Excessive Heat in Lower Columbia Basin, Oregon

Calculated heat risk values at the KHRI ASOS recorded consecutive days between June 27th through June 30th of temperatures that met or exceeded excessive heat warning criteria. Calculated heat risk values at the Boardman, OR GHCN station recorded consecutive days between June 26th through July 1st of temperatures that met or exceeded excessive heat warning criteria. Many CWOP stations and the ASOS at KHRI recorded consecutive days of temperatures over 110, while the highest recorded temperature was 118 at KHRI on June 29th.

A strong upper level ridge of high pressure and a surface thermal trough brought several days of record high temperatures across the PacNW, with many locations in the lower and higher elevations experiencing extreme heat risk during this event. The multiple days of extreme heat risk has been attributed to several fatalities across the region.