Weather Underground Forecast for Friday, April 20, 2012.
Multiple weather systems will allow for active weather to persist across most of the nation on Friday. A strong low pressure system will continue moving eastward from the Upper Midwest and into the Great Lakes. Counter-clockwise flow around this system will continue pulling warm and moist air in from the Gulf of Mexico, pushing a strong warm front through the Great Lakes and into the Northeast. Expect moderate to heavy showers and thunderstorms to develop along and ahead of this system, with snow possible across the Upper Peninsula of Michigan. Meanwhile to the south, a cold front extends southward from this system and moves through the Southern Plains, into the Lower Mississippi River Valley. Thunderstorms will develop along this frontal boundary, with severe thunderstorms possible from the Ohio River Valley and into Texas. Strongest storms with heavy rainfall, strong winds, and large hail are most likely to develop in eastern Texas.
In the West, a trough of low pressure moves over the Pacific Northwest and Intermountain West, into the Northern Rockies by evening. This will support more rain showers and high elevation snow showers across the Northwestern US. California and the Southwest will remain warm and dry as high pressure remains the dominant weather feature. Temperatures in the Lower 48 states Thursday have ranged from a morning low of 21 degrees at Crane Lake, Minn. to a high of 93 degrees at Fort Stockton, Texas