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
131 PM EDT Sun Aug 2 2026

VAZ046-022000-
RAWS 441101
37.39N  78.80W Elev. 804 ft
131 PM 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                 83          70          86          68          82
TEMP                   80 81 76 73 73 72 72 79 85 84 77 72 71 69 69 77 81 80 76
DEWPT                  73 73 74 73 72 72 72 75 74 73 75 72 71 69 69 71 72 72 72
MAX/MIN RH                   86         100          72         100          73
RH                     79 77 94100 97100100 88 70 70 94100100100100 82 74 77 87
WIND DIR                S  S  S  S  S  S SW SW SW  S SE NE NE NE NE NE NE  E  E
WIND SPD                8  8  6  5  6  5  5  5  5  5  3  2  2  4  5  6  5  5  3
WIND GUST                    17 16 17                                          
CLOUDS                 B1 B2 B2 OV OV OV B2 B2 B1 B1 B1 B2 B1 B2 B2 B2 B2 B2 B1
CLOUDS(%)              67 75 72 91 89 91 87 70 65 55 56 76 55 77 81 70 76 79 67
VSBY                    9 10 10  6  6  5  3 10 10 10 10  5 10 10 10 10  6  6  6
POP 12HR                     70          80          40          60          40
RAIN SHWRS             SC SC  O NM SC             SC SC SC             SC SC SC
TSTMS                  SC SC SC SC                SC SC IS             SC SC SC
MIX HGT                 3  2 <1 <1 <1 <1  1  3  4  4 <1 <1 <1 <1 <1  2  3  3 <1
T WIND DIR              S  S  S  S  S  S  S SW SW  W NE NE  N NE NE NE NE NE NE
T WIND SPD             20 16 11 13 10  9  9 11  8  5  4  3  3 17 14 11  6  5  5
DISPERSION                   PR PR PR PR             VP VP VP VP             VP
ADI                    61 44  8  9  7  6 14 33 30 21  2  2  2 12 15 29 21 19  3
MAX LVORI               4  4  8  8  8  8  5  4  3  3  6 10 10  7  5  4  3  3  6
STABILITY               C  C  E  E  E  E  C  C  C  C  F  F  F  E  C  C  C  C  F
CEILING                    2100  2000   100   600  None  3800  3000  2200  1900
STA PRES                  29.07 29.08 29.08 29.11 29.11 29.19 29.25 29.32 29.31


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      84      69      87      70      87      70      88
TEMP          69 70 83 77 71 72 86 79 72 72 87 79 72 72 87 78
DEWPT         69 70 75 75 71 72 77 75 72 72 76 75 72 72 76 75
RH           100100 77 94100100 75 88100100 70 88100100 70 91
WIND SPD          <15     <15     <15     <15     <15     <15     <15     <15
AVG CLOUDS    B2 B2 B1 B2 B1 B1 B1 B1 SC SC SC B1 SC SC SC B1
POP 12HR           50      60      20      30      10      30      20      40
RAIN SHWRS    SC SC SC NM IS       SC          SC IS       SC
TSTMS         SC    IS SC IS       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