Live updates: Many communities in the Philadelphia region alter July 4th plans due to heat wave

Officials in Marple Township, Pennsylvania announced Thursday they have changed the route for the July 4th parade due to extreme heat in the forecast.

The parade will now begin at Radnor Drive instead of Saint Albans Avenue.

It will conclude at Malin Road.

In addition, the Firecracker 5k will now start at 9 a.m. at Malin Road and West Chester Pike.

Officials remind residents in attendance to be sure to hydrate and plan accordingly,

Temporary road closures and traffic delays along the parade route can also be expected.

Skippack Twp. in Montgomery County has canceled its annual 4th of July parade due to dangerous heat in the forecast.

Township officials made the announcement on their Facebook page.

"The safety of our community is always our first priority and we want to thank everyone for their understanding," they said in the post.

Organizers have canceled Philadelphia's Salute to Independence Semiquincentennial Parade that was set to take place on Friday.

Wawa Welcome America made the announcement on social media just hours before the parade.

The event was canceled as the city expects to hit heat index values, once again, between 105-112 degrees, or even higher. The dangerous heat already tied a 103-degree record on Thursday.

This year, the route was supposed to be expanded, but was already cut short due to the heat. It was set to take the floats, 42 marching bands, and other performers down the parkway to Logan Circle.

"The reality is that Mother Nature is Mother Nature," Todd Marcocci, the parade producer, told Action News.

Extreme heat is forcing many event cancellations, including Philadelphia's Salute to Independence parade.

Dozens of train enthusiasts gathering in Berks County to catch a glimpse of a historic locomotive were overcome by the extreme heat Thursday as temperatures soared across the region.

Chopper 6 was overhead at Reading Outer Station along Pottsville Pike in Muhlenberg Township, where authorities say first responders treated more than 100 people for heat-related injuries.

More than 35 treated as heat overwhelms crowd gathering to see historic locomotive 'Big Boy'

"Multiple people began collapsing from what appeared to be mostly heat-related medical episodes. Infants several months old to the elderly began to experience heat-related symptoms. On scene medical personnel immediately became overwhelmed with the number of patients," said Muhlenberg Township Police Chief Randall Hoover.

One person went into cardiac arrest and was revived at the scene, officials said.

According to Hoover, 35 people needed to be taken to an area hospital for further evaluation