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February 11-19th Clippers/Hybrids


Chicago Storm

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This is from earlier today from DTX on their expectations and why they are leaning toward the foreign models compared to the American models:

 

 

DURING THE FIRST PART OF THE UPCOMING WEEK...THE FLOW REGIME ACROSS
THE CONUS WILL BRIEFLY TRANSITION TO A PROGRESSIVE HIGH INDEX
CONFIGURATION WITH PLENTY OF SUB-SYNOPTIC POSITIVE PV FEATURES
EVOLVING IN CLOSE PROXIMITY. THIS EVOLUTION IS COURTESY OF THE
BREAKDOWN OF THE EASTPAC LONGWAVE TROUGH COMPLEX...AS A STRONG
JETLET SOUTH OF THE ALEUTIANS AGGRESSIVELY DRIVES EASTWARD THROUGH
THE WAVE TRAIN. THIS FEATURE IS THE CORNERSTONE TO ANY BAROCLINIC
WAVE DEVELOPMENT OVER THE MID-MISSISSIPPI VALLEY AND SOUTHERN GREAT
LAKES REGION LATE MONDAY AND MONDAY NIGHT.

PLENTY OF VARIANCE IN SOLUTION DEPICTIONS ALL TIED TO THE
VARIATIONAL PHASE SPEEDS OF THE WAVE INDUCED FROM THE JET STREAK
DRIVING EAST AND A SMALLER PV ANOMALY SEPARATING FROM THE SOUTHERN
EXTENSION OF THE EASTPAC TROUGH NEAR NORTHERN CALIFORNIA. THIS
SMALL FEATURE HAS AN OPPORTUNITY TO UNDERGO RAPID AMPLIFICATION...IF
IT CAN STAY AHEAD OF THE MAIN NORTHERN STREAM WAVE...ALLOWING IT TO
FEAST OFF OF THE MAIN HEIGHT FALL CENTER OVER THE GREAT LAKES REGION
MONDAY EVENING. THE 15.12 ECMWF/UKMET/CMC GLOBAL SOLUTIONS ALL HAVE
SOME FLAVOR OF PHASED DEVELOPMENT. WHILE THE NAM AND GFS ARE FASTER
WITH THE NORTHERN WAVE...DAMPENING THE DEVELOPMENT SEQUENCE
/ESPECIALLY THE GFS/. CORRELATING KEY FEATURES WITH GOES-WV IMAGERY
SUGGEST THE NON-NCEP CAMP HAS THE ADVANTAGE ON THE POSITIONING AND
TRANSLATION OF THE AFORMENTIONED EASTPAC FEATURES.

THE TRENDS OF THE ECMWF HAVE BEEN TO REDUCE THE RATE OF
DEVELOPMENT...AND THIS IS ALSO SUPPORTED BY THE UKMET AND CMC GLOBAL
SOLUTIONS. THAT SAID...THE AMOUNT OF NON-LINEARITY IN SUCH A
SHORT-WAVELENGTH PHASING PROCESS COMMANDS RESPECT FOR OVERACHIEVING
DEVELOPMENT OVER THE SOUTHERN LAKES REGION MONDAY EVENING.

FORECAST HAS A DISTINCT 15.12 ECMWF FLAVOR. LIQUID EQUIVALENT
PRECIPITATION AMOUNTS ARE EXPECTED TO BE IN THE HALF INCH
NEIGHBORHOOD SUPPORTED BY A MIXING RATIO RESERVOIR OF 3-4 G/KG
AVAILABLE FOR THE INCOMING FORCING. SNOW RATIOS WILL BE NEAR
10-12:1 WITH THE RATHER INTENSE RATES AND RELATIVELY WARM COLUMN -
SETTING THE STAGE FOR A 4-6 INCH EVENT ACROSS MUCH OF SOUTHEAST
MICHIGAN MONDAY EVENING INTO THE OVERNIGHT HOURS /PEAK FORCING IN A
6 HOUR WINDOW MONDAY EVENING/. THE RELATIVELY SHORT DURATION OF
MAXIMUM FORCING ASSOCIATED WITH THE CARVING WAVE MERGER CERTAINLY
CAPTURES ONE/S ATTENTION.

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Starting to feel very confident on a solid event with this one.  Looking like a good 4-5" of good, dense snowfall here.  May have a brief period of pingers within the first hour of the event, but should quickly transition to all snow. 

I really hope your area overachieves, you guys deserve a winner this time around.

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I really hope your area overachieves, you guys deserve a winner this time around.

 

Yeah we'll see.  The Euro tends to be a tad dry, so I'm thinking tomorrows NCEP runs will be interesting.  GFS has been a bit too wet with some of the clippers here this season, so the fact that it's drier than the Euro is a bit interesting.  The Euro and GEM have been in decent agreement with things the last few runs, so that adds confidence to the GFS being a bit too weak/dry.  NAM has been the wetter of the NCEPs, but that's not surprising lol.  Wouldn't be surprised to see it come in very wet tomorrow, but would probably end up being too wet as usual. 

 

This storm has potential to breach the 6" barrier for here and surrounding areas, but I'm guessing it will fall a bit short.  Would need it to slow down just a bit, and have it be a bit stronger.  Possible, but not expecting it at this point.

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I think the GFS is a bit too fast still and part of the reason it is going to be a bit cheap on the QPF is that inherently its grid scale resolution isn't going to pick up on mesoscale banding features that the other models would catch up on. That being said the GFS 06z run took a step toward a wetter more phased solution.

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looks like this GFS is going to be right about this not being a major. Duration was always working against it. 2.8" call looking decent but probably an inch light.

You mean the GFS that has progressively gotten wetter on consecutive runs for the last 6 and has gone closer to the rest of model consensus?

 

http://www.twisterdata.com/index.php?prog=forecast&model=GFS&grid=3&model_yyyy=2014&model_mm=02&model_dd=16&model_init_hh=06&fhour=72&parameter=PCPIN&level=48&unit=HR&maximize=n&mode=dprogdt&sounding=n&output=image&view=large&archive=false

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