National Weather Service United States Department of Commerce

Print This Forecast (Printer-Friendly)

EXPERIMENTAL...FIRE WEATHER POINT FORECAST MATRICES
NATIONAL WEATHER SERVICE Blacksburg VA
310 PM EST Wed Feb 21 2018

NCZ018-220900-
RAWS 311941
36.22N  81.63W Elev. 3254 ft
310 PM EST Wed Feb 21 2018

Date           02/21/18      Thu 02/22/18            Fri 02/23/18            Sat
UTC 3hrly     21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12
EST 3hrly     16 19 22 01 04 07 10 13 16 19 22 01 04 07 10 13 16 19 22 01 04 07

MIN/MAX TEMP                 58          65          54          64          55
TEMP          67 64 62 61 60 58 59 64 63 63 60 56 54 56 58 60 64 60 57 56 55 55
DEWPT         59 58 58 57 57 58 57 59 58 57 56 56 54 54 55 55 54 53 53 53 52 52
MIN/MAX RH                  100          75         100          69          92
RH            75 81 87 87 90100 93 84 84 81 87100100 93 90 84 70 78 86 90 90 90
WIND DIR       S  S  S  S  S  S  S SW  S SW SW  S SW  S  S  S SW SW SW SW SW SW
WIND SPD       6  4  4  5  6  8  8  5  4  3  2  2  4  2  6  8  9  5  4  5  5  5
CLOUDS        B1 B1 B2 B1 B1 B1 B1 B2 B2 B1 B2 B2 B1 B1 B2 B1 B1 B1 B1 B1 B2 B2
CLOUDS(%)     64 61 72 67 60 58 67 78 82 66 85 79 65 59 72 59 52 56 60 66 71 81
VSBY           7  7  7  7  7  7  7  7  7  7  7  7  7  7  7  7  7  7            
POP 12HR                     40          20          20          20          20
RAIN SHWRS    SC SC SC SC SC          IS IS IS IS IS       IS IS IS IS       IS
LAL            2  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1               
HAINES         3  3  3  2  2  2  3  3  2  3  3  2  2  2  2  2  2  2            
MIX HGT        2  2  1 <1 <1 <1  2  2  3  2  1 <1 <1 <1  2  2  2  2            
T WIND DIR    SW SW SW SW  S  S SW  W  W SW  S  S SW  S  S  S SW SW            
T WIND SPD    21 21 21 17  6 10 18 16 10  8 13  3  5 17 21 21 17 16            
DISPERSION       VP VP PR PR             VP VP VP VP             PR VP PR PR   
ADI           43 13 12 10  7 38 55 47 36  5  5  3  5 11 38 43 47 10            
MAX LVORI      1  4  4  5  9  6  4  3  3  4  5 10  9  5  4  3  3  4            
STABILITY      D  E  E  E  E  D  D  D  C  F  F  F  E  C  D  D  D  E            
CEILING               500   400   500   500   500   400   400  None   600      
STA PRES            27.37 27.35 27.37 27.34 27.37 27.34 27.33 27.24            


Date           02/24 Sun 02/25/18 Mon 02/26/18 Tue 02/27/18 Wed 02/28/18
UTC 6hrly     18 00 06 12 18 00 06 12 18 00 06 12 18 00 06 12 18 00
EST 6hrly     13 19 01 07 13 19 01 07 13 19 01 07 13 19 01 07 13 19

MAX/MIN TEMP       66      54      64      44      57      40      55      37      50
TEMP          63 61 58 59 62 55 49 47 54 49 45 44 54 46 40 39 48 MM
DEWPT         54 53 54 54 50 46 43 41 40 36 37 34 35 33 32 31 35 MM
RH            72 75 86 83 65 72 80 79 59 61 73 68 48 60 73 73 60 MM
WIND SPD          <15     <15     15>     <15     <15     <15     <15     <15     <15
AVG CLOUDS    B2 B2 OV OV B2 B2 B1 B2 B1 B1 SC SC SC SC FW FW SC SC
POP 12HR           20      40      60      30      10      10       5       5       0
RAIN SHWRS    IS IS SC SC SC NM SC 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