High pressure ridging brought hot temperatures across the area, 8 to 15 degrees above normal. Some locations had high temperatures reaching 109-113, with temperatures remaining in the mid to upper 70s overnight, locally in the low 80s in the foothills. Heat Warnings and Advisories were issued. Heat Risk Criteria reached Moderate levels across the forecast area, with some areas in the northern Sacramento Valley and adjacent foothills reaching High to Very High levels.

Heat in SHASTA LAKE/NORTH SHASTA COUNTY, CALIFORNIA
From 24-JUL-18 07:00:00 to 28-JUL-18 10:26:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

The NWS Experimental Heat Risk reached Moderate to High readings for several days prompting a Heat Advisory for northern Shasta County.

Heat in NORTHEAST FOOTHILLS/SACRAMENTO VALLEY, CALIFORNIA
From 24-JUL-18 07:00:00 to 28-JUL-18 10:26:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

The NWS Experimental Heat Risk reached Moderate to High readings for several days prompting a Heat Advisory for northeast foothills of the northern Sacramento Valley. Highs were in the low 100s, lows were in the mid to upper 70s to lower 80s.

Excessive Heat in NORTHERN SACRAMENTO VALLEY, CALIFORNIA
From 24-JUL-18 07:00:00 to 27-JUL-18 19:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

The NWS Experimental Heat Risk reached High to Very High readings that prompted an Excessive Heat Warning for the northern Sacramento Valley. Redding highs were 108 on the 24th, then reached 111 on the 25th and 113 on the 26th. Lows were in the 70s, peaking at 78 on the 24th.

Excessive Heat in CENTRAL SACRAMENTO VALLEY, CALIFORNIA
From 24-JUL-18 07:00:00 to 27-JUL-18 19:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

The NWS Experimental Heat Risk reached High to Very High readings that prompted an Excessive Heat Warning for the Central Sacramento Valley. Marysville highs were 104 on the 24th, then reached 108 on the 25th and 102 on the 26th. Lows were in the mid to upper 60s.

Excessive Heat in MOUNTAINS SOUTHWEST SHASTA COUNTY TO NORTHERN LAKE COUNTY, CALIFORNIA
From 24-JUL-18 07:00:00 to 27-JUL-18 19:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

The NWS Experimental Heat Risk reached High to Very High readings that prompted an Excessive Heat Warning for the mountains of southwest Shasta County to northern Lake County. Arbuckle Basin highs were 98 on the 24th, then reached 103 on the 25th and 106 on the 26th. Lows were in the upper 70s, peaking at 80 on the 26th.

Heat in SOUTHERN SACRAMENTO VALLEY, CALIFORNIA
From 24-JUL-18 07:00:00 to 27-JUL-18 17:54:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

The NWS Experimental Heat Risk reached Moderate to High readings for several days prompting a Heat Advisory for the southern Sacramento Valley. Downtown Sacramento peaked at 109 on the 25th. Lows were in the mid 60s.

Heat in NORTHERN SAN JOAQUIN VALLEY, CALIFORNIA
From 24-JUL-18 07:00:00 to 28-JUL-18 10:26:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

The NWS Experimental Heat Risk reached Moderate to High readings for several days prompting a Heat Advisory for northern San Joaquin Valley. Modesto reached 102 on the 24th, 106 on the 25th, 104 on the 26th. Lows were in the mid to upper 60s.

Heat in CLEAR LAKE/SOUTHERN LAKE COUNTY, CALIFORNIA
From 24-JUL-18 07:00:00 to 28-JUL-18 10:26:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

The NWS Experimental Heat Risk reached Moderate to High readings for several days prompting a Heat Advisory for northern San Joaquin Valley. Knoxville Creek reached 101 on the 24th, 104 on the 25th, 106 on the 26th. Lows were in the mid to upper 70s.