As we lean towards November, the US weather pattern remains very interesting. Following what’s likely to be a record warm October for much of the Lower 48 east of the Rockies, we have just witnessed an impressive late October snowstorm for the interior Northeast. Nothing unprecedented by any means but impressive given how warm it’s been.
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The reason for such swings is down to the active Pacific storm pattern driving one system after the next into the West Coast, the -AO which is allowing colder air into the mid latitudes, meeting the residual warmth and highly amplifying the pattern throughout the hemisphere.
What’s interesting is that snow cover across Canada is slightly ahead of schedule as seen from the below graphic.
Today’s GFS 500mb and surface shows one system leaving while another moves into California, the ridge gets pumped in between.
Check out those positive anomalies in between cool pools on both coasts!
Why is the warmth remaining strong, unusually so for this late in the season? It’s likely down to several factors including Super El Nino and unusually warm Gulf of Mexico and Atlantic Ocean up against the US.
This next West Coast low is hitting further south, this time California rather than Pacific Northwest. While wind, rain and snow will pound the West, so a warming southerly flow drives record heat back into the Plains and eventually the Midwest and East.
Good for the drought.
As the system crashes into California, so the heat resurges further east!
See this morning’s video.
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