National Weather Service United States Department of Commerce

Heavy Rainfall and Severe Thunderstorms in the Midwest and Ohio Valley Tuesday

Multiple rounds of severe thunderstorms appear likely Tuesday across the Midwest and Ohio Valley, with severe wind gusts in excess of 75 mph as the primary threat. Heavy to excessive rainfall may lead to considerable flash and urban flooding impacts Tuesday across portions of the Ohio Valley. A Moderate Risk (level 3 of 4) of excessive rainfall has been issued. Read More >

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EXPERIMENTAL...FIRE WEATHER POINT FORECAST MATRICES
NATIONAL WEATHER SERVICE Blacksburg VA
801 PM EDT Mon Aug 10 2026

NCZ018-110800-
RAWS 311941
36.22N  81.63W Elev. 3254 ft
801 PM EDT Mon Aug 10 2026

Date           08/10/26      Tue 08/11/26            Wed 08/12/26            Thu
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                 65          82          67          81          65
TEMP                70 67 67 69 75 79 81 76 72 70 69 69 75 80 78 72 69 67 66 67
DEWPT               64 63 64 65 66 66 66 66 67 67 67 67 66 66 66 65 66 65 65 65
MIN/MAX RH                   94          61         100          63          98
RH                  81 87 90 87 74 64 60 71 84 90 93 93 74 62 67 79 90 93 97 93
WIND DIR            NW NW  W  W  W NW  W  W  W  W  W NW NW  W  W NW  W  W  W  W
WIND SPD             4  5  5  6 13 11  8  6  6  9 12 14 13 11  9  5  5  5  8 10
WIND GUST              17 20 23 25             21 26 27 24                     
CLOUDS              SC SC B1 SC FW SC SC SC SC SC SC B2 B1 SC SC SC SC SC B1 B1
CLOUDS(%)           30 37 52 37 18 42 48 48 41 48 39 75 52 47 40 38 37 38 52 58
VSBY                10 10 10  9 10 10 10 10 10  7 10 10 10 10 10 10            
POP 12HR                     20          20          30          20          20
RAIN SHWRS                         IS          IS    IS IS IS IS IS IS         
TSTMS                              IS          IS       IS IS IS IS            
MIX HGT             <1 <1 <1 <1  2  3  3 <1 <1 <1 <1  1  2  3  3 <1            
T WIND DIR          NW  N  N  N NW NW  W  W  W  W NW  W  W  W  N  W            
T WIND SPD           4  6  5 16 14 23 18 11  8  3  9 11 25 23  4  4            
DISPERSION          VP PR PR             PR PR PR FR             PR PR PR PR   
ADI                  4  5  5 12 39 77 59  8  5  3  8 15 51 74 16  2            
MAX LVORI            5  5  6  4  3  1  1  3  5  6  6  5  3  1  3  4            
STABILITY            D  E  D  C  C  C  B  E  E  D  D  D  D  C  B  F            
CEILING              None  None  None  None  None   200  4300  None  None      
STA PRES            27.00 26.98 26.98 26.93 26.93 26.90 26.89 26.85            


Date           08/13Fri 08/14/26Sat 08/15/26Sun 08/16/26Mon 08/17/26
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       82      67      82      66      80      66      83      67      83
TEMP          81 76 69 69 80 75 68 67 78 74 68 67 81 75 69 68 81 75
DEWPT         67 67 66 66 68 67 66 66 67 67 65 65 66 66 65 65 66 65
RH            63 74 90 90 67 76 93 97 69 79 90 93 60 74 87 90 60 71
WIND SPD          <15     <15     <15     <15     <15     <15     <15     <15     <15
AVG CLOUDS    B1 B1 B1 SC SC B1 B1 B1 B1 B1 SC SC SC B1 SC SC SC B1
POP 12HR           10       5      30      20      50      20      30      10      30
RAIN SHWRS                   SC IS    IS SC IS       SC          SC
TSTMS                        SC IS    IS SC IS       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