![]() ![]() “That I think is probably what happened in 1904,” Null said. Similar conditions may have driven an even weirder September over a century ago. The recent heat wave was caused by a ridge of high pressure while rain this week has been caused by a trough of low pressure. When these swings come back to back, unusual weather events can occur one after another. “Next to big ridges, you have big troughs,” said Jan Null, a meteorologist with Golden Gate Weather Services and adjunct professor at San Jose State University. Such dramatic swings in weather can happen when the jet stream - a sinusoidal track of west-to-east winds miles above the United States - is extra-wavy. Last weekend, storms buffeted by typhoons in the western Pacific brought uncommon September showers to the Bay Area. Tropical Storm Kay traveled unusually far north along the Baja California Peninsula and brought heavy downpours to Southern California, causing flash flooding and mudslides. ![]() 6 and jumped into El Dorado County, spurring evacuations for thousands of people.Īnthony Fallstead, who is homeless, seeks help in Santa Rosa during the heat wave early this month. The largest wildfire of the year broke out in Placer County on Sept. A slew of all-time temperature records were broken across California and in the Bay Area. This September has felt like a never ending series of extremes.Īt the beginning of the month, Californians endured a historic heat wave, with a week and a half of sweltering temperatures. Brontë Wittpenn/The Chronicle Show More Show Less The heat wave was one of the worst in the state’s history and smashed temperature records across the Bay Area and Northern California. 7, the seventh day with a heat dome over California. Chronicle archives Show More Show Less 5 of5ĭried sunflowers stand in a field near in Cottonwood Slough (Yolo County) on Sept. 25, 1904: The Chronicle covered a rainstorm that caused damage throughout the state of California. Chronicle archive Show More Show Less 4 of5 9, 1904: The San Francisco Chronicle covered record heat and a wildfire near Santa Cruz. John Storey/Special to The Chronicle Show More Show Less 3 of5 Three men look at the Golden Gate Bridge as storm clouds linger last Sunday. Chronicle archives Show More Show Less 2 of5 While parades were canceled and homes damaged during a record September 1904 rainstorm in San Francisco, baseball games continued in the pouring rain. ![]()
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