The first major heat wave of the year is expected to impact the Bay Area starting Tuesday afternoon.
Most of the Bay Area and neighboring counties are under National Weather Service-issued heat advisories or excessive heat warnings, as temperatures are expected to top 110 degrees inland and the mid 90s in some coastal areas through Saturday.
The Weather Service has issued two heat advisories for the Bay Area — the first is from 11 a.m. Tuesday through 7 p.m. Wednesday for San Francisco, which can expect highs in the 80s and 90s.
A heat advisory has also been issued from 11 a.m. Tuesday to 8 p.m. Saturday for the San Francisco Bay shoreline, northern Monterey Bay, northern Salinas Valley, Hollister Valley and Carmel Valley. In these areas, highs will also range from the 80s to 90s.
Excessive heat warnings have also been issued for some areas, meaning temperatures are likely to be 100 degrees or higher for two or more days.
An excessive heat warning is in place from 11 a.m. Tuesday to 8 p.m. Saturday for the Marin and Sonoma coastal ranges, North Bay interior mountains and valleys, the Santa Cruz mountains, Santa Clara Valley, eastern Santa Clara hills, East Bay hills, southern Salinas Valley, Santa Lucia Mountains, Los Padres National Forest, San Benito Mountains and interior Monterey County. Highs between the upper 90s and 110 degrees are expected.
An excessive heat warning is also in effect from 11 a.m. Tuesday to 8 p.m. Saturday for the Carquinez Strait, the Sacramento-San Joaquin River Delta, Fairfield, Suisun City, Grass Valley and Stockton. These areas may experience temperatures between 105 and 115 degrees during the day.
During periods of extreme heat, the Weather Service recommends not leaving people or pets in vehicles, limiting outdoor activities during the afternoon and evening, and staying hydrated or taking cooling breaks.
Many people will be celebrating the Fourth of July and Independence Day weekend, which may result in more people putting themselves in risky situations outside.
The Weather Service offers an extensive list and tips about staying safe during a heat wave, at weather.gov/safety/heat-during.
The heat wave can also impact pets and tips on keeping pets safe and healthy during hot weather are available from the American Society for the Prevention of Cruelty to Animals at aspca.org.
Cooling centers are also open throughout the Bay Area, with more being announced daily. A list of cooling centers is available at news.caloes.ca.gov/coolingcenters/.
Coastal areas, such as Point Reyes Station and Half Moon Bay will see cooler conditions, likely resulting in the coast seeing an uptick of visitors hoping to escape the heat during the Fourth of July holiday.
The Bay Area will also see increased fire danger through the weekend, according to Weather Service officials, and as a result, a red flag warning has been issued from 11 p.m. Monday to 11 p.m. Tuesday for Marin and Sonoma coastal ranges and through 5 p.m. Wednesday for North Bay interior mountains.
These areas will see a mix of gusty northerly winds with 25 mph guests and low relative humidity. Cal Fire recommends residents have evacuation plans in place, go bags at the ready, and to sign up for emergency alerts.
Learn more about being wildfire ready at ReadyForWildfire.org.
Additionally, PG&E also announced that parts of Sonoma and Napa Counties may experience Public Safety Power Shutoffs in high fire risk areas. PG&E has yet to release the maps of possible PSPS locations as of press time.
PSPS locations can be monitored at pgealerts.alerts.pge.com.