ACUS11 KWNS 081015
SWOMCD
MESOSCALE DISCUSSION 1968
NWS STORM PREDICTION CENTER NORMAN OK
0415 AM CST MON DEC 08 2014
AREAS AFFECTED...SERN WI...FAR NRN IL
CONCERNING...FREEZING RAIN
VALID 081015Z - 081345Z
SUMMARY...SPATIAL EXTENT OF LIGHT FREEZING RAIN SHOULD DECREASE
DURING THE MORNING COMMUTE HOURS...BUT RATES OF .02-.08 IN/HR SHOULD
PERSIST THROUGH AT LEAST 13Z FROM JUST S OF GREEN BAY TO BETWEEN
ROCKFORD AND WESTERN CHICAGOLAND.
DISCUSSION...LOW-LEVEL WAA-DRIVEN MIXED PRECIPITATION EXISTS WITHIN
A BAND FROM NEAR KGRB TO NWRN IL. AMDAR DATA INVOF KMDW AT 0730Z
STILL SAMPLED A RATHER DRY SUB-CLOUD LAYER...ALSO EVIDENT IN 00Z
GRB RAOB...WHICH WILL CONTINUE TO SLOW THE EWD PROGRESSION OF THIS
PRECIPITATION BAND THROUGH THE MORNING. HOWEVER...SURFACE
TEMPERATURES OF 29-32 DEG F WERE EVIDENT IMMEDIATELY AHEAD OF THE
BAND...WHICH SHOULD SUPPORT PERSISTENCE OF FREEZING RAIN EVEN AS
LOW-LEVEL TEMPERATURES COOL THROUGH WET-BULB EFFECTS. THE GREATEST
ICE ACCRETION SHOULD LARGELY REMAIN IN WI /AS CONFIRMED BY ASOS
ICING ESTIMATES REF 10Z KOSH/KMSN OBS/...BUT LIGHT ICING MAY OCCUR
AS FAR SE AS THE WRN CHICAGOLAND SUBURBS DURING THE MORNING COMMUTE.
..GRAMS.. 12/08/2014
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...GRB...LOT...MKX...
LAT...LON 43998858 44288832 44248810 44058803 42998812 42228812
41868821 41598897 41658929 41968943 43218923 43278922
43948874 43998858
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