WASHINGTON — Government forecasters say a big storm that they’re calling “Frankenstorm” is likely to blast most of the U.S. East Coast next week.

Its effects will be felt in Butler County.

The storm is an unusual mix of a hurricane and a winter storm. The worst of it could be focused around New York City and New Jersey.

Forecasters today said there’s a 90 percent chance that the East will get steady gale-force winds, flooding, heavy rain and maybe snow starting Sunday and stretching past Wednesday.

The hurricane part of the storm is likely to come ashore somewhere in New Jersey on Tuesday morning.

NOAA forecaster Jim Cisco said the storm is so massive that the effects will be felt along the entire coast from Florida to Maine and inland to Ohio.