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February 11-19th Clippers/Hybrids


Chicago Storm

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Yeah, should be a solid event for MKE. No chance LAF beats them in this event.

 

9z plumes up to 2.4" for LAF...but p-type questions remain, as expected.

 

I think I like 2.0" and some freezing rain for here. Should be a nice "minor" mess.

 

 

 

I'd go a little higher...fairly comfortable with 2-3" but some potential to go higher if mixing isn't an issue.  So basically what I'm saying is that I can't narrow my 2-4" range yet.  :tomato:

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SREF plumes continue to be inconsistent and tell me 3" is just as likely as 6". Anyways, having the NAM as the driest model is probably a good thing and the GFS and Euro indicate around .35" qpf (virtually every Euro ensemble has at least .35").  

 

First and probably final call for MKE is 5.1"

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LOT throws a log on the ALELK fire:

NO CHANGES FOR THE LATE MORNING WINTER WEATHER ADVISORY UPDATE.

THE 12Z GFS HAS TRENDED SLIGHTLY MORE NEGATIVELY TILTED MONDAY

AFTERNOON...THAT IS A LITTLE MORE IN LINE WITH THE EC. THIS WOULD

KEEP SNOWFALL GOING IN PARTS OF FAR NE IL AND NW IN LIKELY

SLIGHTLY AFTER 6 PM. ALL GUIDANCE CONTINUING TO SHOW APPRECIABLE

LATE MORNING-MID AFTERNOON SNOWFALL RATES. WILL CONTINUE TO

FURTHER ASSESS AS WELL AS WITH SNOWFALL START TIME. SEE NOTHING

AT THIS TIME FOR ANY CHANGE THAT WOULD BE NEEDED TO THE TYPE OF

HEADLINE WITH THE AFTERNOON PACKAGE.

Final call 4.1.

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FWIW...

 

MODEL DIAGNOSTIC DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
1202 PM EST SUN FEB 16 2014

VALID FEB 16/1200 UTC THRU FEB 20/0000 UTC

...SEE NOUS42 KWNO (ADMNFD) FOR THE STATUS OF THE UPPER AIR
INGEST...

12Z MODEL EVALUATION...INCLUDING THE NAM AND GFS

 

...SPLIT FLOW UPPER TROUGH CROSSING THE CENTRAL AND EASTERN U.S.
THROUGH MONDAY AND TUESDAY...
...SURFACE LOW OVER THE CENTRAL PLAINS ADVANCING TO THE LOWER
GREAT LAKES AND NEW ENGLAND...

PREFERENCE: BLEND OF THE 00Z ECMWF/00Z GEM GLOBAL
CONFIDENCE: AVERAGE


A SPLIT FLOW UPPER TROUGH WILL CROSS THE INTERMOUNTAIN WEST TODAY
AND ADVANCE PROGRESSIVELY DOWNSTREAM ACROSS THE PLAINS AND MIDWEST
THROUGH MON. THE SRN PORTION OF THE TROUGH AXIS THOUGH IS EXPECTED
TO AMPLIFY AS IT MOVES EAST...AND THE LATEST MODELS SUPPORT A
NEGATIVELY TILTED TROUGH IMPACTING THE OH VLY/LWR GRT LAKES REGION
AND NEW ENGLAND MON NIGHT AND TUES. THIS WILL DRIVE AN
INTENSIFYING SFC LOW THAT WILL CROSS THE CNTRL PLAINS AND LIFT
NEWD INTO THE LWR GRT LAKES REGION BY EARLY TUES...BUT THERE IS
VERY GOOD AGREEMENT THAT LOW PRESSURE WILL REDEVELOP JUST OFF THE
NEW ENGLAND COAST NORTH OF THE BENCHMARK INVOF THE GULF OF MAINE.
THE 12Z NAM AND 12Z GFS HAVE BOTH TRENDED STRONGER AND BIT SLOWER
WHICH IS A TREND TWD THE ALREADY MORE AMPLIFIED AND SLOWER 00Z
UKMET/00Z GEM GLOBAL AND THE 00Z ECMWF. THE 06Z GEFS MEAN AND 00Z
ECENS MEAN HAVE TRENDED TWD THE STRONGER CONSENSUS AS WELL. THE
00Z UKMET APPEARS TO BE A LITTLE TOO SLOW...AND ESP WITH
INCREASINGLY ZONAL UPSTREAM MEAN LYR FLOW. THE 12Z NAM AND 12Z GFS
MAY STILL BE A TAD TOO FAST...AND ESP WITH THEIR TREND CONTINUING
TO BE A LITTLE SLOWER. THE STRONGEST MODEL CLUSTER FOR THE TIME
BEING IS THE 00Z ECMWF AND 00Z GEM GLOBAL.

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The evolution shown on the models for this system is funny.

 

So instead of organized northern and southern stream pieces of energy completely phasing, they only partially phase long enough for the northern stream piece to shear apart and break off from the northern stream (thus the crap outcome we get).

 

This POS system can't get out of here fast enough. 

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I'm thinking at least 95% snow here.  Always the lingering thought about WAA being underdone and resulting in more mixed precip than expected, but I'm leaning away from that at this point.  Most likely time for a mix may be right at onset until evaporational cooling would cool the entire column below freezing but this looks brief if it happens at all.  Beyond that I am banking on heavy enough precip to keep the column cold enough. 

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