Heavy Rain for Ontario....

A stubborn upper level low will rotate throughout the Great Lakes this weekend - very slowly. As a result a cold rain with embedded thunderstorms will dump 30-50mm of rain from Windsor to Montreal through Saturday. Gusty southwest winds will reach speeds of 60km/h near the Great Lakes. It will be nasty and cool along much of the eastern coastline. Further south heavy thunderstorms will stretch from Texas to the Carolinas.

http://www.weatheroffice.ec.gc.ca/warnings/SWS_bulletins_e.html?prov=on