* WHAT...Hot conditions with afternoon high temperatures of 90 to 100 degrees. This will pose a moderate risk of heat-related illness.
* WHERE...In Oregon, Central Oregon, John Day Basin, Foothills of the Northern Blue Mountains of Oregon, and Grande Ronde Valley. In Washington, Yakima Valley, Lower Columbia Basin of Washington, and Foothills of the Blue Mountains of Washington.
* WHEN...Until 10 PM PDT this evening.
* IMPACTS...Hot temperatures may cause heat illnesses.