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Post Turkey Day Storm Threat


Baroclinic Zone

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Time for a threat thread since it seems like we might see some sort of system effect the area and could mess with peoples travel plans. Model runs as of 11/19

12z GFS has a sheared out suppressed system

12z CMC has a strong primary low up through the GL and pops a secondary too late for most

12z Euro looks similar to the CMC

18z GFS similar to the 12z solution with a sheared out system, maybe a tad better.

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Wed?

Yeah it may be a Wednesday event. Timing is still pretty uncertain.

Best chance for frozen out of this would likely be on the front end with some snow/ice possibility in the interior. I still think it will be mostly rain but with such uncertainty regarding the huge NAO block to the northeast and the amplitude of the central/western trough, we can't rule anything out yet.

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Time for a threat thread since it seems like we might see some sort of system effect the area and could mess with peoples travel plans. Model runs as of 11/19

12z GFS has a sheared out suppressed system

12z CMC has a strong primary low up through the GL and pops a secondary too late for most

12z Euro looks similar to the CMC

18z GFS similar to the 12z solution with a sheared out system, maybe a tad better.

I'm riding on the GFS train fwiw.

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00z Euro actually start off the T-day event as snow for a while on Thanksgiving morning. Eventually going to rain after a transition of some ice in the interior.

But given the model swings on each run, its hard to take much seriously yet. The system is still nearly 6 days out. Long range OP Euro is back to looking awful, however the ensembles continue to show a great pattern post T-day. Back to bed.

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00z Euro actually start off the T-day event as snow for a while on Thanksgiving morning. Eventually going to rain after a transition of some ice in the interior.

But given the model swings on each run, its hard to take much seriously yet. The system is still nearly 6 days out. Long range OP Euro is back to looking awful, however the ensembles continue to show a great pattern post T-day. Back to bed.

The Op Euro I have to admit is starting to concern me with back to back torch runs and no cold shots..but as long as the steadfast ensembles still look good..I feel pretty confident

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0z ecwmf out to lunch?

from 347am preliminary long term discussion HPC

THE 00Z

ECMWF APPEARED MUCH STRONGER THAN ANY OF ITS PREVIOUS THREE RUNS

WHICH WAS ALSO SEVERAL MB DEEPER THAN THE GLOBAL MEANS. SO ONLY A

SMALL PORTION OF THIS OPERATIONAL ECMWF WAS UTILIZED EARLY ON. BY

WED...THE 00Z ECMWF SEEMS TO BE ON THE SLOW AND STRONG END OF THE

ENVELOPE OF GUIDANCE HOLDING MUCH OF THE SHRTWV ENERGY BACK ACROSS

THE INTERMTN WEST. THE 00Z GFS/GEFS MEAN AND 12Z ECMWF ENS MEAN

ALL ARE IN GOOD AGREEMENT WITH THE GFS/ECMWF TIME-LAGGED AVG

PLOTS. THESE DEPICT THE TROF CROSSING INTO THE HIGH PLAINS BY

EARLY WED. AS THE 00Z GFS APPEARED TO BE IN DECENT AGREEMENT THRU

DAY 5...THU...WITH THE GLOBAL ENS MEANS...A SIGNIFICANT PORTION OF

THE MODEL BLEND WILL COMPRISE THIS PARTICULAR OPERATIONAL

GUIDANCE. THE ECMWF CONTINUES TO BE ON ITS OWN BEING SLOW AND

OVERDEVELOPED WITH THE CLOSED LOW POSITIONED ACRS THE MID MISS

VALLEY THU MORNING. IT ALSO SEEMS TO BE PLAGUED BY ISSUES

RESOLVING THE H5 FIELD ACRS THE WEST. IN ADVANCE OF THE NEXT SET

OF HGT FALLS OUT OF THE NE PAC...NO SIGN OF A DOWNSTREAM RIDGE

AXIS IS VISIBLE IN THE 00Z ECMWF.

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