A tornado warning has been issued for Savant Lake and Sturgeon Lake in northwestern Ontario. Here's the latest from Environment and Climate Change Canada on how to stay safe.

People in the warning area are urged to seek immediate shelter inside a sturdy building and to stay away from windows in case a tornado touches down.

This means that instead of receiving a tornado warning just 15 minutes before a storm strikes, residents could get up to two hours’ notice. The technology also allows for more targeted alerts, potentially narrowing warnings from entire regions to just one or two counties.

A tornado warning has been issued for parts of Ocean County in New Jersey until 11:30 p.m. Parts of Atlantic County were also originally included in the warning, but the warning has expired there. The National Weather Service said a severe thunderstorm capable of producing a tornado was located northeast of Atlantic City at 11:16 p.m.

A tornado warning has been issued for Washington DC and surrounding areas, with the National Weather Service urging residents to take shelter as severe storms bring the threat of dangerous winds and flash flooding.

The storm traveling east has already resulted in an evacuation order from the Harley-Davidson festival on Milwaukee's lakefront.

An updated tornado warning was issued by the National Weather Service on Tuesday at 5:52 p.m. in effect until 6:30 p.m. for Bucks, Montgomery and Philadelphia counties.

A flash flood warning was issued by the National Weather Service for the following: Berks, until 8:15 p.m., Chester, Delaware and Montgomery counties, until 9:45 p.m. and Bucks, until 10 p.m. Tuesday.

People in the warning area are urged to seek immediate shelter inside a sturdy building and to stay away from windows in case a tornado touches down.