WEATHER-TRAFFIC UPDATE: Isolated downpours develop in Gwinnett as Perimeter problems pop up

Atlanta’s 20 percent chance of rain Tuesday afternoon is coming to fruition, with isolated downpours moving through Gwinnett County, according to Channel 2 Action News.

The rain isn't widespread, but it's enough to leave I-85 slick. The WSB 24-hour Traffic Center. doesn't report any major wrecks on the interstate, but northbound delays are tough between the Perimeter and Beaver Ruin Road.

A crash on the Perimeter’s outer loop has three left lanes blocked at I-75 in Cobb County, the Traffic Center reported. That has traffic gridlocked past Ga. 400.

Another crash in Cobb has two right lanes of the inner loop blocked at Cobb Parkway, according to the Traffic Center. Delays span back to U.S. 78.

Two gas leaks are also causing problems.

About 100 people were evacuated from the Barge Road Highrise as a precaution, Atlanta fire spokesman Sgt. Cortez Stafford told AJC.com. Barge Road remains closed as Atlanta Gas Light crews make repairs.

MORE: Atlanta assisted living facility evacuated after gas leak

In Gwinnett, a gas leak has shut down the intersection of Spring Gate Drive and Webb Gin House Road, the fire department said in a news release. No evacuations were required.

Tuesday’s mostly dry conditions are a marked change from Monday, when the Northside and the mountains got drenched with downpours. Channel 2 meteorologist Brian Monahan said the afternoon showers should subside soon, leaving Atlanta dry tonight.

Atlanta topped the predicted high of 84 degrees by reaching 85 just after 5 p.m.

A big drop in temperatures is coming for Wednesday morning.

Monahan said a gusty northwest wind will usher in air more typical of early springtime or fall, keeping temps unseasonably cool Wednesday from metro Atlanta to the east.

“We're going to have a lot of spots in the 60s to around 70 degrees during the afternoon,” he said. “That’s going to be a shock to the system. You might even need a light jacket around tomorrow afternoon in parts of the area.”

By the weekend, Monahan said temps are swinging back into the upper 80s. Rain chances are coming down, however. A 40 percent chance Wednesday drops to 10 percent Thursday and stays nil through Saturday, according to the latest forecast.