National Weather Service United States Department of Commerce

Print This Forecast (Printer-Friendly)

EXPERIMENTAL...FIRE WEATHER POINT FORECAST MATRICES
NATIONAL WEATHER SERVICE Blacksburg VA
801 PM EDT Thu May 21 2026

VAZ018-220800-
RAWS 444002
37.56N  80.18W Elev. 2702 ft
801 PM EDT Thu May 21 2026

Date           05/21/26      Fri 05/22/26            Sat 05/23/26            Sun
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          56          51          63          60
TEMP                60 60 58 55 56 56 56 54 53 52 52 51 54 61 63 62 61 61 60 63
DEWPT               58 56 55 54 56 56 56 54 53 52 52 51 54 58 60 59 58 58 57 59
MIN/MAX RH                  100          87         100          90          90
RH                  93 87 90 96100100100100100100100100100 90 90 90 90 90 90 87
WIND DIR             E  E  E  E  E  E  E  E  E  E  E  E SE SE SE  E SE  N  N  N
WIND SPD             3  3  3  3  4  4  4  4  4  3  3  3  3  3  2  2  1  0  0  0
WIND GUST           14 13 13 14 16 14 14 19 19 17 16 16 14                     
CLOUDS              OV OV OV OV OV OV OV OV OV OV OV OV OV OV OV OV OV B2 B2 B1
CLOUDS(%)           92 94 90 98 93 95 94 94 94 98 98 98 98 88 88 88 90 85 82 66
VSBY                 2  2  3  2  2  2  2  2  1  2  3  2  2  2  2  2  1  1  1  2
POP 12HR                     80          80         100         100          70
RAIN SHWRS          NM NM NM NM SC  O SC SC NM  O  O  O  O NM NM NM NM IS IS IS
TSTMS                              IS IS                   IS SC               
MIX HGT              1  1  1 <1  1  1  1 <1  1  1  1  1  1  1  1 <1            
T WIND DIR           E NE  E  E  E  E  E  E  E  E  E  E  E  E  E  E            
T WIND SPD           9  6  6  9 10  6 12 12 10  8 10  9  9  5  6  5            
DISPERSION          VP VP VP             VP VP VP VP             VP VP VP VP   
ADI                  4  3  3 11 14 10 18  8  7  4  5 13 14  9 11  3            
MAX LVORI            7  5  6  7  5  7  5  8  8  9  9  5  5  6  5  6            
STABILITY            F  F  F  B  C  C  C  E  E  F  F  B  B  B  B  F            
CEILING               100   100   100   100   200   100   200   100   100      
STA PRES            27.90 27.91 27.95 27.95 27.97 27.96 27.96 27.92            


Date           05/24Mon 05/25/26Tue 05/26/26Wed 05/27/26Thu 05/28/26
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       80      63      74      64      75      63      78      63      78
TEMP          79 73 66 66 73 69 66 67 74 71 66 67 77 73 67 66 77 72
DEWPT         68 66 62 63 69 66 62 63 69 66 62 62 67 65 61 60 64 62
RH            69 79 87 90 87 90 87 87 84 84 87 84 71 76 81 81 64 71
WIND SPD          <15     <15     <15     <15     <15     <15     <15     <15     <15
AVG CLOUDS    B1 B2 B1 B2 B2 OV B2 B2 OV OV B2 B2 B2 OV B2 B1 B1 B2
POP 12HR           80      50      90      60      90      50      80      40      60
RAIN SHWRS    IS  O SC SC NM  O NM SC  O  O SC SC NM  O SC SC SC NM
TSTMS            SC IS       SC IS       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