 10 10 10 10 10 10 10
POP 12HR 100 100 90 80 100
RAIN SHWRS SC NM O O NM O O O SC O O O O O O O O SC SC NM
TSTMS SC SC
Obvis F F F F F PF
MIX HGT 1 2 2 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1 1 1 1
T WIND DIR E E E NE NE NE NE NE NE NE NE E NE NE NE NE NE NE E E E
T WIND SPD 8 9 11 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
ADI 14 25 23 26 6 6 6 4 14 26 27 26 5 5 3 3 11 7 8 10 2
MAX LVORI 5 3 3 3 5 6 6 9 5 4 4 4 6 9 9 8 7 8 6 6 6
STABILITY B B C C F F F F B B B B F F F F B B B B F
CEILING 400 700 700 400 500 400 400 400 400 700
STA PRES 28.58 28.58 28.62 28.62 28.69 28.69 28.71 28.71 28.73 28.69
Date Sun 05/24/26Mon 05/25/26Tue 05/26/26Wed 05/27/26
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 81 63 83 64 82 63 83
TEMP 61 61 79 75 68 65 81 77 69 66 81 77 69 65 82 77
DEWPT 60 60 68 67 63 65 69 69 66 65 69 69 66 64 67 67
RH 97 97 69 76 84100 67 76 90 97 67 76 90 97 61 71
WIND SPD <15 <15 <15 <15 <15 <15 <15 <15
AVG CLOUDS B2 B2 B2 B2 B1 B2 B2 B2 B1 B2 B2 OV B2 B1 B2 B2
POP 12HR 60 50 50 80 40 90 50 60
RAIN SHWRS NM IS SC SC IS SC O SC SC O O SC IS SC NM
TSTMS SC IS IS SC IS 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