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EXPERIMENTAL...FIRE WEATHER POINT FORECAST MATRICES
NATIONAL WEATHER SERVICE Blacksburg VA
231 PM EDT Tue Jul 21 2026
NCZ018-220800-
RAWS 311941
36.22N 81.63W Elev. 3254 ft
231 PM EDT Tue Jul 21 2026
Date 07/21/26 Wed 07/22/26 Thu 07/23/26 Fri
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 64 76 60 69 56
TEMP 79 75 73 67 66 66 69 73 73 69 66 64 62 62 65 68 67 63 61 59 57 59
DEWPT 68 67 67 66 65 65 67 68 67 66 65 64 62 62 63 64 63 61 60 59 57 58
MIN/MAX RH 100 79 100 86 100
RH 69 76 81 97 97 97 93 84 81 90 97100100100 93 87 87 93 97100100 96
WIND DIR SW SW W SW W W W W W W NW N N N E E E E E E E E
WIND SPD 9 6 5 4 4 4 5 4 4 3 1 1 1 2 4 4 4 4 3 2 2 3
WIND GUST 16 14
CLOUDS B1 B2 B2 B2 B2 B2 B2 OV B1 B1 B2 B2 B2 B2 B2 B2 B2 B2 B2 B2 B2 B2
CLOUDS(%) 69 87 82 72 87 84 81 96 68 61 81 74 77 73 73 82 82 75 78 73 77 78
VSBY 6 6 7 7 6 3 3 3 4 6 6 7 6 6 6 6 6 6 6 7 7
POP 12HR 60 80 50 70 40
RAIN SHWRS SC IS IS SC NM NM NM O SC SC SC SC SC NM NM NM NM SC SC SC SC SC
TSTMS SC IS IS SC SC IS SC NM SC SC IS SC IS
MIX HGT 3 <1 <1 <1 <1 1 1 2 2 <1 <1 <1 <1 <1 2 2 2 1
T WIND DIR SW SW SW SW SW W W S SW SW NW NW N N E E SE E
T WIND SPD 14 4 8 8 10 13 4 4 5 2 4 5 9 8 9 4 4 5
DISPERSION PR PR VP VP VP VP VP VP VP VP VP VP
ADI 46 3 5 5 7 19 9 12 13 1 2 3 4 8 22 12 11 4
MAX LVORI 3 4 4 7 8 5 6 5 4 7 8 9 9 8 4 5 5 6
STABILITY C E E E E C C C C F F F F B C C C E
CEILING 1100 1200 0 100 400 500 100 200 200 200
STA PRES 26.81 26.80 26.78 26.85 26.84 26.84 26.88 26.95 26.97
Date 07/24Sat 07/25/26Sun 07/26/26Mon 07/27/26Tue 07/28/26
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 69 59 69 60 78 63 80 63 79
TEMP 65 66 63 61 66 65 62 63 75 73 65 66 78 74 66 65 77 72
DEWPT 63 62 62 61 66 64 62 63 65 65 63 64 65 65 63 62 64 63
RH 93 87 97100100 97100100 71 76 93 93 64 74 90 90 64 73
WIND SPD <15 <15 <15 <15 <15 <15 <15 <15 <15
AVG CLOUDS B2 B2 B2 B2 B2 OV B1 B1 SC B1 FW SC SC SC B1 SC SC B1
POP 12HR 60 80 80 40 30 10 20 30 30
RAIN SHWRS SC NM SC O NM O SC IS IS SC IS SC IS IS SC
TSTMS SC IS IS SC NM IS IS SC IS IS IS SC
$$
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