
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
VAZ024-022000-
RAWS 441631
37.63N 79.51W Elev. 865 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 84 68 87 67 85
TEMP 75 80 82 78 72 71 70 71 81 87 85 78 72 69 67 69 78 84 84 77
DEWPT 73 74 75 73 72 71 70 71 73 72 73 72 70 69 67 69 71 70 71 71
MAX/MIN RH 80 100 61 100 63
RH 94 82 79 85100100100100 77 61 67 82 93100100100 79 63 65 82
WIND DIR SE S SE SE SE SE N N SW SW S S NE N NE NE E SE SE SE
WIND SPD 2 4 4 2 1 1 0 0 1 3 3 1 1 0 1 1 1 3 3 1
CLOUDS OV B2 B2 B2 B2 B1 B2 B1 B1 B1 B1 B1 B1 B1 B2 B2 B2 B2 B2 B1
CLOUDS(%) 93 86 87 79 78 68 74 56 51 54 63 68 59 65 71 70 77 76 76 60
VSBY 0 7 9 5 3 0 0 0 10 10 10 7 7 7 7 7 7 7 7 7
POP 12HR 90 70 60 50 60
RAIN SHWRS O O O NM SC SC SC SC SC IS IS SC SC NM NM SC
TSTMS O NM NM SC SC SC SC SC IS SC SC IS
Obvis PF PF PF PF
MIX HGT 1 2 2 <1 <1 <1 <1 <1 2 4 3 <1 <1 <1 <1 <1 2 3 3 <1
T WIND DIR SE S S SE S S S SW SW SW S S S S SE S S S S S
T WIND SPD 8 16 16 9 9 6 6 8 6 6 9 12 9 6 6 8 10 11 12 12
DISPERSION VP VP VP VP VP VP VP VP VP
ADI 14 41 37 4 4 3 3 9 22 35 37 6 4 3 3 8 27 43 41 6
MAX LVORI 5 3 3 5 9 9 9 8 3 1 3 4 6 9 9 8 3 1 1 4
STABILITY B C C F F F F B B B B F F F F B B B B F
CEILING 100 2800 1400 None None 3200 3600 3600 3200 4700
STA PRES 28.32 28.30 28.31 28.33 28.38 28.38 28.44 28.47 28.50 28.49
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 87 68 89 68 89 68 90
TEMP 69 70 85 80 71 70 87 81 72 71 87 81 71 70 88 80
DEWPT 69 69 72 72 70 70 72 73 70 70 72 73 71 70 72 73
RH 100 97 65 77 97100 61 77 93 97 61 77100100 59 79
WIND SPD <15 <15 <15 <15 <15 <15 <15 <15
AVG CLOUDS B1 B1 B1 B2 SC SC B1 B1 SC SC SC B2 SC SC SC B1
POP 12HR 40 60 20 50 20 60 20 50
RAIN SHWRS SC IS IS NM IS IS SC IS NM IS SC
TSTMS 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