July 19, 2012: The nation's weather

Weather Underground Forecast for Thursday, July 19, 2012.

Active weather will continue in the East on Thursday as a trough of low pressure in Quebec Canada pushes a cold front southward across Lower New England and the Upper Mid-Atlantic. Expect showers, periods of heavy rain and thunderstorms to form along and ahead of this frontal boundary as it meets with hot and humid conditions, while a cooling trend begins in Upper New England. Meanwhile, a frontal system will stall across the Ohio and Mid-Mississippi Valleys with rain and thunderstorms. Areas from eastern Illinois into Ohio and Kentucky are at slight risk of severe thunderstorm development with damaging wind and hail events.

To the south, hot and humid conditions will maintain areas of generally scattered showers and thunderstorms in the southeastern quadrant of the nation, while moisture streaming in from the gulf of Mexico kicks up showers and thunderstorms in southwestern Texas and the Southern Rockies.

Finally, a few showers are possible near the southern California coast, while chances of showers persist in the Northwest. Temperatures in the Lower 48 states Wednesday have ranged from a morning low of 37 degrees at Stanley, Idaho to a high of 107 degrees at Maryland Science Center, Md.