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

VAZ046-100800-
RAWS 441101
37.39N  78.80W Elev. 804 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                 73          94          74          93          70
TEMP                77 74 73 74 86 93 93 86 80 78 75 76 87 93 91 82 76 73 71 73
DEWPT               70 69 68 70 71 70 69 69 69 69 68 70 72 71 71 71 71 70 69 70
MIN/MAX RH                   87          46          82          49          94
RH                  79 84 84 87 61 47 46 57 69 74 79 82 61 49 52 69 85 90 93 90
WIND DIR             S SW SW  W  W  W  W SW  W  W  W  W  W  W  W  W  W  W  W  W
WIND SPD             4  3  3  3  5  8  9  5  5  5  5  4  5  8  8  5  4  4  4  4
CLOUDS              SC SC SC SC SC FW SC FW SC SC SC SC B1 B1 B1 B1 B1 B1 SC SC
CLOUDS(%)           50 35 42 34 37 24 33 25 34 48 33 36 52 64 64 51 52 56 44 44
VSBY                10 10  8 10 10 10 10 10 10 10 10 10 10  6  6  7  7 10 10 10
POP 12HR                     20           5          10          50          20
RAIN SHWRS                                                 SC SC IS IS         
TSTMS                                                      SC SC IS            
MIX HGT             <1 <1 <1 <1  4  7  6 <1 <1 <1 <1 <1  4  5  5 <1            
T WIND DIR          SW SW SW SW SW  W  W SW  W NW SW  W  N  W  W  W            
T WIND SPD           4  4  3  3  8 11 12 12  6 25 11  9 11 14 17  9            
DISPERSION          VP VP VP             PR PR PR PR             PR VP VP VP   
ADI                  3  2  2  3 42 87 88  6  3 17  5  9 49 64 94  6            
MAX LVORI            4  5  6  6  1  1  1  3  3  3  4  4  1  1  1  3            
STABILITY            E  G  F  A  A  B  B  F  F  E  F  A  B  C  B  E            
CEILING              None  None  None  None  None  None  None  9100  None      
STA PRES            29.33 29.36 29.33 29.27 29.31 29.27 29.31 29.18            


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       92      71      93      70      86      67      85      67      87
TEMP          91 84 74 72 91 86 75 72 85 79 71 68 83 78 70 69 85 80
DEWPT         72 71 70 70 72 70 69 68 70 70 68 66 68 68 67 67 71 70
RH            54 65 87 93 54 59 82 87 61 74 90 93 61 71 90 93 63 72
WIND SPD          <15     <15     <15     <15     <15     <15     <15     <15     <15
AVG CLOUDS    B1 SC B1 B1 SC SC SC B1 B1 B1 B1 B1 SC SC B1 SC SC SC
POP 12HR           20      30      20      10      40      50      20      30      20
RAIN SHWRS       IS SC       IS          SC SC IS IS IS SC IS    IS
TSTMS            IS IS       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