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EXPERIMENTAL...FIRE WEATHER POINT FORECAST MATRICES
NATIONAL WEATHER SERVICE Blacksburg VA
131 AM EDT Sat Apr 18 2026
NCZ001-190800-
RAWS 310142
36.40N 81.46W Elev. 4608 ft
131 AM EDT Sat Apr 18 2026
Date 04/17/26 Sat 04/18/26 Sun 04/19/26 Mon
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 55 72 38 49 37
TEMP 56 55 57 66 72 71 65 60 53 48 41 38 43 45 44 41 39 38 40
DEWPT 42 42 42 43 45 49 54 54 49 45 38 30 21 18 19 21 22 25 27
MIN/MAX RH 60 39 92 33 61
RH 59 61 57 43 38 46 68 81 86 89 89 73 41 33 36 44 50 59 59
WIND DIR S SW SW SW SW SW SW W W NW NW NW NW NW NW NW NW W NW
WIND SPD 5 5 6 10 12 12 12 14 19 29 37 33 26 25 25 21 18 18 18
CLOUDS SC SC FW FW SC B1 B1 B1 B2 OV OV B1 B1 SC CL CL CL FW FW
CLOUDS(%) 34 32 25 21 39 62 64 67 85 88 88 67 53 28 4 3 5 10 9
VSBY 10 10 10 10 10 10 10 10 8 8 10 10 10 10 10 10 10 10
POP 12HR 0 20 70 30 0
RAIN SHWRS IS SC SC NM SC SC SC
TSTMS IS SC
MIX HGT <1 <1 <1 4 6 6 <1 <1 <1 1 1 2 4 4 1
T WIND DIR W W S SW SW SW SW W NW NW NW NW NW NW NW
T WIND SPD 1 1 2 18 14 16 16 13 17 28 34 37 37 31 13
DISPERSION PR PR FR GD GD GD GD GD GD GD
ADI 1 1 2 85 68 51 14 12 15 26 55 74139118 12
MAX LVORI 4 3 3 1 1 1 2 3 4 4 3 3 1 1 2
STABILITY F F B B C D D D D D D D C C D
CEILING None None 2400 700 300 300 None None
STA PRES 26.68 26.68 26.62 26.60 26.63 26.70 26.72
Date 04/20Tue 04/21/26Wed 04/22/26Thu 04/23/26Fri 04/24/26
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 51 34 61 47 66 48 69 51 70
TEMP 49 47 38 38 58 55 49 51 64 60 52 53 66 62 53 55 67 64
DEWPT 23 21 22 24 29 34 34 36 36 38 39 41 41 43 43 44 43 44
RH 36 35 52 57 33 45 56 56 35 44 61 64 40 50 69 66 42 48
WIND SPD 15> <15 <15 <15 <15 <15 <15 <15 <15
AVG CLOUDS FW FW CL CL CL FW SC SC SC SC FW FW FW FW FW FW FW SC
POP 12HR 5 0 0 0 10 5 10 5 20
RAIN SHWRS IS
TSTMS IS
$$
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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