The first part of the long Fourth of July holiday weekend is expected to bring the season’s first stretch of triple digit days to the region.

The National Weather Service has issued an Excessive Heat Warning from Friday, June 30 at 11 a.m. through Sunday, July 2 at 11 p.m.

Affected areas include the Northern Sacramento Valley, Central Sacramento Valley, Northern San Joaquin Valley, Northeast Foothills/Sacramento Valley and Motherlode counties. The area stretches from communities such as Redding, Chico, Oroville and Yuba City, to Stockton and Modesto.

Dangerously hot conditions are predicted, with temperatures of 100 to 110 expected.

Forecasters note that the extreme heat will significantly increase the potential for heat related illnesses, particularly for those working or participating in outdoor activities.

The hottest temperatures are expected Saturday, July 1, particularly across the northern and central Sacramento Valley. Area waterways will continue to run cold and fast, creating dangerous conditions for those seeking relief in rivers and lakes.

Precautionary measures are recommended. Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances.

Take extra precautions if you work or spend time outside. When possible, reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose-fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air-conditioned environments