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 Wed May 21 2025

VAZ020-220800-
RAWS 441801
37.99N  79.76W Elev. 2160 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                 57          70          55          67          49
TEMP                      58 59 63 68 69 62 58 56 55 56 64 67 64 56 53 51 49 51
DEWPT                     55 55 57 58 55 52 50 48 46 47 45 44 42 42 42 41 40 41
MIN/MAX RH                   94          63          74          43          73
RH                        90 87 81 70 61 70 75 74 72 72 50 43 45 59 66 68 71 68
WIND DIR                  SE SE SE  S  W  W  W  W  W  W  W  W  W  W  W  W  W  W
WIND SPD                   2  3  3  3  4  3  3  4  4  5  5  6  5  4  4  4  4  5
WIND GUST                                         14 18 19 19 18 17 14 14 16 17
CLOUDS                    OV OV OV B2 B2 SC SC SC SC SC SC SC SC SC SC SC SC SC
CLOUDS(%)                 99 90 88 77 73 26 33 32 38 33 44 50 48 42 44 49 50 43
VSBY                       2  3  4  7  7  9  3 10  7 10 10 10 10 10            
POP 12HR                     90          60          30          40          30
RAIN SHWRS                EC NM NM SC SC SC SC SC SC SC SC SC SC SC SC IS IS   
TSTMS                     IS          IS IS IS             IS IS               
Obvis                     PF                                                   
MIX HGT                   <1 <1  1  3  3  1 <1  1  2  3  5  6  5  2            
T WIND DIR                SE SE SE  W SW  W  W  W  W  W  W  W  W NW            
T WIND SPD                 5  8  5  2  9 16 19 25  9 31 41 33 27  8            
DISPERSION                VP             VP VP VP VP             VP VP VP VP   
ADI                        3  8  8  8 31  7  9 11  4126200200187  5            
MAX LVORI                  6  5  4  3  1  3  3  3  3  3  1  1  1  3            
STABILITY                  F  B  B  B  C  G  G  F  F  A  A  B  A  E            
CEILING                     300   300   300  None  None  None  None  None      
STA PRES                  27.63 27.59 27.58 27.63 27.63 27.66 27.63            


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       62      47      67      47      65      54      70      57      68
TEMP          62 54 49 50 67 58 48 51 64 61 56 57 70 63 58 59 68 62
DEWPT         36 35 36 38 37 38 38 42 45 47 47 49 51 51 51 53 53 51
RH            38 48 61 63 33 47 68 71 50 60 72 75 51 65 77 80 59 67
WIND SPD          <15     <15     <15     <15     <15     <15     <15     <15     <15
AVG CLOUDS    SC SC FW SC FW SC SC SC B1 B1 B2 B2 B1 B1 B2 B2 B2 B1
POP 12HR           10       5       5      10      40      40      50      60      60
RAIN SHWRS                            SC SC SC SC SC SC NM NM SC 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