National Weather Service United States Department of Commerce

Heat Persists in the Southwest; Elevated to Critical Fire Weather in the Great Basin; Poor Air Quality in the West

Dangerous heat will persist across the Southwest U.S. through this week, easing by next week. The heat will focus further east in the Great Plains and Mississippi Valley beginning next week. Elevated to locally critical fire weather conditions will persist for the Great Basin today. Poor air quality lingers for the Northwest, Great Basin, Central Rockies into the Plains. Read More >

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EXPERIMENTAL...FIRE WEATHER POINT FORECAST MATRICES
NATIONAL WEATHER SERVICE Blacksburg VA
301 PM EDT Tue Aug 4 2026

VAZ012-050800-
RAWS 447502
37.01N  81.18W Elev. 2540 ft
301 PM EDT Tue Aug 4 2026

Date           08/04/26      Wed 08/05/26            Thu 08/06/26            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                 63          80          63          82          62
TEMP          77 71 67 67 66 66 73 77 79 74 67 66 65 65 76 81 78 72 67 65 63 65
DEWPT         69 67 66 65 65 66 70 69 70 68 66 65 64 65 69 69 70 68 66 65 63 65
MIN/MAX RH                  100          73         100          68         100
RH            76 87 97 93 97100 90 76 74 82 97 97 97100 79 67 76 87 97100100100
WIND DIR      SE SE SE SE  E SE SE  S SW  S  S  S  S SW SW SW SW SW SW SW SW SW
WIND SPD       2  2  1  1  1  1  1  2  2  1  1  1  1  1  2  2  2  1  1  1  1  1
CLOUDS        B1 B1 B2 B1 B2 B1 SC B2 B1 B1 FW SC B1 SC SC OV OV B1 B1 SC SC B1
CLOUDS(%)     68 64 80 63 81 59 41 73 68 53 22 48 59 40 40 91 91 52 53 40 49 60
VSBY           9 10  8  6  2  3 10 10 10 10  9 10 10                           
POP 12HR                     40          60          10          90          20
RAIN SHWRS    SC IS IS             NM SC             IS IS  O  O IS IS       SC
TSTMS         SC IS                SC SC                IS SC SC IS            
Obvis               PF PF PF PF                                                
MIX HGT        3 <1 <1 <1 <1 <1  2  4  3 <1 <1 <1 <1 <1  3  4  3 <1            
T WIND DIR     E  E SE SE SE  S  W  S  S  S  S  S SW SW SW  S SW  W            
T WIND SPD     8  9  8  4  3  5  4  5  9 11  6  8  6  6  5  6 12 10            
DISPERSION       VP VP VP VP             VP VP VP VP             VP VP VP VP   
ADI           34  4  4  2  2  6 15 26 30  5  3  4  3  7 23 32 41  5            
MAX LVORI      3  6  8  8 10  8  4  3  3  5  8  8  9  8  3  3  3  6            
STABILITY      B  F  F  F  F  B  A  B  B  F  G  F  F  A  A  B  B  F            
CEILING               400   100  None  1800  None  None  None  4500  None      
STA PRES            27.33 27.35 27.37 27.36 27.40 27.43 27.46 27.46            


Date           08/07Sat 08/08/26Sun 08/09/26Mon 08/10/26Tue 08/11/26
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       81      62      82      63      83      63      86      65      85
TEMP          80 75 65 64 78 73 67 64 79 75 67 65 82 77 69 67 81 76
DEWPT         69 68 64 64 69 68 65 64 68 67 64 65 68 68 66 67 69 68
RH            69 79 97100 74 84 93100 69 76 90100 63 74 90100 67 76
WIND SPD          <15     <15     <15     <15     <15     <15     <15     <15     <15
AVG CLOUDS    B1 B2 SC SC B1 B2 B1 B1 B1 B1 FW FW SC SC SC SC SC B1
POP 12HR           80      20      80      20      30      10      20      10      40
RAIN SHWRS    SC  O IS    SC  O IS       SC          IS          SC
TSTMS         IS SC IS    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