This year’s Atlantic hurricane season is expected to be extremely active, putting tens of millions of Americans in the eastern half of the country at risk from flooding and damaging winds, forecasters at the National Hurricane Center warn, Report informs referring to NPR.

The increased activity is partially caused by abnormally warm ocean temperatures driven by climate change.

Forecasters expect 17 to 25 storms to form in the Atlantic between June 1 and the end of November. At least 8 of those are forecast to be full-blown hurricanes, as opposed to weaker tropical storms. And 4 to 7 are expected to be major hurricanes, with winds powerful enough to uproot trees, destroy mobile homes and damage other buildings.

It’s the largest number of storms ever forecast for the Atlantic, and is well above the average of 14 storms that usually occur in a given hurricane season.