It has been pleasant but on the warm side the past few days. Sadly, this will change as the clouds have moved in and soon, the showers will too. Right now looking at radar we have a few light showers across the area in places like Loudon and Harriman. These showers will be moving east and will soon hit Oak Ridge, Maryville, and Knoxville. These showers will be light and short lived, so I expect little impacts. The bulk of today's showers will arrive this afternoon between 4-6. Use caution for those apart of the evening commute, as it will likely be a bit "wet and nasty".
As you can see below, this "precipitation type" model shows showers likely moving in. These showers will likely be heavy at times with thunder embedded within. These should stick around until the overnight hours before moving out and leaving a mostly cloudy Friday. We cannot rule out some scattered showers and thunderstorms tomorrow, but these will be periodic throughout the day and relatively short-lived.
To better paint the picture of what is happening weather-wise, this map shows the areas of low pressure in the country. Currently, a low to our north (in Wisconsin) is providing all the showers and thunderstorms we will receive this afternoon. As we move into tomorrow, a low pressure system will be making its way northeastward from northeast Mexico. With it, we can expect more showers and thunderstorms the later half of Saturday, Saturday night, and Sunday. By the start of early next week we will clear allowing for the sunshine to return. Stay dry and be cautious if you plan to be out. If you can get through the rest of the dreary week, lots of sunshine and comfortable temperatures (in the mid 70's) will return for the first half of next week.