Severe Thunderstorms Expected in Pacific Northwest This Afternoon

PORTLAND, Ore. — Strong and severe thunderstorms are anticipated across western Oregon and Washington this afternoon, raising concerns among meteorologists about the potential for hazardous weather. According to the Storm Prediction Center, the risk of hail and tornadoes has increased significantly, prompting a Severe Thunderstorm Watch for the region.

“This could be an extraordinary day for us,” said Storm Tracker 2 Meteorologist Rhonda Shelby. “We don’t usually see this enhanced possibility of large hail.” The watch is in effect until 9 p.m. PDT and encompasses major areas, including the Interstate 5 corridor.

At 1:30 p.m. on Wednesday, the Storm Prediction Center issued its first mesoscale discussion regarding the risks presented by the storms. They noted the possibility for supercell development, which can lead to large hail, isolated severe gusts, and potentially a tornado or two.

“Supercell development is possible later this afternoon,” the agency stated, placing the probability of a Severe Thunderstorm Watch at 80%. “Hail should be common with this activity, and the strongest updrafts may generate hailstones exceeding golf ball size.”

The storms are forecasted to develop in the southern Willamette Valley in the early afternoon before moving north, with expectations that they will reach the Portland area just in time for the evening commute.

If large hail forms, it may cause damage to vehicles, homes, and agricultural crops. In light of this forecast, the Oregon Office of Emergency Management is urging residents to remain vigilant and have a preparedness plan in place.

In a historical context, the National Weather Service noted that this marks the first time since 2002 that a Level 2 Sligh risk has been issued in March for areas west of the Rockies.

Residents are encouraged to monitor local weather alerts through various channels, including NOAA Weather Radio and weather apps. Heavy rain, hail, damaging winds, and even tornadoes are significant threats leading into the evening.

While most residents will likely face heavy downpours and gusty winds, meteorologists stress that the hail and isolated tornado threat remain crucial factors to communicate effectively. The SPC has identified most of the I-5 corridor, particularly in Seattle, Tacoma, and Portland, as areas with the greatest potential for damaging hail.

As the severe weather continues to develop, no major tornado outbreaks are expected, given the historical rarity of such events in the Northwest. However, the inclusion of communities in severe watch zones marks a notable meteorological occurrence.

The potential for damaging winds with gusts reaching 58 mph also heightens the risk of power outages this afternoon and evening. Residents are advised to prepare for possible changes in their power status.

As the day progresses, meteorologists predict that once the cold front has passed, the threat of severe weather will diminish. However, after midnight, the chance of thunderstorms will continue, albeit with less intensity.

Forecasters will remain active throughout the day, with updates available on KATU.com and local news broadcasts at various times.