Tens of millions of people are about to hit the road and head home after the Labor Day holiday weekend, but some of those trips could see delays as more rounds of relentless rain and thunderstorms are increasing the flood threat across portions of the Plains, as well as in Florida .

Labor Day is often seen as the last official weekend of summer , making the transition from hot days to the first hints of a fall -like feel. In fact, some parts of the Upper Midwest have already seen their first Frost Advisories , and trees are even starting to change colors in Alaska .

HOW TO WATCH FOX WEATHER

Below-average temperatures will persist across a large chunk of the U.S. , but where temperatures aren’t making headlines, a flash flood threat will persist.

Moisture levels are expected to remain h

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