National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Severe Thunderstorms and Heavy Rain in the Mid-South, Tennessee and Ohio Valleys

Severe thunderstorms are likely across portions of the Mid-South, Tennessee Valley, and lower Ohio River Valley today, including damaging winds, hail, and tornadoes, a few of which could be strong. Heavy to excessive rainfall, which may lead to flooding, is expected over the Tennessee and lower Ohio Valleys today. Read More >

Hazardous Weather Conditions

Current conditions at

Knoxville, McGhee Tyson Airport (KTYS)

Lat: 35.82°NLon: 83.99°WElev: 981ft.

Mostly Cloudy

71°F

22°C

Humidity 84%
Wind Speed Calm
Barometer 29.91 in (1011.8 mb)
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Last update 20 May 8:53 am EDT
Extended Forecast for

Knoxville, McGhee Tyson Airport TN

  • Today

    Today: A slight chance of showers, then a chance of showers and thunderstorms after 3pm. Some of the storms could be severe. Mostly sunny, with a high near 86. Light southwest wind increasing to 10 to 15 mph in the morning. Winds could gust as high as 25 mph. Chance of precipitation is 30%.

    High: 86 °F

    Slight Chance
    Showers then
    Severe
    Thunderstorms

  • Tonight

    Tonight: Showers and thunderstorms, mainly before 1am. Some of the storms could be severe and produce heavy rainfall. Low around 65. Southwest wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.

    Low: 65 °F

    Severe
    Thunderstorms

  • Wednesday

    Wednesday: A 10 percent chance of showers and thunderstorms before 7am. Mostly cloudy, then gradually becoming sunny, with a high near 79. West wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 79 °F

    Slight Chance
    T-storms then
    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 56. Southwest wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 56 °F

    Mostly Clear

  • Thursday

    Thursday: A slight chance of showers before 2pm, then a chance of showers and thunderstorms between 2pm and 5pm, then a chance of showers after 5pm. Mostly sunny, with a high near 73. Southwest wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 40%.

    High: 73 °F

    Slight Chance
    Showers then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and 2am. Partly cloudy, with a low around 49. West wind 5 to 10 mph. Chance of precipitation is 30%.

    Low: 49 °F

    Chance
    Showers

  • Friday

    Friday: Sunny, with a high near 71. Northwest wind 5 to 10 mph.

    High: 71 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 49.

    Low: 49 °F

    Partly Cloudy

  • Saturday

    Saturday: A 20 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 71.

    High: 71 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

Detailed Forecast

Today
A slight chance of showers, then a chance of showers and thunderstorms after 3pm. Some of the storms could be severe. Mostly sunny, with a high near 86. Light southwest wind increasing to 10 to 15 mph in the morning. Winds could gust as high as 25 mph. Chance of precipitation is 30%.
Tonight
Showers and thunderstorms, mainly before 1am. Some of the storms could be severe and produce heavy rainfall. Low around 65. Southwest wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.
Wednesday
A 10 percent chance of showers and thunderstorms before 7am. Mostly cloudy, then gradually becoming sunny, with a high near 79. West wind 10 to 15 mph, with gusts as high as 25 mph.
Wednesday Night
Mostly clear, with a low around 56. Southwest wind 5 to 10 mph, with gusts as high as 20 mph.
Thursday
A slight chance of showers before 2pm, then a chance of showers and thunderstorms between 2pm and 5pm, then a chance of showers after 5pm. Mostly sunny, with a high near 73. Southwest wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 40%.
Thursday Night
A chance of showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and 2am. Partly cloudy, with a low around 49. West wind 5 to 10 mph. Chance of precipitation is 30%.
Friday
Sunny, with a high near 71. Northwest wind 5 to 10 mph.
Friday Night
Partly cloudy, with a low around 49.
Saturday
A 20 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 71.
Saturday Night
A slight chance of showers and thunderstorms before 8pm, then a chance of showers after 2am. Partly cloudy, with a low around 55. Chance of precipitation is 30%.
Sunday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 74.
Sunday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 58.
Memorial Day
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 76. Chance of precipitation is 60%.
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ABOUT THIS FORECAST

 
Point Forecast:
Knoxville, McGhee Tyson Airport TN
 35.81°N 84.01°W (Elev. 899 ft)
Last Update:
7:16 am EDT May 20, 2025
Forecast Valid:
9am EDT May 20, 2025-6pm EDT May 26, 2025
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation