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Nov. 25th-26th Midwest Snowstorm Potential


Malacka11

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Just now, cyclone77 said:

Glad to have you back in the sub.  It's just like the old days lol.  :beer:

Still raining moderately with the temp down to 34 here.  

I need to be better :lol:

This storm provided a great opportunity to sneak back in.

At this point, the RAP timing on the flip will be within an hour. Not bad.

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One thing to watch out for in the Detroit area is how well/long does the upper level low remain closed off, and if it at least tracks over/south of the city.

If it does remain closed off and the aforementioned track does happen, could see dynamic cooling flipping over the precip to snow much more quickly and producing a few surprise inches.

12z GFS/NAM/GGEM are all close to showing this outcome.

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AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE LINCOLN IL  
1054 AM CST SUN NOV 25 2018  
   
UPDATE  
  
ISSUED AT 1054 AM CST SUN NOV 25 2018  
  
AFTER ANALYZING 12Z DATA AND SHORT TERM MODELS, WILL BE MAKING  
SOME ADJUSTMENTS TO THE FORECAST REGARDING THE IMPENDING WINTER  
STORM. MODELS HAVE HONED IN ON STRONG SURFACE LOW TRACKING FROM  
NORTH OF STL TO NEAR DANVILLE TONIGHT. TIMING IS A LITTLE SLOWER,  
DELAYING CHANGEOVER TO SNOW UNTIL LATE AFTERNOON FAR NW, AND LATER  
IN THE EVENING TOWARDS THE I-55 CORRIDOR. THE SYSTEM DOES APPEAR  
SLIGHTLY STRONGER SO EVEN WITH THE LATER CHANGEOVER HEAVY SNOW  
WILL STILL AFFECT THE NORTHWEST CWA. WIND GUSTS WILL ALSO BE  
HIGHER WITH UP TO 40 KTS NOW IN THE GRIDS. TREND HAS ALSO BEEN FOR  
A SLOWER DEPARTURE OF THE DEFORMATION ZONE ACROSS THE NORTH AFTER  
06Z, SO ACCUMULATING WILL BE LIKELY THERE AFTER MIDNIGHT. WITH ALL  
OF THESE FACTORS IN PLAY SNOW TOTAL HAVE BEEN RAISED TO 6-10"  
ACROSS KNOX AND STARK COUNTIES, WITH 4" ACCUMULATIONS SOUTH TO A  
RUSHVILLE TO ROANOKE LINE. AMOUNTS WILL QUICKLY DROP OFF FARTHER  
SOUTHEAST WITH AN INCH OR TWO FORECAST NEAR THE I-55 CORRIDOR. AS  
COLD ADVECTION INCREASES THIS EVENING THE SNOW WILL BECOME DRIER  
IN NATURE WHICH WILL CREATE MORE OF A BLOWING AND DRIFTING ISSUE  
WITH GUST OVER 40 MPH. WHITEOUT TO NEAR BLIZZARD CONDITIONS WILL  
BE POSSIBLE FOR SEVERAL HOURS THIS EVENING INTO THE OVERNIGHT,  
ESPECIALLY FOR AREAS NW OF THE IL RIVER. WILL BE MAKING SOME   
DECISIONS SOON AFTER COORDINATION WITH SURROUNDING OFFICES   
REGARDING HEADLINE ADJUSTMENT. PLAN TO HAVE UPDATED WSW AND ZFP  
OUT BY NOON.  

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Just now, ILwxchr said:

MD out for blizzard conditions now. ILX said they are coordinating with other offices on potential headline changes. Not sure if that means upgrade to blizzard warning or not.

I suspect they may add some counties to the winter storm warning south of the current one (like peoria county)

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3 minutes ago, janetjanet998 said:

I suspect they may add some counties to the winter storm warning south of the current one (like peoria county) 

Agreed. Their afd mentioned the more southern track and stronger low pressure. They said they increased grids to 40 knots (50 mph). I don't see why they wouldn't upgrade to blizzard warning based on that.

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6 minutes ago, ILwxchr said:

MD out for blizzard conditions now. ILX said they are coordinating with other offices on potential headline changes. Not sure if that means upgrade to blizzard warning or not.

I think it's a bit of everything going on right now. Given the narrowness of the band, some counties will probably get trimmed from warnings to advisories, warnings may be added to SE zones, etc.

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I think we're really about to go to town here in eastern IA. There is that area of precip (over IL) moving north towards the main band. That area is lower level lift, associated with 850 mb f-gen. It's moving relative the 700 mb f-gen, which is stationary. Once the two collocate, the lift will be even stronger with that band (hence hi-res model guidance flashing over to heavy snow).

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Still more spread in the fine details than I would like to see at this point, but after weighing everything I am coming up with 3 or 4 inches here.  I think what's also holding me from going any higher is that I've never really witnessed so much rain preceding a more significant snowfall.  This area could get around an inch of rain before the changeover occurs, and then have to deal with compaction, melting, etc. since it won't be a quick drop below freezing.  I am not expecting the changeover time until around 11 pm-1 am.  If it happens before then, better shot to go over 4"...

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Blizzard Warnings going up for Adams County, IL on the north end of LSX county warning area. Starting to get some graupel to mix in here in Davenport. Going to head up toward Park View area shortly once the new products drop to see what is going on. Iowa City already looks pretty snow covered.

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ILX  webpage

 

11 am Update -- We have increased the snowfall amounts for areas from about Rushville to Bloomington northward. Totals of 5-6 inches are likely around the Peoria metro area, with 8 inches around Galesburg and Lacon. Blizzard conditions are likely in some areas west of the Illinois River this evening, as winds increase to around 40-45 mph. Any travel into this area should be done before about mid afternoon.

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