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EXPERIMENTAL...FIRE WEATHER POINT FORECAST MATRICES
NATIONAL WEATHER SERVICE Blacksburg VA
131 AM EDT Mon Apr 20 2026
NCZ006-210800-
RAWS 310801
36.37N 79.29W Elev. 580 ft
131 AM EDT Mon Apr 20 2026
Date 04/19/26 Mon 04/20/26 Tue 04/21/26 Wed
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 40 67 33 70 49
TEMP 44 42 45 59 63 64 54 45 38 33 37 56 65 69 64 56 53 50 53
DEWPT 25 26 30 34 28 22 21 21 21 23 24 26 26 28 31 32 33 33 37
MIN/MAX RH 57 20 68 21 55
RH 47 53 55 39 26 20 27 38 50 66 59 31 23 21 29 40 46 52 54
WIND DIR SW SW W W NW NW N N NE N NE SE SW SW S S SW SW SW
WIND SPD 1 2 3 8 10 10 4 2 2 1 1 1 2 4 3 4 4 5 5
WIND GUST 18 21 20
CLOUDS CL CL CL FW SC FW FW FW FW CL FW CL FW FW SC SC SC SC SC
CLOUDS(%) 5 4 5 23 31 14 12 6 7 5 7 5 11 12 28 34 41 28 34
VSBY 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10
POP 12HR 0 0 0 0 5
MIX HGT <1 <1 <1 6 8 9 <1 <1 <1 <1 1 4 5 5 <1
T WIND DIR SW SW SW W W NW N N N N E NW W SW S
T WIND SPD 3 4 6 19 24 20 12 8 3 3 6 2 4 5 6
DISPERSION VP VP VP VP VP VP VP VP VP PR
ADI 2 2 7127200107 6 4 2 2 10 11 28 37 3
MAX LVORI 2 2 2 1 1 1 2 2 2 3 2 2 2 1 2
STABILITY G G A B B C F G G G A A A A G
CEILING None None None None None None None None
STA PRES 29.55 29.59 29.56 29.66 29.71 29.73 29.60
Date 04/22Thu 04/23/26Fri 04/24/26Sat 04/25/26Sun 04/26/26
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 83 52 85 57 88 60 86 57 77
TEMP 81 75 59 58 83 77 64 60 86 79 66 63 82 77 64 59 75 71
DEWPT 44 45 47 48 50 49 49 50 47 48 49 52 54 56 57 55 54 52
RH 27 34 64 69 32 37 58 69 26 34 54 67 38 48 78 87 48 51
WIND SPD <15 <15 <15 <15 <15 <15 <15 <15 <15
AVG CLOUDS SC SC SC FW FW FW SC FW FW SC SC SC B1 B1 B1 B1 B2 B1
POP 12HR 10 5 5 0 5 10 40 40 40
RAIN SHWRS IS SC SC IS IS SC
TSTMS 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