The most significant rain in months will reach Portland, Salem and Eugene, Ore. beginning on Friday.
The storm moving in will be the first in a series of storms with rain and high country snow affecting a large part of the Northwest.
Initially, the pattern may seem like a dud, but as it gets going, it will turn progressively more soggy with time.
A general 0.25 to 0.50 of an inch of rain is forecast to fall through Saturday, with locally higher amounts on the Oregon coast and on the west slopes of the Cascades.
Additional storms with rain will follow Saturday night into early next week.
There is the potential for local amounts of 2.00 inches in the Portland area over the five-day period concluding next Tuesday.
Snow levels will remain well above the passes during the series of storms. However, hikers could get caught off guard in blinding snow and gusty winds with the events beginning the second half of the weekend into early next week. This is when the strongest storms and heaviest precipitation is likely to occur.
For Portland, the event(s) Friday into Saturday will be the most significant rainfall since at least the middle of July. The entire event may rival some of the lingering storms from the spring.
While the Cascades will filter out a great deal of the moisture upon moving eastward, some showers are forecast to reach the The Dalles and Pendleton, Ore., areas as well.
Following a dip in temperature during the middle of the week, summerlike warmth will rebound across much of the Northeast by this weekend.
Daily episodes of severe thunderstorms and flooding downpours will impact the Plains this week, possibly lingering into the weekend.
The central and southern Plains will continue to be pummeled by strong storms for the next several days, but the most potent severe weather threat is likely to be during the Mother's Day weekend.
Wind, seas and surf will build in advance of what is likely to become the first tropical system of 2015 along the southeastern Atlantic coast of the United States late this week.
Summer will lack any long-lasting heat waves across northwestern Europe, while parts of southern and eastern Europe will feel the heat.
Powerful thunderstorms unleashed damaging winds, hail and tornadoes from Netherlands into Germany.
Lakehurst, NJ (1937)
Hindenburg disaster after 4-hour delay of landing due to a thunderstorm.
Omaha, NE (1975)
Massive tornado killed 3 people and injured 133 while causing 150 million dollars worth of damage. Tornado cut a swath 10 miles long and one-quarter of a mile wide through the industrial and residential areas of west-central Omaha before lifting over the northern section of the city. Most costly U.S. tornado to date.
Thunderstorms rake over Nebraska and Kansas with golf ball-sized hail, wind gusts close to 90 mph at Superior, NE, and 3-1/2 inches of rain at Kensaw, NE.