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December 13-14th Winter Storm


Chicago Storm

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Enhanced band of reflectivity has been quasi-stationary over Kankakee county Illinois for a couple hours. 

 

About 2 inches at my house now. I've been on the northern fringe of that band.  Friend in Herscher is guessing close to 3" there now under that band.  

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For the RAP followers...

 

Wettest run yet for around Chicago. 0.40" near ORD and 0.50" near downtown.

 

4mxf.png

 

Hopefully that second slug of precip enhancement pivots northward and impacts you guys later tonight and early tomorrow.  Looking like at least the southern half of the Chicago metro should do real well with this.

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MCD...

 

 

   MESOSCALE DISCUSSION 2078
   NWS STORM PREDICTION CENTER NORMAN OK
   1131 PM CST FRI DEC 13 2013

   AREAS AFFECTED...SOUTHWEST THROUGH CENTRAL MISSOURI INTO WEST
   CENTRAL ILLINOIS

   CONCERNING...HEAVY SNOW

   VALID 140531Z - 141030Z

   SUMMARY...A SWATH OF MODERATE SNOW...WITH LOCAL SNOWFALL RATES UP TO
   1 INCH PER HOUR POSSIBLE...IS EXPECTED LATER TONIGHT THROUGH EARLY
   SAT FROM PARTS OF SW MO ENE THROUGH THE MO OZARKS TO E CNTRL MO/W
   CNTRL IL.

   DISCUSSION...LATEST SATELLITE DATA SHOW VORT MAX ASSOCIATED WITH SRN
   PLNS SHORTWAVE TROUGH BECOMING BETTER DEFINED ATTM OVER NE OK AS THE
   TROUGH TEMPORARILY ASSUMES A MORE NEUTRAL TILT BEFORE IT BECOMES
   ABSORBED WITHIN DOWNSTREAM CONFLUENT FLOW OVER THE OH VLY LATER SAT.

   ASCENT AND MID-LVL COOLING WITH THE VORT SHOULD ELIMINATE DEEP WARM
   LAYER OVER THE REGION SHOWN BY THE 00Z SGF SOUNDING...WITH COOLING
   LIKELY BEING SUFFICIENT TO CHANGE EXISTING PRECIPITATION TO
   SNOW...ESPECIALLY ALONG ZONE OF STRONGEST ASCENT ASSOCIATED WITH THE
   VORT. ENEWD ADVANCE OF THE VORT SHOULD ALSO STRENGTHEN EXISTING
   DIFFUSE 850-700 MB FRONTAL ZONE EXTENDING ENE THROUGH CNTRL AND ERN
   MO...THEREBY ENHANCING FRONTOGENETIC FORCING/UPLIFT.

   COMBINATION OF FOCUSED ASCENT WITHIN AN AMPLY MOIST ENVIRONMENT MAY
   YIELD A NARROW SWATH OR TWO OF MODERATE TO LOCALLY HEAVY SNOW...WITH
   RATES UP TO 1 IN/HR POSSIBLE...BEFORE THE VORT REACHES THE MS RVR
   TOWARD 12Z SAT. WEAK ELEVATED CONVECTION /LIKELY BASED NEAR 700 MB/
   MAY FURTHER CONTRIBUTE TO LOCALLY ENHANCED SNOWFALL RATES.
 

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Not gonna happen. Good bands are few and far between up here

It has better precip expand in from the south a few hours from now.

 

The HRRR and RGEM agree.

 

Not saying it's going to happen...but I'm not saying isn't going to happen either.

How did the RAP do with the overperformer last Sunday? I was too busy collecting snow reports to see how guidance was doing.

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PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1030 PM CST FRI DEC 13 2013

1029 PM     SNOW             1 SE KEOKUK             40.40N 91.39W
12/13/2013  M5.5 INCH        LEE                IA   TRAINED SPOTTER

            LIGHT SNOW CONTINUES
 

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1200 AM     SNOW             OHARE AIRPORT           41.98N 87.90W
12/14/2013  M0.2 INCH        COOK               IL   OFFICIAL NWS OBS

            0.01 LIQUID EQUIVALENT.

1200 AM     SNOW             3 SW MIDWAY AIRPORT     41.75N 87.79W
12/14/2013  M0.9 INCH        COOK               IL   CO-OP OBSERVER

            0.06 LIQUID EQUIVALENT.
 

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Beachler....

 

 

//DISCUSSION...UPDATED 06Z...

WINTER STORM CONTINUES TO ROTATE ACROSS THE REGION...SPREADING LGT
SNOW ACROSS NORTHERN IL/NORTHWEST IN AIRFIELDS. THE IFR CONDS HAVE
BEEN HOLDING FURTHER SOUTH OF ORD AT MDW...HOWEVER EXPECT OVER THE
NEXT COUPLE OF HOURS THIS LINE TO LIFT NORTH AND ORD WILL SEE IFR
CONDS DEVELOP. GUIDANCE CONTINUES TO INDICATE A BURST OF MODERATE
TO POSSIBLY A BRIEF HVY SNOW BETWEEN 08-11Z
. IFR CONDS WILL THEN
PREVAIL AT MOST TAF SITES...WITH THE EXCEPTION OF RFD WHICH WILL
REMAIN JUST NORTHWEST OF THE STEADIER SNOW. AS THE LOW PRESSURE
LIFTS NORTHEAST...WINDS WILL STEADILY TURN NORTHEAST THEN
NORTHWEST. AS WINDS TURN NORTHEAST TO NORTHWEST THE PRECIP WILL
STEADILY PUSH EAST...AND BRING A SLOW IMPROVEMENT TO THE IFR CONDS
TO MVFR CIGS BY 00Z SUN.

BEACHLER
 

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