The start of the primary full month of fall will bring blistering temperatures across the Bay Area, in response to the National Weather Service. The bon voyage into the month that claims goodbye to summer shouldn't get much cooler.
“It still appears that Tuesday and Wednesday will be the hottest days this week,” said NWS meteorologist Dalton Behringer. “But the others will also be quite warm and we will feel the change from Monday.”
Behringer said the scorching conditions are expected to push the thermometer into the mid-to-high 90s in the most popular spots on Monday after which into the triple digits not less than through Thursday. Temperatures are expected to peak Wednesday, rising to not less than 105 degrees in the most popular inland areas.
It won't be much cooler anywhere else. The South Bay, Morgan Hill and San Jose are expected to succeed in not less than 96 degrees on Monday and are expected to succeed in above 100 degrees on Tuesday and Wednesday. San Mateo and Oakland are forecast to be within the upper 80s on Monday and can be within the mid-90s by midweek. Temperatures are expected to top 90 degrees in San Francisco on Tuesday.
Overall, Behringer said temperatures can be 15 to 25 degrees above average.
“Yes, that's right. It’s going to be so hot,” Behringer said. “We have high pressure aloft and an upper level low pressure that cooled it down as it moved out over the weekend.”
A heat warning was due to come into effect at 11am on Monday for the entire region and the Central Coast and was expected to remain in effect at least until Wednesday. There was also a spare-the-air alarm.
Behringer said the pattern also caused “a weak offshore current (Monday) within the morning, and that’s what is increasing the warmth and temperatures, particularly along the coast.”
The offshore winds – winds that blow toward the water rather than into it – typically contribute to dangerous fire conditions, and Behringer said some areas of the region could receive a red flag warning for fire danger before the week is out. Those areas would likely be at higher elevations and isolated, he said.
“Right now we are flirting with red flag states,” he said.
PG&E warned customers about this it may cause the power to shut off in parts of Alameda and Contra Costa counties during the heat wave. The potential shutdown is part of PG&E's Public Safety Shutoff program, which preemptively shuts off power to areas that reach a certain fire risk threshold.
Behringer said the more encouraging news is that the surface high pressure that generates the offshore winds is expected to move out of the area on Wednesday and that areas closer to the bay and coast will be significantly cooler on Thursday and Friday.
Behringer said the heat will likely continue inland and upper elevations throughout the week, with no relief for those areas until early next week.
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