The cool, clean air from the north Pacific is leaving us this weekend.  Unfortunately, the Easterly winds that we usually like to see in September, the dry hot diablo winds from the northeast that used to mean beach days in San Francisco, and t-shirt weather at night, now means the air will probably contain hot smoke from the LNU Lightnings fire in Napa.

You’re probably not used to getting your weather from brokeassstuart.com.  But sadly our lives have become as sad and weather dependent as yours these days.  So we checked a dozen or so different weather sources this morning.

Complete active map of CA fires here.

Meanwhile, there is a fire warning all across the East Bay due to the hot winds and lack of humidity predicted this weekend.  This upcoming heatwave is meant to spike Sunday or Monday.  Expect the warming to being Thursday, and reach its peak Sunday/Monday.  Since the weather is, by its nature unpredictable I checked several weather reports.  And they all agree on the wind and the lack of humidity, but the winds could be only 5mph or 35mph, there’s no predicting the force yet.

ABC7 News Meteorologist Drew Tuma is tracking another triple-digit heat wave heading our way.  “Enjoy the comfortable weather because it’s going to be really hot and hazy in the Bay Area this weekend.”  That is the general consensus.

By Monday:

San Francisco, CA Weekend Weather

How the ‘Diablo Winds‘ work:

The name “Diablo wind” refers to the fact that the wind blows into the inner Bay Area from the direction of Mount Diablo in adjacent Contra Costa County, and mindful of the fiery, romantic connotation inherent in the term that translates to “devil wind”. The Diablo wind is created by the combination of strong inland high pressure at the surface, strongly sinking air aloft, and lower pressure off the California coast. The air descending from aloft as well as from the Coast Ranges compresses as it sinks to sea level where it warms as much as 20 °F (11 °C), and loses relative humidity.

Try to stay cool out there, and remember to wear a mask.