The Nation's Weather 10.05.09

By WEATHER UNDERGROUND (AP)

A large, winter-like storm was expected to trek through the Intermountain West on Monday, while the Southeast should see more rain and possible flooding in some areas.

The western weather system is expected to remain fairly strong through the day, producing significant snowfall and low elevation rain with clusters of thunderstorms during its eastward movement through the Great Basin, across the Rockies and into the Central and Northern High Plains. A colder airmass should trail the system and keep temperatures well below seasonal averages.

As the system shifts eastward, northern California and areas of the Pacific Northwest should begin to see a warming trend. Daytime temperatures are expected to return to near normal through mid-week. Meanwhile, a cold, developing area of low pressure is expected to keep southern California under fairly chilly weather.

In the Southeast, a wave of low pressure along a Gulf Coast frontal boundary is predicted to kick up moderate showers with locally heavy rainfall and isolated thunderstorms in the Southeast and the Tennessee Valley. Excessive rainfall may cause flooding throughout the day in some areas. Additional precipitation and thunderstorms are also expected along the coast of Louisiana.

In the North, a few showers are expected to linger in the Great Lakes and the Northeast while low pressure in the Great Lakes should move into southeastern Canada.

Temperatures in the Lower 48 states Sunday ranged from a low of 18 degrees at Burns, Ore. to a high of 97 degrees at McAllen, Texas.