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EXPERIMENTAL...FIRE WEATHER POINT FORECAST MATRICES
NATIONAL WEATHER SERVICE Blacksburg VA
801 AM EDT Thu May 21 2026
NCZ006-212000-
RAWS 310801
36.37N 79.29W Elev. 580 ft
801 AM EDT Thu May 21 2026
Date Thu 05/21/26 Fri 05/22/26 Sat 05/23/26
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 90 57 68 56 71
TEMP 85 90 82 72 64 63 60 60 63 66 68 66 61 60 59 59 64 68 71 70
DEWPT 66 64 66 66 63 62 60 60 63 63 63 62 61 60 57 59 64 67 68 67
MAX/MIN RH 42 100 83 100 88
RH 53 42 58 81 97 97100100100 90 84 87100100 93100100 97 90 90
WIND DIR S SE NE NE NE NE NE NE NE NE NE NE NE NE NE E E E NE NE
WIND SPD 1 3 6 6 5 3 3 4 5 5 6 5 3 2 3 3 3 4 3 1
CLOUDS B1 B1 B2 OV OV OV OV OV OV OV OV OV OV OV OV OV OV OV OV OV
CLOUDS(%) 51 51 85 96 96 97 95 95 93 93 92 98 91 95 95 96 96 94 94 94
VSBY 10 10 9 4 4 5 5 5 6 5 5 2 10 10 10 10 10 10 10 10
POP 12HR 100 90 60 90 90
RAIN SHWRS IS O O NM NM SC SC SC SC SC O O O O O O O O O
TSTMS IS SC SC IS
Obvis F F F F PF
MIX HGT 3 8 3 1 1 1 1 1 1 2 2 1 1 <1 1 <1 1 1 1 1
T WIND DIR S S S N N N NE NE NE NE NE NE NE NE NE N NE NE NE NE
T WIND SPD 5 8 14 17 12 10 9 11 10 11 12 11 8 8 8 6 5 4 2 4
DISPERSION PR PR VP VP PR VP VP VP VP
ADI 22 64 50 12 8 5 4 18 18 23 27 8 4 4 4 8 8 7 4 2
MAX LVORI 2 1 1 4 6 7 9 5 5 4 4 5 9 9 8 8 8 8 6 6
STABILITY B B C E E F F C C C C E F F F B B C B F
CEILING None 2000 700 700 700 700 300 300 700 700
STA PRES 29.42 29.35 29.45 29.47 29.54 29.53 29.55 29.56 29.60 29.57
Date Sun 05/24/26Mon 05/25/26Tue 05/26/26Wed 05/27/26
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 60 82 65 84 65 84 64 84
TEMP 64 65 78 76 69 69 82 78 70 69 82 78 69 68 82 78
DEWPT 64 65 70 68 65 69 70 70 68 69 70 70 67 68 68 68
RH 100100 76 76 87100 67 76 93100 67 76 93100 63 71
WIND SPD <15 <15 <15 <15 <15 <15 <15 <15
AVG CLOUDS OV OV B2 B2 B2 B2 B2 B2 B2 B2 B2 B2 B2 B2 B2 B2
POP 12HR 90 80 60 70 60 80 60 70
RAIN SHWRS O NM SC O NM SC SC NM NM SC SC O NM SC SC NM
TSTMS SC SC SC SC 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