Jump to content
  • Member Statistics

    17,615
    Total Members
    7,904
    Most Online
    Vesuvius
    Newest Member
    Vesuvius
    Joined

March 11-12th Winter Storm Part 2


Chicago Storm

Recommended Posts

  • Replies 918
  • Created
  • Last Reply

 
360  
FXUS10 KWNH 110649  
PMDHMD  
 
MODEL DIAGNOSTIC DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
248 AM EDT TUE MAR 11 2014  
 
VALID MAR 11/0000 UTC THRU MAR 14/1200 UTC  

 
...SEE NOUS42 KWNO (ADMNFD) FOR THE STATUS OF THE UPPER AIR  
INGEST...  
 
==============================================  
00Z NAM/GFS EVALUATION AND PREFERENCES  
==============================================  
NAM/GFS INITIALIZATION ERRORS DO NOT APPEAR TO  
SIGNIFICANTLY AFFECT THEIR LARGE SCALE OUTPUT.  
==============================================  
   
.DEEP AND PROGRESSIVE STORM AFFECTING THE EASTERN U.S
 
 
PREFERENCE: BLEND OF 00Z GFS/ECMWF/UKMET/CANADIAN  
CONFIDENCE: SLIGHTLY ABOVE AVERAGE  
 
THIS STORM WILL PRODUCE A VARIETY OF WEATHER HAZARDS RANGING FROM  
WIND/FIRE WEATHER IN THE PLAINS TO HEAVY SNOW IN THE SOUTHERN  
GREAT LAKES AND NEW ENGLAND. BEGINNING WITH THE 12Z GFS...MODELS  
BEGAN TRENDING TOWARD A SLIGHTLY MORE AMPLIFIED SYSTEM...SHIFTING  
THE SURFACE LOW TRACK NORTH AND NORTHWEST BY A FEW TENS OF MILES  
COMPARED TO THE POSITION THAT THE ECMWF HAD BEEN LOCKED ONTO FOR  
SEVERAL RUNS. THE SHIFT IS MOST NOTICEABLE AND MEANINGFUL  
BEGINNING ALONG THE OHIO RIVER TUESDAY NIGHT AND CONTINUING  
THROUGH THE LIFE THE STORM OVER NEW ENGLAND. AGAIN...THE CHANGE IS  
RATHER SMALL...BUT IS NOW UNANIMOUS IN THE GLOBAL MODELS...WHOSE  
SOLUTIONS FROM THE 00Z CYCLE ARE NEARLY IN SYNC WITH ONE ANOTHER.  
THE UKMET TRACK IS JUST VERY SLIGHTLY FARTHER NORTH INITIALLY AND  
FARTHER INLAND OVER NEW ENGLAND...BUT NOT SO MUCH AS TO EXCLUDE IT  
FROM A BLENDED PREFERENCE.  
 
THE NAM WAS PROVIDED A MORE EXAGGERATED NORTHWARD SHIFT...ALTHOUGH  
IT WAS CONSISTENT WITH THE OVERALL TREND. WE BELIEVE THE NAM CAN  
BE DISCOUNTED BASED ON ITS UPPER TROUGH DIGGING SO MUCH DEEPER AND  
SLOWER THAN CONSENSUS. THIS HAS BEEN A COMMON ERROR IN THE NAM  
THIS WINTER.
THE NAM MOVES OUT OF PHASE WITH THE GLOBAL MODELS  
VERY EARLY IN THE FORECAST...BY WEDNESDAY MORNING.

Link to comment
Share on other sites

That's a substantial shift north for the Euro in this range. Have to think for the LOT CWA given the shifts north in all the guidance that the existing watch will be converted to a warning and warnings also hoisted for the Chicago area except maybe the far north and northwest (Wisconsin border counties). Even if amounts are forecast to be more high end advisory to lower end warning criteria-6" in 12 hours is the strict criteria- my guess is that weight will be given to the very strong winds developing, snow covered roads and snow still falling during the Weds am commute which will make for terrible travel conditions.

Good call.

Link to comment
Share on other sites

Hopefully the Chicago area folks took a look at the 3z SREF before they come tumbling downward.

 

 

Call?

 

 

I'll go relatively bullish and say 7", which falls approx. halfway between the inflated SREF mean and the floor of ~3". GFS is coming on board and ratios should be 11-12:1 or so during max. LOT harping on short duration keeping amounts in check which is a great point.

 

I'm just relieved not to be worrying about mixing...the 0z NAM was obviously not gonna work out but 6-7" gets us to within sniffing distance of the record.

 

Bonus lol @ the euro...tough winter

Link to comment
Share on other sites

I think you mean 5 below 5" with 8 below 10" at TOL. The TOL Mean is 10.14".  At least that is what I am seeing on the 3Z Run.

I think you mean 5 below 5" with 8 below 10" at TOL. The TOL Mean is 10.14".  At least that is what I am seeing on the 3Z Run.

Lol yep, that's what I get for posting right after waking up. Anyways the NMM/ARW both came south on their 6z runs

Link to comment
Share on other sites

With low deepening as it passes into southern Ohio i wouldn't be surprised to see some of us who have to deal with the warm 850's at the onset in North Central IN West Central Ohio overachieve our current  2-4, 3-5 forecast totals with some back side bands.   I'll call 5 inches with an inch of sleet  and .4 of rain IMBY. Messy messy.

Link to comment
Share on other sites

Nice

 

Snow, mainly before 5pm. Temperature falling to around 26 by 9am. Blustery, with a north wind 18 to 24 mph, with gusts as high as 38 mph. Chance of precipitation is 100%. New snow accumulation of 3 to 7 inches possible.

Link to comment
Share on other sites

Archived

This topic is now archived and is closed to further replies.

  • Recently Browsing   0 members

    • No registered users viewing this page.

×
×
  • Create New...