Extreme Heat Warning

* WHAT...Dangerously hot conditions with temperatures of 95 to 99 degrees F expected.

* WHERE...Portland Metro Lowlands, Western Columbia River Gorge, Portland West Hills and Chehalem Mountain, Inner Vancouver Metro, and East Clark County Lowlands.

* WHEN...From 11 AM Sunday to 11 PM PDT Tuesday.

* IMPACTS...Heat related illnesses increase significantly during extreme heat events.

* ADDITIONAL DETAILS...Peak heating days will be Sunday and Monday with a slight cool down on Tuesday. Overnight temperatures will remain elevated Sunday night into Monday morning, and Monday night into Tuesday morning. Night time temperatures ranging from 63 to 67 degrees F will lead to poor overnight relief. There is currently a 15-30% chance that night time temperatures remain above 70 degrees F Sunday night into Monday morning, and less than a 10% chance Monday night into Tuesday morning. There is a 30-40% chance of high temperatures of 100 degrees F or more on Monday.