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EXPERIMENTAL...FIRE WEATHER POINT FORECAST MATRICES
NATIONAL WEATHER SERVICE Blacksburg VA
431 PM EDT Tue Apr 21 2026
NCZ005-220800-
RAWS 310540
36.38N 79.70W Elev. 858 ft
431 PM EDT Tue Apr 21 2026
Date 04/21/26 Wed 04/22/26 Thu 04/23/26 Fri
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 48 84 52 85 57
TEMP 67 62 54 52 50 53 72 81 82 73 63 58 55 57 75 82 84 75 66 62 58 61
DEWPT 28 32 32 33 35 38 43 40 40 41 43 43 43 45 49 47 46 48 47 47 48 48
MIN/MAX RH 61 22 67 27 72
RH 23 32 43 48 56 57 35 23 22 31 48 57 64 64 40 29 27 38 50 58 69 62
WIND DIR SW S S SW SW SW SW W W W W W W W NW W W W W W W W
WIND SPD 6 4 5 6 6 8 10 12 11 5 3 3 3 3 4 4 4 3 3 3 3 3
WIND GUST 23
CLOUDS FW SC SC SC FW FW FW FW SC B1 SC FW FW FW FW FW SC SC SC FW FW FW
CLOUDS(%) 22 43 42 26 13 14 19 16 33 54 36 16 13 7 8 14 28 29 30 17 11 20
VSBY 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10
POP 12HR 0 10 5 5 5
MIX HGT 4 <1 <1 <1 <1 <1 4 9 9 <1 <1 <1 <1 <1 6 10 11 <1
T WIND DIR SW S S S SW SW W W W NW E W W W NW NW W SW
T WIND SPD 11 5 5 5 6 6 25 20 20 2 1 2 3 3 13 10 9 3
DISPERSION VP PR PR PR PR VP VP VP VP VP VP VP
ADI 59 4 4 3 3 7119109109 2 1 1 2 3 94113107 2
MAX LVORI 1 2 2 2 3 3 1 1 1 2 2 3 3 3 1 1 1 2
STABILITY B E E F F B B C C E G G G A A A A G
CEILING None None None None None None None None None
STA PRES 29.46 29.41 29.38 29.28 29.30 29.30 29.32 29.22
Date 04/24Sat 04/25/26Sun 04/26/26Mon 04/27/26Tue 04/28/26
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 86 59 83 54 72 48 73 54 75
TEMP 84 78 64 61 80 72 60 55 69 66 53 51 70 67 58 56 69 69
DEWPT 43 48 49 51 55 57 56 53 50 47 47 46 47 48 49 53 58 56
RH 24 35 58 70 42 59 87 93 51 50 80 83 44 50 72 90 68 63
WIND SPD <15 <15 <15 <15 <15 <15 <15 <15 <15
AVG CLOUDS SC SC SC SC B1 B2 B2 B1 B1 B1 SC SC B1 SC SC B1 B2 B1
POP 12HR 10 10 70 70 30 20 20 40 60
RAIN SHWRS SC NM NM SC SC SC IS IS IS IS SC SC NM SC
TSTMS IS 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