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EXPERIMENTAL...FIRE WEATHER POINT FORECAST MATRICES
NATIONAL WEATHER SERVICE Blacksburg VA
801 AM EDT Wed May 20 2026
NCZ003-202000-
RAWS 310301
36.48N 80.86W Elev. 1300 ft
801 AM EDT Wed May 20 2026
Date Wed 05/20/26 Thu 05/21/26 Fri 05/22/26
UTC 3hrly 09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00
EDT 3hrly 05 08 11 14 17 20 23 02 05 08 11 14 17 20 23 02 05 08 11 14 17 20
MAX/MIN TEMP 92 62 84 55 65
TEMP 86 90 90 82 71 67 64 66 79 80 75 70 64 61 58 57 61 62 64 64
DEWPT 61 59 59 62 63 62 61 63 66 67 69 67 62 59 58 57 61 62 64 63
MAX/MIN RH 35 94 59 100 96
RH 43 35 35 51 76 84 90 90 64 65 82 90 93 93100100100100100 97
WIND DIR N S W W NW N N N E SE E E E E E E E E E E
WIND SPD 0 3 4 1 1 0 0 0 1 3 3 3 3 1 1 1 3 4 4 3
CLOUDS CL SC SC SC SC SC B1 B1 B1 B2 OV OV OV OV OV B2 B2 B2 OV OV
CLOUDS(%) 5 40 50 50 40 45 58 62 67 80 88 99 99 88 88 83 86 86 90 91
VSBY 10 10 10 10 10 10 10 10 10 10 7 3 1 3 4 2 10 10 10 10
POP 12HR 30 30 100 100 70
RAIN SHWRS IS SC IS IS IS IS NM O O O O O NM NM NM NM O
TSTMS IS SC IS IS SC SC IS IS IS IS
MIX HGT 5 8 7 <1 <1 <1 <1 <1 3 4 1 <1 1 1 1 1 1 1 1 1
T WIND DIR W S S SW SW SW N NW SW SW E NE NE NE NE NE NE NE NE NE
T WIND SPD 5 9 13 13 4 2 1 1 5 3 11 13 12 12 10 11 11 8 8 8
DISPERSION VP VP VP VP VP VP VP VP VP
ADI 38 90111 6 2 1 1 1 21 17 21 6 6 6 5 19 18 14 15 4
MAX LVORI 1 1 1 2 4 5 7 6 2 2 3 5 7 7 9 5 5 5 5 9
STABILITY A A A F G F F B B B B F F F F B B C C F
CEILING None None None None 3700 3200 600 600 700 700
STA PRES 28.22 28.14 28.15 28.15 28.19 28.19 28.27 28.27 28.30 28.30
Date Sat 05/23/26Sun 05/24/26Mon 05/25/26Tue 05/26/26
UTC 6hrly 06 12 18 00 06 12 18 00 06 12 18 00 06 12 18 00
EDT 6hrly 02 08 14 20 02 08 14 20 02 08 14 20 02 08 14 20
MIN/MAX TEMP 55 74 58 78 60 80 61 81
TEMP 60 59 70 70 63 62 76 74 65 64 78 75 66 65 79 76
DEWPT 59 59 67 68 62 62 70 70 63 64 71 71 64 65 71 71
RH 96100 90 93 97100 82 87 93100 79 87 93100 77 85
WIND SPD <15 <15 <15 <15 <15 <15 <15 <15
AVG CLOUDS OV OV OV B2 B2 B2 B2 B2 B2 B2 B2 OV B2 B2 B2 OV
POP 12HR 90 80 60 70 40 80 40 80
RAIN SHWRS O O O NM NM SC SC NM SC SC SC O SC IS NM O
TSTMS IS IS SC SC SC IS IS SC 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