Election Day Forecast: Heavy rain, snow and record heat could impact voters

As millions of Americans head to the polls, thunderstorms are forecast from the Great Lakes to the Gulf Coast, with the potential to cause inconveniences for voters across the country.

The heaviest concentration of rain is expected in Wisconsin, Louisiana, East Texas and Arkansas, but heavy rains along the Mississippi River and Ohio River valleys could cause flash flooding and about 2 to 4 inches of rain between Louisiana and southern Indiana .

Meanwhile, heavy snow is forecast in the Rockies, from Montana to Colorado, and winter weather warnings have been issued in those regions.

In California, strong winds and dry conditions will threaten wildfires from the San Francisco Bay Area to Los Angeles, where a red flag warning has been issued.

Much of the eastern half of the US will experience unseasonably warm temperatures on Election Day.

Temperatures will be 10 to 25 degrees above normal, with record highs possible in cities such as Nashville, Tennessee; Louisville, KY; Indianapolis; Detroit; and Pittsburgh.