Excessive Heat in John Day Basin, Oregon

Calculated heat risk values at a GHCN at the site 35 WNW of John Day, OR recorded consecutive days between June 26th through June 29th of temperatures that met or exceeded excessive heat warning criteria. Several locations including a USCRN and CWOP stations recorded consecutive daily highs over 105 degrees, with a CWOP station recording consecutive daily highs at or above 110 degrees.

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.