National Weather Service United States Department of Commerce

Severe Weather and Heavy Rainfall from the Midwest to the Ohio Valley; Mid-Summer Heat Continues

Severe thunderstorm and heavy rainfall threats will persist from the Midwest to Lower Great Lakes through Monday, shifting into the Ohio Valley and Central Appalachians Monday evening into Tuesday. Mid-summer heat will continue across much of the CONUS this week, with record highs possible well into the 100s across the south-central High Plains. Read More >

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EXPERIMENTAL...FIRE WEATHER POINT FORECAST MATRICES
NATIONAL WEATHER SERVICE Blacksburg VA
801 PM EDT Sun Aug 9 2026

VAZ018-100800-
RAWS 444002
37.56N  80.18W Elev. 2702 ft
801 PM EDT Sun Aug 9 2026

Date           08/09/26      Mon 08/10/26            Tue 08/11/26            Wed
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                 67          90          71          88          68
TEMP                69 68 67 70 83 87 88 79 75 73 72 72 82 87 85 76 73 71 69 71
DEWPT               67 66 65 67 70 69 68 68 67 68 68 68 71 71 70 69 68 68 67 68
MIN/MAX RH                  100          51          88          58          94
RH                  93 93 93 90 65 55 52 69 76 84 87 87 69 59 61 79 84 90 93 90
WIND DIR             W  W  W NW  W  W  W  W  W  W  W  W  W  W  W  W  W  W  W  W
WIND SPD             2  2  2  3  5  5  6  4  5  6  6  6  8  6  6  5  6  5  8  6
WIND GUST                       16    17 16 18 21 25 23 23 20 21 20 20 21 26 26
CLOUDS              B1 SC SC FW FW FW SC SC SC B1 B1 SC SC B1 B1 B1 B1 B1 B1 B1
CLOUDS(%)           54 39 37 21 19 24 41 42 49 63 64 46 47 65 65 65 65 54 55 57
VSBY                10  8  5  4 10 10 10 10 10 10  9  7 10  6  6  6  6  7  7  7
POP 12HR                     20           5          20          50          50
RAIN SHWRS                               IS                SC SC SC SC IS IS IS
TSTMS                                    IS                SC SC SC            
MIX HGT             <1 <1 <1 <1  3  5  5 <1 <1 <1 <1 <1  3  3  3 <1            
T WIND DIR           W  W  W  W  W  W  W  W  W  N  W  W  W  W  W  W            
T WIND SPD           4  3  3  4 12 13 13 12 14 20  9  8  9 17 20 12            
DISPERSION          VP VP VP             VP PR PR PR             PR PR PR PR   
ADI                  2  2  2  4 54 84 80  8 10 14  6  9 31 59 71  8            
MAX LVORI            5  6  7  5  1  1  1  3  4  4  5  5  3  1  1  4            
STABILITY            F  G  G  A  A  A  B  E  E  E  E  B  B  C  C  E            
CEILING              None  None  None  None  None 14300  8400   600 23000      
STA PRES            27.86 27.89 27.88 27.82 27.89 27.84 27.84 27.75            


Date           08/12Thu 08/13/26Fri 08/14/26Sat 08/15/26Sun 08/16/26
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       86      69      86      68      82      66      83      67      84
TEMP          85 77 71 71 84 78 71 69 80 74 68 68 80 75 69 69 81 75
DEWPT         71 69 68 68 71 70 68 68 70 68 66 65 69 68 66 66 70 69
RH            63 76 90 90 65 76 90 97 72 82 93 90 69 79 90 90 69 82
WIND SPD          <15     <15     <15     <15     <15     <15     <15     <15     <15
AVG CLOUDS    B1 B1 B1 B1 B1 B1 SC B1 B1 B2 B1 B1 B1 B1 B1 B1 B1 B1
POP 12HR           40      40      20      20      50      40      40      40      40
RAIN SHWRS    IS SC SC    IS IS IS    SC SC SC SC SC SC SC SC SC SC
TSTMS         IS SC IS       IS          SC IS       IS          IS

$$


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