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EXPERIMENTAL...FIRE WEATHER POINT FORECAST MATRICES
NATIONAL WEATHER SERVICE Blacksburg VA
331 AM EDT Mon Apr 20 2026
VAZ018-202000-
RAWS 444002
37.56N 80.18W Elev. 2702 ft
331 AM EDT Mon Apr 20 2026
Date Mon 04/20/26 Tue 04/21/26 Wed 04/22/26
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 57 34 71 52 74
TEMP 42 42 50 55 56 46 40 35 34 37 55 67 71 63 56 54 53 56 69 74 72 65
DEWPT 27 30 26 19 18 18 19 18 18 20 25 28 34 36 37 39 39 41 45 45 46 45
MAX/MIN RH 22 53 23 60 36
RH 55 62 39 24 22 32 42 49 51 50 31 23 26 36 49 57 59 57 42 35 39 48
WIND DIR NW NW NW NW NW NW NW NW NW SW S SW SW SW SW W W W W W W NW
WIND SPD 6 9 10 10 9 5 2 1 1 1 2 4 5 3 4 5 6 6 10 11 9 5
WIND GUST 23 27 31 29 25 19 12 17 16 18 20 24 27 31 29 26 21
CLOUDS FW B1 FW FW FW CL FW CL FW CL FW FW FW FW SC SC SC B1 SC B1 B1 FW
CLOUDS(%) 15 58 15 20 6 5 7 5 6 4 7 12 15 19 29 33 39 56 46 68 56 25
VSBY 10 10 10 10 10 10 10 10 9 10 10 9 9 9 10 10 9
POP 12HR 5 0 0 5 30
RAIN SHWRS IS IS SC SC
TSTMS IS
MIX HGT <1 3 5 7 6 2 <1 <1 <1 <1 4 5 6 <1
T WIND DIR W NW NW NW NW NW NW NW W S W W SW S
T WIND SPD 5 16 20 20 20 18 5 2 2 4 5 9 9 5
DISPERSION PR PR VP VP VP VP VP PR PR PR
ADI 4 57120 97 95 8 3 1 1 5 26 54 64 3
MAX LVORI 3 1 1 1 1 2 2 2 2 2 2 1 1 2
STABILITY E B B C C F G G G A A A A G
CEILING None None None None None None None
STA PRES 27.95 27.96 28.01 28.04 28.04 27.91
Date Thu 04/23/26Fri 04/24/26Sat 04/25/26Sun 04/26/26
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 53 80 54 82 59 78 54 71
TEMP 55 55 78 70 58 57 81 73 61 61 77 69 59 56 69 64
DEWPT 45 48 49 47 45 47 46 46 47 50 53 52 49 50 50 49
RH 69 77 36 44 62 69 29 38 60 67 43 55 69 80 51 58
WIND SPD <15 <15 <15 <15 <15 <15 <15 <15
AVG CLOUDS FW FW FW FW FW FW FW SC SC SC B1 B2 B2 B1 B1 B1
POP 12HR 10 10 0 10 20 70 60 50
RAIN SHWRS IS IS SC NM NM SC SC SC
TSTMS 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