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The PHL/NYC Medium Range Thread - Part 2


am19psu

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Mountain torques are going off again, this time in the Himalayas. I don't see how this doesn't disrupt the polar vortex into a -AO by Feb 1.

This is like a scramble in golf in which everyone on the team takes turns in hitting great shots. The NAO carried us in the first half of the winter, now the PNA is taking its turn. Pretty soon I'm going to have to start looking up what was the coldest mod/stg la nina in PHL's history.

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Here's an example of what I mean for Elko... Our seasonal total so far is 26.4", which sounds good, right? Only slightly behind the park's 31.9...

However, the biggest event so far was 4.5" in mid December. Everything else has been SMALLER than that.

Sounds almost like Tamaqua.... :P

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Here's an example of what I mean for Elko... Our seasonal total so far is 26.4", which sounds good, right? Only slightly behind the park's 31.9...

However, the biggest event so far was 4.5" in mid December. Everything else has been SMALLER than that.

Do they melt off in between events or do you get a lasting snowcover?

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Do they melt off in between events or do you get a lasting snowcover?

Depends on the weather. Some years we don't have a lasting snow cover. This year we had snow cover from late November until mid December, lost it briefly, then got it back and just lost it again.

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Jan 9.4

Feb 6.2

Mar 4.4

Apr 2.6

May 1.2

Jun 0.0

Jul 0.0

Aug 0.0

Sep 0.1

Oct 0.8

Nov 5.0

Dec 7.4

Wow, no need for a snowblower out there, ha? Leaf blower would probably to the trick.

Side note: I love maps and geography, etc. and always thought Elko was in western NV until I googled it yesterday. :arrowhead:

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Wow, no need for a snowblower out there, ha? Leaf blower would probably to the trick.

Side note: I love maps and geography, etc. and always thought Elko was in western NV until I googled it yesterday. :arrowhead:

Our average ratio is 14:1, so while our snows definitely tend to be lighter and fluffier than the east coast, we can certainly get some low ratio slop.

Yeah, if Elko was in western Nevada I'd probably work in Reno instead ;)

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FWIW, the reforecast ensembles are showing a strong -EPO/+PNA configuration with a -AO and east based -NAO block as we head into the first week in February. That agrees with the non-model stuff I've been looking at.

z500_jsw_anom_f360_nhsm.gif

That produces these temperature anomalies at H85 for the 8-14d period.

temp850fcstanom_2011011900_pna.png

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FWIW, the reforecast ensembles are showing a strong -EPO/+PNA configuration with a -AO and east based -NAO block as we head into the first week in February. That agrees with the non-model stuff I've been looking at.

z500_jsw_anom_f360_nhsm.gif

That produces these temperature anomalies at H85 for the 8-14d period.

temp850fcstanom_2011011900_pna.png

It's a Pacific driven pattern for brutal cold across the East on the gfs ensembles over the next 10 days. Amazing how it just has to be cold in the East this winter no matter what.

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It's a Pacific driven pattern for brutal cold across the East on the gfs ensembles over the next 10 days. Amazing how it just has to be cold in the East this winter no matter what.

It's amazing to see such a powerful +PNA pattern with a strong La Niña and -PDO...basically the opposite of what you'd expect but convection near the Dateline is doing its job.

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It's a Pacific driven pattern for brutal cold across the East on the gfs ensembles over the next 10 days. Amazing how it just has to be cold in the East this winter no matter what.

Yeah its just like a great scramble team in golf. Someone is coming through every time. Really no end in sight, this is the MJO driven push Adam posted that we are starting to see.

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If you believe the statistical OLR anomalies from Paul Roundy, the atmosphere is going to behave like P6-7 for a while...

The +PNA ridge might be here longer than I originally expected.

How's this for an ensemble agreement right through 300 hrs. Seriously, there hasnt been one run of gfs ensembles that I've seen over the past week that didnt have a +PNA in the means rtight through 384hrs.

post-402-0-30617800-1295881587.gif

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Most likely that block would continue to retrograde towards Greenland, if that's the case and we set up a dual blocking pattern, February will be an historic month....

FWIW, the GFS Reforecast Ensembles show the +PNA/-EPO staying through the first week of February. And look what's popping up over the Atlantic :whistle:

z500_jsw_anom_f312_nhsm.gif

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The Euro has shifted the 7 day storm 1000 miles east in three runs. It;s now OTS after running it to the Great Lakes. I imagine this will have some effect on its accuracy scores against the other models.huh.gif

f168.gif

That has major potential on it.. the EURO again holds a cutoff in the S/W.. frame before this, northern branch digs down, but b.c the southern s/w is cut off and held back, no phase and an out to sea solution. Gonna be tough with that PIG of a PV sitting in SE canada, but can also help us out.

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I'm feeling pretty confident that we'll see the ridge over the West Coast shift west into a -EPO position by Feb 8-10. That means the cold will be centered across the Plains and could possibly bring a slight warm up here the week of Valentine's Day. That is, unless the -NAO pops back in. If that happens, the entire eastern 2/3 of the country will be below normal. I still don't have a good feel as to whether that will happen or not. The end of February looks to feature a +PNA again and, with it, more threats of major snows along the coast.

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I'm feeling pretty confident that we'll see the ridge over the West Coast shift west into a -EPO position by Feb 8-10. That means the cold will be centered across the Plains and could possibly bring a slight warm up here the week of Valentine's Day. That is, unless the -NAO pops back in. If that happens, the entire eastern 2/3 of the country will be below normal. I still don't have a good feel as to whether that will happen or not. The end of February looks to feature a +PNA again and, with it, more threats of major snows along the coast.

If the Euro weeklies are right, a +EPO/-PNA/+NAO sets up the 2nd half of the month. Not sure I'm buying that yet.

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Today's ECMWF ensemble supports the idea of retrograding the mean Northern stream trough into the upper Midwest by Feb 6-7, while the NAO becomes quite positive.

post-88-0-47997100-1296217099.gif

I'm feeling pretty confident that we'll see the ridge over the West Coast shift west into a -EPO position by Feb 8-10. That means the cold will be centered across the Plains and could possibly bring a slight warm up here the week of Valentine's Day. That is, unless the -NAO pops back in. If that happens, the entire eastern 2/3 of the country will be below normal. I still don't have a good feel as to whether that will happen or not. The end of February looks to feature a +PNA again and, with it, more threats of major snows along the coast.

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Today's ECMWF ensemble supports the idea of retrograding the mean Northern stream trough into the upper Midwest by Feb 6-7, while the NAO becomes quite positive.

Yeah, I'm ok with little blocking in the Atlantic. Sooner or later, the Hadley Cell/Walker Circulation will win out with a STH building over the basin. With the strong convective signals out the Pacific though, I'll be surprised if a +EPO/-PNA sets up like the weeklies are showing.

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