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EXPERIMENTAL...FIRE WEATHER POINT FORECAST MATRICES
NATIONAL WEATHER SERVICE Blacksburg VA
801 PM EDT Wed Apr 22 2026
VAZ024-230800-
RAWS 441631
37.63N 79.51W Elev. 865 ft
801 PM EDT Wed Apr 22 2026
Date 04/22/26 Thu 04/23/26 Fri 04/24/26 Sat
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 50 85 54 86 56
TEMP 61 56 52 54 75 83 84 74 65 59 55 57 77 84 85 77 67 61 57 59
DEWPT 47 46 45 47 51 50 50 49 49 50 49 51 52 49 48 49 50 50 50 51
MIN/MAX RH 81 31 86 27 80
RH 60 69 77 77 43 32 31 41 56 72 80 80 42 30 28 37 54 67 77 75
WIND DIR SW W W W NW NW W W W NW NW NW W W W W W NW W W
WIND SPD 2 2 2 2 3 4 4 2 1 1 1 1 2 4 3 2 1 1 1 1
CLOUDS FW FW FW FW FW SC FW FW FW FW FW FW FW SC SC SC SC SC SC B1
CLOUDS(%) 10 7 13 20 8 36 22 12 7 9 13 19 15 33 33 33 33 43 43 61
VSBY 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10
POP 12HR 5 10 0 20 20
RAIN SHWRS IS IS IS IS IS IS SC
TSTMS IS
MIX HGT <1 <1 <1 <1 5 8 8 <1 <1 <1 <1 <1 7 9 7 <1
T WIND DIR W NW NW NW NW W W W NW NW NW NW W W W W
T WIND SPD 4 3 2 2 17 12 12 3 3 3 3 2 13 10 11 3
DISPERSION VP VP VP VP VP VP VP VP VP VP VP
ADI 2 2 1 2112122118 2 2 2 2 2115106100 2
MAX LVORI 3 3 4 4 1 1 1 2 3 3 5 4 1 1 1 2
STABILITY G G G A A A A G G G G A A A A G
CEILING None None None None None None None None None
STA PRES 28.52 28.52 28.53 28.45 28.46 28.44 28.42 28.35
Date 04/25Sun 04/26/26Mon 04/27/26Tue 04/28/26Wed 04/29/26
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 52 76 48 74 53 76 52 80
TEMP 78 72 57 54 72 66 53 50 70 68 58 55 69 69 57 54 77 71
DEWPT 56 53 50 49 49 46 44 44 47 46 49 52 57 53 51 51 49 46
RH 47 51 77 83 44 48 71 80 44 45 72 90 66 57 80 90 37 41
WIND SPD <15 <15 <15 <15 <15 <15 <15 <15 <15
AVG CLOUDS B1 B2 B2 B1 B1 SC SC B1 SC SC B1 B2 B2 B2 B1 SC SC B1
POP 12HR 70 60 30 10 20 60 70 30 30
RAIN SHWRS SC NM NM SC SC IS IS SC NM NM SC SC IS IS SC
TSTMS SC IS IS IS
$$
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