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

Lala Impacting Hawaii; Severe Thunderstorm and Flash Flooding Risks; Excessive Heat

Areas of gusty winds, heavy rain leading to flash flooding, and high surf continue across portions of Hawaii as Tropical Storm Lala continues to move away from the islands. Severe thunderstorm, heavy rainfall, and flash flooding threats continue from the Midwest to the Mid-Atlantic and across the central High Plains. Record heat continues for areas of the central/southern Plain into the Southeast Read More >

Hazardous Weather Conditions

Current conditions at

Knoxville, McGhee Tyson Airport (KTYS)

Lat: 35.82°NLon: 83.99°WElev: 981ft.

Fair

79°F

26°C

Humidity 79%
Wind Speed Calm
Barometer 30.05 in (1016.1 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index82°F (28°C)
Last update 17 Aug 12:53 am EDT
Extended Forecast for

2 Miles NNE Maryville TN

Heat Advisory August 17, 01:10am until August 17, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory August 17, 01:10am until August 17, 08:00pm

    NOW until 8:00pm Mon

    Heat Advisory

  • Overnight

    Low: 76 °F

    Mostly Clear

  • Monday

    Monday: A 40 percent chance of showers and thunderstorms, mainly after 3pm. Sunny and hot, with a high near 95. Heat index values as high as 103. Southwest wind 5 to 10 mph.

    High: 95 °F

    Sunny then
    Chance
    T-storms

  • Monday Night

    Monday Night: A chance of showers and thunderstorms before 2am, then a slight chance of showers between 2am and 3am. Mostly cloudy, with a low around 73. West wind around 5 mph becoming calm in the evening. Chance of precipitation is 50%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 73 °F

    Chance
    T-storms then
    Chance
    Showers

  • Tuesday

    Tuesday: Mostly sunny and hot, with a high near 91. Heat index values as high as 98. Calm wind becoming northwest around 5 mph.

    High: 91 °F

    Hot

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 70. North wind around 5 mph becoming calm.

    Low: 70 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Sunny and hot, with a high near 94. Calm wind becoming northwest around 5 mph in the afternoon.

    High: 94 °F

    Hot

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers after 2am. Partly cloudy, with a low around 73. Calm wind becoming southeast around 5 mph.

    Low: 73 °F

    Partly Cloudy
    then Slight
    Chance
    Showers

  • Thursday

    Thursday: A 50 percent chance of showers and thunderstorms, mainly after 2pm. Mostly sunny and hot, with a high near 92.

    High: 92 °F

    Slight Chance
    T-storms then
    Chance
    T-storms

Detailed Forecast

Overnight
Mostly clear, with a low around 76. Southwest wind around 5 mph.
Monday
A 40 percent chance of showers and thunderstorms, mainly after 3pm. Sunny and hot, with a high near 95. Heat index values as high as 103. Southwest wind 5 to 10 mph.
Monday Night
A chance of showers and thunderstorms before 2am, then a slight chance of showers between 2am and 3am. Mostly cloudy, with a low around 73. West wind around 5 mph becoming calm in the evening. Chance of precipitation is 50%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tuesday
Mostly sunny and hot, with a high near 91. Heat index values as high as 98. Calm wind becoming northwest around 5 mph.
Tuesday Night
Partly cloudy, with a low around 70. North wind around 5 mph becoming calm.
Wednesday
Sunny and hot, with a high near 94. Calm wind becoming northwest around 5 mph in the afternoon.
Wednesday Night
A 20 percent chance of showers after 2am. Partly cloudy, with a low around 73. Calm wind becoming southeast around 5 mph.
Thursday
A 50 percent chance of showers and thunderstorms, mainly after 2pm. Mostly sunny and hot, with a high near 92.
Thursday Night
A 30 percent chance of showers and thunderstorms, mainly before 2am. Mostly cloudy, with a low around 70.
Friday
A 50 percent chance of showers and thunderstorms, mainly after 2pm. Partly sunny, with a high near 89.
Friday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 68.
Saturday
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 88.
Saturday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 66.
Sunday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 88.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles NNE Maryville TN
 35.78°N 83.96°W (Elev. 899 ft)
Last Update:
1:06 am EDT Aug 17, 2026
Forecast Valid:
1am EDT Aug 17, 2026-6pm EDT Aug 23, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation