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[August 21, 2010] (AP) A low pressure system in the North was expected to continue spreading scattered storms over the Midwest on Saturday.

(Click on map for larger image.)

Th Hardware e system was forecast to continue pushing a strong frontal boundary through the Great Lakes as it tracks northeastward and into northeastern Canada.

A warm front was expected to lead the system, moving over Michigan and into the Ohio River Valley, as a cold front moved through the mid-Mississippi River Valley. The combination could trigger scattered showers and thunderstorms over America's heartland, and the storms could turn severe as ample moisture feeds the system from the South. Heavy rains, large hail, strong winds and possibly tornadoes were expected.

The tail end of the front was expected to extend westward into the southern Plains and could relieve the region from hot and humid conditions. However, high temperatures near 100 with heat indexes above 110 degrees were forecast for most of the southern and central Plains.

In the East, high pressure could start to shove off the East Coast as the low pressure system moves in from the Midwest. Increasingly cloudy skies over the Northeast and New England were expected, along with high temperatures in the 80s.

The Southeast and Mid-Atlantic states were expected to see more scattered showers as a weak stationary front slowly moved offshore.

The West Coast could see a relatively unchanged weather pattern with a trough sitting just offshore, pushing moisture and clouds along the coasts.

The Southwest was expected to remain sunny, hot and dry with dangerous fire weather conditions.

On Friday, temperatures in the Lower 48 states ranged from a low of 30 degrees at Stanley, Idaho, to a high of 107 degrees at Needles, Calif.

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[Associated Press article from Weather Underground]