National Weather Service United States Department of Commerce

Print This Forecast (Printer-Friendly)

EXPERIMENTAL...FIRE WEATHER POINT FORECAST MATRICES
NATIONAL WEATHER SERVICE Blacksburg VA
403 AM EST Tue Dec 12 2017

NCZ018-122100-
RAWS 311941
36.22N  81.63W Elev. 3254 ft
403 AM EST Tue Dec 12 2017

Date             Tue 12/12/17            Wed 12/13/17            Thu 12/14/17
UTC 3hrly     09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00
EST 3hrly     04 07 10 13 16 19 22 01 04 07 10 13 16 19 22 01 04 07 10 13 16 19

MAX/MIN TEMP                 35          12          30          22          38
TEMP             34 33 30 26 23 20 18 17 13 22 27 29 27 25 25 24 22 31 36 37 34
DEWPT            29 26 22 16 11  7  5  5  5  4  4  7 11 13 17 18 20 23 25 25 26
MAX/MIN RH                   58          72          35          90          61
RH               82 75 72 65 59 56 56 58 70 45 37 39 50 60 71 77 92 72 64 61 72
WIND DIR          W NW NW NW NW NW NW NW NW  W  W SW SW  W  W  W  W NW NW NW NW
WIND SPD         17 20 25 23 25 26 25 20 17 13 10  9  9 13 17 20 21 19 12  9  4
WIND GUST        29    46 47 42 41 43 36 28                27 31 34 29         
CLOUDS           B2 B1 B1 B1 SC SC FW FW FW CL CL FW B1 SC SC B1 B1 SC SC SC SC
CLOUDS(%)        79 62 54 54 42 40 24 12  8  4  3 20 51 39 37 51 54 50 48 45 49
VSBY              7  5  5  5  5  5  7  7  7  7  7  7  7  7  7  7  7  7  7  7  7
POP 12HR                     40          30           5          20          10
FLURRIES                           SC                                          
SNOWSHWRS           SC SC SC SC IS                            IS               
LAL               1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1   
HAINES            2  2  2  2  2  2  2  2  2  3  3  3  3  4  2  2  2  2  2  2  3
MIX HGT          <1  2  3  3  4  3  2  2  1  2  2 <1 <1 <1 <1 <1 <1  2  2  2  2
T WIND DIR        W NW NW NW NW NW NW NW NW NW  W SW SW  W  W  W NW NW NW NW  W
T WIND SPD       17 44 43 47 47 49 50 49 39 29 18  9  9 13 17 20 42 43 21 14  8
DISPERSION                   GD GD GD GD             PR FR GD GD             VP
ADI              19 87 96108 63 67 68 66 57 52 39  7  8 13 16 18 47 90 46 41  6
MAX LVORI         5  3  3  1  1  1  1  1  3  1  1  2  2  2  3  3  4  3  1  1  3
STABILITY         D  D  D  D  D  D  D  D  D  D  C  C  D  D  D  D  D  D  D  C  E
CEILING              4400  None  None  None  None  None  None  None  None  None
STA PRES            26.65 26.65 26.67 26.71 26.78 26.71 26.64 26.60 26.72 26.80


Date          Fri 12/15/17 Sat 12/16/17 Sun 12/17/17 Mon 12/18/17
UTC 6hrly     06 12 18 00 06 12 18 00 06 12 18 00 06 12 18 00
EST 6hrly     01 07 13 19 01 07 13 19 01 07 13 19 01 07 13 19

MIN/MAX TEMP       28      33      24      41      35      47      36      44
TEMP          31 28 32 29 27 25 41 37 36 36 47 39 38 36 44 39
DEWPT         26 25 23 20 17 16 21 23 22 25 33 34 35 31 30 30
RH            81 88 69 69 65 68 44 56 56 64 58 82 89 82 57 70
WIND SPD          <15     <15     <15     <15     <15     <15     <15     <15
AVG CLOUDS    B1 B2 B2 B1 SC SC FW FW FW SC B1 B1 B1 B1 SC SC
POP 12HR           10      20      20       0      10      20      40      20
FLURRIES                     SC                              
RAIN SHWRS                                     IS SC SC IS   
SNOW                 S  S                                    
SNOWSHWRS              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
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