
Scatterd to numerous thunderstorms, some severe, are expected across the area Tuesday afternoon into Tuesday evening. Swaths of damaging wind gusts should be the primary severe risk, but an isolated tornado cannot be ruled out. Also localized flash flooding will be possible. Read More >
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EXPERIMENTAL...FIRE WEATHER POINT FORECAST MATRICES
NATIONAL WEATHER SERVICE Blacksburg VA
301 PM EDT Mon Jul 20 2026
VAZ046-210800-
RAWS 441101
37.39N 78.80W Elev. 804 ft
301 PM EDT Mon Jul 20 2026
Date 07/20/26 Tue 07/21/26 Wed 07/22/26 Thu
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 70 87 69 86 64
TEMP 83 79 73 72 72 73 82 86 83 79 75 73 72 72 79 84 83 78 72 69 66 65
DEWPT 72 72 71 71 70 72 75 74 73 74 73 72 72 72 75 74 73 72 69 66 62 60
MIN/MAX RH 97 68 100 70 92
RH 70 79 93 97 93 97 79 68 72 85 94 97100100 88 72 72 82 90 90 87 84
WIND DIR SE SE S SW SW SW SW SW SW SW SW SW SW SW SW SW SW SW N NE NE NE
WIND SPD 4 5 4 4 5 8 10 12 12 11 10 10 11 10 10 10 9 5 4 5 9 8
WIND GUST 25 24 21 21 21 20 20 19
CLOUDS B1 B1 OV B2 OV B2 B1 B1 B2 OV B1 OV B2 B2 B2 B2 B2 B1 B1 SC B1 B1
CLOUDS(%) 61 55 89 71 88 71 62 68 86 93 63 93 86 83 83 73 73 54 54 47 54 54
VSBY 10 10 9 7 7 8 10 10 10 10 6 3 3 10 10 10 3 10 10 1 10
POP 12HR 50 60 90 70 30
RAIN SHWRS SC SC SC IS IS IS SC NM SC SC O O NM NM NM NM SC SC
TSTMS SC SC SC IS SC NM SC SC SC IS IS SC SC SC
MIX HGT 4 1 <1 <1 <1 1 3 4 3 <1 <1 <1 <1 1 3 4 3 <1
T WIND DIR SE SE S S S SW SW SW SW SW SW SW S SW W SW W W
T WIND SPD 8 16 10 9 6 12 17 26 28 9 26 3 18 18 28 19 12 6
DISPERSION PR VP VP PR FR FR FR FR PR VP PR PR
ADI 31 11 7 6 5 20 54 98 98 8 24 3 16 25 94 72 41 5
MAX LVORI 3 4 6 6 7 5 3 1 3 4 5 8 5 4 4 3 3 4
STABILITY C E E E E C C C C D D D D C C C C E
CEILING 3100 1500 2100 11000 7300 200 1400 1700 None
STA PRES 29.20 29.16 29.17 29.16 29.16 29.11 29.13 29.14
Date 07/23Fri 07/24/26Sat 07/25/26Sun 07/26/26Mon 07/27/26
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 80 60 80 62 80 64 85 67 91
TEMP 78 73 61 63 78 74 65 65 78 74 66 67 83 79 70 71 89 84
DEWPT 61 61 59 59 62 63 63 64 66 67 66 67 70 71 68 69 72 71
RH 56 66 93 87 58 69 93 97 67 79100100 65 77 93 93 57 65
WIND SPD <15 <15 <15 <15 <15 <15 <15 <15 <15
AVG CLOUDS SC SC SC SC SC SC B1 B2 B1 B1 SC SC SC SC FW FW SC SC
POP 12HR 10 20 10 30 30 20 20 10 20
RAIN SHWRS IS IS SC IS SC IS IS IS IS IS
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