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Winter 2014-15 Short Term Discussion


Chicago Storm

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nice pics guys!

 

a dusting in spots is all that is visible here this morning...but the ground is certainly starting to freeze over...

 

hourly has single digit lows Tuesday morning and double digit below zero windschills

 

Some flurries flying around...that make 4 straight days with at least flurries...and that looks to continue through at least Wednesday

 

7 straight days of flurries or better isn't bad for mid November for mby

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A thing of beauty.

 

MODEL QPF CONSENSUS ALONG WITH SNOW RATIOS BASED ON BOUNDARY LAYER
TEMPERATURES SUGGESTING A GENERAL 2-4 INCH SNOWFALL FORECAST.
ALTHOUGH
...DEPENDING ON THE AMOUNT OF WARM AIR THAT WRAPS INTO THE
AREA THESE NUMBERS COULD BE A TOUCH HIGH...ESPECIALLY ACROSS EASTERN
AREAS.

THE SYNOPTIC PRECIPITATION IS EXPECTED TO DIMINISH FROM WEST TO EAST
MONDAY AFTERNOON AS THE STRONG SURFACE COLD FRONT MAKES IT WAY
ACROSS THE ACROSS. STRONG COLD AIR ADVECTION IN WAKE OF THE FRONT
WILL CAUSE TEMPERATURES TO TURN SHARPLY COLDER AND WESTERLY WINDS TO
INCREASE. THIS WILL BEGIN THE LAKE EFFECT SNOWS IN EARNEST.

LAKE EFFECT MONDAY NIGHT THROUGH WEDNESDAY MORNING...THE ARCTIC AIR
THAT WILL BE DRIVEN ACROSS THE EASTERN GREAT LAKES DURING THIS
PERIOD WILL BE QUITE COLD FOR MID NOVEMBER WITH 850 MB TEMPERATURES
DROPPING TO -14C TO -16C...SOME 2 TO 3 STANDARD DEVIATIONS BELOW
NORMAL.
THE INITIAL LOW LEVEL FLOW SET UP WILL BE FAVORABLE FOR A
DOMINATE WEST-SOUTHWEST SNOW BAND OFF BOTH LAKE ERIE AND LAKE
ONTARIO. THE PASSAGE OF A SURFACE TROUGH LATE TUESDAY AND TUESDAY
NIGHT WILL VEER THE FLOW SLIGHTLY TO WESTERLY.

VERY IMPRESSIVE OMEGA WITHIN FAVORABLE DENDRITIC GROWTH ZONE SHOWN
ON BUFKIT OVERVIEWS. PROFILES SUCH AS THESE OFTEN ARE SIGNALS FOR
INTENSE SNOWFALL RATES IN EXCESS OF 3 INCHES PER HOUR WITH THE HIGH
LIKELIHOOD OF THUNDER AND LIGHTING
. SNOWFALL TOTALS DURING THIS
PERIOD SHOULD BE RATHER IMPRESSIVE AND LIKELY OF SUBSTANTIAL IMPACT.

IN ADDITION...MOMENTUM TRANSFER PROFILES WOULD SUGGEST WIND GUSTS
COULD EXCEED 35 MPH ENHANCING IMPACTS WITH CONSIDERABLE BLOWING AND
DRIFTING SNOW AND SIGNIFICANT VISIBILITY RESTRICTIONS.


BY THE TIME WE GET INTO WEDNESDAY...A CLIPPER-TYPE SYSTEM SHOULD BE
RAPIDLY APPROACHING THE REGION...WITH THIS FEATURE AND ITS ATTENDANT
SYNOPTIC SNOWS REACHING THE AREA DURING THE AFTERNOON. IN THE
PROCESS...THIS SYSTEM SHOULD FORCE A RAPID BACKING OF THE WINDS
WHILE ALSO INTRODUCING A SIGNIFICANT INCREASE IN SHEAR WEDNESDAY
MORNING...BOTH OF WHICH SHOULD LEAD TO THE LAKE SNOWS QUICKLY
SHIFTING TO AREAS NORTH-NORTHEAST OF THE LAKES AND DRAMATICALLY
WEAKENING BY MIDDAY...BEFORE GIVING WAY TO MORE GENERAL LIGHT SNOW
SHOWERS DURING THE AFTERNOON.

&&

.LONG TERM /WEDNESDAY NIGHT THROUGH SATURDAY/...
FOLLOWING THE PASSAGE OF WEDNESDAY`S CLIPPER SYSTEM...ANOTHER
SIGNIFICANT SHOT OF COLDER AIR WILL OVERSPREAD THE REGION
FOR THE
BALANCE OF THE WORK WEEK. COUPLED WITH WHAT SHOULD BE SUFFICIENT
MOISTURE...THIS WILL IN ALL LIKELIHOOD RESULT IN A SECOND ROUND OF
SIGNIFICANT LAKE SNOWS EAST-NORTHEAST AND/OR EAST OF THE LAKES
WEDNESDAY NIGHT THROUGH THURSDAY NIGHT..
.WITH LAKE ONTARIO PERHAPS
HAVING THE MORE FAVORABLE SETUP DURING THIS TIME FRAME.

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I picked up a nice 3.2" of very fluffy snow later yesterday and overnight.  The liquid precip total is only 0.14".  A 23 to 1 snow to water ratio is pretty extreme for mid November.

 

Wow, a nice start to the winter for you.  Finished with 1.2" here.  Just warm enough that some of the snow has melted back enough to show the grass more than it had earlier.

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Interesting how banded the snowfall was last night, expected more of a broadbrush light to moderate snow band spanning much of Southern Wisconsin, ended up just north of the best stuff, but still received around an inch (while MKE reported 1.7") so I'll take it.

 

It was kind of odd how that worked out. If you weren't under the "green" shades on the radar for most of the event, you didn't do so great. It was amazing how dry that snowfall was for mid-November.

 

Operational GFS showing this in the next 96 hours.

 

 gfs_asnow_ncus_17.png

 

Edit: GGEM showing 3" amounts locally now.

 

gem_asnow_ncus_16.png

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MKX on the Clipper:

 

 

NAM CROSS SECTIONS YIELD A PERIOD OF OMEGA OCCURRING IN THE
FAVORABLE DENDRITIC GROWTH ZONE WHICH ALSO INTERSECTS A BURST OF
FRONTOGENETICAL FORCING.  SNOW TO LIQUID RATIO OF AROUND 20 TO 1
DURING THIS PERIOD.  HENCE DESPITE LESS THAN A TENTH OF AN INCH OF
QPF...MOST AREAS LIKELY TO RECEIVE 1 TO 2 INCHES OF DRY SNOW BY MID-
MRNG WED.  THIS SNOW WL HAVE A GREATER IMPACE AND AFFECT WED MRNG
RUSH HOUR. WL MENTION IN HWO FOR NOW. -SN WILL TAPER OFF FROM WEST
TO EAST LATE TUE NGT THRU WED MRNG AS WARM AIR SURGE AND SHARP TROF
AXIS SHIFT TO THE EAST.
 

 

LOT

 

 

LARGE SCALE UPPER TROUGH AXIS MOVES EAST OF THE AREA TUESDAY NIGHT.
AS INDICATED ABOVE HOWEVER...ANOTHER MID-LEVEL SHORT WAVE APPROACHES
QUICKLY IN NORTHWEST FLOW TUESDAY NIGHT WITH RESULTING BACKING OF
LOW LEVEL FLOW AND ASSOCIATED WARM ADVECTION BRINGING THE POTENTIAL
FOR A PERIOD OF ACCUMULATING LIGHT SNOW AFTER MIDNIGHT INTO
WEDNESDAY MORNING. MODEL QPF AMOUNTS GENERALLY LIGHT WITH THIS
CLIPPER-TYPE SYSTEM...THOUGH COLD COLUMN SUPPORTS SNOW/LIQUID RATIOS
15-20:1 WHICH COULD SUPPORT AN INCH OR MORE OF LIGHT SNOW ACROSS
PARTS OF FAR NORTHERN/NORTHEAST IL EARLY WEDNESDAY BEFORE TROUGH
MOVES THROUGH AND COLUMN DRIES OUT.

 

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