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
401 PM EDT Sat Aug 1 2026

NCZ006-020800-
RAWS 310801
36.37N  79.29W Elev. 580 ft
401 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                 70          85          70          85          69
TEMP          85 80 76 74 72 72 77 82 81 77 74 73 72 72 78 83 84 79 73 72 70 72
DEWPT         67 69 69 69 70 72 76 77 77 76 74 73 72 72 77 76 76 76 73 72 70 72
MIN/MAX RH                  100          81         100          76         100
RH            55 69 79 84 93100 97 85 88 97100100100100 97 80 77 91100100100100
WIND DIR       S SE  S SE SE SE  S  S  S  S  S  S  S  S SW  S  S  S  S  N  N  N
WIND SPD       8  5  5  3  3  3  5  6  5  5  3  2  3  3  4  5  5  2  1  0  0  0
CLOUDS        B2 OV OV B2 OV B2 B2 B2 B2 OV B2 B1 B2 B1 B2 B1 B1 B1 B1 B1 B2 B1
CLOUDS(%)     81 88 89 73 89 77 87 73 81 89 78 63 74 57 72 69 69 57 64 56 72 69
VSBY          10 10 10 10 10  5  7  8  9  8  5  7  7  7  7  7  7  7  7  7  7  7
POP 12HR                     50          80          80          50          30
RAIN SHWRS          IS SC SC SC SC NM NM  O NM SC SC IS IS SC SC SC SC IS IS SC
TSTMS               IS SC SC    IS NM NM SC SC IS       IS SC SC IS IS         
MIX HGT        5 <1 <1 <1 <1  1  2  3  3 <1 <1 <1 <1  1  2  3  4 <1            
T WIND DIR     S  S SE SE  S  S  S  S  S  S  S  S  S SW SW SW SW  S            
T WIND SPD    19  4 11 14 10 10 12 14 13  8  8  6 13 14 19 14 14 17            
DISPERSION       PR PR VP VP             PR VP VP VP             VP VP VP VP   
ADI           81  3  8  7  5 14 32 52 40  5  4  3  6 20 47 49 55  8            
MAX LVORI      1  3  4  5  7  5  4  4  4  7  9  9  8  5  4  3  3  5            
STABILITY      C  E  E  F  F  B  C  C  C  E  F  F  F  B  C  C  C  F            
CEILING              3100   700   900  3300  4200  1000  1400  3600  4400      
STA PRES            29.21 29.20 29.19 29.16 29.18 29.21 29.25 29.25            


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       84      69      85      69      86      70      87      70      88
TEMP          83 80 73 71 83 79 72 72 84 80 73 72 85 81 72 72 86 81
DEWPT         76 75 72 71 75 75 72 72 76 75 73 72 76 75 72 72 75 75
RH            80 85 97100 77 88100100 77 85100100 75 82100100 70 82
WIND SPD          <15     <15     <15     <15     <15     <15     <15     <15     <15
AVG CLOUDS    B1 B2 B1 SC SC B1 B1 SC B1 B1 B1 SC B1 B1 SC FW FW B1
POP 12HR           70      30      50      20      40      30      40      30      30
RAIN SHWRS    SC NM SC IS IS SC IS IS    SC SC    IS SC SC       SC
TSTMS         IS SC SC       SC IS       SC IS       SC SC       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