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EXPERIMENTAL...FIRE WEATHER POINT FORECAST MATRICES
NATIONAL WEATHER SERVICE Blacksburg VA
901 PM EDT Fri Sep 18 2026
VAZ046-190800-
RAWS 441101
37.39N 78.80W Elev. 804 ft
901 PM EDT Fri Sep 18 2026
Date 09/18/26 Sat 09/19/26 Sun 09/20/26 Mon
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 66 78 66 84 67
TEMP 72 70 67 66 70 74 77 73 68 67 66 66 74 80 83 78 71 69 68 68
DEWPT 70 68 65 64 64 65 66 67 66 66 65 66 68 69 69 71 70 69 68 68
MIN/MAX RH 95 69 98 62 100
RH 93 93 93 93 81 74 69 81 93 97 97100 82 69 63 79 97100100100
WIND DIR NE NE NE NE NE NE NE NE E SE SE S S SW SW SW SW SW NE N
WIND SPD 5 5 8 9 8 5 5 3 2 2 1 2 5 6 5 3 3 3 3 4
CLOUDS B2 OV B2 B2 B2 B2 SC B1 B2 B1 B2 B2 B1 B1 B1 SC B1 B1 SC B1
CLOUDS(%) 80 92 81 80 71 70 47 57 75 69 84 77 64 58 58 49 54 57 49 58
VSBY 10 10 9 10 10 10 10 10 10 10 10 10 10 7 7 7
POP 12HR 20 10 5 20 20
RAIN SHWRS IS IS IS IS IS
TSTMS IS IS
MIX HGT <1 <1 1 <1 2 2 3 <1 <1 <1 <1 <1 3 4 4 <1
T WIND DIR N N N NE NE NE NE NE E N S S SW SW W SW
T WIND SPD 4 5 12 14 9 6 5 6 5 0 2 3 13 11 16 9
DISPERSION PR PR PR VP VP VP VP VP VP VP VP
ADI 3 4 11 17 17 14 21 3 3 0 1 3 32 32 42 4
MAX LVORI 6 6 5 5 3 4 3 5 6 9 8 9 3 3 1 4
STABILITY E E D D D D B F F F F C D D D F
CEILING 1000 2100 None 2200 3400 3900 None None
STA PRES 29.36 29.41 29.38 29.38 29.34 29.30 29.20
Date 09/21Tue 09/22/26Wed 09/23/26Thu 09/24/26Fri 09/25/26
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 83 64 71 58 64 57 67 55 71
TEMP 82 75 65 64 69 66 61 58 63 61 57 57 66 61 56 56 69 64
DEWPT 69 68 65 64 67 65 61 58 62 61 57 57 61 61 56 56 59 60
RH 65 79100100 93 97100100 97100100100 84100100100 70 87
WIND SPD <15 <15 <15 <15 <15 <15 <15 <15 <15
AVG CLOUDS B1 B1 B2 B2 B2 B2 B2 B2 B2 B2 B2 B2 B2 B2 B1 B1 B1 SC
POP 12HR 50 70 60 60 50 40 30 20 20
RAIN SHWRS SC NM NM SC NM NM SC SC SC SC SC SC SC IS IS IS IS
TSTMS SC 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