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December 2022


dmillz25
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45 minutes ago, jm1220 said:

Seems very sloppy/disjointed. The early digging trough brings up lots of warm air on the east side and it seems like some kind of primary running up the Apps helps ruin it. An offshore low does congeal eventually but the airmass is ruined by the early digging trough and retreating high. Same lousy outcome here as today pretty much-there would be a strong easterly wind off the ocean. At least the preceding airmass is cold enough that there would be some snow to start but it would be a fast change to rain on the coast/city.

Not saying this will happen but that's what this run verbatim would lead to.

Honestly, I would take that at this point.

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4 hours ago, Rjay said:

Euro is 974mb over Grand Rapids

This is probably the first time in December that we could get a 974 mb Great Lakes cutter following a few days after a -4 AO and +PNA. So my guess is that the warming climate is causing wavelength changes that would have produced a KU event in the past. Just goes to show how past analogs from a colder era don’t work anymore.

67A6BFF6-29AE-4FF9-88F1-714B0F93585E.thumb.png.45f639be9c8d15ec182e81789cf84b4c.png

F981D328-EC18-4C9A-8204-8A5B60C61C4C.thumb.png.0e54111fa219be0df3298d60c8817b16.png

BC9DA03A-6E53-45AA-B948-225F66F0F2DC.thumb.png.1db1b8a857a2b002a6b8659ea3a10f41.png

 

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12 minutes ago, bluewave said:

This is probably the first time in December that we could get a 974 mb Great Lakes cutter following a few days after a -4 AO and +PNA. So my guess is that the warming climate is causing wavelength changes that would have produced a KU event in the past. Just goes to show how past analogs from a colder era don’t work anymore.

67A6BFF6-29AE-4FF9-88F1-714B0F93585E.thumb.png.45f639be9c8d15ec182e81789cf84b4c.png

F981D328-EC18-4C9A-8204-8A5B60C61C4C.thumb.png.0e54111fa219be0df3298d60c8817b16.png

BC9DA03A-6E53-45AA-B948-225F66F0F2DC.thumb.png.1db1b8a857a2b002a6b8659ea3a10f41.png

 

Brutal. Vortex looks to be moving into Ak at the end of the ensembles. 

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This is probably the first time in December that we could get a 974 mb Great Lakes cutter following a few days after a -4 AO and +PNA. So my guess is that the warming climate is causing wavelength changes that would have produced a KU event in the past. Just goes to show how past analogs from a colder era don’t work anymore.
67A6BFF6-29AE-4FF9-88F1-714B0F93585E.thumb.png.45f639be9c8d15ec182e81789cf84b4c.png
F981D328-EC18-4C9A-8204-8A5B60C61C4C.thumb.png.0e54111fa219be0df3298d60c8817b16.png
BC9DA03A-6E53-45AA-B948-225F66F0F2DC.thumb.png.1db1b8a857a2b002a6b8659ea3a10f41.png
 

giphy.gif


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19 minutes ago, bluewave said:

This is probably the first time in December that we could get a 974 mb Great Lakes cutter following a few days after a -4 AO and +PNA. So my guess is that the warming climate is causing wavelength changes that would have produced a KU event in the past. Just goes to show how past analogs from a colder era don’t work anymore.

67A6BFF6-29AE-4FF9-88F1-714B0F93585E.thumb.png.45f639be9c8d15ec182e81789cf84b4c.png

F981D328-EC18-4C9A-8204-8A5B60C61C4C.thumb.png.0e54111fa219be0df3298d60c8817b16.png

BC9DA03A-6E53-45AA-B948-225F66F0F2DC.thumb.png.1db1b8a857a2b002a6b8659ea3a10f41.png

 

That's a rather huge and alarming change though-- I pictured climate change as causing more nuanced changes.  Then again we are also having major tornado outbreaks in Louisiana in December so that's another huge and alarming change.

Do you think if this same pattern occurs in JFM it's much better for us snowfallwise?

 

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13 minutes ago, LibertyBell said:

That's a rather huge and alarming change though-- I pictured climate change as causing more nuanced changes.  Then again we are also having major tornado outbreaks in Louisiana in December so that's another huge and alarming change.

Do you think if this same pattern occurs in JFM it's much better for us snowfallwise?

 

I think it’s the record warm pool in the Western Atlantic causing more ridging there than we used to get. But notice how the day 8-10 forecast can’t detect it. We see it start to show up around day 5-7. So it makes looking at these ensembles beyond a week a low skill proposition. 

New run

DA092B5C-6339-4254-9204-FAF8C350F4A0.thumb.png.d82fc3c903243c66e1d30c99f967b34e.png

Old run

C9F1E5B8-F9C3-4839-B50F-B1AF825E6F17.thumb.png.04cae0982992543d0c5408dc008a972b.png

 

 

 

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Just now, bluewave said:

I think it’s the record warm pool in the Western Atlantic causing more ridging there than we used to get. But notice how the day 8-10 forecast can’t detect it. We see it start to snow up around day 5-7. So it makes looking at these ensembles beyond a week a low skill proposition. 

New run

DA092B5C-6339-4254-9204-FAF8C350F4A0.thumb.png.d82fc3c903243c66e1d30c99f967b34e.png

Old run

C9F1E5B8-F9C3-4839-B50F-B1AF825E6F17.thumb.png.04cae0982992543d0c5408dc008a972b.png

 

 

 

That makes sense-- we see the same thing in the summer with higher temperature departures the farther north you go.  So maybe patterns that would produce 100+ temps in the past for the coast only produce temps in the mid 90s with higher humidity now because it's getting harder to get a downslope wind?  I would have expected last summer to have one or more 100+ degree days here because the summer was so dry-- and rule number 1 to get 100 degree heat here is to have very dry soil which heats up much faster.  The sea breeze always comes in sooner or later, the key is having very dry soil to make the temperatures rise so quickly that it gets to 100 or higher before the sea breeze gets here (usually around 2 PM)

 

 

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7 minutes ago, EasternLI said:

Really hard to say. The models have been trying to figure out what to do with complicated features. In the 2 areas that are most difficult for them. North Pacific and arctic. It's like an honors exam for guidance.

gfs_z500_vort_namer_21.thumb.png.e1dc94bdff9ab940af419b5b9e2b8adb.png

Not detecting the record warm pool in the Atlantic in the midrange to long range might be the answer.  The models seem to lock in on it only when we're within 7 days.

 

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5 minutes ago, bluewave said:

This is the warmest the NW Atlantic has been during mid-December. 
 

C63D8ACB-90C4-4B57-B38F-083B8A709514.thumb.jpeg.fca4b68cb3038f5374da4e4acd6c511e.jpeg

 

 

Thanks, this is the same reason the Maine lobster season is dying out correct?  The lobsters are migrating farther north.

This also affects our local SST-- they're still in the mid 40s?  Although Ch 12 still lists them as between 52-58 lol

 

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12 minutes ago, LibertyBell said:

Thanks, this is the same reason the Maine lobster season is dying out correct?  The lobsters are migrating farther north.

This also affects our local SST-- they're still in the mid 40s?  Although Ch 12 still lists them as between 52-58 lol

 

The SSTs are still almost 60° south of Nova Scotia where the ridge axis is located.

https://www.ndbc.noaa.gov/station_page.php?station=44150

5-day plot - Water Temperature Water Temperature (WTMP): 59.5 °F


3DD655BB-451B-40EA-9076-7C8407752F9A.thumb.png.cc3c24a6482302d289c6d3558e5d6e58.png

8B0F69E1-4056-4F86-8AF4-82C2B3F91BA6.thumb.png.d226c6c7a9306dd186b6cb556c2fa7b5.png

 

9FB0D45B-0F4F-4CDD-9A1D-9BC02ECA0023.thumb.png.d77d852f7454aed07b10e6d2066aabe2.png

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