The November 20-22, 2024 Atmospheric River dropped 11.65" in San Geronimo Valley compared to much higher amounts to the north. It was not as wet as the October 2021 storm (that dropped 12.67" in 36 hours causing San Geronimo Creek to peak over twice as high). But the 2024 storm lasted longer--it rained for three days straight (except for a break during the second night). It was so nice to see the sun again on the bright yellow fall leaves on Saturday! San Geronimo Creek peaked at 1,105 cfs at 2:15 pm on Friday November 22nd (at day 3 hour 14 on the graph below). The creek started at its late summer-fall baseflow of less than 1 cfs at the Lagunitas gauge, and as of December 1st is still flowing at 7 cfs. The peak flow was similar in magnitude to last winter season's highest flow in January. We already have about a third of our annual average rainfall as of the end of November, and our 3rd-highest to-date total since water year 2012. Along with over an inch of rain in early November, this has been a wonderful start to our rainy season.
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| Barnabe and Woodacre rain are reported about 10 minutes before and after the hour, respectively, but shown on the hour here (the hourly differences are mostly due to that). The x-axis is day.hour. |
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