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Map of 500mg geopotential height anomalies from Oct 1 through late Dec from the NCEP R1 reanalysis plotter (NOAA PSL). It depicts a region of persistent subtropical ridging that has kept SoCal extremely dry and warm, but also a conspicuous low pressure area west of the PacNW that has directed a prolonged sequence of warm/wet storms onto the West Coast from about San Francisco northward.

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Map of 500mg geopotential height anomalies from Oct 1 through late Dec from the NCEP R1 reanalysis plotter (NOAA PSL). It depicts a region of persistent subtropical ridging that has kept SoCal extremely dry and warm, but also a conspicuous low pressure area west of the PacNW that has directed a prolonged sequence of warm/wet storms onto the West Coast from about San Francisco northward.
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Daniel Swain (weatherwest@mastodon.social)'s status on Saturday, 28-Dec-2024 02:05:06 JST Daniel Swain
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The proximal culprit has been persistent subtropical ridging over and west of SoCal since autumn. This has kept SoCal high and dry (and near record-warm, too), but directed a parade of mostly warm #AtmosphericRiver storms into PacNW and NorCal. #CAwx #CAwater #CAfire

In conversation about 2 months ago from mastodon.social permalink