
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 Sat Aug 1 2026
VAZ018-012000-
RAWS 444002
37.56N 80.18W Elev. 2702 ft
131 PM EDT Sat Aug 1 2026
Date Sat 08/01/26 Sun 08/02/26 Mon 08/03/26
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 77 68 82
TEMP 83 81 72 71 70 69 68 72 75 76 73 70 70 69 69 76 81 79 72
DEWPT 63 65 68 67 67 68 68 72 73 74 72 70 69 68 69 72 72 73 71
MAX/MIN RH 51 100 93 100 75
RH 51 58 87 87 90 97100100 94 94 97100 97 97100 87 74 82 97
WIND DIR S S S S S SE SE SE SE SE S SE SW SW SW S S S S
WIND SPD 6 8 6 6 5 4 4 4 5 4 3 2 1 1 1 2 3 3 2
WIND GUST 19 21 23 23 23 18 16 14 16 14 13
CLOUDS OV B2 OV B2 OV OV B2 OV OV OV OV B2 B2 B1 SC B1 B2 B2 B1
CLOUDS(%) 92 79 91 79 90 94 87 93 93 96 89 78 74 67 49 56 84 84 66
VSBY 10 10 7 6 7 5 2 3 4 7 7 3 7 7 7 7 7 7 7
POP 12HR 30 90 100 80 80
RAIN SHWRS IS SC SC NM O O SC NM O O NM IS IS O O SC
TSTMS IS IS IS IS IS IS SC NM SC IS IS SC SC IS
MIX HGT 5 4 1 <1 <1 <1 <1 1 2 2 <1 <1 <1 <1 <1 3 4 3 <1
T WIND DIR S S S SE SE SE SE S S S S S S SW SW SW SW SW SW
T WIND SPD 18 18 12 13 12 9 12 13 17 19 14 11 10 8 8 13 10 5 4
DISPERSION PR PR PR VP VP VP VP VP VP
ADI 76 66 8 9 8 6 10 22 45 48 7 5 5 4 9 47 52 23 2
MAX LVORI 1 1 5 5 5 6 8 5 4 4 6 9 7 8 8 4 3 3 9
STABILITY C C E E E E C C C C F F F F A B B B F
CEILING 3000 900 600 600 1800 500 600 None 3000
STA PRES 27.65 27.63 27.62 27.62 27.58 27.61 27.63 27.68 27.69
Date Tue 08/04/26Wed 08/05/26Thu 08/06/26Fri 08/07/26
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 80 67 82 67 83 68 86
TEMP 68 68 80 72 69 69 81 72 69 69 83 73 69 70 84 73
DEWPT 67 68 72 71 67 68 72 71 68 68 72 72 67 68 72 71
RH 97100 77 97 93 97 74 97 97 97 70 97 93 93 67 93
WIND SPD <15 <15 <15 <15 <15 <15 <15 <15
AVG CLOUDS B1 B1 B1 B2 B1 B1 B1 B2 SC SC SC B1 SC SC SC B1
POP 12HR 30 80 20 70 20 50 20 50
RAIN SHWRS SC SC O IS SC NM IS IS SC IS SC
TSTMS IS 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