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December 8-9th Winter Storm


Chicago Storm

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Ok, thanks for weighing in, you think the Euro will cut back to 1/3-1/2 of what it has now.

 

 

I have no idea what the Euro will do over the next half dozen runs but this will be a minor event IYBY...look at the 850 maps, crapp ULL, and sorry moisture transport. Nothing about this says 3-6".

 

And lake enhancement will be a non-factor.

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Latest MKX disco on the snow situation. Still holding their ground.

 

 

.LONG TERM...SUNDAY THROUGH WEDNESDAY...FORECAST CONFIDENCE IS
MEDIUM TO HIGH.

GFS/ECMWF CONTINUE TO SHOW ACCUMULATING SNOW POTENTIAL FOR LATER
SUNDAY THROUGH LATE SUNDAY NIGHT/EARLY MONDAY MORNING ACROSS THE
AREA. THEY BRING LOW LEVEL WARM AIR ADVECTION INTO THE AREA
SUNDAY...WITH STRONG 500MB VORTICITY MAXIMA THROUGH THE AREA
SUNDAY NIGHT. DECENT 700 MB TO 500 MB FRONTOGENESIS PASSES THROUGH
THE FAR SOUTHEASTERN PORTIONS OF THE AREA SUNDAY NIGHT ON THE GFS.
GFS FORECAST SOUNDINGS SHOWING A SATURATED AIR COLUMN LATER SUNDAY
THROUGH SUNDAY NIGHT. GOOD UPWARD VERTICAL MOTION IN THE DEEP
DENDRITE SNOW GROWTH ZONE IS ALSO SEEN...BEST AND DEEPEST ON
SUNDAY NIGHT.

WILL CONTINUE HIGH POPS FOR SUNDAY NIGHT...TRENDING UPWARD SUNDAY
AND DOWNWARD MONDAY MORNING. COLD AIRMASS IN PLACE DURING THIS
TIME SHOULD KEEP SNOW TO LIQUID RATIOS FROM THE 18 TO 1 TO THE 20
TO 1 RANGE. LIQUID EQUIVALENT AMOUNTS IN THE 0.20 TO 0.30 INCH
RANGE SUGGEST SNOWFALL AMOUNTS OF 3 TO 6 INCHES POSSIBLE. STAY
TUNED TO LATER FORECASTS FOR MORE INFORMATION. WILL CONTINUE
MENTION SNOW LIKELIHOOD IN HAZARDOUS WEATHER OUTLOOK. COLD
TEMPERATURES WILL LINGER SUNDAY INTO MONDAY...WITH A REINFORCING
PUSH OF COLD AIR ADVECTION MONDAY.

 

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Ratios should be close to 20:1 if not better in the area that has the really deep DGZ (parts of IA-WI).  That is going to be the bailout in an event that doesn't have a lot of moisture.  Farther south gets more questionable with lower ratios and I would think a widespread 1-3 with maybe some isolated higher amounts.

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Yeah I am pretty sure that is.

 

A bit low based on this and the temp profile.

 

gfs_total_precip_east_20.png

 

I honestly haven't been that impressed with the snow maps from there (from what I've seen).  The graphics are pretty and all but it seems like it has issues with calculating amounts when ice is involved and then in cases like this where ratios will be higher.  The Kuchera map is probably more realistic as it's not a straight 10:1 across the board. 

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