National Weather Service United States Department of Commerce

Print This Forecast (Printer-Friendly)

EXPERIMENTAL...FIRE WEATHER POINT FORECAST MATRICES
NATIONAL WEATHER SERVICE Blacksburg VA
400 AM EDT Wed May 20 2026

VAZ018-202000-
RAWS 444002
37.56N  80.18W Elev. 2702 ft
400 AM EDT Wed May 20 2026

Date             Wed 05/20/26            Thu 05/21/26            Fri 05/22/26
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                 92          65          76          54          62
TEMP          65 71 85 91 88 77 71 68 66 67 73 73 69 64 61 59 57 56 59 60 61 58
DEWPT         56 60 63 59 61 63 63 62 61 63 66 66 64 59 57 54 54 54 58 58 59 56
MAX/MIN RH                   35          87          74          94          86
RH            73 68 48 34 40 62 76 81 84 87 79 79 84 84 87 83 90 93 96 93 93 93
WIND DIR       W  W  W  W  W NW NW  N  N  E  E  E  E  E  E  E  E  E  E  E  E  E
WIND SPD       6  4  4  4  3  3  2  0  0  1  2  3  3  4  4  3  3  4  4  4  4  4
WIND GUST           14       13                      17 17 14 13 16 16 14 14 18
CLOUDS        CL CL CL SC B1 B2 B2 B2 B2 B2 OV OV OV OV OV OV OV B2 B2 B2 OV OV
CLOUDS(%)      3  5  2 29 53 76 72 79 73 86 90 90 93 97 97 94 94 86 86 87 88 90
VSBY          10 10 10 10 10 10  9  4  3  4  6  7  3  1  1  1  3  3 10 10 10 10
POP 12HR                     30          70         100         100          80
RAIN SHWRS                SC NM SC SC SC SC  O NM  O  O  O  O  O  O  O SC SC  O
TSTMS                     SC SC IS IS       IS SC SC                   IS IS   
MIX HGT       <1 <1  5  7  6 <1 <1 <1 <1 <1  1  2  1 <1  1  1  1  1  1  1  1  1
T WIND DIR     W  W  W SW SW NW  N NE  E  E NE NE NE  E  E  E  E  E  E  E  E  E
T WIND SPD     5  4 13 11  8  2  2  5 10  8 13 16 11  8 10 10  9 11 10 10  9  8
DISPERSION    PR             VP VP VP VP             VP VP VP VP             VP
ADI            3  4 83100 51  1  1  3  5 10 25 33 18  5  7  5  4 17 17 19 16  5
MAX LVORI      3  3  1  1  1  3  4  5  5  4  3  3  4  5  4  5  5  5  5  5  5  6
STABILITY      F  A  A  A  B  F  F  F  F  B  B  B  B  E  E  F  F  C  C  C  C  E
CEILING              None  None  3500     0   100   400   100   100   200   200
STA PRES            27.88 27.80 27.83 27.84 27.90 27.94 27.97 27.96 27.99 27.98


Date          Sat 05/23/26Sun 05/24/26Mon 05/25/26Tue 05/26/26
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       56      71      61      78      64      80      65      81
TEMP          58 58 68 67 64 63 76 72 66 66 78 73 67 67 80 74
DEWPT         54 55 63 62 58 60 66 65 60 62 68 66 61 63 67 65
RH            86 90 84 84 81 90 71 79 81 87 71 79 81 87 65 74
WIND SPD          <15     <15     <15     <15     <15     <15     <15     <15
AVG CLOUDS    OV B2 OV B2 B2 B2 B1 B2 B1 B2 B2 OV B1 B1 B2 B2
POP 12HR           80      90      50      70      40      80      30      80
RAIN SHWRS     O NM  O NM SC IS SC NM SC IS SC  O SC IS NM  O
TSTMS                  SC IS       SC IS       SC IS       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