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EXPERIMENTAL...FIRE WEATHER POINT FORECAST MATRICES
NATIONAL WEATHER SERVICE Blacksburg VA
131 AM EDT Tue Apr 21 2026
NCZ005-220800-
RAWS 310540
36.38N 79.70W Elev. 858 ft
131 AM EDT Tue Apr 21 2026
Date 04/20/26 Tue 04/21/26 Wed 04/22/26 Thu
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 31 70 48 83 52
TEMP 40 36 37 53 64 69 62 55 54 51 53 71 80 82 73 62 57 54 57
DEWPT 20 21 22 24 25 28 31 32 33 35 38 44 42 40 42 43 44 44 46
MIN/MAX RH 65 21 60 22 69
RH 44 54 54 32 22 21 31 41 45 54 57 38 26 22 33 50 62 69 67
WIND DIR NE NE NE SE SW SW S S SW SW SW SW W W NW W W W W
WIND SPD 3 2 3 2 4 6 5 5 5 6 6 9 11 10 5 3 3 3 3
CLOUDS FW CL CL FW FW FW SC B1 SC SC FW FW FW FW SC FW FW FW FW
CLOUDS(%) 6 4 5 7 8 16 46 54 46 31 23 21 17 16 27 24 12 10 11
VSBY 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10
POP 12HR 0 0 0 10 5
MIX HGT <1 <1 <1 4 5 5 <1 <1 <1 <1 <1 3 9 11 <1
T WIND DIR N NE NE SW SW SW SW S SW SW SW W NW NW NW
T WIND SPD 3 3 3 2 6 12 6 6 6 6 8 28 26 23 12
DISPERSION VP VP PR PR PR PR PR VP VP VP
ADI 2 2 3 10 40 70 5 5 5 3 8112140200 6
MAX LVORI 2 2 2 2 1 1 2 2 2 2 2 1 1 1 2
STABILITY G G A A A B E E E F B B C B F
CEILING None None None None None None None None
STA PRES 29.61 29.64 29.49 29.43 29.38 29.33 29.29
Date 04/23Fri 04/24/26Sat 04/25/26Sun 04/26/26Mon 04/27/26
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 85 57 85 60 83 58 79 56 73
TEMP 83 76 63 61 83 78 65 63 81 75 63 59 76 72 61 57 70 70
DEWPT 46 47 48 49 46 45 47 52 53 55 57 55 54 53 54 54 55 55
RH 27 36 58 65 27 31 52 67 38 50 81 87 46 51 78 90 59 59
WIND SPD <15 <15 <15 <15 <15 <15 <15 <15 <15
AVG CLOUDS FW SC FW FW FW SC SC SC SC B1 B1 B1 B1 B1 B1 B1 B2 B2
POP 12HR 5 5 5 10 40 50 40 40 40
RAIN SHWRS IS SC SC SC SC SC SC 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