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December 20-22 Winter Storm (Blizzard?) Potential


Hoosier

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I think you do a little better than that...but it's best case scenario in a changeover situation. Always leery of those kind of deals...

We're still 48 hours out but the American models once again giving in to the Euro is nice to see. An 0z GFS scenario just isn't going to bring good totals to NE IL but would deliver an a couple hours of cool weather. If we can get a few more more shifts SE then things could get interesting but you also have to imagine we'll be dealing with a less dynamic storm in that case...so this might be as good as it gets.

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Seems like the GFS gets stronger with lake enhancement off of LM with each run once the low is east of said lake.

That is the one thing to glean from this. Everyone in the MKE and Chicago areas seems to be overreacting to this run, it only looks like 3-6" in the areas near the lake due to the 0C line moving through around 18z. Only about 0.4-0.5" of QPF falls after that time. It's a decent run but let's not overreact. The lake enhancement is a decent point though. These further SE tracks make that a possibility, however remote.

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We're still 48 hours out but the American models once again giving in to the Euro is nice to see. An 0z GFS scenario just isn't going to bring good totals to NE IL but would deliver an a couple hours of cool weather. If we can get a few more more shifts SE then things could get interesting but you also have to imagine we'll be dealing with a less dynamic storm in that case...so this might be as good as it gets.

I really can't argue with any of this logic.

But yeah, a couple hours of fun would be nice. I'm just hoping for a few sideways snowflakes down here.

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That is the one thing to glean from this. Everyone in the MKE and Chicago areas seems to be overreacting to this run, it only looks like 3-6" in the areas near the lake due to the 0C line moving through around 18z. Only about 0.4-0.5" of QPF falls after that time. It's a decent run but let's not overreact. The lake enhancement is a decent point though. These further SE tracks make that a possibility, however remote.

About 12 noon it flips over to snow up and down the lake. 66-67 hours guesstimate from wunderground maps. The deformation band will be totally below freezing at the surface.

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HPC says....no no no ECMWF....this is pre-GFS....FWIW

MODEL DIAGNOSTIC DISCUSSION

NWS HYDROMETEOROLOGICAL PREDICTION CENTER COLLEGE PARK MD

1108 PM EST MON DEC 17 2012

VALID DEC 18/0000 UTC THRU DEC 21/1200 UTC

...LOW PRESSURE DEEPENING FROM THE SRN PLAINS NEWD INTO THE GREAT

LAKES REGION...

PREFERENCE: NON-ECMWF CONSENSUS

CONFIDENCE: AVERAGE

THE 00Z NAM AND 18Z GFS ARE A BIT FASTER AND ALSO QUICKER TO

ADVANCE AND DEEPEN SFC LOW PRESSURE OUT OF THE SRN PLAINS ON TUES

AND THEN NEWD OVER THE MID MS VLY AND TWD THE GREAT LAKES REGION

WED AND THURS. THE 12Z ECMWF IS NOW GENERALLY THE SLOWEST OF THE

MDLS THROUGH THE PD...WITH THE 12Z UKMET/GEM GLOBAL SOLNS

GENERALLY CLOSE TO THE 00Z NAM/18Z GFS CAMP. THE 12Z ECMWF IS ALSO

RIGHT OF THE GLOBAL MDL CONSENSUS WITH THE SFC LOW TRACK...WITH

ONLY THE 12Z ECENS MEAN SUPPORTING A TRACK THIS. THE 18Z GEFS AND

21Z SREF ARE LEFT OF THE 12Z ECMWF/ECENS MEAN CAMP AND ALSO FASTER.

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HPC says....no no no ECMWF....this is pre-GFS....FWIW

MODEL DIAGNOSTIC DISCUSSION

NWS HYDROMETEOROLOGICAL PREDICTION CENTER COLLEGE PARK MD

1108 PM EST MON DEC 17 2012

VALID DEC 18/0000 UTC THRU DEC 21/1200 UTC

...LOW PRESSURE DEEPENING FROM THE SRN PLAINS NEWD INTO THE GREAT

LAKES REGION...

PREFERENCE: NON-ECMWF CONSENSUS

CONFIDENCE: AVERAGE

THE 00Z NAM AND 18Z GFS ARE A BIT FASTER AND ALSO QUICKER TO

ADVANCE AND DEEPEN SFC LOW PRESSURE OUT OF THE SRN PLAINS ON TUES

AND THEN NEWD OVER THE MID MS VLY AND TWD THE GREAT LAKES REGION

WED AND THURS. THE 12Z ECMWF IS NOW GENERALLY THE SLOWEST OF THE

MDLS THROUGH THE PD...WITH THE 12Z UKMET/GEM GLOBAL SOLNS

GENERALLY CLOSE TO THE 00Z NAM/18Z GFS CAMP. THE 12Z ECMWF IS ALSO

RIGHT OF THE GLOBAL MDL CONSENSUS WITH THE SFC LOW TRACK...WITH

ONLY THE 12Z ECENS MEAN SUPPORTING A TRACK THIS. THE 18Z GEFS AND

21Z SREF ARE LEFT OF THE 12Z ECMWF/ECENS MEAN CAMP AND ALSO FASTER.

With only the 12z Euro ensemble mean supporting a track like this.

As if...

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