Excessive Heat in Siskiyou Mountains & Southern Oregon Cascades, Oregon

Howard Prairie was the only station from this zone that reported observations. On 06/26/21, the low temperature was 47 degrees and the high temperature was 89 degrees. On 06/27/21, the low temperature was 49 degrees and the high temperature was 96 degrees. On 06/28/21, the low temperature was 59 degrees and the high temperature was 100 degrees. On 06/29/21, the low temperature was 56 degrees and the high temperature was 94 degrees.

A historic heat wave affected the Pacific Northwest during this interval. It was caused by a strong upper level ridge that created dry and stable conditions over the area with strong subsidence. Many daily, monthly, and all-time high temperature records were set over southwest and south central Oregon.