A heatwave could bring a pleasant start to summer for much of Northern California, dropping Bay Area air quality to unhealthy levels as temperatures soar into the 90s and 100s across much of the region.
A “Reserve Air” alert was issued for the entire Bay Area on Tuesday – meaning unhealthy levels of ozone at ground level are expected to cause breathing problems for people with asthma and other respiratory conditions, according to the Bay Area Air Quality Management District. . The warning comes as a high pressure ridge builds up over the region, causing temperatures to rise 10 to 20 degrees above normal on the longest day of the year.
“It’s going to be a hot start to summer,” said Emily Heller, meteorologist for the National Weather Service. “I just advise people to take outdoor breaks and stay hydrated.”
The National Weather Service issued a heat warning from 10:00 am to 10:00 pm Tuesday for nearly the entire Bay Area, including the entire East Gulf Coast, the Santa Clara Valley, the Santa Cruz Mountains, and the interior of Napa, Sonoma and Contra Costa. districts. The Sacramento Valley and northern San Joaquin Valley were also included.
Temperatures are expected to reach 90 degrees in Oakland on Tuesday and 98 degrees in San Jose. Inland parts of the East Gulf could see triple-digit highs, including Livermore, which is expected to hit 101 degrees on Tuesday.
The mild start to the season should continue for a couple more days, with temperatures dropping just a few degrees on Wednesday before dropping even further by the end of the week. However, in many places, such as San Jose and the East Bay hinterland, temperatures can stay in the 90s until at least Friday.
The heat wave, when triple-digit temperatures hit the region earlier this month, was significantly shorter, dropping about 20 degrees in two days.
The only places spared from the heat will be the cities along the coast, which can benefit from the unseasonably low temperatures in the Pacific Ocean. A weak offshore low pressure system can somewhat control the temperature in San Francisco, the Marine Headlands and Point Reyes.
Few winds are expected to accompany the heat wave — a boon in limiting fire conditions in the Bay Area, but a curse that the air will become stagnant due to pollution, meteorologists and air quality experts said Monday.
Tuesday’s air quality is expected to be the worst in the East Bay and the Santa Clara Valley, although Bay Area residents are being advised to limit outdoor activities during the hottest part of the day, said Aaron Richardson, Bay Area spokesman. Air quality management area.
He added that residents should try to work remotely on Tuesday or use public transport to reduce the smog.
“There are a lot of people with respiratory conditions and susceptibility to the weather,” Richardson said. “It’s one of those things where we can all do our part to reduce pollution.”
Despite cool winds, high temperatures are expected to continue to dry out grasses, shrubs and trees in the Bay Area, further exacerbating drought conditions that have already reached dire levels across California.
The most recent US Drought Monitor report, which was released Thursday, showed the entire Bay Area – along with 97% of the state – is in a severe drought. Of that total, 60% of the state was in severe drought—in fact, the entire Central Valley—and 12% was in exceptional drought.
“These warm, dry conditions will dry out the fuel even more,” said Roger Gass, National Weather Service forecaster. “Things are already drying, approaching the summer months.”