Excessive Heat in Foothills of the Northern Blue Mountains of Oregon, Oregon

Calculated heat risk values at the Pendleton WFO recorded consecutive days between June 27th through June 30th of temperatures that met or exceeded excessive heat warning criteria. Calculated heat risk at the Milton Freewater, OR GHCN station recorded consecutive days between June 25th through July 1st of temperatures that met or exceeded excessive heat warning criteria. The highest recorded temperature in the zone was 117 degrees recorded at the KPDT ASOS site 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.