Excessive Heat in Modoc County, California

On 07/20/24, reported low temperatures in this zone ranged from 52 to 68 degrees. Reported high temperatures ranged from 93 to 103 degrees. On 07/21/24, reported low temperatures ranged from 55 to 73 degrees. Reported high temperatures ranged from 91 to 100 degrees. On 07/22/24, reported low temperatures ranged from 54 to 71 degrees. Reported high temperatures ranged from 91 to 100 degrees. On 07/23/24, reported low temperatures ranged from 54 to 68 degrees. Reported high temperatures ranged from 92 to 100 degrees. On 7/20, a record high was set at Alturas of 103 degrees.

A persistent ridge over the western states with an associated thermal trough extending from northern California into southern Oregon brought a long-duration heat wave. Excessive heat conditions on 7/24 were limited to the Shasta Valley in central Siskiyou County.