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Christmas Grinch Storm Potential


Chicago Storm

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The jet energy associated with this system caused some turbulence related injuries near Japan yesterday, the Euro showed 200kt jet coming off the coast of Japan yesterday around the time of the turbulence.

 

More about the story here: http://www.washingtonpost.com/blogs/capital-weather-gang/wp/2014/12/16/huge-storm-near-northern-japan-linked-to-injuries-on-american-airlines-flight-from-turbulence/

 

This beauty. 

 

post-8696-0-26739000-1418873444_thumb.pn

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Windshield wiper for the next few days should be NY to MSP. Tons of energy diving down and this won't begin to be resolved until Sunday/Monday. Big storm but location is in question.

 

A nice lesson for Ensembles is to look at the most recent east coast storm. Nearly all the member had a very amplified solution near the coast (NJ/NY) at this time frame, it is going to be a slider off the coast so ensemble support at times doesn't equate to accuracy. 

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00z parallel GFS gonna be at odds with the op GFS again.

I will buy the parallel, the old GFS is too flat and has too poor of resolution to get the subtle shortwaves resolved correctly. The old GFS just sees everything as sheared shortwaves vs consolidated shortwaves.

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Looks northern stream dominant. Main storm may be even further east than the 18z.

 

Yeah the GFS is known to move the S/W out too quickly or too slowly. The GFS is mishandling the shortwaves and the timing badly. Strangely enough, it develops a secondary low off the cold front which in turn becomes a retrograding Nor'Easter and some areas end up seeing some decent snow. Odd solution. Wouldn't bank on it. 

 

edit: The pressure is down to 964mb near the Hudson Bay, wow! 

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00z parallel GFS gonna be at odds with the op GFS again.

 

Still too late for most that matter.. Issue is the northern energy which does not drop far enough south. To get the bomb ( like the euro ) the northern energy is gonna have to go further south like it did on the euro..

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Still too late for most that matter.. Issue is the northern energy which does not drop far enough south. To get the bomb ( like the euro ) the northern energy is gonna have to go further south like it did on the euro..

 

Well the clipper is further south on this run than the 18z, but its mishandling the southern energy and moves it out too quickly. Therefore, no phase and we get some odd solution. 

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WPC's evening take thus far...informative and humorous

 

 

EXTENDED FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
1126 PM EST WED DEC 17 2014

VALID 12Z SUN DEC 21 2014 - 12Z THU DEC 25 2014

...STRONG SYSTEM POSSIBLE IN THE EAST FOR CHRISTMAS EVE/DAY...


..OVERVIEW AND GUIDANCE PREFERENCES...

AMPLIFIED PATTERN SET TO RETURN TO THE US AS THE STRONG W PACIFIC
JET TRANSLATES DOWNSTREAM THIS WEEKEND INTO THE PAC NW. BUILDING
HEIGHTS OVER SE CANADA SHOULD ALSO HELP DIG THE TROUGH INTO THE
OHIO VALLEY MIDWEEK AND LIKELY CLOSE OFF AS IT SWINGS INTO
SOUTHERN CANADA ON CHRISTMAS DAY. MODELS/ENSEMBLES HAVE BEEN
FAIRLY CONSISTENT IN RECENT RUNS ON THIS AMPLIFIED PATTERN AND THE
MOST RECENT GEFS/ECMWF ENSEMBLE GUIDANCE SHOW GOOD CORRELATION TO
NEXT THURSDAY. ONGOING DIFFERENCE BETWEEN THE TWO IS A TYPICAL
ONE... WITH THE GEFS MEMBERS A BIT QUICKER WITH THE PATTERN THAN
THE ECMWF MEMBERS. AMPLIFIED PATTERN WOULD TYPICALLY FAVOR THE
SLOWER /ECMWF-LIKE/ SOLUTIONS BUT UPSTREAM PACIFIC ENERGY MAY BE
ENOUGH OF A KICKER TO KEEP THINGS MOVING. BLEND OF THE GUIDANCE...
GFS/ECMWF/GFS PARALLEL AND THEIR MEANS... SHOULD PROVE GOOD ENOUGH
BUT OPTED TO USE THE BETTER CLUSTERED 12Z ECMWF AND 18Z PARALLEL
GFS WITH THE ECMWF ENSEMBLE MEAN WHICH OFFERED A BIT MORE DETAIL.
HOWEVER... DESPITE THE GOOD AGREEMENT THE MODELS ALWAYS FIND A WAY
TO CHANGE THE DETAILS... WHICH WAS ONE REASON FOR TRENDING TOWARD
THE ECMWF ENSEMBLE MEAN BY THURSDAY. MONTHLY RECORD LOW SEA LEVEL
PRESSURE RECORDS COULD BE CHALLENGED IN SOME LOCATIONS OF THE
CENTRAL GREAT LAKES -- WHICH ARE NEAR 970 IN THE UP OF MICHIGAN TO
THE LOW 980S IN N OHIO. DEEPEST ENSEMBLE MEMBERS ARE IN THE 950S
MB RANGE WHICH IS IMPRESSIVE.


ALSO BY LATE IN THE PERIOD IS UPSTREAM KICKER ENERGY THAT MAY DIVE
DOWN INTO THE WEST. 12Z ECMWF REPRESENTS ABOUT THE STRONGEST SIDE
OF THE ENSEMBLE SPREAD. GIVEN THE FACT THAT THE SPAGHETTI CHARTS
OVER THE PACIFIC LOOK LIKE ABSTRACT ART... A TREND TOWARD THE
MEANS /ECMWF ENSEMBLE MEAN IN THIS CASE/ WORKED WELL AT BOTH ENDS
OF THE CONUS.

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WPC's evening take thus far...informative and humorous

 

 

Would be pretty impressive if we get 2 really deep lows in the Lakes a month apart.  I will post the December pressure records for various places as I did with the November storm if it looks like they will be approached/broken.

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