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 A low pressure system moves from the Rockies and into central Canada throughout the day. This system will push a strong cold front through the Plains, which will obtain moisture and energy from the Gulf of Mexico. Expect scattered showers and thunderstorms to develop along and ahead of this frontal boundary from the
upper Midwest and Great Lakes, through the mid-Mississippi River Valley and
southern Plains. These storms may turn severe with strong winds, large hail, and possibly a couple of tornadoes.
Behind this system, another trough of low pressure moves into the West Coast and pushes more moisture onshore. This will bring more rain showers and high-elevation snow showers to California and the Pacific Northwest. The Sierras will see another 3 to 6 inches of new snow on Friday. There is a slight chance of isolated thunderstorm development across California with strong winds and hail.
In the East, a large ridge of high pressure stretches from the Great Lakes, to the Gulf of Mexico, and eastward to the East Coast. This ridge will keep conditions dry and sunny for most of the
eastern U.S. Frost and freeze advisories will remain in effect for much of the region as overnight lows will dip into the lower 30s again, creating another chilly morning.
Temperatures in the Lower 48 states Thursday ranged from a morning low of 17 degrees at Silver Bay, Minn., to a high of 88 degrees at Edinburg, Texas.
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