National Weather Summary for September 30,2013 from weatherunderground.com

Weather Underground midday recap for Monday,September 30,2013.

Moderate to heavy rain continued to batter down the Pacific Northwest on Monday, while a ridge of high pressure kept conditions pretty dry along the East Coast.

A slow moving cold front trekked through the Pacific Northwest and into the northern Rockies earlier today, as flash flood warnings were issued in Washington and Oregon. Due to how slow this system moved through the Northwest, rivers and streams became quite vulnerable to flooding. Heavy snow fell along elevated terrain, while western facing slopes in the Cascades and the northern Rockies experienced the heaviest snow. Rain also fell in parts of Idaho, Montana, Wyoming, Utah, Nevada, and California as a result of this cold front boundary. Strong winds accompanied the front, especially in the mountains. Meanwhile to the south, a ridge of high pressure continued to build over the four corners states. This provided warm, dry weather to much of the Great Basin and Southwest. To the east, a weakened stationary front inched over the southeast Plains and the Ohio River Valley as spotty thunderstorms formed over eastern Texas and Louisiana. The remainder of the Plains stayed relatively dry on Monday.

The Southeast, including the Florida panhandle, Alabama, and Georgia, also experienced spotty thunderstorms due to an onshore flow off of the Gulf of Mexico. The remainder of the East Coast experienced cool, dry conditions on Monday as a ridge of high pressure continued to build over the Mid-Atlantic States.