The nation’s weather

Weather Underground Forecast for Saturday, August 31, 2013.

Two weather features will bring active weather to the nation on Saturday. In the East, a low pressure system moves from the Great Lakes and into the Northeast, bringing scattered showers and thunderstorms with it. The system will create a cold front that stretches down the Eastern Valleys, triggering scattered storms over the Ohio River Valley, down the Appalachians, and moving toward the East Coast. Heaviest precipitation and strongest storms are likely across the Northeast from New York to Maine.

At the same time, another low pressure system moving eastward through central Canada will create a cold front that moves over the Dakotas and into the Upper Midwest. Warm and humid air to the south will feed in ahead of this cold front, allowing for scattered showers and thunderstorms to develop in these areas. There is a slight chance that these storms will turn severe with strong winds and periods of heavy rainfall from western South Dakota through Minnesota and into northern Iowa.

Out West, moisture over the desert Southwest will allow for more showers and thunderstorms to pop up across the Four Corners on Saturday. Flooding will remain of concern for these areas as dry deserts cannot easily absorb periods of heavy rainfall.

Temperatures in the Lower 48 states Friday have ranged from a morning low of 23 degrees at Tillamook, Ore. to a high of 104 degrees at Hugo, Okla.

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