
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