This Past Week Was a Reminder of Why You Can't Trust Weather Apps for SF Heatwaves
Briefly

"The strong ridge of high pressure responsible for the scorching temperatures is not behaving as forecast and has not weakened as quickly as predicted."
"In most Bay Area heatwaves, Apple's Weather app and the National Weather Service alike tend to try to estimate average temperatures for the city, which typically do not accurately reflect how hot it is in the Mission, for instance, on any given day."
"And during a heatwave caused by a strong ridge of high pressure, SF's typical onshore breeze... can die down completely for days at a time, leading to the sweltering conditions all those of us without air conditioning have been experiencing."
Read at sfist.com
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