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EXPERIMENTAL...FIRE WEATHER POINT FORECAST MATRICES
NATIONAL WEATHER SERVICE Blacksburg VA
631 AM EDT Sat Apr 18 2026
NCZ006-182000-
RAWS 310801
36.37N 79.29W Elev. 580 ft
631 AM EDT Sat Apr 18 2026
Date Sat 04/18/26 Sun 04/19/26 Mon 04/20/26
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 91 53 69 42 67
TEMP 61 82 89 90 83 75 73 72 63 62 62 65 58 50 45 42 45 59 65 67 60
DEWPT 52 56 53 52 53 52 56 56 49 43 36 29 27 26 26 28 29 33 30 25 23
MAX/MIN RH 27 60 26 56 21
RH 72 41 29 27 36 45 55 57 60 50 38 26 30 39 47 57 53 37 27 20 24
WIND DIR N S SW SW S S SW NW NW NW N NW NW NW W W W NW NW NW N
WIND SPD 0 2 6 6 3 4 4 5 10 10 9 8 4 2 2 2 3 6 9 9 5
WIND GUST 23 21
CLOUDS FW SC SC FW SC SC B1 B2 OV OV B2 B1 FW CL CL CL FW FW SC FW CL
CLOUDS(%) 22 28 30 25 37 41 59 79 95 89 82 53 15 4 5 5 13 12 27 12 5
VSBY 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10
POP 12HR 5 20 40 0 0
RAIN SHWRS SC SC IS IS
MIX HGT <1 4 8 8 <1 <1 <1 <1 2 3 4 7 <1
T WIND DIR S S SW SW S S SW SW NW NW NW NW NW
T WIND SPD 1 10 13 16 5 5 6 4 29 25 21 19 10
DISPERSION VP VP VP PR VP VP VP VP PR
ADI 1 54112138 3 4 5 3 78 83 84146 5
MAX LVORI 3 1 1 1 2 2 3 4 1 1 1 1 2
STABILITY A A B B F E E E C C C B F
CEILING None None None 4600 4000 None None
STA PRES 29.33 29.24 29.20 29.20 29.41 29.43
Date Tue 04/21/26Wed 04/22/26Thu 04/23/26Fri 04/24/26
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 35 69 48 84 54 84 57 89
TEMP 41 40 65 63 52 52 81 77 61 58 82 77 62 60 86 80
DEWPT 21 23 26 30 30 33 41 43 45 49 50 50 51 51 49 48
RH 44 50 23 29 43 48 24 30 56 72 33 39 67 72 28 33
WIND SPD <15 <15 <15 <15 <15 <15 <15 <15
AVG CLOUDS CL CL CL FW FW SC SC FW SC FW FW FW FW FW FW FW
POP 12HR 0 0 0 5 5 5 0 5
$$
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