* WHAT...Temperatures of 93 to 98 degrees F expected.
* WHERE...Central and Southern Willamette Valley, Northern and Central Coast Range Valleys and Mountains of Oregon, Foothills of the Northern and Central Oregon Cascades, Central Columbia River Gorge and the Hood River Valley, Willapa Hills and Adjacent River Valleys of Pacific and Wahkiakum Counties, Lower Columbia River and Cowlitz River Valleys, Outer Southeast Portland Metro, West Columbia River Gorge of Oregon above 500 ft, North Clark County Lowlands, and South Washington Cascade Foothills.
* WHEN...Until midnight PDT tonight.
* IMPACTS...Hot temperatures may cause heat illnesses.
* ADDITIONAL DETAILS...Today will be the hottest day of the week with temperatures cooling down on Tuesday.