Severe Thunderstorms in the Midwest and Arizona; Heat Continues in the Southeast and Southwest

Thunderstorms, some severe, may lead to scattered instances of flash flooding across the Midwest and Ohio Valley and southern Arizona. The threat will shift to the Mid-Atlantic coast on Thursday. Dangerous heat persists in the South and Southeast while building into the Southwest. Overnight lows will be so warm that little-to-no relief from the scorching daytime highs will be available. Read More >

Hazardous Weather Conditions

Hazardous Weather Outlook

Current conditions at

Knoxville, McGhee Tyson Airport (KTYS)

Lat: 35.82°NLon: 83.99°WElev: 981ft.

Mostly Cloudy

73°F

23°C

Humidity	87%
Wind Speed	Calm
Barometer	29.97 in (1013.4 mb)
Dewpoint	69°F (21°C)
Visibility	10.00 mi
Last update	20 Aug 3:53 am EDT

More Information:

Local Forecast Office More Local Wx 3 Day History Hourly Weather Forecast

Extended Forecast for

6 Miles SSW Mascot TN

Today
High: 91 °F
Chance
Showers then
Partly Sunny
Tonight
Low: 70 °F
Chance
T-storms then
Showers
Likely
Friday
High: 88 °F
Chance
Showers then
Slight Chance
T-storms
Friday Night
Low: 68 °F
Chance
T-storms then
Partly Cloudy
Saturday
High: 90 °F
Hot
Saturday Night
Low: 67 °F
Mostly Clear
Sunday
High: 88 °F
Sunny
Sunday Night
Low: 63 °F
Mostly Clear
Monday
High: 87 °F
Sunny

Detailed Forecast

Today

A 30 percent chance of showers and thunderstorms, mainly before 9am. Partly sunny and hot, with a high near 91. Heat index values as high as 98. Calm wind becoming south around 5 mph in the afternoon.

Tonight

A chance of showers and thunderstorms before midnight, then showers likely and possibly a thunderstorm between midnight and 2am, then a chance of showers and thunderstorms after 2am. Mostly cloudy, with a low around 70. Southwest wind around 5 mph becoming calm. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.

Friday

A chance of showers and thunderstorms before 8am, then a slight chance of showers and thunderstorms after 4pm. Partly sunny, with a high near 88. Heat index values as high as 96. Calm wind becoming west around 5 mph in the afternoon. Chance of precipitation is 30%.

Friday Night

A 30 percent chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 68. Calm wind.

Saturday

Mostly sunny and hot, with a high near 90. Calm wind becoming west around 5 mph.

Saturday Night

Mostly clear, with a low around 67. West wind around 5 mph becoming calm in the evening.

Sunday

Sunny, with a high near 88. Calm wind becoming northwest around 5 mph in the afternoon.

Sunday Night

Mostly clear, with a low around 63.

Monday

Sunny, with a high near 87.