The latest in a series of drenching storms will blow in from the Pacific Ocean and can bring 0.50 to 1.00 inch of rain to the Portland, Ore., area.
The bulk of the rain will fall during Monday afternoon and the first half of Monday night, when the rain can be heavy enough to cause brief urban flooding problems and slow travel for a time.
Winds will not be especially strong in most areas, with gusts generally under 30 mph, but can briefly more powerful over the passes and in the mountains of Washington.
Snow levels will be very high, well above pass levels with the storm.
Showers will linger in the wake of the storm during Tuesday. However, the sun could break through briefly later in the day.
High pressure will move Wednesday into Thursday with generally rain-free conditions and some sunshine.
Another system with rain is forecast to affect the area Thursday night into Friday. Chilly air and showers may linger over the weekend.
Rain over the weekend brought a general 0.25 to 0.50 of an inch to Portland over the weekend. An inch of rain fell on portions of the Oregon and southern Washington coasts.
Showers and thunderstorms will return to the Southwest late this week and could reach part of California.
The late-season swelter will continue along much of the Atlantic Seaboard through the week as tens of millions head back to school and work.
An area of low pressure will bring a threat of heavy rain and flooding to parts of southern Europe through the middle of the week.
Life-threatening flash flooding and mudslides will occur across northeastern Mexico as Dolly moves inland.
Following a warm, humid start for the first days of September, lower humidity and more pleasant conditions will return to the Pittsburgh area.
A cold front swinging into the Northeast will bring the threat of severe weather to part of the region on Tuesday afternoon.
Tampa, FL (1935)
The "Labor Day" hurricane hit Tampa, killing 400 people. Earlier, this intense storm had a center barometric pressure of 26.35 inches - the lowest recorded sea level pressure in the Western Hemisphere.
Denver, CO (1961)
Earliest snow on record; a total of 4.2 inches. A great storm raged at high elevations with 2-3 feet of snow closing roads on Labor Day weekend.
Coffeyville, KS (1970)
Hailstone 17.5/44 cm in circumference 1.671 lb/757 gm.