National Weather Service United States Department of Commerce

Print This Forecast (Printer-Friendly)

EXPERIMENTAL...FIRE WEATHER POINT FORECAST MATRICES
NATIONAL WEATHER SERVICE Blacksburg VA
316 PM EDT Tue Apr 24 2018

NCZ003-250900-
RAWS 310301
36.48N  80.86W Elev. 1300 ft
316 PM EDT Tue Apr 24 2018

Date           04/24/18      Wed 04/25/18            Thu 04/26/18            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                 51          67          48          67          49
TEMP          58 56 53 52 52 53 57 62 66 61 56 53 51 52 59 63 66 61 57 54 52 52
DEWPT         53 52 52 51 51 51 52 53 50 48 46 45 43 44 44 45 47 47 48 46 45 46
MIN/MAX RH                   98          56          82          50          87
RH            83 86 96 96 96 93 83 72 56 62 69 74 74 74 57 52 50 60 72 74 77 80
WIND DIR       E NE NE  N NW NW NW NW NW NW NW NW NW  N  E  S  S NE  E SE  S NW
WIND SPD       8  5  5  3  3  5  8 11 11  9  8  5  5  4  2  4  3  2  5  5  4  5
CLOUDS        OV OV OV OV OV OV OV B2 B1 SC SC B1 B1 B1 B1 B2 B2 OV OV B2 B2 B1
CLOUDS(%)     99 97 95 94 95 95 92 84 67 47 46 58 61 66 66 77 83 90 90 79 78 66
VSBY           6  6  6  6  2  7  7  7  7                                       
POP 12HR                     80          40          10          60          60
RAIN           D  D  L                                                         
RAIN SHWRS             NM SC SC SC SC IS                   SC NM NM NM SC SC   
Obvis               PF PF PF                                                   
LAL            1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1               
HAINES         3  3  3  3  3  3  3  3  3  2  2  2  3  2  2  3  3  3            
MIX HGT        2  1  1  1 <1  1  2  3  5  4  3  2  2  2  4  4  5  4            
T WIND DIR     E  E NE NE  N NW NW NW NW NW NW NW  N  N SE  S  S SE            
T WIND SPD    12 12 11  8  3  9 13 17 23 24 24 19 13 10  5  6  5  8            
DISPERSION       PR PR VP VP             PR PR PR PR             VP PR PR VP   
ADI           24  8  8  3  2 12 28 45 70 33 32 13 10 18 19 18 27  4            
MAX LVORI      4  5  6  6  8  5  3  3  1  1  3  3  3  3  2  2  2  3            
STABILITY      D  E  E  F  F  D  D  D  D  D  D  E  E  D  C  D  C  F            
CEILING               300  1200  1200  3100  None  7000  3300  2600  2600      
STA PRES            27.91 27.88 27.92 27.94 27.98 27.97 28.02 27.97            


Date           04/27 Sat 04/28/18 Sun 04/29/18 Mon 04/30/18 Tue 05/01/18
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       68      47      69      46      70      44      72      49      77
TEMP          65 61 53 51 65 61 52 50 65 61 51 49 67 65 55 56 72 69
DEWPT         46 46 43 44 44 42 37 40 40 41 37 40 46 49 45 47 50 52
RH            50 58 69 77 46 49 56 68 40 48 59 71 47 56 69 72 46 55
WIND SPD          <15     <15     <15     <15     <15     <15     <15     <15     <15
AVG CLOUDS    B1 B1 B1 SC SC SC FW FW FW FW FW FW FW FW FW FW FW FW
POP 12HR           20       5       5       5       0       5      10      10      10
RAIN SHWRS       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
LAL(CATEGORY).......................Lightning Activity Level
HAINES(CATEGORY)....................Haines Index
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