High pressure originating from the four-corners region built westward into California resulting in very hot daytime temperatures and warm overnight low temperatures across interior Northern California. High to very high heat risk impacted the region with a several day heatwave. One daily high temperature record was tied and one daily high temperature record was broken. During the event, cooling centers were made available to the public across interior Northern California.

Excessive Heat in SHASTA LAKE/NORTH SHASTA COUNTY, CALIFORNIA
From 09-JUL-21 14:00:00 to 12-JUL-21 18:12:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Lake Shasta Dam saw high temperatures reach 107 to 112 degrees during the event.

Excessive Heat in BURNEY BASIN/EASTERN SHASTA COUNTY, CALIFORNIA
From 09-JUL-21 14:00:00 to 12-JUL-21 18:12:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The Burney Basin region saw high temperatures reach 102 to 107 degrees during the event.

Excessive Heat in NORTHERN SACRAMENTO VALLEY, CALIFORNIA
From 09-JUL-21 14:00:00 to 12-JUL-21 18:12:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The Northern Sacramento Valley saw high temperatures reach in excess of 110 degrees, with Redding airport reaching 114 degrees during the event. On July 10th, Red Bluff recorded a daily record high minimum temperatures of 77 degrees.

Excessive Heat in CENTRAL SACRAMENTO VALLEY, CALIFORNIA
From 09-JUL-21 14:00:00 to 12-JUL-21 18:12:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The Central Sacramento Valley region saw high temperatures reach upwards of 111 degrees during the event. On July 10th, Marysville recorded a high temperature of 111 degrees.

Excessive Heat in NORTHERN SAN JOAQUIN VALLEY, CALIFORNIA
From 09-JUL-21 14:00:00 to 12-JUL-21 18:52:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The Northern San Joaquin Valley saw high temperatures reach 105 to 113 degrees during the event.

Excessive Heat in SOUTHERN SACRAMENTO VALLEY, CALIFORNIA
From 09-JUL-21 14:00:00 to 11-JUL-21 21:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The Sacramento region saw high temperatures reach in excess of 110 degrees on the 9th and 10th. On the 9th, downtown Sacramento tied its daily high temperature record of 109 degrees and on July 10th set a new daily high temperature record of 113 degrees.

Excessive Heat in CARQUINEZ STRAIT AND DELTA, CALIFORNIA
From 09-JUL-21 14:00:00 to 10-JUL-21 21:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The Delta regions saw high temperatures reach upwards of 105 to 107 degrees on the 9th and 10th.

Excessive Heat in MOUNTAINS SOUTHWESTERN SHASTA COUNTY TO WESTERN COLUSA COUNTY, CALIFORNIA
From 09-JUL-21 14:00:00 to 12-JUL-21 18:52:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The western foothills of the Sacramento Valley saw high temperatures reach upwards of 107 to 112 degrees during the event.

Excessive Heat in NORTHEAST FOOTHILLS/SACRAMENTO VALLEY, CALIFORNIA
From 09-JUL-21 14:00:00 to 12-JUL-21 18:52:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The north eastern foothills of the Sacramento Valley saw high temperatures reach upwards of 104 to 109 degrees during the event.

Excessive Heat in MT SHASTA/WESTERN PLUMAS COUNTY, CALIFORNIA
From 09-JUL-21 14:00:00 to 12-JUL-21 18:52:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Portions of the region saw high temperatures reach upwards of 104 to 110 degrees during the event.

Excessive Heat in MOTHERLODE/CAMPTONVILLE TO GROVELAND, CALIFORNIA
From 09-JUL-21 14:00:00 to 12-JUL-21 18:52:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The Motherlode region saw high temperatures reach upwards of 104 to 110 degrees during the event.

Excessive Heat in WEST SLOPE NORTHERN SIERRA NEVADA, CALIFORNIA
From 09-JUL-21 14:00:00 to 12-JUL-21 18:52:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Portions of the region saw high temperatures reach the mid to upper 90s.