Lightning strikes pepper the Oregon sky before the hot, humid air returns on Monday

Lightning strikes pepper the Oregon sky before the hot, humid air returns on Monday
Photo from the Oregon Dept. of Forestry details the lightning patterns over the last 24 hours.

EUGENE, Ore. -- Thunderstorms are expected to move across Northwest Oregon and Southwest Washington on Sunday, with strong cells dumping rain and hail in some areas.

Forecasters predict the region won't see a lot of rainfall from the storm, but rather heavy showers and hail from some pockets of the storm.  |  Current forecast

The National Weather Service reported 1/4-inch hail and lightning near Corvallis as early as 8:20 a.m. Sunday, with storms spread out across the Willamette Valley. Officials with the Oregon Country Fair said their 280-acre fairgrounds had some light showers in the morning as a storm passed through.

Thunder and lightning moved in on the Portland Metro area just before 1 p.m. Sunday, the NWS said.

The thunderstorms should die down as the sun sets.

Weather officials expect high pressure to build on Monday, bringing heat and humidity back to the region. A heat advisory is scheduled to go back into effect Monday at 11 a.m. 

NWS officials suggest people avoid the dangerous lightning storms with these tips:

- Immediately get off mountain ridges or peaks

- Never lie flat on the ground

- Never shelter under an isolated tree

- Never use a cliff or rocky overhang for shelter

- Immediately get out and away from lakes and other bodies of water