Excessive Heat — South Central Siskiyou County, California

2021-06-26 to 2021-06-30 · South Central Siskiyou County, California

Event narrative

On 06/26/21, the reported low temperatures in this zone ranged from 55 to 58 degrees and the high temperatures ranged from 96 to 100 degrees. On 06/27/21, the reported low temperatures in this zone ranged from 62 to 63 degrees and the high temperatures ranged from 103 to 105 degrees. On 06/28/21, the reported low temperatures in this zone ranged from 51 to 61 degrees and the high temperatures ranged from 100 to 101 degrees. On 06/29/21, the reported low temperatures in this zone ranged from 55 to 57 degrees and the high temperatures ranged from 99 to 101 degrees. On 06/30/21, the reported low temperatures in this zone ranged from 56 to 59 degrees and the high temperatures ranged from 96 to 98 degrees. On 06/28/21, Mount Shasta City set a record for the highest temperature in June with a reading of 103 degrees. The old record was 99 degrees, set on 06/20/2021.

Wider weather episode

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 northern California.

Source: NOAA Storm Events Database, event_id 958276. Narrative written by the NWS forecast office that issued the report.