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EXPERIMENTAL...FIRE WEATHER POINT FORECAST MATRICES
NATIONAL WEATHER SERVICE Blacksburg VA
931 PM EDT Mon Aug 17 2026
NCZ001-180800-
RAWS 310142
36.40N 81.46W Elev. 4608 ft
931 PM EDT Mon Aug 17 2026
Date 08/17/26 Tue 08/18/26 Wed 08/19/26 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 64 75 58 77 63
TEMP 68 67 67 65 67 73 72 66 63 61 60 61 70 77 75 68 65 64 65 66
DEWPT 64 64 64 63 63 62 62 61 61 60 58 58 57 56 56 58 58 58 57 58
MIN/MAX RH 96 65 96 48 80
RH 87 90 90 93 87 68 71 84 93 97 93 90 63 48 52 70 78 81 75 75
WIND DIR W NW NW NW NW NW NW NW N NW NW NW W NW NW NW W W W W
WIND SPD 13 16 16 14 10 8 9 9 8 6 5 5 3 4 5 3 4 5 4 5
CLOUDS B2 B2 B1 B1 SC SC FW FW FW FW SC SC FW FW FW FW FW FW FW SC
CLOUDS(%) 74 72 60 55 42 32 22 25 22 20 26 30 10 8 9 20 20 19 17 43
VSBY 8 7 6 5 10 10 10 10 10 7 3 10 10 10 10 10 10 10 10 7
POP 12HR 40 5 0 0 5
RAIN SHWRS IS
TSTMS
Obvis F
MIX HGT <1 <1 <1 1 2 3 4 1 <1 <1 <1 <1 3 5 5 <1
T WIND DIR W NW NW NW NW NW NW NW NW NW N N N N N NW
T WIND SPD 1 3 6 9 13 10 11 14 11 10 11 12 11 9 9 6
DISPERSION FR GD GD PR PR PR PR VP VP PR VP
ADI 1 3 6 13 41 44 51 10 8 5 5 12 41 52 58 3
MAX LVORI 6 6 5 5 4 3 1 4 5 6 6 5 1 1 1 3
STABILITY D D D D B B B E E F F A A A A G
CEILING 400 None None None None None None None
STA PRES 26.69 26.71 26.68 26.71 26.70 26.72 26.72
Date 08/20Fri 08/21/26Sat 08/22/26Sun 08/23/26Mon 08/24/26
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 76 62 73 60 71 59 72 56 71
TEMP 76 70 65 63 70 65 63 60 69 65 61 59 69 64 58 56 68 63
DEWPT 61 62 61 61 64 62 61 60 61 60 59 58 58 55 55 54 54 53
RH 60 76 87 93 81 90 93100 76 84 93 96 68 73 90 93 61 70
WIND SPD <15 <15 <15 <15 <15 <15 <15 <15 <15
AVG CLOUDS SC B2 B1 B1 B1 OV B1 B1 B1 B1 B1 SC SC SC SC FW SC SC
POP 12HR 50 30 80 40 50 20 20 0 10
RAIN SHWRS IS SC SC IS SC O SC SC SC IS IS
TSTMS SC SC SC SC IS IS SC 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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