{
 "number": 163,
 "headline": "December 21, 2023 First Day of Winter",
 "standfirst": "Winter storm system looks more promising",
 "desk": "winter",
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 "edition": "2023-12-22",
 "published": "2023-12-22T00:31:17.792000Z",
 "updated": null,
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 "body_key": "substack/139996474-december-21-2023-first-day-of-winter.html",
 "teaser_html": "<p>Stratospheric warming event?  When/if the polar vortex splits over the North Pole has been a \u201chot topic\u201d on Twitter/X over the past several days as medium/long range ensembles certainly predict such an event.  This is a multi-week process that eventually \u2014 if the stars align properly \u2014 would set the stage for a major Arctic blast to drop across Canada into the Lower 48.  The main problem, as we\u2019ve discussed everyday, is the lack of cold air in the Arctic to dump into lower latitudes.  However, there is an extreme cold pool forming over the ice sheet of Greenland that will invigorate/intensify cyclonic PV anomaly on the tropopause.</p><p>This is similar to the process that unfolded over the past 2-3 weeks over Eurasia.  A strong surface high must form \u2014 and intensify over snow cover w/radiational cooling \u2014 as the thicknesses fall due to the warmer stratosphere above.</p>",
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 "slug": "december-21-2023-first-day-of-winter",
 "path": "/mp/163/",
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 "desk_label": "Winter",
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