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EXPERIMENTAL...FIRE WEATHER POINT FORECAST MATRICES
NATIONAL WEATHER SERVICE Blacksburg VA
231 AM EDT Wed May 21 2025
NCZ001-220800-
RAWS 310142
36.40N 81.46W Elev. 4608 ft
231 AM EDT Wed May 21 2025
Date 05/20/25 Wed 05/21/25 Thu 05/22/25 Fri
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 56 66 50 59 43
TEMP 59 60 60 65 64 58 54 52 51 51 54 59 57 53 48 45 44 43
DEWPT 57 55 55 52 49 46 46 45 44 43 42 42 42 41 41 40 39 38
MIN/MAX RH 98 58 78 53 84
RH 93 84 84 63 58 64 74 77 77 74 64 53 57 64 77 82 82 82
WIND DIR W W W W W W W W W W W W W W W W NW NW
WIND SPD 11 14 18 19 21 26 28 29 29 32 29 26 24 25 25 23 24 26
WIND GUST 34
CLOUDS OV B1 SC SC SC FW FW SC SC SC SC FW SC SC SC B1 B1 B1
CLOUDS(%) 90 60 41 30 28 15 16 27 28 27 26 20 28 40 47 59 65 53
VSBY 5 9 10 10 10 10 10 10 10 10 10 10 10 10
POP 12HR 70 20 10 30 30
RAIN SHWRS SC IS SC SC SC SC SC SC SC SC
TSTMS IS IS IS
MIX HGT <1 1 2 4 4 2 1 1 <1 2 4 5 5 2
T WIND DIR S SW W W W W NW NW NW NW W W W W
T WIND SPD 2 6 24 29 31 16 14 13 12 37 36 32 32 32
DISPERSION FR GD GD GD GD GD GD GD GD
ADI 2 9 67106111 18 13 12 11 93129134136 43
MAX LVORI 6 5 3 1 1 3 3 4 4 3 1 1 1 1
STABILITY D D C C C D D D D C C C C D
CEILING 200 None None None None None None None
STA PRES 26.49 26.49 26.52 26.55 26.58 26.62 26.57
Date 05/23Sat 05/24/25Sun 05/25/25Mon 05/26/25Tue 05/27/25
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 53 42 59 48 62 54 63 54 61
TEMP 51 49 42 45 57 55 48 52 60 60 56 55 62 60 56 55 59 58
DEWPT 34 34 35 36 38 41 41 43 48 50 49 49 53 52 52 53 53 51
RH 52 56 76 70 49 59 77 71 64 69 77 80 72 75 86 93 80 77
WIND SPD 15> 15> <15 <15 <15 <15 <15 <15 <15
AVG CLOUDS SC FW SC SC SC B1 B1 B1 B1 B1 B2 B2 B1 B1 B2 B2 B2 B1
POP 12HR 10 5 10 30 50 50 60 60 60
RAIN SHWRS IS SC SC SC SC SC SC NM NM NM NM NM
TSTMS IS 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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