Weather threatens Macy’s Thanksgiving Day Parade

Wind gusts of 35 mph could prevent the parade's large balloons from being marched across Manhattan.
1:42 | 11/28/19

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Transcript for Weather threatens Macy’s Thanksgiving Day Parade
The giant balloons for the Macy's Thanksgiving parade could be grounded. Crews right now inflating the balloons, hoping they'll make the trip down the parade route police calling it a game-day decision. Here's ABC's gio Benitez. Reporter: Tonight, America's most famous balloons are being inflated. But the big question now -- will they fly? We'll make a gameday decision regarding the heights of the balloons. Reporter: The forecast calls for strong winds. And the rules in place say the 16 large character balloons can't fly if sustained winds exceed 23 miles per hour and the gusts are stronger than 34 miles back in 1997, the iconic cat in the hat balloon got caught up in strong winds and hit a lamp four people before injured, including a woman who was in a coma for nearly a month. That incident launching these restrictions. Tomorrow, the NYPD will be measuring the winds along the parade route, making the call right before the parade starts. At the end of the day, public safety is paramount and we want everybody to enjoy the event. Reporter: The balloons can go up as high as 55 feet, as low as ten feet. Or if the winds are too tough, grounded altogether. All right, gio joins us now live from the parade route. We can see the balloons right there behind you. And gio, this is a big unknown. The decision to ground those balloons could be made before the parade and even during it? Reporter: That's right, Tom. It could actually be made at any moment tomorrow. Now, thousands of officers, they're going to be out here tomorrow along that parade route and a whole lot of spectators, we're talking about more than 3 million people expected at this parade tomorrow. That's just an incredible number, Tom. So many hoping those balloons do fly. All right, gio, thank you.

This transcript has been automatically generated and may not be 100% accurate.

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