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
1201 AM EDT Sun Aug 2 2026

VAZ012-030800-
RAWS 447502
37.01N  81.18W Elev. 2540 ft
1201 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                 65          81          63          80          62
TEMP                   67 66 66 72 76 79 73 67 66 64 65 73 76 79 72 66 64 62 64
DEWPT                  65 66 66 71 70 71 69 66 65 64 65 69 68 68 67 65 63 62 64
MIN/MAX RH                  100          77         100          69         100
RH                     93100100 97 82 77 87 97 97100100 87 76 69 84 97 97100100
WIND DIR                S SE SE  S  S  S  S SW  W  W SW  W SW  W  N  N  N  E  E
WIND SPD                4  3  3  3  4  3  2  1  1  1  1  1  2  1  1  0  0  1  1
WIND GUST              14                                                      
CLOUDS                 OV B2 B2 OV B2 B1 B1 B1 B1 B1 B1 SC B1 B2 B1 B1 B1 B1 B2
CLOUDS(%)              88 85 87 89 70 69 66 56 58 66 61 45 52 86 64 58 54 61 71
VSBY                    7  7  6  7  6  6  6  1  1  1  1 10  7  6  6  7 10 10  6
POP 12HR                     50          70          50          60          50
RAIN SHWRS             IS SC SC IS SC SC SC IS             SC NM SC IS       SC
TSTMS                     IS    IS SC SC SC IS             SC SC IS            
Obvis                                       PF PF PF PF                        
MIX HGT                <1 <1  1  2  3  3  1 <1 <1 <1 <1  2  4  3 <1            
T WIND DIR              S  S  S  S  S  S  S SW SW SW SW  W SW SW SW            
T WIND SPD             18  9 13 20 18 20 19 19  3  3  5 11 10  5  2            
DISPERSION             VP VP             VP VP VP VP             VP VP VP VP   
ADI                    12  4 20 48 58 69  9  9  2  2  6 35 49 21  1            
MAX LVORI               5  9  5  4  4  3  5  8 10 10  9  4  3  3  6            
STABILITY               E  F  B  B  C  B  F  F  F  F  A  A  B  B  F            
CEILING                     700   700   600   700  2700  None  2400  None      
STA PRES                  27.07 27.07 27.05 27.10 27.12 27.17 27.18            


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       79      63      82      63      84      64      84      64      84
TEMP          76 70 64 64 77 74 65 65 79 74 65 66 80 74 65 65 80 74
DEWPT         67 66 63 64 68 68 64 65 67 68 64 65 68 68 65 65 68 68
RH            74 87 97100 74 82 97100 67 82 97 97 67 82100100 67 82
WIND SPD          <15     <15     <15     <15     <15     <15     <15     <15     <15
AVG CLOUDS    B1 B2 B1 B1 B1 B2 SC SC SC B2 SC SC SC B2 SC SC SC B2
POP 12HR           70      10      70      10      60      10      60      20      60
RAIN SHWRS    SC NM       SC NM          NM       IS NM IS    IS NM
TSTMS         IS SC       IS SC          SC       IS SC IS    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