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June 2016 Discussions/Observations


bluewave

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It looks like the blocking might go strong through the first quarter of July. I wonder if it keeps going straight at various levels through next winter without ever really leaving. Hot summer seems completely off the table for the Northeast, I am thinking for North of DC a complete shut out. The GEFS and CFS make this point for next 2-3 weeks.

 

lol what?

 

I can't tell if your posts are serious.

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this run backed off from the inches of rain idea on the 12z run. i expect that trend to continue 

That's only because it shifted the axis of heaviest rain a bit further West into Central and Eastern PA. Thy synoptic setup is the same. Would hardly expect modeling to have an exact idea four days out.

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We have record blocking and are still above average for June.

Blocking doesnt mean cold.

 

 

There has been no record blocking in June; not sure where this notion originated. As discussed on the previous page, the location of the block in early/mid spring was not particularly conducive to persistent colder than normal here.

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There has been no record blocking in June; not sure where this notion originated. As discussed on the previous page, the location of the block in early/mid spring was not particularly conducive to persistent colder than normal here.

 

The near to record blocking this spring prevented April and May from repeating the  extreme warm departure that 

we saw in March. Blocking doesn't always mean below normal monthly departures even during the winter.

But it was enough for transient cold shots and the first below zero reading in NYC since 94 with the

blizzard and follow up snows.

 

June is starting out with a strong enough blocking to prevent the first half of the month from repeating the

heat wave and record warmth of the last week of May. But the EPS weakens this high lat blocking pattern

going forward so the heat will be allowed to return.

 

Blocking is also more than just raw indices since the 500 mb anomalies can overlap main teleconnection

regions. And as wavelengths change, so can seasonal responses.

 

There is also a distinction between high and midlatitude blocking. The record warmth over the

last year was the result of blocking near the Great Lakes and Northeast getting stuck in place

during the super Nino pattern. The midwest also saw a midlatitude block getting stuck

in place resulting in summer in March 2012 with a La Nina.

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The near to record blocking this spring prevented April and May from repeating the  extreme warm departure that 

we saw in March. Blocking doesn't always mean below normal monthly departures even during the winter.

But it was enough for transient cold shots and the first below zero reading in NYC since 94 with the

blizzard and follow up snows.

 

June is starting out with a strong enough blocking to prevent the first half of the month from repeating the

heat wave and record warmth of the last week of May. But the EPS weakens this high lat blocking pattern

going forward so the heat will be allowed to return.

 

Blocking is also more than just raw indices since the 500 mb anomalies can overlap main teleconnection

regions. And as wavelengths change, so can seasonal responses.

 

There is also a distinction between high and midlatitude blocking. The record warmth over the

last year was the result of blocking near the Great Lakes and Northeast getting stuck in place

during the super Nino pattern. The midwest also saw a midlatitude block getting stuck

in place resulting in summer in March 2012 with a La Nina.

 

 

Definitely no disagreement there. I'm a big believer in utilizing the 500mb anomalies rather than numerical values as well. Of course, blocking will imply different weather results for different regions, depending upon where that block is located. A block centered over New England/Quebec can result in brutally hot weather in August, while, a block further northeast over Greenland is typically the best location for persistent (not necessarily extreme) Northeast cold weather. We have seen quite a few EPO/Alaskan blocks since 2013 which delivered bouts of extreme cold, but overall, they've been rather transient for the East Coast. The real sustained colder than normal patterns in our area (outside of summer) generally coincide with protracted Greenland blocking, which hasn't been present since the 2010-11 winter really. There was a brief, moderate -NAO in late winter of 2012-13, but not too anomalous. The interior Northeast and Great lakes tend to be chillier via -EPO periods versus the coastal Northeast, as a +NAO in the means keeps the SE ridge resilient. 

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Definitely no disagreement there. I'm a big believer in utilizing the 500mb anomalies rather than numerical values as well. Of course, blocking will imply different weather results for different regions, depending upon where that block is located. A block centered over New England/Quebec can result in brutally hot weather in August, while, a block further northeast over Greenland is typically the best location for persistent (not necessarily extreme) Northeast cold weather. We have seen quite a few EPO/Alaskan blocks since 2013 which delivered bouts of extreme cold, but overall, they've been rather transient for the East Coast. The real sustained colder than normal patterns in our area (outside of summer) generally coincide with protracted Greenland blocking, which hasn't been present since the 2010-11 winter really. There was a brief, moderate -NAO in late winter of 2012-13, but not too anomalous. The interior Northeast and Great lakes tend to be chillier via -EPO periods versus the coastal Northeast, as a +NAO in the means keeps the SE ridge resilient. 

 

Yeah, sometimes one factor can overpower another one and create a different response than we typically see.

The developing super El Nino turned one of the strongest May -EPO blocks in 2015 into nearly our warmest May

ever. That SW Nino trough was enough to force a strong ridge over the Northeast instead of the usually lower

heights even in the spring for such a -EPO. So there can always be new combinations of 500 mb patterns.

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dt says INTERESTING the fabulous european Model far and away the best weather model in the world ay Day 7 is now as good as it was at day 3 ...20 years ago..

 

That slide he showed is talking about the ensembles which don't loop the storm back into the coast but take it OTS.

 

 

 

 

 

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The 12z Euro OP really cranks the LLJ Saturday night into early Sunday morning. You're looking at 65-70kt winds over most of LI at 925mb. At least some of that could mix down.

assuming the solution is correct-looks like it's all out on its own.  Even JB tossing it.

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