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Does anybody remember "the blob" that turned Seattle into a subtropical paradise back in 2014/15 while the east froze? Now the anti-blob has developed in the NE Pacific Ocean. Twitter thread here:
Does anybody remember "the blob" that turned Seattle into a subtropical paradise back in 2014/15 while the east froze? Now the anti-blob has developed in the NE Pacific Ocean. Twitter thread here:
Does anybody remember "the blob" that turned Seattle into a subtropical paradise back in 2014/15 while the east froze? Now the anti-blob has developed in the NE Pacific Ocean. Twitter thread here:
PDO going into negative phase, explains why the positive PNA has not transpired into any ridging off the West Coast apparently... So most cold setups in the eastern US this winter will have to be cold airmass dependent upstream overwhelming the GOA low and east Pac troughs.
Does anybody remember "the blob" that turned Seattle into a subtropical paradise back in 2014/15 while the east froze? Now the anti-blob has developed in the NE Pacific Ocean. Twitter thread here:
Nice thread. For those not sure... Ridging out there over the Western U.S / Pac NW = cold Eastern U.S because the Jet stream dips southbound.
Quote:
"Why do I bring this collocation up? Many probably recall the "warm blob" from a couple years ago persistent +SST anomaly in the NE Pacific that was well correlated with a western North America ridge that aided in facilitating a cold US winter east of the Rockies in 2014-15.
If we compare the two SSTA & 500mb height anomaly plots from 2014-15 and this month, they appear to be almost polar opposites, only shifted westward some this year.
This helps explain why it's been so persistently warm east of the Rockies this fall.
Some winter outlooks call for a cold & snowy winter in the eastern US - and it's possible some external factor (stratospheric PV, recurving Pacific typhoon) might alter things. But I wonder if this positive feedback cycle between the SSTs & 500mb heights might keep things warm.
I ran out of characters in my last tweet, but what I was trying to get at is that just from my synoptic "horse sense", I wouldn't be surprised to see this positive feedback cycle favor a warm & not-very-snowy start to the winter east of the Rockies..."
Also.. I started this thread in 2013.. interesting to read the post and see the pictures.
So much for the drought in he PNW and Northern California. Should ease water concerns too. Some places likely to get too much water too quickly. Snow pack in the mountains definitely beneficial
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