National Weather Service United States Department of Commerce

Heat Builds in the West; Extremely Critical Fire Weather in the Northwest

A heat wave over the Southwest will intensify this week, peaking and expanding into the Intermountain West and northern High Plains this weekend. Critical to extremely critical fire weather conditions are forecast from the Northwest and the northern Great Basin this weekend. Particularly Dangerous Situation Red Flag Warnings have been issued. Read More >

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EXPERIMENTAL...FIRE WEATHER POINT FORECAST MATRICES
NATIONAL WEATHER SERVICE Blacksburg VA
801 AM EDT Sun Aug 2 2026

VAZ024-022000-
RAWS 441631
37.63N  79.51W Elev. 865 ft
801 AM EDT Sun Aug 2 2026

Date             Sun 08/02/26            Mon 08/03/26            Tue 08/04/26
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                 84          68          87          67          85
TEMP                75 80 82 78 72 71 70 71 81 87 85 78 72 69 67 69 78 84 84 77
DEWPT               73 74 75 73 72 71 70 71 73 72 73 72 70 69 67 69 71 70 71 71
MAX/MIN RH                   80         100          61         100          63
RH                  94 82 79 85100100100100 77 61 67 82 93100100100 79 63 65 82
WIND DIR            SE  S SE SE SE SE  N  N SW SW  S  S NE  N NE NE  E SE SE SE
WIND SPD             2  4  4  2  1  1  0  0  1  3  3  1  1  0  1  1  1  3  3  1
CLOUDS              OV B2 B2 B2 B2 B1 B2 B1 B1 B1 B1 B1 B1 B1 B2 B2 B2 B2 B2 B1
CLOUDS(%)           93 86 87 79 78 68 74 56 51 54 63 68 59 65 71 70 77 76 76 60
VSBY                 0  7  9  5  3  0  0  0 10 10 10  7  7  7  7  7  7  7  7  7
POP 12HR                     90          70          60          50          60
RAIN SHWRS           O  O  O NM SC             SC SC SC SC IS IS SC SC NM NM SC
TSTMS                O NM NM SC SC             SC SC SC             IS SC SC IS
Obvis                           PF PF PF PF                                    
MIX HGT              1  2  2 <1 <1 <1 <1 <1  2  4  3 <1 <1 <1 <1 <1  2  3  3 <1
T WIND DIR          SE  S  S SE  S  S  S SW SW SW  S  S  S  S SE  S  S  S  S  S
T WIND SPD           8 16 16  9  9  6  6  8  6  6  9 12  9  6  6  8 10 11 12 12
DISPERSION                   VP VP VP VP             VP VP VP VP             VP
ADI                 14 41 37  4  4  3  3  9 22 35 37  6  4  3  3  8 27 43 41  6
MAX LVORI            5  3  3  5  9  9  9  8  3  1  3  4  6  9  9  8  3  1  1  4
STABILITY            B  C  C  F  F  F  F  B  B  B  B  F  F  F  F  B  B  B  B  F
CEILING               100  2800  1400  None  None  3200  3600  3600  3200  4700
STA PRES            28.32 28.30 28.31 28.33 28.38 28.38 28.44 28.47 28.50 28.49


Date          Wed 08/05/26Thu 08/06/26Fri 08/07/26Sat 08/08/26
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      87      68      89      68      89      68      90
TEMP          69 70 85 80 71 70 87 81 72 71 87 81 71 70 88 80
DEWPT         69 69 72 72 70 70 72 73 70 70 72 73 71 70 72 73
RH           100 97 65 77 97100 61 77 93 97 61 77100100 59 79
WIND SPD          <15     <15     <15     <15     <15     <15     <15     <15
AVG CLOUDS    B1 B1 B1 B2 SC SC B1 B1 SC SC SC B2 SC SC SC B1
POP 12HR           40      60      20      50      20      60      20      50
RAIN SHWRS    SC IS IS NM IS    IS SC IS       NM IS       SC
TSTMS         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