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December 13-14th Winter Storm


Chicago Storm

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Hmmm, point and click forecast for Detroit city-proper.
 

 

Friday Night Snow likely, mainly after 1am. Cloudy, with a low around 20. Chance of precipitation is 70%. New snow accumulation of 1 to 2 inches possible.

Saturday Snow likely. Cloudy, with a high near 27. Chance of precipitation is 70%. New snow accumulation of 2 to 4 inches possible.

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So would this make the 18z NAM more likely to verify?

 

It depends on whether the first southern stream vort ends up stronger than its kicker, which on this run is much weaker. It could just be a NAM blip but the weaker kicker is why the initial vort is slower so in a vacuum it makes meteorological sense. The thing is the strength of the kicker wave. The stronger it is earlier the less of a chance the initial vort slows.

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it's still a swing and miss on a proper phase and I don't think there's much more wiggle room.

Not expecting a full phase with this one at this point, that potential is long gone, however any interaction between the 2 waves is golden. We need the southern stream wave to be further north for the region as it brings the moisture up here, without that it will be another clipper fail.

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We'll see what happens in the next few days as the pieces of energy get fully sampled. We'll get a clear picture by this time Friday in determining if we get a minor snowfall (1-2") or a moderate snowfall (4+").

Also got to keep an eye on the potential for lake effect snow of lake ontario and an arctic front which could enhance accumulations.

 

NAM is 3-6'' for us verbatim.

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Not expecting a full phase with this one at this point, that potential is long gone, however any interaction between the 2 waves is golden. We need the southern stream wave to be further north for the region as it brings the moisture up here, without that it will be another clipper fail.

 

 

ok gotcha, I wasn't sure what you were on the board for. This is definitely a step in the right direction for those on the border

post-163-0-17426100-1386796534_thumb.jpg

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Also got to keep an eye on the potential for lake effect snow of lake ontario and an arctic front which could enhance accumulations.

NAM is 3-6'' for us verbatim.

Yeah, models keep hinting at a small wave passing by our area Friday afternoon. That could give us an inch or so before the main show on Saturday.

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nicely done by RC from LOT

 

OTHERWISE...ATTENTION TURNS TO THE SYSTEM CURRENTLY ACROSS THE  
SOUTHWESTERN CONUS. MODEL GUIDANCE CONTINUES IN GOOD AGREEMENT IN A  
NORTHERN STREAM SYSTEM...CURRENTLY ACROSS THE EASTERN  
PACIFIC...DIGGING SOUTHEASTWARD ACROSS THE WESTERN CONUS AND  
ESSENTIALLY EJECTING THE SOUTHWEST SYSTEM OUT ACROSS THE SOUTHERN  
PLAINS BY EARLY FRIDAY. THIS LOOKS TO SUPPORT AN INVERTED GULF COAST  
SURFACE TROUGH ACROSS THE AREA INTO SATURDAY. IT APPEARS THAT A GOOD  
DEAL OF MOISTURE COULD LIFT NORTHWARD AHEAD OF THIS SURFACE  
TROUGH...SETTING UP GOOD ISENTROPIC ASCENT ACROSS A GOOD DEAL OF  
CENTRAL AND SOUTHERN ILLINOIS LATE FRIDAY AND FRIDAY NIGHT. THIS  
COULD RESULT IN THE DEVELOPMENT OF SNOW ACROSS MY SOUTHERN COUNTIES  
AS EARLY AS LATER FRIDAY AFTERNOON AND THEN SPREADING ACROSS MOST OF  
THE AREA BY FRIDAY EVENING.  
 
THIS SYSTEM IS STILL A COUPLE DAYS AWAY SO UNCERTAINTY...PARTICULARLY  
IN THE MESOSCALE ASPECTS OF THIS SYSTEM ARE STILL HIGH. AT THIS  
TIME...IT APPEARS THAT THE BETTER FAVORED AREAS FOR BETTER  
COUPLING OF THE LARGER SCALE AND MESOSCALE FORCING WILL BE ACROSS  
THE SOUTHERN HALF OF MY AREA. CURRENT ESTIMATES...SUCH AS THE  
GARCIA METHOD SUGGESTS THAT SNOWFALL AMOUNTS COULD APPROACH 5 OR 6  
INCHES ACROSS MY SOUTHERN COUNTIES...WITH A FEW INCHES POSSIBLE  
FARTHER NORTH. HOWEVER...MORE EXACT AMOUNTS WILL HAVE TO BE IRONED  
OUT AS WE GET A BETTER HANDLE ON ANY OF THE MESOSCALE ASPECTS OF  
THIS SYSTEM IN THE NEXT COUPLE DAYS. 

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I think we in Toronto have to be realistic. Remember that the storm on February 8th was one of the biggest synoptic snowstorms to hit the downtown Toronto area since the Second World War, with only 1944, 1966, 1992 and 1999 ranking up with it. 10-12" snowfalls are rare in Toronto. The models always show us getting a lot of snow - especially the NAM - only to have them back off as the system gets closer. I'm going with 2" with this one.

 

Yeah but you missed the most recent snowy winter, 2007-08, which did have storms above 12". 2000-01 was also a winter that featured some decent snowfall but i was only in Elementary school at that time so my memory aint that great, lol. 

 

On average, we often do see 6-10" events every Winter, with the outside chance of something greater. Seeing something in the 3-6" is most common by far. 

 

The latest Nam showed something far better than what other models depicted. If it were exploited further I would suspect 5-8" on the Nam in Toronto.  

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nicely done by RC from LOT

 

OTHERWISE...ATTENTION TURNS TO THE SYSTEM CURRENTLY ACROSS THE  

SOUTHWESTERN CONUS. MODEL GUIDANCE CONTINUES IN GOOD AGREEMENT IN A  

NORTHERN STREAM SYSTEM...CURRENTLY ACROSS THE EASTERN  

PACIFIC...DIGGING SOUTHEASTWARD ACROSS THE WESTERN CONUS AND  

ESSENTIALLY EJECTING THE SOUTHWEST SYSTEM OUT ACROSS THE SOUTHERN  

PLAINS BY EARLY FRIDAY. THIS LOOKS TO SUPPORT AN INVERTED GULF COAST  

SURFACE TROUGH ACROSS THE AREA INTO SATURDAY. IT APPEARS THAT A GOOD  

DEAL OF MOISTURE COULD LIFT NORTHWARD AHEAD OF THIS SURFACE  

TROUGH...SETTING UP GOOD ISENTROPIC ASCENT ACROSS A GOOD DEAL OF  

CENTRAL AND SOUTHERN ILLINOIS LATE FRIDAY AND FRIDAY NIGHT. THIS  

COULD RESULT IN THE DEVELOPMENT OF SNOW ACROSS MY SOUTHERN COUNTIES  

AS EARLY AS LATER FRIDAY AFTERNOON AND THEN SPREADING ACROSS MOST OF  

THE AREA BY FRIDAY EVENING.  

 

THIS SYSTEM IS STILL A COUPLE DAYS AWAY SO UNCERTAINTY...PARTICULARLY  

IN THE MESOSCALE ASPECTS OF THIS SYSTEM ARE STILL HIGH. AT THIS  

TIME...IT APPEARS THAT THE BETTER FAVORED AREAS FOR BETTER  

COUPLING OF THE LARGER SCALE AND MESOSCALE FORCING WILL BE ACROSS  

THE SOUTHERN HALF OF MY AREA. CURRENT ESTIMATES...SUCH AS THE  

GARCIA METHOD SUGGESTS THAT SNOWFALL AMOUNTS COULD APPROACH 5 OR 6  

INCHES ACROSS MY SOUTHERN COUNTIES...WITH A FEW INCHES POSSIBLE  

FARTHER NORTH. HOWEVER...MORE EXACT AMOUNTS WILL HAVE TO BE IRONED  

OUT AS WE GET A BETTER HANDLE ON ANY OF THE MESOSCALE ASPECTS OF  

THIS SYSTEM IN THE NEXT COUPLE DAYS. 

Good write up. 

 

1"-3" north of I-80 would be my guess.....

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5-8" looks pretty good for this weekend, great runs by the NAM. It has been much too long here that I've had to use a snowblower, have not the last two winters

 

Good Ol' Bowling Green, my place of origin.

I'd like to just use the shovel for the first time this season. Not much of a purpose to owning a snowblower here in the city.

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Gulf of Alaska LP stronger than what the 12Z GFS progged it to be at 18Z today...984 vs. 980 ..... not a ton...but considering it's only 6 hours into it's run....

 

 

It could be a resolution issue depending on what site you're using (NCEP is probably worst in that regard).  For instance the one I'm looking at for the 12z GFS had it at 982 mb for 18z.

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5-8" looks pretty good for this weekend, great runs by the NAM. It has been much too long here that I've had to use a snowblower, have not the last two winters

 

I'm hoping that you're right, but I'm being a little more pessimistic. 3"-5" is my call for NE IN and NW OH.

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