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EXPERIMENTAL...FIRE WEATHER POINT FORECAST MATRICES
NATIONAL WEATHER SERVICE Blacksburg VA
501 AM EDT Wed Apr 22 2026
NCZ005-222000-
RAWS 310540
36.38N 79.70W Elev. 858 ft
501 AM EDT Wed Apr 22 2026
Date Wed 04/22/26 Thu 04/23/26 Fri 04/24/26
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 82 53 84 57 85
TEMP 52 72 81 81 71 63 59 55 57 75 82 83 76 66 61 58 60 78 84 85 78
DEWPT 40 42 39 40 43 44 45 44 45 47 47 46 47 48 50 49 50 50 47 46 47
MAX/MIN RH 21 69 27 75 26
RH 63 34 22 23 36 50 60 66 64 37 29 27 36 52 67 72 69 37 28 26 33
WIND DIR SW W W W NW W W W W NW W W W W W W W W W W W
WIND SPD 8 10 11 11 4 3 3 3 3 4 4 4 2 2 2 2 3 4 6 5 3
CLOUDS FW FW FW B1 B1 SC SC FW FW FW FW SC SC SC FW FW FW FW SC SC SC
CLOUDS(%) 21 19 15 52 55 37 30 9 6 7 22 32 35 35 21 12 15 22 31 30 29
VSBY 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10
POP 12HR 10 5 5 5 5
MIX HGT <1 4 9 9 <1 <1 <1 <1 <1 5 9 7 <1 <1 <1 <1 <1 8 11 11 <1
T WIND DIR SW W W W NE S W W W NW W W W SW W W W NW W W W
T WIND SPD 8 21 19 17 2 2 1 2 1 12 10 11 4 3 3 3 2 9 11 10 8
DISPERSION VP VP VP VP VP VP VP VP VP
ADI 8102101 64 2 1 1 1 1 86111 96 2 2 2 2 2 84119133 4
MAX LVORI 3 1 1 1 2 2 3 3 3 1 1 1 2 2 3 3 3 1 1 1 2
STABILITY B B C D E G G G A A A A G G G G A A B A G
CEILING None None None None None None None None None None
STA PRES 29.38 29.29 29.32 29.31 29.33 29.23 29.23 29.21 29.21 29.13
Date Sat 04/25/26Sun 04/26/26Mon 04/27/26Tue 04/28/26
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 59 83 53 71 50 71 55 77
TEMP 63 62 79 72 58 54 68 65 53 52 69 67 58 57 73 72
DEWPT 50 52 55 58 55 52 49 47 46 46 46 48 51 55 59 57
RH 62 70 44 61 90 93 51 52 77 80 44 50 77 93 62 59
WIND SPD <15 <15 <15 <15 <15 <15 <15 <15
AVG CLOUDS SC SC B1 B2 B2 B1 B1 SC SC B1 B1 B1 B1 B2 B2 B2
POP 12HR 10 60 50 30 20 20 50 60
RAIN SHWRS IS NM SC SC IS SC IS IS IS SC NM NM
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