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EXPERIMENTAL...FIRE WEATHER POINT FORECAST MATRICES
NATIONAL WEATHER SERVICE Blacksburg VA
231 PM EDT Sat Apr 18 2026
VAZ018-190800-
RAWS 444002
37.56N 80.18W Elev. 2702 ft
231 PM EDT Sat Apr 18 2026
Date 04/18/26 Sun 04/19/26 Mon 04/20/26 Tue
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 44 59 39 56 33
TEMP 83 75 67 61 48 46 50 57 58 50 46 44 40 41 49 54 55 48 40 35 33 36
DEWPT 48 50 57 54 40 36 31 24 21 21 22 26 28 25 24 20 17 16 18 18 18 19
MIN/MAX RH 77 24 62 22 53
RH 30 41 70 78 74 68 48 28 23 31 38 49 62 52 37 26 22 27 41 49 53 50
WIND DIR SW SW W W NW NW NW NW NW NW W W W NW NW NW NW NW NW NW W SW
WIND SPD 9 4 8 8 18 20 18 18 16 8 4 5 5 8 10 10 10 5 2 1 1 1
WIND GUST 37 43 40 35 32 23 27 31 31 27 21
CLOUDS B1 B2 B2 B2 B2 OV B1 SC CL FW FW FW SC SC FW FW CL CL CL FW FW CL
CLOUDS(%) 68 72 83 80 87 93 65 41 3 9 6 19 42 27 15 9 4 3 3 6 6 3
VSBY 10 10 8 9 10 10 10 10 9 9 10 10 10 10 10 9 9 9 9 9 9
POP 12HR 70 10 10 5 0
RAIN SHWRS NM NM SC SC
TSTMS IS
MIX HGT 8 <1 <1 <1 1 2 3 5 5 2 <1 <1 <1 3 5 7 7 2
T WIND DIR SW S W W NW NW NW NW NW NW W W W NW NW NW NW NW
T WIND SPD 20 13 17 11 33 34 35 32 31 20 4 5 5 12 14 20 19 13
DISPERSION VP PR PR GD PR VP PR PR PR VP VP VP
ADI 102 9 15 10 30 69 90133130 14 2 3 4 44 83153144 6
MAX LVORI 1 2 3 4 3 1 1 1 1 2 2 2 3 1 1 1 1 2
STABILITY C E D D D D D C C E F F E B B B B F
CEILING 10100 3500 1300 3400 None None None None None None
STA PRES 27.63 27.62 27.67 27.75 27.80 27.87 27.88 27.94 27.93
Date 04/21Wed 04/22/26Thu 04/23/26Fri 04/24/26Sat 04/25/26
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 70 49 75 52 80 54 83 58 78
TEMP 65 61 52 53 73 66 55 55 77 70 57 57 80 73 61 60 76 68
DEWPT 26 33 35 39 42 42 44 47 46 44 43 46 47 47 46 49 53 51
RH 23 35 52 59 33 42 66 74 33 39 59 67 31 40 58 67 45 54
WIND SPD <15 <15 <15 <15 <15 <15 <15 <15 <15
AVG CLOUDS CL FW FW SC B1 B1 FW FW FW FW FW FW FW SC SC SC B1 B1
POP 12HR 0 5 20 5 10 0 10 20 50
RAIN SHWRS IS IS IS SC SC
TSTMS 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
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