Prepare for possibly slippery and muddy mosh pits at Shaky Knees or an evening inside because some stormy weather is expected Saturday in Atlanta, even while feels-like temperatures will climb to triple digits.

The National Weather Service warns of a Level 1 of 5 risk for severe thunderstorms between 2 and 11 p.m. in North and parts of Middle Georgia. Heavy rain and frequent lightning are expected.

Increased moisture in the area will lead to scattered storms across the state, but areas under the Level 1 risk could see strong showers with damaging wind gusts of up to 60 mph, according to the agency. That zone includes Atlanta, north toward Dalton and Blairsville, and south toward Griffin and Columbus.

Those headed to Piedmont Park for the Shaky Knees music festival, which runs through Sunday, should be prepared for more potential showers and thunderstorms Sunday, when the Weather Service said storms could turn severe again. The festival is expected to draw at least 50,000 people over three days.

North Georgia is also dealing with unseasonably warm temperatures. Atlanta is predicted to reach a high of 94 degrees Saturday, and the NWS expects the heat index, which factors in humidity to measure the feels-like temperature, will climb to just above 100 degrees.

The Weather Service forecasts the heat index to rise again to the high 90s to mid-100s on Sunday.

If you’re attending Saturday’s Day 2 of Shaky Knees, consider wearing shoes you wouldn’t mind getting dirty and bringing a rain jacket. Dehydration is also a risk because of the high temperatures.

Isolated thunderstorms will become more widespread come Monday as a front approaches from the Mississippi River Valley, the NWS said. Rain chances will remain around 50% through Tuesday, before a ridge of high pressure shifts winds and cuts off moisture coming in from the Gulf.

Temperatures will turn more moderate by Wednesday, with highs in the high 80s to the low 90s, and then settle in the low to mid-80s by the end of the week. Overnight lows will also drop into the 60s Wednesday and Thursday.

“We’ll get a pleasant taste of fall,” the Weather Service said regarding lows toward the end of next week.

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