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EXPERIMENTAL...FIRE WEATHER POINT FORECAST MATRICES
NATIONAL WEATHER SERVICE Blacksburg VA
531 AM EDT Tue May 19 2026
NCZ006-192000-
RAWS 310801
36.37N 79.29W Elev. 580 ft
531 AM EDT Tue May 19 2026
Date Tue 05/19/26 Wed 05/20/26 Thu 05/21/26
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 95 67 96 66 87
TEMP 71 85 94 94 86 76 73 68 70 86 95 95 86 75 71 67 69 81 85 80 71
DEWPT 64 66 60 57 58 58 60 61 62 64 59 57 59 61 63 64 65 66 63 63 60
MAX/MIN RH 29 79 28 93 47
RH 79 53 32 29 39 54 64 78 76 48 30 28 40 62 76 90 87 60 48 56 68
WIND DIR SW SW SW S S S SW SW SW SW SW SW S S N N N NE NE NE NE
WIND SPD 3 4 5 6 3 3 4 4 4 4 5 6 3 1 0 0 1 3 6 10 9
WIND GUST 20
CLOUDS CL CL CL CL FW FW FW FW FW FW SC SC B1 B1 B1 SC SC SC B2 B2 B2
CLOUDS(%) 2 1 4 4 8 7 23 23 10 8 35 35 66 54 54 39 48 47 87 87 86
VSBY 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10
POP 12HR 0 0 20 20 80
RAIN SHWRS IS IS IS IS IS IS O O O
TSTMS IS IS SC SC SC
MIX HGT 1 4 7 7 <1 <1 <1 <1 1 3 8 9 <1 <1 <1 <1 2 4 3 3 <1
T WIND DIR SW SW SW SW S S SW SW SW SW SW SW S NW NE NW N NE NE NE NE
T WIND SPD 9 11 12 14 8 9 6 6 11 9 9 12 3 8 2 1 5 17 17 14 12
DISPERSION VP VP VP VP VP VP VP VP PR
ADI 14 53103115 4 4 3 3 16 38 86111 2 4 1 1 13 78 60 47 11
MAX LVORI 4 1 1 1 2 2 3 4 3 1 1 1 2 3 4 7 4 1 1 1 3
STABILITY A A A B G G F F A A A B F F F G A A C C D
CEILING None None None None None None 2200 None None 1400
STA PRES 29.58 29.50 29.50 29.50 29.48 29.38 29.42 29.43 29.51 29.54
Date Fri 05/22/26Sat 05/23/26Sun 05/24/26Mon 05/25/26
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 59 81 63 84 63 84
TEMP 61 58 70 71 64 63 77 76 67 66 81 77 68 66 81 77
DEWPT 58 58 62 61 62 63 68 67 65 66 68 69 67 66 67 67
RH 90100 76 71 93100 74 74 93100 65 76 97100 63 71
WIND SPD <15 <15 <15 <15 <15 <15 <15 <15
AVG CLOUDS B2 B2 B2 B2 B2 B2 B2 B2 B2 B2 B2 B2 B2 B2 B2 B2
POP 12HR 80 50 50 70 60 60 50 60
RAIN SHWRS O NM SC SC SC SC SC NM NM SC SC NM SC IS IS NM
TSTMS SC IS IS 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