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EXPERIMENTAL...FIRE WEATHER POINT FORECAST MATRICES
NATIONAL WEATHER SERVICE Blacksburg VA
801 AM EDT Tue Apr 21 2026
NCZ003-212000-
RAWS 310302
36.35N 80.48W Elev. 1076 ft
801 AM EDT Tue Apr 21 2026
Date Tue 04/21/26 Wed 04/22/26 Thu 04/23/26
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 67 46 80 52 81
TEMP 53 62 67 62 55 51 48 50 70 77 80 73 63 56 52 55 72 79 80 74
DEWPT 23 27 31 35 37 37 37 40 44 40 40 43 44 45 44 46 50 48 47 48
MAX/MIN RH 25 71 24 75 31
RH 31 26 26 36 51 59 65 68 39 26 24 34 50 66 74 72 46 34 31 40
WIND DIR S SW SW S SW SW SW SW SW W W W W NW NW NW NW W W W
WIND SPD 3 4 5 6 6 5 5 5 8 10 10 8 5 4 4 4 4 4 5 4
WIND GUST 21
CLOUDS CL CL FW SC B1 SC FW FW FW SC SC FW FW FW FW FW FW SC SC SC
CLOUDS(%) 2 5 24 47 56 39 19 20 14 27 27 20 18 13 6 10 10 30 30 26
VSBY 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10
POP 12HR 0 0 5 0 10
MIX HGT 3 4 4 <1 <1 <1 <1 <1 5 8 9 <1 <1 <1 <1 <1 5 9 8 <1
T WIND DIR S SW SW SW SW SW SW SW W W W N W NW NW NW NW NW W W
T WIND SPD 3 4 10 6 5 4 3 4 24 23 19 4 1 2 3 2 12 8 8 3
DISPERSION PR PR PR PR PR PR VP VP VP
ADI 15 23 54 5 4 2 2 4140197175 3 1 1 2 2 85 86 78 2
MAX LVORI 2 2 1 2 2 3 3 3 1 1 1 2 2 3 3 3 1 1 1 2
STABILITY A A A E E F F A B B B E F F F A A A A F
CEILING None None None None None None None None None None
STA PRES 29.30 29.18 29.13 29.09 29.05 28.98 28.99 28.99 29.00 28.91
Date Fri 04/24/26Sat 04/25/26Sun 04/26/26Mon 04/27/26
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 54 83 57 80 55 71 51 71
TEMP 59 58 80 76 61 60 74 71 60 56 69 66 55 52 68 66
DEWPT 48 47 46 48 49 49 56 56 55 52 51 48 48 47 50 50
RH 67 67 30 37 65 67 53 59 84 86 53 52 77 83 52 56
WIND SPD <15 <15 <15 <15 <15 <15 <15 <15
AVG CLOUDS FW FW FW SC SC SC B1 B2 B2 B1 SC B1 SC SC B1 B1
POP 12HR 5 5 10 60 50 30 20 30
RAIN SHWRS SC NM SC SC SC SC IS 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