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
931 PM EDT Sat Aug 1 2026

VAZ018-020800-
RAWS 444002
37.56N  80.18W Elev. 2702 ft
931 PM EDT Sat Aug 1 2026

Date           08/01/26      Sun 08/02/26            Mon 08/03/26            Tue
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                 67          78          68          82          67
TEMP                71 70 69 68 71 76 77 72 70 70 69 69 76 81 79 72 70 68 67 68
DEWPT               68 66 66 67 69 70 71 70 70 69 68 69 72 72 73 71 68 67 67 68
MIN/MAX RH                   95          83         100          75         100
RH                  90 87 90 97 93 82 82 93100 97 97100 87 74 82 97 93 97100100
WIND DIR            SE SE SE SE  S SE SE  S SE SW SW SW  S  S  S  S SW  N NW SE
WIND SPD             9  8  6  5  6  6  5  3  2  1  1  1  2  3  3  2  1  0  1  1
WIND GUST           23 23 18 17       16 13                                    
CLOUDS              OV OV OV OV OV OV B2 OV B2 B2 B1 SC B1 B2 B2 B1 B1 B1 B1 B1
CLOUDS(%)           89 97 94 93 96 96 70 89 78 74 67 49 56 84 84 66 52 61 63 65
VSBY                 7  6  5  3  4  7 10  8  4  5  4  7  7  7  7  7  7  7  7  7
POP 12HR                     50         100          80          80          30
RAIN SHWRS          SC SC SC NM SC NM  O  O NM       IS IS  O  O SC SC       SC
TSTMS                           IS SC NM SC IS          IS SC SC IS            
MIX HGT             <1 <1 <1 <1  1  2  2 <1 <1 <1 <1 <1  3  4  3 <1            
T WIND DIR          SE SE SE SE  S  S  S  S  S  S SW SW SW SW SW SW            
T WIND SPD          13 12  9 12 13 17 19 14 11 10  8  8 13 10  5  4            
DISPERSION          PR PR PR             VP VP VP VP             VP VP VP VP   
ADI                  9  8  6 10 22 45 48  7  5  5  4  9 47 52 23  2            
MAX LVORI            5  5  6  8  5  4  4  6  9  7  8  8  4  3  3  9            
STABILITY            E  E  E  C  C  C  C  F  F  F  F  A  B  B  B  F            
CEILING                     600   600  1800   500   600  None  3000  3100      
STA PRES                  27.62 27.62 27.58 27.61 27.63 27.68 27.69            


Date           08/04Wed 08/05/26Thu 08/06/26Fri 08/07/26Sat 08/08/26
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       80      67      81      67      83      68      85      68      86
TEMP          80 73 69 69 80 74 69 69 82 75 69 70 83 75 70 70 84 76
DEWPT         72 71 67 68 72 71 68 68 72 71 67 68 72 71 67 68 72 71
RH            77 93 93 97 77 90 97 97 72 87 93 93 70 87 90 93 67 85
WIND SPD          <15     <15     <15     <15     <15     <15     <15     <15     <15
AVG CLOUDS    B1 B2 B1 B1 B1 B2 SC SC SC B1 SC SC SC B1 SC SC SC B1
POP 12HR           80      20      70      20      50      20      50      20      40
RAIN SHWRS    SC  O IS    SC NM IS    IS SC IS       SC IS       SC
TSTMS         IS SC 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