The Pumpkin Pie Event Dec.1-2, 2025

[Baum]

Let’s keep it rolling. Why not.
Per Lot:

EXPECTATIONS ARE THAT TOP-DOWN SATURATION WILL RESULT IN A   PERIOD OF LIGHT SNOW SPREADING WEST TO EAST OVER THE ENTIRE   AREA, REACHING THE I-39 CORRIDOR BY MID-AFTERNOON AND THE   CHICAGO METRO AND NORTHWEST INDIANA BY LATE AFTERNOON. MOST   GUIDANCE HAS BEEN CONSISTENT IN GENERATING QPF GENERALLY IN THE   0.15-0.20 INCH RANGE, WITH HIGHER AMOUNTS OF AT LEAST 0.25 INCH   IN THE BROADER ENSEMBLE ENVELOPE SOUTH OF I-80. MEANWHILE, A 3KM   DEEP DGZ INTERSECTING WITH MOST OF THE MID-LEVEL ASCENT WOULD   SUPPORT A HIGHER RATIO SNOWFALL ON THE ORDER OF 15:1 TO EVEN   20:1. PUTTING THIS TOGETHER, A WIDESPREAD FLUFFY SNOW EVENT OF   1-3" NORTH OF I-80 AND 2-4" SOUTH OF I-80 APPEARS LIKELY. HAVE   SOME CONCERNS THAT THE 600 HPA F-GEN NOTED ABOVE WILL FOCUS A   NARROW (COUNTY-WIDE) WSW TO ENE ORIENTED BAND OF HIGHER QPF AND   HIGHER SLR (>20:1) SOUTHEAST OF I-55 IN THE EVENING. IN THIS   CASE, IT IS FEASIBLE THAT A NARROW 4-6" BAND OF SNOW WILL BE   REALIZED. FINALLY, WHILE NOT EXPECTED (10% CHANCE), SYNOPTIC   ENHANCEMENT OF A DEVELOPING MESO-LOW OVER SOUTHERN LAKE MICHIGAN   TONIGHT COULD BACK CLOSE TO THE ILLINOIS SHORE AS THE LOW-LEVEL   SYNOPTIC FLOW TURNS SSE EARLY MONDAY EVENING. WILL THEREFORE   NEED TO MONITOR FOR LOCALLY HIGHER SNOWFALL TOTALS ALONG THE   IMMEDIATE SHORE FROM DOWNTOWN CHICAGO TO THE IL/WI LINE.  

[ChiTownSnow]

Here's to hoping that lake helps us this time

[sbnwx85]

Looks like a solid 2-4” out this way.

[Chambana]

I’ll take a 1-4” snowpack refresher tomorrow night. This glacier is gonna be around for a hot minute. 

[Spartman]

This thread should actually be extended to December 2nd (Tuesday) since it would last through at least that said morning.

Not much on the 12z Euro:

A bit juicy on the 00z NAM:

So-so on the 18z GFS:

[KeenerWx]

Still looking good locally for 2-4”. Hopefully someone cashes in on some fgen magic.
 

These smaller events are fun in their own way. 

[Jackstraw]

2 hours ago, KeenerWx said:

Still looking good locally for 2-4”. Hopefully someone cashes in on some fgen magic.
 

These smaller events are fun in their own way. 

These are the kind that can jump out and "scare" someone with an unexpected 6 inches. Certainly will give the rest of us a chance to pack match the last systems winners lol. Load me up with chips, I'm calling 4 for here! 

[michsnowfreak]

Im hoping for 2" of powder to cover up the 2" frozen crust. Will work wonders. Not sure how good ratios will be, but with temps in the mid 20s at least I know it won't be wet cement again.

Anywhere that was plowed is literally like a boulder that could kill now. 

[cyclone77]

Being on the northern portion of the system you kind of worry this could bump a bit south and be just a dog turd duster, but we seem to be holding in the 0.12-0.17 range for precip.  1-2" refresher looking pretty likely here.

[A-L-E-K]

couple inches of evening mood dust hits better when it's falling onto a snowpack

[IWXwx]

With ratios looking to be up to 20:1, my call is 4.5" here.

[SchaumburgStormer]

8 hours ago, cyclone77 said:

Being on the northern portion of the system you kind of worry this could bump a bit south and be just a dog turd duster, but we seem to be holding in the 0.12-0.17 range for precip.  1-2" refresher looking pretty likely here.

HRRR wants to do exactly that, and make this an I70 special