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
801 AM EDT Tue Aug 4 2026

NCZ003-042000-
RAWS 310302
36.35N  80.48W Elev. 1076 ft
801 AM EDT Tue Aug 4 2026

Date             Tue 08/04/26            Wed 08/05/26            Thu 08/06/26
UTC 3hrly     09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00
EDT 3hrly     05 08 11 14 17 20 23 02 05 08 11 14 17 20 23 02 05 08 11 14 17 20

MAX/MIN TEMP                 79          68          81          68          83
TEMP                73 76 76 72 70 70 69 70 74 79 79 75 71 70 69 70 77 82 80 76
DEWPT               70 72 72 71 70 70 69 70 73 74 73 72 71 70 69 70 73 74 73 72
MAX/MIN RH                   85         100          81         100          76
RH                  90 87 87 97100100100100 97 85 82 90100100100100 87 77 79 87
WIND DIR            NE  E NE  E  E NE NE  E  S  S  S  S  S  S SW  S SW  S  S SW
WIND SPD             6  5  4  4  3  3  2  2  3  4  4  2  2  2  3  3  5  6  6  4
CLOUDS              B2 B2 B2 B2 B2 B1 B1 B2 B1 B1 B2 B1 B1 B1 B1 B1 SC B2 B2 B1
CLOUDS(%)           72 74 76 81 77 64 57 74 69 62 71 67 67 64 68 59 46 80 80 51
VSBY                10  6  6  6  6  7  4  4 10 10 10  4  4 10 10               
POP 12HR                     60          50          60          50          70
RAIN SHWRS          IS SC NM SC SC IS          SC NM SC SC             NM NM IS
TSTMS               IS SC NM SC                SC SC IS                SC SC IS
MIX HGT              2  3  2 <1 <1 <1 <1 <1  2  3  3 <1 <1 <1 <1 <1  2  4  2 <1
T WIND DIR          NE NE  E  E  E  E NW  W  S SW  S  S  S  S  S  S SW SW SW SW
T WIND SPD          10  8  8  3  3  2  2  2  4 10 12 12 10  8  8  8  9 11 12 10
DISPERSION                   VP VP VP VP             VP VP VP VP             VP
ADI                 26 24 20  2  2  1  1  2 12 34 36  6  5  4  4  8 26 43 25  7
MAX LVORI            4  4  4  8 10 10 10  9  5  4  4  6  9  9  9  8  4  3  3  5
STABILITY            C  C  C  E  F  F  F  B  B  C  C  F  F  F  F  B  A  C  C  E
CEILING               500  5900   800   500  3500  2100  2100   600  None  3900
STA PRES            28.97 28.95 28.98 29.00 29.03 29.01 29.05 29.08 29.13 29.12


Date          Fri 08/07/26Sat 08/08/26Sun 08/09/26Mon 08/10/26
UTC 6hrly     06 12 18 00 06 12 18 00 06 12 18 00 06 12 18 00
EDT 6hrly     02 08 14 20 02 08 14 20 02 08 14 20 02 08 14 20

MIN/MAX TEMP       68      83      68      84      68      85      68      86
TEMP          70 70 82 77 70 70 82 78 70 70 83 79 70 70 84 80
DEWPT         70 70 74 72 70 70 73 72 70 70 73 72 70 70 72 72
RH           100100 77 85100100 74 82100100 72 79100100 67 77
WIND SPD          <15     <15     <15     <15     <15     <15     <15     <15
AVG CLOUDS    B1 B1 B1 B1 B1 SC SC B1 SC SC SC B1 SC SC SC SC
POP 12HR           20      50      20      50      20      30      10      20
RAIN SHWRS    IS       SC IS       SC IS       SC          IS
TSTMS         IS       SC IS       SC IS       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

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