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Long duration overrunning to coastal disco 02/07-02/09


Damage In Tolland

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Will is there any thing you see, that makes you think nam could be on to something and that ridge may indeed by flat

 

 

Too early to tell...all the important pieces are in the Pacific right now...there's another big shortwave behind the stuff that causes the storm that is important too as it turns into a decent storm off the west coast and pumps the ridge up...the NAM has this weaker.

 

You would naturally trust the global models to handle that feature better given it is out of the NAM's domain...but there is no guarantees the globals have it right either. But all else equal, you would favor them...and given all the unknowns currently, that is the way I'd lean.

 

This is typically where the Euro should really excel with it's data assimilation scheme. We'll see how it performs.

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Too early to tell...all the important pieces are in the Pacific right now...there's another big shortwave behind the stuff that causes the storm that is important too as it turns into a decent storm off the west coast and pumps the ridge up...the NAM has this weaker.

 

You would naturally trust the global models to handle that feature better given it is out of the NAM's domain...but there is no guarantees the globals have it right either. But all else equal, you would favor them...and given all the unknowns currently, that is the way I'd lean.

 

This is typically where the Euro should really excel with it's data assimilation scheme. We'll see how it performs.

This complex system should be a good test for the new GFS.

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This complex system should be a good test for the new GFS.

 

 

GFS and Euro aren't very far apart right now, which gives more confidence to the globals. Euro was a bit more consolidated with the Monday part of the system, but both are pretty similar with the overrunning and location of the boundary

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GFS and Euro aren't very far apart right now, which gives more confidence to the globals. Euro was a bit more consolidated with the Monday part of the system, but both are pretty similar with the overrunning and location of the boundary

Did you think the RGEM sided more with the NAM? Either way, GFS and EURO shaking hands is great
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Canadian started off cooler, but got a bit warmer at 00z, however the s/w for Monday looked better at 00z as compared to 12z.

 

 

Its definitely south with the overrunning prior to Monday. But then it looke dlike it went a shade warmer for the coastal part...but it's still kind of disorganzied.

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WPC says completely ignore the NAM

 

SYSTEM MOVING THROUGH NORTHERN PLAINS SAT

AMPLIFYING EASTERN TROUGH SUNDAY/MONDAY
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
PREFERENCE: NON-NAM COMPROMISE
CONFIDENCE: ABOVE AVERAGE

THE 00Z NAM AMPLIFIES THE MID-LEVEL SHORTWAVE ACROSS THE PRAIRIE
PROVINCES OF CANADA SATURDAY AS IT IS ROUNDING THE TOP OF THE MEAN
RIDGE, WHICH IS IMPLAUSIBLE. THIS LEADS TO A MID-LEVEL TROUGH
WITH HEIGHTS 60+ METERS DEEPER THAN THE REST OF THE GUIDANCE AS IT
TRAVELS THROUGH THE NORTHERN TIER OF THE COUNTRY -- ITS USUAL BIAS
-- WHICH LEADS TO A MORE NORTHERLY SURFACE LOW SOLUTION FROM THE
GREAT LAKES EASTWARD FROM SUNDAY ONWARD THAT LIES COMPLETELY
OUTSIDE THE 12Z GLOBAL ENSEMBLE SPREAD. A NON-NAM COMPROMISE IS
PREFERRED HERE WITH ABOVE AVERAGE CONFIDENCE.
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The GGEM gets the 850mb line up to Boston beginning at 84 hr and remaining there at least through 102 hr.

80%+ of the precip has fallen before that though for that region, just probably some sprinkles or light drizzle at that point. Damage has been done with warning level snows prior to that time.

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