Triple-digit heat to sear Bay Area

San Francisco Chronicle - - OBITUARY - By Kim­berly Vek­lerov and Jenna Lyons Kim­berly Vek­lerov and Jenna Lyons areFran­cisco Chron­i­cle staff writ­ers. Email: kvek­lerov@ sfchron­i­, jlyons@ sfchron­i­ Twit­ter: @kvek­lerov, @Jen­naJourno

Soar­ing tem­per­a­tures Tues­day and Wed­nes­day will put some in­te­rior Bay Area cities into tripledigit ter­ri­tory, while coastal ar­eas are forecast to be around 30 de­grees cooler.

The stark mi­cro­cli­mate pat­tern will loosen its grip by the sec­ond half of the week, when hot in­land cities will see tem­per­a­tures drop to a more sea­son­able range, fore­cast­ers said.

The siz­zling tem­per­a­tures be­gan on Mon­day. By 2 p.m., Liver­more hit 100 de­grees, said Na­tional Weather Ser­vice fore­caster Steve An­der­son. Con­cord was a few de­grees be­hind at 97, and Santa Rosa was at 93, he said.

The swel­ter­ing heat isn’t ex­pected to break records, but the num­bers were forecast to creep close to record-high ter­ri­tory be­fore a cool­ing trend sets in later in the week.

“It’ll take un­til Thurs­day, but the places in triple dig­its will cool into the up­per 80s and 90s,” said Ryan Wal­brun, a weather ser­vice me­te­o­rol­o­gist. “The cooldown won’t be dra­matic by any stretch, but when you go from 103 to 80, it feels a lot bet­ter.”

A marine layer on the coast will put most cities closer to the bay in the 70-de­gree range for the week, Wal­brun said. Down­town San Fran­cisco, for in­stance, only reached 69 de­grees Mon­day and is ex­pected to be about the same Tues­day.

“You won’t have to get too far in­land to find the 80s and 90s,” Wal­brun added.

The drop in tem­per­a­tures for the sec­ond half of the week is ex­pected to usher in a pleas­ant Fourth of July week­end, fore­cast­ers said.

Ex­pect­ing bad air qual­ity from a com­bi­na­tion of hot weather and ex­haust from traf­fic, the Bay Area Air Qual­ity Man­age­ment District is­sued a Spare the Air smog alert for Tues­day.

Of­fi­cials warned that an un­healthy ac­cu­mu­la­tion of ozone was ex­pected in the area, which can cause throat ir­ri­ta­tion, con­ges­tion and chest pain; trig­ger asthma; in­flame the lin­ing of the lungs; and worsen bron­chi­tis and em­phy­sema.

Jack Broad­bent, ex­ec­u­tive of­fi­cer of the air qual­ity man­age­ment district, said the best way to help re­duce smog is to drive less.

“First, we are alert­ing Bay Area res­i­dents that air qual­ity is ex­pected to be un­healthy and to take pre­cau­tions to pro­tect their health. Sec­ond, we ask them to help re­duce pol­lu­tion by tak­ing tran­sit, car­pool­ing, walk­ing or bik­ing, in­stead of driv­ing alone,” Broad­bent said.

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