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

NCZ003-022000-
RAWS 310302
36.35N  80.48W Elev. 1076 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                 80          69          81          68          80
TEMP                73 76 78 75 71 71 70 70 75 80 80 75 70 69 68 69 74 78 78 74
DEWPT               73 75 75 73 71 71 70 70 73 73 72 72 70 69 68 69 71 72 72 71
MAX/MIN RH                   90         100          76         100          79
RH                 100 97 91 94100100100100 94 79 77 90100100100100 90 82 82 90
WIND DIR             S  S  S  S  S SW SW SW SW SW SW  S  S  N NE NE  E SE SE  E
WIND SPD             5  6  5  5  4  3  3  3  3  5  4  2  2  2  3  4  4  4  3  2
CLOUDS              OV B2 OV B2 B2 OV B2 B2 B1 SC B2 B1 B1 B1 B1 B1 B1 B2 B2 B2
CLOUDS(%)           90 86 95 70 76 89 84 86 65 48 83 63 57 59 66 64 62 83 83 75
VSBY                 5 10  7  8  5  4  2  3 10 10 10  7  7  7  7  7  7  7  7  7
POP 12HR                     90          60          50          40          70
RAIN SHWRS          NM  O  O NM SC IS          IS SC SC SC IS IS SC SC NM NM NM
TSTMS               NM NM NM SC SC             IS SC SC             IS SC SC SC
MIX HGT              2  2  3 <1 <1 <1 <1 <1  2  4  4 <1 <1 <1 <1 <1  2  4  3 <1
T WIND DIR           S  S  S  S  S  S SW SW SW  S  S  S  S  S SE  S  S  S  S  S
T WIND SPD          11 13 16  9  8 10  9  9  9  8 10  9  8  9  6  8 11 11 12  8
DISPERSION                   PR VP VP VP             VP VP VP VP             VP
ADI                 25 40 48  6  5  5  4 12 25 39 37  4  4  4  3  8 31 41 40  4
MAX LVORI            4  4  4  6  9  9  9  7  5  3  3  6  9  9  9  8  4  3  3  6
STABILITY            C  C  C  E  E  F  F  B  B  A  C  F  F  F  F  C  C  C  B  F
CEILING               300  2300  2100  1500   800  2700  2700  2700   500  1400
STA PRES            28.75 28.72 28.75 28.78 28.83 28.81 28.86 28.89 28.94 28.94


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      81      68      83      68      82      69      83
TEMP          68 69 78 76 70 70 81 77 70 70 80 76 70 70 81 77
DEWPT         68 69 73 72 70 70 74 72 70 70 74 73 70 70 74 73
RH           100100 85 87100100 79 85100100 82 90100100 79 87
WIND SPD          <15     <15     <15     <15     <15     <15     <15     <15
AVG CLOUDS    B2 B1 B1 B2 SC SC B1 B2 SC B1 B1 B1 SC SC B1 B1
POP 12HR           60      60      20      60      30      50      20      50
RAIN SHWRS    NM IS IS NM IS    IS NM SC    IS SC IS IS    SC
TSTMS         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