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EXPERIMENTAL...FIRE WEATHER POINT FORECAST MATRICES
NATIONAL WEATHER SERVICE Blacksburg VA
802 PM EDT Sat Apr 18 2026
VAZ024-190800-
RAWS 441631
37.63N 79.51W Elev. 865 ft
802 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 51 64 39 61 31
TEMP 74 69 64 53 54 61 62 54 48 44 40 44 53 58 60 53 43 36 32 35
DEWPT 54 57 46 39 34 28 23 22 23 26 27 27 24 20 17 17 19 21 21 21
MIN/MAX RH 66 22 61 19 63
RH 50 66 52 59 46 28 22 28 37 49 59 51 32 23 18 24 38 54 63 56
WIND DIR W W NW NW NW NW NW NW SW SW W NW NW NW NW NW N N N N
WIND SPD 3 3 9 11 11 14 12 4 3 4 4 3 6 10 9 4 2 1 1 1
WIND GUST 20 26 25 26 24 14 19 21 20 14
CLOUDS B2 B2 B2 OV B2 SC CL CL FW FW SC SC FW FW FW CL CL CL CL CL
CLOUDS(%) 76 75 82 93 73 39 4 5 7 13 35 27 13 12 6 2 3 4 4 3
VSBY 10 10 10 9 10 10 10 10 10 10 10 10 10 8 9 8 8 8 9
POP 12HR 50 30 5 5 0
RAIN SHWRS SC SC SC SC
TSTMS IS
MIX HGT <1 <1 2 3 4 7 7 1 <1 <1 <1 2 6 9 9 1
T WIND DIR SW W NW NW NW NW NW NW W SW W NW NW NW NW NW
T WIND SPD 9 8 29 26 28 25 25 12 3 3 3 11 12 18 18 11
DISPERSION VP VP PR VP VP VP VP VP VP VP VP
ADI 4 4 40 60111117118 6 2 2 2 34 87161160 5
MAX LVORI 2 3 1 1 1 1 1 2 2 2 3 1 1 1 1 2
STABILITY F F D D C C C F G F F A B B B F
CEILING 5500 2500 7900 None None None None None None
STA PRES 28.31 28.35 28.47 28.52 28.61 28.62 28.68 28.67
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 45 79 51 84 53 87 57 83
TEMP 65 63 50 49 77 72 56 54 81 75 59 57 85 78 63 59 81 73
DEWPT 25 32 34 39 43 43 46 47 48 47 47 48 47 48 49 51 53 52
RH 22 31 54 68 30 35 69 77 32 37 64 72 27 35 60 75 38 48
WIND SPD <15 <15 <15 <15 <15 <15 <15 <15 <15
AVG CLOUDS CL FW FW SC B1 B1 FW CL FW FW FW FW FW SC SC SC B1 B1
POP 12HR 0 5 20 5 5 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