The most active weather events were expected to develop across the Eastern and Central U.S. on Sunday due to fronts associated with a storm system over southeastern Canada.

In the East, light to moderate showers and scattered thunderstorms were forecast to develop ahead of a cold front moving through the Northeast. The heaviest amounts of precipitation were expected to fall across the northern New England states. Light showers and thunderstorms were also to fire up along the tail end of this front, which would extend through the Mid-Atlantic and into the Mid-Mississippi Valley.

Meanwhile, a nearly stationary front was expected to extend from the western half of the Mid-Mississippi Valley through the Central Plains. Westerly flow was forecast to enhance instability along this frontal boundary and instigate numerous clusters of thunderstorms throughout the Central Plains. Disturbances along the front were expected to create a chance for severe weather development throughout the afternoon. Forecasters said strong, damaging winds and hail might accompany thunderstorms in the Central Plains and the Ozarks.

In the West, a low pressure system located just off the Pacific Northwest Coast was to push onshore Sunday and trek toward the Northern Intermountain West. A cold front was expected to accompany the system, bringing scattered showers and thunderstorms to the Pacific Northwest. This system was also expected to enhance onshore flow across northern California, creating a chance for showers and a few rumbles of thunder throughout the day.

Elsewhere, high pressure was expected to remain over the South, yielding to another day of hot temperatures and mostly dry conditions across the Southwest and the Southern Plains. Another area of high pressure was to bring pleasant and dry weather to much of the Upper Great Lakes and the Ohio Valley.

Temperatures in the Lower 48 states Saturday ranged from a low of 36 degrees at Stanley, Idaho, to a high of 114 degrees at Goodyear, Ariz.

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On the Net:

Weather Underground: http://www.wunderground.com

National Weather Service: http://iwin.nws.noaa.gov

Intellicast: http://www.intellicast.com