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 310301
36.48N  80.86W Elev. 1300 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          67          81          67          83
TEMP                75 78 75 73 70 70 69 69 74 78 78 75 71 69 68 70 78 82 79 76
DEWPT               72 73 74 72 70 70 69 69 74 74 75 74 71 69 68 70 74 74 75 73
MAX/MIN RH                   85         100          85         100          78
RH                  90 85 97 97100100100100100 88 91 97100100100100 88 77 88 90
WIND DIR             E  E  E  E  N  N  N  N SE  S  S  S  N  N  N  N  S  S  S SW
WIND SPD             4  4  3  1  0  0  0  0  2  4  4  1  0  0  0  0  3  6  5  1
CLOUDS              B2 B1 B2 B2 B2 B2 B1 B2 B1 B2 B2 B1 B1 B1 B1 B1 SC OV OV SC
CLOUDS(%)           82 69 73 83 78 82 58 72 58 73 71 57 58 68 69 62 46 89 89 48
VSBY                10  6  6  6  6  6  3  3 10 10 10  7  7 10 10               
POP 12HR                     50          50          70          40          80
RAIN SHWRS             SC SC SC SC IS    IS    NM NM SC SC              O  O IS
TSTMS                  SC SC 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  3  2 <1
T WIND DIR           E  E  E SE SE SE SW SW  S  S  S  S  S  S  S  S SW SW  S SW
T WIND SPD           8  8  9  5  1  2  2  2  5 10 12 12 11  8  6  9  6  9 11  9
DISPERSION                   VP VP VP VP             VP VP VP VP             VP
ADI                 22 29 25  3  1  1  1  3 12 32 38  6  5  4  3 10 18 30 26  4
MAX LVORI            4  4  5  8 10 10 10  9  5  4  4  7  9  9  9  8  4  3  4  6
STABILITY            C  B  B  F  F  F  F  B  B  C  C  F  F  F  F  B  A  C  C  F
CEILING              1000  9300  1600   600  1100  2900  2200   900  None  1900
STA PRES            28.15 28.14 28.17 28.18 28.21 28.20 28.23 28.26 28.30 28.30


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       67      84      66      84      66      85      67      87
TEMP          69 70 82 77 69 69 82 78 68 69 83 79 69 70 84 80
DEWPT         69 70 74 74 69 69 74 74 68 69 73 74 69 69 73 74
RH           100100 77 90100100 77 88100100 72 85100 97 70 82
WIND SPD          <15     <15     <15     <15     <15     <15     <15     <15
AVG CLOUDS    B1 SC B1 B2 B1 SC SC B2 SC SC SC B1 SC SC SC B1
POP 12HR           20      60      20      70      20      50      20      30
RAIN SHWRS    IS    IS NM IS       NM IS       SC IS       SC
TSTMS         IS    IS SC 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