The East will see another chilly day, while scattered showers move into the Midwest and Great Lakes on Sunday.
A low pressure trough is strengthening as it moves over the Plains and pulls moisture in from the Gulf of Mexico. This will cause scattered showers to develop over the upper Midwest and Great Lakes. Severe storms are not likely, but some areas could see strong, damaging winds.
Meanwhile, the southern edge of high system will become stronger as warm and humid air moves in from the Gulf. Scattered showers and thunderstorms will develop over the Southern Plains and move into the Lower Mississippi River Valley by Sunday evening. Some of these storms will turn severe with strong winds, large hail, and heavy rainfall possible.
In the East, a ridge of high pressure will begin advancing eastward along the Eastern Seaboard. This system will continue bringing in cool air from Canada with highs in the 50s and 60s. Frost and freeze advisories will remain in effect from the Northeast and New England, through the mid-Atlantic states as overnight lows will dip into the 30s and 40s.
Out West, the Pacific Northwest will see another wet day as a low pressure system to the west continues pushing multiple waves of low pressure onshore. This will trigger more scattered rain showers with high-elevation snow showers for the Cascades.
The Southwest and California will remain sunny and warm as a high pressure area dominates that region. Temperatures in the lower 48 states ranged Saturday from a morning low of 19 degrees at Alamosa, Colo., to a high of 93 degrees at Palm Springs, Calif.
Weather Underground: http://www.wunderground.com
National Weather Service: http://iwin.nws.noaa.gov