AREAS AFFECTED...NRN IL TO SRN IND
CONCERNING...WINTER MIXED PRECIPITATION
VALID 220146Z - 220545Z
SUMMARY...MODERATE TO LOCALLY HEAVY SNOW WILL SPREAD ACROSS CNTRL
INTO NRN IL AND PORTIONS OF NRN IND LATE THIS EVENING WITH SNOW
RATES GENERALLY LESS THAN ONE INCH PER HOUR. A MIX OF SLEET AND
FREEZING RAIN IS EXPECTED ACROSS MUCH OF CNTRL INTO SRN IND.
DISCUSSION...NRN PLUME OF WARM CONVEYOR BELT IS SPREADING NORTH
ACROSS IL/IND WHILE THE MAIN CORRIDOR OF WARM ADVECTION GRADUALLY
SHIFTS EAST INTO THE LOWER OH VALLEY. SIGNIFICANT WARMING IS
EXPECTED TO RESULT IN A SNOW TO SLEET TO FREEZING RAIN EVENT ACROSS
CNTRL/SRN IND AS INTENSE LLJ FOCUSES ACROSS THIS REGION LATER THIS
EVENING. LATEST OBSERVATIONAL TRENDS SUGGEST THIS IS OCCURRING WITH
NUMEROUS REPORTS OF SLEET AND FREEZING RAIN NOW REPORTED ACROSS THIS
REGION.
SLEET/SNOW LINE MAY ULTIMATELY ESTABLISH ITSELF FROM NEAR CMI IN
ECNTRL IL TO LAF TO FWA OVER IND. MODERATE TO LOCALLY HEAVY SNOW IS
EXPECTED TO DEVELOP/SPREAD NWD ACROSS IL AND NWRN IND WHERE HALF
INCH TO PERHAPS ONE INCH PER HOUR RATES MAY BE OBSERVED FOR A FEW
HOURS. THIS WARM ADVECTION BAND OF PRECIPITATION WILL GRADUALLY
SHIFT NORTH TOWARD SRN WI/LOWER MI AFTER MIDNIGHT WHERE PROFILES
WILL BE SUFFICIENTLY COOL FOR SNOW MAINTENANCE.
..DARROW.. 02/22/2013
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...ILN...IWX...IND...LOT...ILX...DVN...
LAT...LON 42069027 41768820 40878638 39088451 38828651 40138830
41149079 42069027
