Excessive Heat — Lower Columbia Basin, Oregon

2021-06-26 to 2021-06-30 · Lower Columbia Basin, Oregon

Event narrative

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.

Wider weather episode

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.

Source: NOAA Storm Events Database, event_id 969144. Narrative written by the NWS forecast office that issued the report.