Excessive Heat in Carquinez Strait and Delta, California

High pressure ridging brought a heat wave to Northern California over the Memorial Day weekend holiday. Temperatures reached upwards of 20 to 25 degrees above climatology. Several new record daily high temperatures and one record monthly high temperature record were set in the area. At the peak of the heat wave on the 31st, Redding reached 109 breaking both the daily and monthly high temperature records. Red Bluff reached 108, setting a new daily high temperature record. Downtown Sacramento hit 106 tying the daily high temperature record. Sacramento Executive Airport reached 105 setting a new daily high temperature record. There were three cooling centers open in Sacramento County, one in Yolo County, one in Butte County and one in San Joaquin County.

The first major heat event of the year brought widespread moderate to high heat risk Memorial Day weekend to Northern California. Some Valley locations reached over 100 degrees for the first time this year. Several new record daily high temperatures and one record monthly high temperature record were set in the area.