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EXPERIMENTAL...FIRE WEATHER POINT FORECAST MATRICES
NATIONAL WEATHER SERVICE Blacksburg VA
801 AM EDT Wed May 20 2026
NCZ006-202000-
RAWS 310801
36.37N 79.29W Elev. 580 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 97 67 89 57 69
TEMP 86 95 96 87 77 73 68 70 83 87 80 71 63 62 59 59 62 66 68 66
DEWPT 64 58 57 60 61 62 63 65 66 65 66 64 61 60 59 59 62 62 63 62
MAX/MIN RH 28 85 47 100 82
RH 48 29 27 40 58 68 84 84 57 48 62 79 93 93100100100 87 84 87
WIND DIR SW SW S S S SW SW N NE NE NE NE NE NE NE NE NE NE NE NE
WIND SPD 4 4 6 3 3 1 1 1 1 3 9 8 4 3 4 4 4 5 6 4
CLOUDS CL CL FW FW SC SC FW B1 SC B2 B2 OV OV B2 B2 OV B2 B2 B2 OV
CLOUDS(%) 1 3 6 13 30 26 21 66 45 83 82 98 95 86 87 89 86 86 86 91
VSBY 10 10 10 10 10 10 10 10 10 10 10 3 2 2 3 4 10 10 10 10
POP 12HR 0 10 80 90 50
RAIN SHWRS NM O O NM NM SC SC SC SC O
TSTMS SC SC IS IS IS
MIX HGT 4 8 9 <1 <1 <1 <1 1 4 6 2 2 1 1 1 1 1 2 2 1
T WIND DIR W SW SW S S S S SW SW E N NE NE NE NE NE NE NE NE NE
T WIND SPD 12 11 13 9 6 5 4 9 8 10 18 14 11 10 8 10 10 11 10 9
DISPERSION VP VP VP VP PR VP VP VP VP
ADI 62109124 4 3 3 2 13 38 69 50 20 8 5 5 17 18 24 23 6
MAX LVORI 1 1 1 2 3 3 5 4 1 1 1 3 6 7 9 5 5 4 3 5
STABILITY A A B G G G G A A B C D E F E C C C C E
CEILING None None None None None 1800 700 700 800 800
STA PRES 29.45 29.35 29.38 29.40 29.42 29.49 29.55 29.55 29.59 29.58
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 57 78 61 82 63 84 65 85
TEMP 61 61 74 71 66 65 79 76 68 67 82 78 70 69 83 79
DEWPT 61 61 67 67 65 65 69 69 66 67 70 70 67 68 69 70
RH 100100 79 87 97100 72 79 93100 67 76 90 97 63 74
WIND SPD <15 <15 <15 <15 <15 <15 <15 <15
AVG CLOUDS OV B2 B2 OV B2 B2 B2 B2 B2 B2 B2 B2 B1 B2 B2 B2
POP 12HR 80 80 70 70 60 70 50 70
RAIN SHWRS O NM SC O NM SC SC NM NM IS IS NM SC IS IS NM
TSTMS IS SC SC SC SC SC SC 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