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EXPERIMENTAL...FIRE WEATHER POINT FORECAST MATRICES
NATIONAL WEATHER SERVICE Blacksburg VA
631 PM EST Tue Jan 20 2026
NCZ001-210900-
RAWS 310142
36.40N 81.46W Elev. 4608 ft
631 PM EST Tue Jan 20 2026
Date 01/20/26 Wed 01/21/26 Thu 01/22/26 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
EST 3hrly 16 19 22 01 04 07 10 13 16 19 22 01 04 07 10 13 16 19 22 01 04 07
MIN/MAX TEMP 16 37 29 42 29
TEMP 17 18 18 18 20 27 35 35 30 32 33 31 33 33 37 39 34 32 30 32 32
DEWPT -5 -2 1 1 2 5 12 13 15 19 26 31 30 29 27 25 26 25 25 27 27
MIN/MAX RH 48 36 98 57 82
RH 36 40 46 46 45 38 38 40 53 58 75100 89 85 67 57 72 75 81 81 81
WIND DIR W W SW SW SW SW S S SW W W W W W W W W W W W NW
WIND SPD 12 9 8 9 10 11 12 12 11 14 18 21 21 17 12 10 9 9 9 10 10
CLOUDS CL CL CL CL FW FW FW FW SC B1 B1 B1 B1 B1 SC SC SC B1 B1 B2 OV
CLOUDS(%) 4 3 5 5 6 13 25 23 50 55 69 69 67 59 35 45 50 53 67 85 91
VSBY 10 10 10 10 10 10 10 10 10 10 9 6 10 10 10 10 7 7 6 4 4
POP 12HR 0 5 20 10 40
FRZG DRZL S
FRZG RAIN S S C
RAIN S S S S C
SNOW S S S C
MIX HGT <1 <1 <1 <1 <1 <1 2 1 <1 <1 <1 <1 <1 1 2 2 <1
T WIND DIR NW W W S S S S SW SW W W W W NW W W NW
T WIND SPD 11 4 2 4 6 13 11 10 8 8 6 10 11 13 20 10 4
DISPERSION FR PR PR PR FR GD GD GD PR PR PR FR
ADI 10 3 2 3 5 16 21 17 5 7 6 9 13 20 40 23 4
MAX LVORI 2 2 2 2 2 2 2 2 2 3 4 8 5 4 1 2 3
STABILITY D E E E C D D D E D D D D D D C D
CEILING None None None None 1100 400 None None None
STA PRES 26.92 26.89 26.89 26.82 26.80 26.76 26.81 26.78
Date 01/23Sat 01/24/26Sun 01/25/26Mon 01/26/26Tue 01/27/26
UTC 6hrly 18 00 06 12 18 00 06 12 18 00 06 12 18 00 06 12 18 00
EST 6hrly 13 19 01 07 13 19 01 07 13 19 01 07 13 19 01 07 13 19
MAX/MIN TEMP 33 16 20 13 25 10 19 4 26
TEMP 32 27 21 18 17 16 14 17 22 21 17 12 18 13 7 6 20 17
DEWPT 24 18 11 8 12 10 11 14 20 16 11 7 9 4 -1 -3 7 5
RH 72 68 65 64 80 77 88 88 92 81 77 80 67 67 69 66 56 58
WIND SPD <15 <15 <15 <15 <15 15> 15> 15> <15
AVG CLOUDS OV B2 B2 B2 OV OV OV OV OV B2 B1 B2 B1 SC SC SC SC FW
POP 12HR 40 50 80 90 70 30 10 5 5
RAIN C
SNOW C C C C L D D D L C C S
$$
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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