Environment Canada has issued a tornado watch for Ottawa and much of the surrounding area.
Thunderstorms are moving into western NY now and will sweep east across central NY between 3 pm and 9 pm.
The tornado watch extends from Western New York into Central New York, as well as the North Country and Adirondacks.
"Severe thunderstorms with damaging winds, and possibly a couple of tornadoes, are expected this afternoon from the upper Ohio Valley to Pennsylvania and NY", the SPC wrote in its Tuesday outlook. Swaths of wind damage, some significant, will be possible.
Nickel- to quarter-sized hail is possible in areas hit by the strongest storms, according to the weather service.
Hurricane forecasters watching 3 spots in Atlantic, Harvey likely to restrengthen
We may get a few showers late in the week depending on the movement of Tropical Storm Harvey . Harvey fell apart on Saturday and is now just a tropical wave in the northwest Caribbean.
They likely diminish below severe levels shortly after sunset, but still contain gusty winds, heavy downpour, s and lightning when arriving in the Boston area around midnight.
However, embedded supercells within the line of storms could produce tornadoes as well.
The National Weather Service office in Burlington, Vermont, announced the tornado watch around midday.
If a warning gets issued, it means a threat is happening or is imminent and you should seek shelter immediately.