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January Med/Long Range Disco


WinterWxLuvr

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Euro looks to have a little sumpin' on day 6.5-7 again

looks cold enough, though barely, probably light, but I see cold air on the move to our west to save the day....or push everything east?

GEFS has a grab bag.  Only consistency is that all the members have a series of disorganized little waves meandering around the east coast.  The mean has 0.01-.1" of precip in every panel for about 3 days.  

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Storm signal on the GEFS around the 15th-16th with a trough swinging through.  Sort of looks Miller B-ish at 500mb.  

post-51-0-24691600-1420484363_thumb.png

 

Then the pattern breaks down and the +PNA/-EPO goes away so we probably turn mild for several days, verbatim.  By the end of the run, pattern certainly looks like mid-December, but with January climo, that's probably not an automatic death sentence.  Could also see how the pattern could keep evolving into a favorable state as the high heights in Ontario/Quebec keep receding toward Greenland and Baffin Island.  Also a suggestion that ridging returns out west.

 

post-51-0-57462700-1420484551_thumb.png

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euro gives everyone about an inch..maybe 2 next week. All snow

 

The pattern on the euro isn't awful, because I think it is the pattern you want if the ATL sucks...Which is a weak nina pattern with a +PNA.  That can be a productive pattern. Negative height anomalies to our north and NW and a weak SE ridge.  We go to a Nino pattern at the end of the run, but I think without a -NAO it is actually a worse pattern for us, even with its reverse 500mb height structure.

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Hey folks. Seems like models are moving into a classic Nino/+PDO pattern again. The difference between this upcoming round and the last is that we are climatologically colder. You can almost get away with the pattern being advertised down the road, even if the polar jet heights are above normal.

Jan 5-10 obviously is bringing the cold and small threats and we may have something toward the end of this cold shot, as models have been advertising.

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The pattern on the euro isn't awful, because I think it is the pattern you want if the ATL sucks...Which is a weak nina pattern with a +PNA.  That can be a productive pattern. Negative height anomalies to our north and NW and a weak SE ridge.  We go to a Nino pattern at the end of the run, but I think without a -NAO it is actually a worse pattern for us, even with its reverse 500mb height structure.

The pattern for the 15 or 16 isn't bad if it were close to verifying. The positive PNA with a trough digging enough to support a low off the southeast coast.   I'd be happy if it were a day 5 forecast as I think the look of the trough would promote a low closer to the coast then forecast but the 500h pattern probably will be different than forecast.  I do like seeing a positive PNA.

 

post-70-0-29016000-1420487815_thumb.png

 

Above map shows that a positive PNA is really important if you want a 4 inch or greater event. 

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Hey folks. Seems like models are moving into a classic Nino/+PDO pattern again. The difference between this upcoming round and the last is that we are climatologically colder. You can almost get away with the pattern being advertised down the road, even if the polar jet heights are above normal.

Jan 5-10 obviously is bringing the cold and small threats and we may have something toward the end of this cold shot, as models have been advertising.

 

What's up HM....When is our -NAO coming?  January 20th-25th?

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The pattern for the 15 or 16 isn't bad if it were close to verifying. The positive PNA with a trough digging enough to support a low off the southeast coast.   I'd be happy if it were a day 5 forecast as I think the look of the trough would promote a low closer to the coast then forecast but the 500h pattern probably will be different than forecast.  I do like seeing a positive PNA.

 

attachicon.gifPNA VS_NAO_snow.png

 

Above map shows that a positive PNA is really important if you want a 4 inch or greater event. 

that's interesting...basically, the data suggests that a +PNA is much more important than a -NAO, when it comes to 4+ inch snowstorms in DC.  People seem to obsess more about a -NAO, though.

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that's interesting...basically, the data suggests that a +PNA is much more important than a -NAO, when it comes to 4+ inch snowstorms in DC.  People seem to obsess more about a -NAO, though.

For the really big one, I think it helps having a negative NAO.  If you look at the AO, it's not quite as bad.

 

  post-70-0-91200200-1420489972_thumb.png

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that's interesting...basically, the data suggests that a +PNA is much more important than a -NAO, when it comes to 4+ inch snowstorms in DC.  People seem to obsess more about a -NAO, though.

The thing you have to keep in mind is that prior to some, if not a lot of the "positive" NAO storms, the NAO was probably negative before the storm hit (perfect example is our favorite January 2000 surprise storm 01/25/2000). That would have blocked up the pattern prior to the storm enough to allow the storm to form and hit the area nicely. So while the index would show positive while it's snowing here, the damage would have already been done by the block. Also look at how even the majority of the positive storms are very close to low positive or neutral. If you really want to see how important the NAO is, try going above a +0.5 on that chart; not many storms above 4" while below -0.5 there's many more.

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