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December 2022 Medium-Long Range Disco


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Snow climo down here is not as robust as Philly (grew up in Roxborough/Manayunk). If we manage a 4" - 8" storm out of this for Christmas proper, it will exceed norms for IAD, BWI, DCA. That's a win in my book.

Philadelphia normal annual snowfall is 22.4 and Washington Dulles is 21. Wilmington is 20.2 and Baltimore BWI is 19.3. Very similar.


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48 minutes ago, H2O said:

This storm looks like boxing day

I'd take another chance on that setup. It was literally just a few hours off enough phasing to drag the tail across. 

There are some big flags regardless. Thankfully the crazy pv drops were just crazy model stuff. Looks more "realistic" now but it's still entirely a northern stream ULL with limited potential for a lead shot of WAA as it stands now. It's also a time of year where watching it all shift north D5 inwards is likely. Then there's temps... good snow requires the very first legitimate snow airmass of the year to be in place and ready to rock. This is a lot to come together. 

I read all posts from northern posters with a grain of salt and a pile of reality. They are chomping at the bit. They love what they see and I would too if I was forced to live in the NE. Here? I won't get involved with a quick capture or perfect ULL pass until inside of 5 days and even then it's a eternity. 

 

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1 minute ago, Negnao said:


Philadelphia normal annual snowfall is 22.4 and Washington Dulles is 21. Wilmington is 20.2 and Baltimore BWI is 19.3. Very similar.


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True, but the N&W Philly suburbs (a better comparison to IAD) get substantially more snow than PHL.

Philly will almost always do better than the DC-area with Miller Bs (where latitude often makes a difference).

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21 minutes ago, hstorm said:

True, but the N&W Philly suburbs (a better comparison to IAD) get substantially more snow than PHL.

Philly will almost always do better than the DC-area with Miller Bs (where latitude often makes a difference).

I just think back to how they cashed in on all three big storms in 2009-2010 like we did but they also can sometimes get clipped by bigger storms that whiff us. But generally, our storms are their storms and vice versa. Same with NYC for the most part, except for when they get a Boxing Day type deal where the shield is right on the coast, and I think one of the big 2009-2010 storms missed them just to the south. Boston is a whole different story.

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While we wait for the GFS, Euro Weeklies continue w/ the cold into early January. Of course a lot of this is weighted towards next week's cold snap, but the weeklies depict negative departures through much of January.

765149350_ecmwf-weeklies-avg-conus-t2m_f_anom_30day-3654400(1).thumb.png.9741e84824ee2c7e214089c1899b8622.png

This would be for the first week of January, showing cold anomalies continue with a pretty decent look up at h500. 

ecmwf-weeklies-avg-conus-t2m_f_anom_7day-3136000.thumb.png.34bae08efb5c184743984c232428215c.png

ecmwf-weeklies-avg-namer-z500_anom_7day-3049600.thumb.png.d955484c4dd52e95b0fa3130e413e369.png

Verbatim we play with that Aleutian low attempting to encroach mainland Alaska, but not enough to conduct a fully-fledged onslaught of Pacific air. The 12z EPS looked like it would go on and do that, but that look plays out near the Day 12-15 range so there's still a lot of uncertainty w/ regards to the Pacific. Also correct me if I'm wrong, but isn't that Aleutian low more characteristic of an El Niño? I recall most of the seasonal models parking an Aleutian ridge over that domain. 

 

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1 minute ago, Cobalt said:

While we wait for the GFS, Euro Weeklies continue w/ the cold into early January. Of course a lot of this is weighted towards next week's cold snap, but an overall impressive 30 day mean.

765149350_ecmwf-weeklies-avg-conus-t2m_f_anom_30day-3654400(1).thumb.png.9741e84824ee2c7e214089c1899b8622.png

This would be for the first week of January, showing cold anomalies continue with a pretty decent look up at h500. 

ecmwf-weeklies-avg-conus-t2m_f_anom_7day-3136000.thumb.png.34bae08efb5c184743984c232428215c.png

ecmwf-weeklies-avg-namer-z500_anom_7day-3049600.thumb.png.d955484c4dd52e95b0fa3130e413e369.png

Verbatim we play with that Aleutian low attempting to encroach mainland Alaska, but not enough to a fully-fledged onslaught of Pacific air. The 12z EPS looked like it would go on and do that, but that look plays out near the Day 12-15 range so there's still a lot of uncertainty w/ regards to the Pacific. Also correct me if I'm wrong, but isn't that Aleutian low more characteristic of an El Niño? I recall most of the seasonal models parking an Aleutian ridge over that domain. 

 

That is more Nino-ish.  Nina tendency is for a ridge in that area.

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1 hour ago, Negnao said:


Philadelphia normal annual snowfall is 22.4 and Washington Dulles is 21. Wilmington is 20.2 and Baltimore BWI is 19.3. Very similar.

Was referring to December snow climo. Obviously December 2009 is the gold standard, but just cover the grass for Christmas please.

32 minutes ago, Cobalt said:

While we wait for the GFS, Euro Weeklies continue w/ the cold into early January. Of course a lot of this is weighted towards next week's cold snap, but the weeklies depict negative departures through much of January.

765149350_ecmwf-weeklies-avg-conus-t2m_f_anom_30day-3654400(1).thumb.png.9741e84824ee2c7e214089c1899b8622.png

This would be for the first week of January, showing cold anomalies continue with a pretty decent look up at h500. 

ecmwf-weeklies-avg-conus-t2m_f_anom_7day-3136000.thumb.png.34bae08efb5c184743984c232428215c.png

ecmwf-weeklies-avg-namer-z500_anom_7day-3049600.thumb.png.d955484c4dd52e95b0fa3130e413e369.png

Verbatim we play with that Aleutian low attempting to encroach mainland Alaska, but not enough to conduct a fully-fledged onslaught of Pacific air. The 12z EPS looked like it would go on and do that, but that look plays out near the Day 12-15 range so there's still a lot of uncertainty w/ regards to the Pacific. Also correct me if I'm wrong, but isn't that Aleutian low more characteristic of an El Niño? I recall most of the seasonal models parking an Aleutian ridge over that domain. 

Looks like cross polar flow and a solid PNA ridge. Very good to see.

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