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November 20-21 Early Season Snowstorm


Hoosier

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Tonight at the office Gino looked up the November 2004 pre Thanksgiving snowstorm. ORD had 4.2" of snow for the event and 0.88" of liquid equivalent. Surface temperatures were pretty similar to what we're predicting for this event and there were several 1/2 1/4 mile obs. Even if the big qpf amounts verify, wonder how much of a role the SLR will play in accums.

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Tonight at the office Gino looked up the November 2004 pre Thanksgiving snowstorm. ORD had 4.2" of snow for the event and 0.88" of liquid equivalent. Surface temperatures were pretty similar to what we're predicting for this event and there were several 1/2 1/4 mile obs. Even if the big qpf amounts verify, wonder how much of a role the SLR will play in accums.

Sent from my SM-G900V

 

 

Every degree will be crucial...heck, every half of a degree.  :lol: 

 

One thing I like about this one compared to 2004 is the evening onset.  Can't hurt anyway.

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We're not necessarily riding down easy street on our end either... :ee:

 

Yes, you also!  ;)

 

---

 

Was just looking at the 11/24/04 event. Difference with that one was it started during the middle of the day. Winds had been moving off the lake from the NNE at 15-20 mph all day too (gusts to 30mph).

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Hey RC, Midway had 1.9" on 0.75" liquid in that November 2004 storm. :yikes:

Damn. Was that as measured by the MDW COOP?

We went less than 3" downtown, but still over 5" in our official forecast for MDW and 6.4" at ORD. I think the city proper holds some pretty big bust potential.

Also, regarding time of day, a lot of the heavier rates happening overnight and early Saturday certainly won't hurt. But sun angle is low/equivalent to late January this time of year, so maybe more of a muted impact.

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Hopefully the air mass overhead will be colder this time around then on 11/24/04.

At least we're not having a soaking rain then a transition to snow. Going into a snow event with wet ground usually does hold back accumulations.

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WPC so far perfers the 0Z GFS

...DEEPENING SURFACE LOW/UPPER TROUGH OVER THE MIDWEST/GREAT

LAKES...

PREFERENCE: 00Z GFS

CONFIDENCE: AVERAGE

RATHER SIGNIFICANT DIFFERENCES REMAIN WITH THE EVOLUTION OF

SURFACE LOW PRESSURE EJECTING ACROSS THE CENTRAL PLAINS ON FRI AND

THEN MOVING THROUGH THE MID MS VALLEY AND LOWER GREAT LAKES REGION

THROUGH SAT. THE 12Z UKMET IS OVERALL THE MOST AMPLIFIED SOLUTION

WITH THIS SYSTEM AND FARTHEST TO THE LEFT WITH THE SURFACE LOW

TRACK AND ESPECIALLY AS IT LIFTS THROUGH THE GREAT LAKES REGION.

THE 12Z ECMWF JUST LIKE ITS 00Z RUN IS FARTHEST SOUTH AND IS

CURRENTLY THE WEAKEST SOLUTION. THE 00Z NAM/00Z GFS AND 12Z CMC

SPLIT THE DIFFERENCE...BUT THE 00Z GFS AS WITH PREVIOUS RUNS HAS

BEEN CONSISTENT IN BEING MORE AMPLIFIED AND IS ONLY A TAD WEAKER

AND A BIT SOUTHEAST OF THE UKMET TRACK. THE 00Z NAM HAS TRENDED

STRONGER AND IS SUPPORTED BY THE 12Z CMC WITH A TRACK THAT IS IN

BETWEEN THE 12Z ECMWF AND 00Z GFS. THE 18Z GEFS MEAN IS GENERALLY

VERY SUPPORTIVE OF THE 00Z GFS...AND THE 12Z ECENS MEAN IS

ACTUALLY SOMEWHAT NORTH OF THE 12Z ECMWF TRACK AS THE LOW CENTER

MOVE THROUGH THE LOWER GREAT LAKES. WILL PREFER TO GO WITH THE

MODEL CONSENSUS WHICH AT THIS POINT WOULD BE A SOLUTION CLOSE TO

THE 00Z GFS.

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Damn. Was that as measured by the MDW COOP?

We went less than 3" downtown, but still over 5" in our official forecast for MDW and 6.4" at ORD. I think the city proper holds some pretty big bust potential.

Also, regarding time of day, a lot of the heavier rates happening overnight and early Saturday certainly won't hurt. But sun angle is low/equivalent to late January this time of year, so maybe more of a muted impact.

 

 

Yeah it was the COOP.

 

I don't envy you guys at all in trying to figure out just how pronounced the marine influence will be.  There's reason to think it won't be as big of a limiting factor/won't extend as far inland as 2004 (namely that winds are weaker this time).  The thermal profiles aloft with this system look fairly similar to 2004 but I'd say this system may be a little cooler.

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