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 >

Print This Forecast (Printer-Friendly)

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

VAZ046-030800-
RAWS 441101
37.39N  78.80W Elev. 804 ft
131 AM EDT Sun Aug 2 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                 69          83          69          85          68
TEMP                   73 71 71 75 81 80 76 73 72 71 72 78 84 83 77 72 70 69 70
DEWPT                  68 69 71 75 77 76 75 73 72 71 72 76 76 75 75 72 70 69 70
MIN/MAX RH                  100          84         100          74         100
RH                     84 93100100 88 88 97100100100100 94 77 77 94100100100100
WIND DIR                S SE SE SE  S  S  S  S  S  S SW SW SW SW  S  S NE NE NE
WIND SPD                6  5  5  6  8  8  5  5  5  5  5  5  6  6  3  2  2  3  4
WIND GUST              17                                                      
CLOUDS                 B2 B2 B2 B2 OV B2 B2 B2 B2 B2 B1 B2 SC B1 B1 B1 B1 B2 B2
CLOUDS(%)              79 83 82 85 88 77 86 86 82 83 69 71 45 63 61 61 63 76 71
VSBY                    7  7  6  6  3  6  3  3  7 10 10 10  7  7  6  6  7  7  6
POP 12HR                     40          80          80          50          40
RAIN SHWRS             IS SC SC NM  O NM  O  O SC          IS SC SC SC IS IS SC
TSTMS                     IS IS SC SC SC SC SC IS          IS SC SC            
MIX HGT                <1 <1  1  2  2  3 <1 <1 <1 <1 <1  2  4  4 <1            
T WIND DIR              S  S SE  S  S  S  S  S  S  S  S SW SW  S  S            
T WIND SPD             14 13 11 11 10 12 12 11 12 11 11 18 13 14 17            
DISPERSION             PR PR             PR PR PR PR             VP VP VP VP   
ADI                    10  9 18 26 28 39  8  8  8  8 13 47 52 55 12            
MAX LVORI               4  6  5  4  4  4  8  8  8  8  5  4  3  3  6            
STABILITY               E  E  C  C  C  C  E  E  E  E  C  C  C  C  E            
CEILING                    1300   700  4300   900   500  1100  3800  3400      
STA PRES                  29.14 29.13 29.09 29.11 29.12 29.16 29.15            


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       82      68      85      69      87      70      87      69      88
TEMP          81 76 70 70 83 79 71 71 86 78 72 72 86 78 71 71 87 78
DEWPT         73 73 70 70 75 74 71 71 76 75 72 72 75 75 71 71 75 74
RH            77 90100100 77 85100100 72 91100100 70 91100100 68 88
WIND SPD          <15     <15     <15     <15     <15     <15     <15     <15     <15
AVG CLOUDS    B2 B2 B1 B1 B1 B1 SC SC SC B1 SC SC SC B1 B1 SC SC B1
POP 12HR           60      40      50      10      30      10      40      30      40
RAIN SHWRS    SC NM SC IS    SC          SC          SC SC       SC
TSTMS         IS SC IS       SC          SC          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