By Steven DuBois

Associated Press

PORTLAND — A major snowstorm spread Wednesday through Portland and parts of Washington state — toppling trees, closing schools and cutting power to thousands in the heaviest single storm snowfall for the city in years.

Some Portland neighborhoods got more than a foot of snow, a rare event in a city known for its rain.

Snow that started falling Tuesday was still coming down Wednesday morning and was expected to continue until the afternoon. The storm’s intensity surprised meteorologists, with most expecting no more than 4 inches.

“We are going to be analyzing this one, because this is a special one,” National Weather Service meteorologist Treena Jensen said.

The storm arrived in a Pacific Northwest winter that has been unusually cold, punctuated by several snow and ice storms. Portland has many homeless residents and four people have died of hypothermia since Jan. 1.

The snow began at the end of Tuesday’s rush-hour commute, so the roads were free of heavy traffic during the storm. Still, some vehicles jackknifed, spun out or were left abandoned by fearful drivers on Interstate 5 and other highways.

The Oregon Department of Transportation urged drivers to retrieve their vehicles Wednesday morning and free up space for snow plows and sanders. The agency also warned drivers to stay home, if possible.

“The timing of this was definitely fortuitous,” ODOT spokesman Don Hamilton said. “When these kinds of storms happen in the middle of the working day, at noon or 2 p.m., it can be very tricky.

He added: “But we still had a big rush of cars coming out at 8 or 9 o’clock, right when the storm was at its fiercest, and that’s where we had a lot of the problems.”

Snow didn’t hit Seattle, but southwestern Washington got socked. Clark County closed its non-essential government offices for the day.

In the central part of the state, the Grant County Sheriff’s Office warned motorists to stay off roads, saying snow drifts of 3 to 5 feet made them impassable.

Deputies were checking on stranded motorists, but calls for law enforcement services not deemed life-threatening were expected to take hours to resolve.

“There are just too many roads impacted to even begin to describe the impact areas,” sheriff’s spokesman Kyle Foreman said in a statement. “Deputies are advising motorists stuck in drifts to remain inside their vehicles, turn on their hazard lights and call for a tow truck.”

Schools throughout the region canceled classes and numerous government offices were closed.

Several large branches fell near Portland State University, and a large tree fell onto an academic building. Portland General Electric reported that more than 30,000 customers were without power on Wednesday.

Portland’s light-rail trains and streetcars were affected by frozen switches, downed trees and fallen power lines. Service was reduced and shuttle buses were needed. Portland International Airport was open, but some flights were canceled or delayed.

Though the snow began late in the day Tuesday, the National Weather Service said enough fell by midnight to make it the snowiest calendar day the Portland area since Dec. 20, 2008.

Temperatures were expected to remain at or near freezing before hitting 50 degrees early next week.

Weather service meteorologists said they are concerned about flooding when the temperatures rise.