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EXPERIMENTAL...FIRE WEATHER POINT FORECAST MATRICES
NATIONAL WEATHER SERVICE Blacksburg VA
801 PM EDT Thu May 21 2026
NCZ003-220800-
RAWS 310302
36.35N 80.48W Elev. 1076 ft
801 PM EDT Thu May 21 2026
Date 05/21/26 Fri 05/22/26 Sat 05/23/26 Sun
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 57 61 56 65 61
TEMP 64 62 59 58 60 60 61 60 58 57 56 56 58 63 65 65 63 62 61 64
DEWPT 63 60 59 58 59 60 61 59 58 57 56 56 58 62 64 63 63 62 61 64
MIN/MAX RH 100 98 100 94 100
RH 97 93100100 96100100 96100100100100100 97 97 93100100100100
WIND DIR NE NE NE NE E E E NE NE E NE E E E E E E E E SE
WIND SPD 14 11 10 10 8 6 8 11 11 11 11 9 5 5 4 5 4 4 3 3
CLOUDS OV OV OV OV OV OV OV OV OV OV OV OV OV OV OV OV OV OV OV OV
CLOUDS(%) 90 91 94 93 94 92 95 93 92 98 98 98 98 95 95 94 94 91 91 88
VSBY 4 5 5 4 2 5 4 3 3 2 4 2 2 2 2 2 2 1 2 3
POP 12HR 80 50 100 100 90
RAIN SHWRS SC SC NM SC SC IS SC SC SC O O O O O O O O SC SC IS
TSTMS IS IS IS IS IS IS IS SC IS
MIX HGT 1 1 1 1 1 2 2 1 1 1 1 1 1 1 1 <1
T WIND DIR NE NE NE NE NE NE NE NE NE NE NE NE NE NE NE NE
T WIND SPD 14 11 9 9 13 11 13 11 13 11 10 10 10 5 4 4
DISPERSION GD FR FR FR FR FR FR PR VP VP VP
ADI 13 10 8 14 25 23 30 10 12 10 9 13 14 8 6 3
MAX LVORI 5 6 8 5 5 5 4 7 5 7 8 5 5 6 6 8
STABILITY D D D C C C C D D D D C C C C E
CEILING 2100 500 600 600 600 600 600 600 600
STA PRES 29.04 29.07 29.12 29.10 29.13 29.13 29.13 29.10
Date 05/24Mon 05/25/26Tue 05/26/26Wed 05/27/26Thu 05/28/26
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 78 62 76 63 79 62 78 61 77
TEMP 75 73 66 66 74 71 66 66 76 73 67 65 76 73 65 65 75 71
DEWPT 70 70 66 66 71 70 66 66 71 70 66 65 70 69 64 64 67 67
RH 84 90100100 90 97100100 85 90 97100 82 87 97 97 76 87
WIND SPD <15 <15 <15 <15 <15 <15 <15 <15 <15
AVG CLOUDS B2 B2 B2 OV B2 OV OV B2 B2 OV B2 B2 B2 OV B2 B1 B1 B1
POP 12HR 70 80 90 80 90 60 80 50 50
RAIN SHWRS IS NM O SC SC O O SC NM O NM SC SC O SC SC SC SC
TSTMS SC SC SC SC SC 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
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