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[May 31, 2011] (AP) A low pressure system that brought late season snowfall to the northern and central Rockies will take a more northeastward turn Tuesday, moving into central Canada.

However, flow around this system will continue pushing warm and moist air northward from the Gulf of Mexico, creating a strong warm front that will stretch eastward north of the Great Lakes. This will produce severe storms over Ontario and Quebec.

Meanwhile, the system will also continue dragging a cold front through the U.S. The front will start the day over the Plains and reach over the upper Midwest and into the Great Lakes by evening. Expect scattered showers and thunderstorms to develop along this front, with severe storms developing in the afternoon and evening hours. Heavy rainfall, large hail and strong winds are likely in areas of severe storm development. Environmental conditions may allow for a few tornadoes to develop Tuesday afternoon as well.

To the south, the tail end of the cold front will extend into the southern Plains. The system will gain energy from warm and moist flow from the Gulf of Mexico. Thus, a few scattered showers and thunderstorms will pop up across Oklahoma and Texas.

Out West, a low pressure system spinning offshore of the West Coast will push a cold front onshore. This front will kick up widespread rain showers across the Pacific Northwest and northern California. Cool temperatures will persist across the West Coast.

Temperatures in the Lower 48 states Monday ranged from a morning low of 23 degrees at Big Bear City, Calif., to a high of 104 degrees at Laredo, Texas.

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[Associated Press article from Weather Underground]