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Winds to Factor Into Wallenda's Tightrope Stunt Over the Chicago River

Winds may add more drama to Nik Wallenda's tightrope attempt high above the Chicago River on Sunday evening.

While winds on Sunday will not be quite as strong as the howling wind on Halloween, gusts will start to increase in the evening hours. The walk is scheduled to take place at 6 p.m. CST.

The tightrope is the width of a nickel and will be stretched 50 stories, or 500 feet, up in the air, according to CBS Chicago. The walk will traverse the length of two city blocks with an uphill angle of 15 degrees. It starts atop Marina City and ends on the roof of the Leo Burnett Building.

Wallenda will be facing into the wind as he ventures out over the Chicago River for the first part of the feat. Winds at street level are forecast to blow from the south-southwest, gusting between 10 and 20 mph.

"Wind gusts may become enhanced as they funnel between the buildings as he first emerges out over the Chicago River," AccuWeather Senior Meteorologist Alex Sosnowski said. "Winds could be significantly higher 500 feet up, with gusts of up to 30 mph."

The second part of his walk is scheduled to take place between the west and east Marina City towers, and Wallenda will be blindfolded.

Besides wind, it will also be chilly. Temperatures are expected to be about 5 degrees below average on Sunday, topping out in the upper 40s during the afternoon. At the time of Wallenda's stunt, the temperature will be dropping through the mid- to low 40s.

Story by AccuWeather Meteorologist Becky Elliott