National Weather Service United States Department of Commerce

Print This Forecast (Printer-Friendly)

EXPERIMENTAL...FIRE WEATHER POINT FORECAST MATRICES
NATIONAL WEATHER SERVICE Blacksburg VA
231 AM EDT Sat Apr 18 2026

VAZ018-190800-
RAWS 444002
37.56N  80.18W Elev. 2702 ft
231 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                 58          87          46          60          41
TEMP                      59 60 77 85 86 75 70 63 51 47 51 57 59 51 47 45 42 42
DEWPT                     45 47 51 50 52 54 56 56 45 37 33 26 23 21 22 26 28 28
MIN/MAX RH                   63          30          79          24          60
RH                        60 62 40 30 31 48 61 78 80 68 50 30 25 30 37 47 57 57
WIND DIR                  SW SW  S SW SW  W  W NW NW NW NW NW NW NW  W  W NW NW
WIND SPD                   1  1  3  6  6  4  4  6 14 18 14 12 11  8  5  5  6  8
WIND GUST                       14 19 19 17 18 21 37 44 40 34 32 27 20 20 23 25
CLOUDS                    SC SC SC SC B1 B2 B2 B2 OV B2 B1 SC FW CL CL FW SC FW
CLOUDS(%)                 38 30 50 46 55 77 83 80 89 87 67 42  8  4  4 11 28 25
VSBY                      10 10 10 10 10 10  8  9 10 10  9  9  9  9 10  9  9   
POP 12HR                      0          20          80          30          10
RAIN SHWRS                               SC NM NM SC SC SC                     
TSTMS                                    SC IS                                 
MIX HGT                   <1 <1  3  7  8 <1 <1  1  2  2  4  6  6  2            
T WIND DIR                NW  N SW SW SW SW  W  W NW NW NW NW NW NW            
T WIND SPD                 1  0 17 16 18  9 16 18 27 31 33 28 31 24            
DISPERSION                VP             VP VP PR GD             PR PR PR PR   
ADI                        1  0 70119 90  6 11 12 31 63 91126139 16            
MAX LVORI                  3  3  1  1  1  2  2  4  4  1  1  1  1  2            
STABILITY                  G  A  A  B  C  E  E  E  D  D  D  C  C  E            
CEILING                    None  None  8300  4000  1600  3100  None  None      
STA PRES                  27.76 27.74 27.65 27.63 27.68 27.79 27.81            


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       56      33      70      48      77      53      80      55      83
TEMP          55 48 35 37 66 60 50 53 75 68 56 55 77 70 57 57 81 72
DEWPT         23 18 19 21 26 32 34 38 43 43 45 47 48 46 46 47 47 46
RH            29 30 52 52 22 35 54 57 32 40 66 74 36 42 67 69 30 39
WIND SPD          <15     <15     <15     <15     <15     <15     <15     <15     <15
AVG CLOUDS    FW FW CL CL FW FW FW FW SC SC FW FW FW FW FW FW FW SC
POP 12HR            0       0       0       5      20       5      10       5      10
RAIN SHWRS                            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