SWOMCD
SPC MCD 201328
INZ000-ILZ000-201630-
MESOSCALE DISCUSSION 0045
NWS STORM PREDICTION CENTER NORMAN OK
0728 AM CST TUE JAN 20 2009
AREAS AFFECTED...SOUTH SHORE LAKE MICHIGAN
CONCERNING...HEAVY SNOW
VALID 201328Z - 201630Z
HEAVY LAKE EFFECT SNOW BAND WILL LIKELY PERSIST ACROSS THE SRN PART
OF LAKE MICHIGAN AND ADJACENT SOUTH SHORE COUNTIES IN NWRN IND
THROUGH 18Z.
TIME LAPSE RADAR MOSAIC SHOWS THIS MORNING DEPICTS A SINGLE N-S
ORIENTED BAND EXHIBITING CONVECTIVE ELEMENTS HAS BECOME BETTER
DEFINED IN THE PAST FEW HOURS OVER SRN LAKE MICHIGAN AND LAKE COUNTY
IND. 12Z AREA RAOBS AND KLOT VWP DATA INDICATE UNIDIRECTIONAL NLY
FLOW THROUGH 2KM AND GYY RUC SOUNDING IMPLIES A NEAR SATURATED LAYER
SFC-800MB. PLAN VIEW/FORECAST SOUNDING PROFILES SHOW LITTLE CHANGE
IN BOUNDARY LAYER FLOW THROUGH 18Z...IMPLYING ONLY SLIGHT EWD
MOVEMENT IN PRIMARY SNOWFALL BAND DURING THIS PERIOD. HEAVY
SNOWFALL RATES UP TO 2 INCHES/HR ARE POSSIBLE OVER NRN LAKE AND NWRN
PORTER COUNTY IND /INCLUDING PARTS OF I-80/94 AND I-90/ THROUGH 18Z.
..SMITH.. 01/20/2009
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
...NOTICE...
SPC WINTER WEATHER MESOSCALE DISCUSSIONS WILL BE ISSUED ON A
SCHEDULED BASIS FROM DECEMBER 1 THROUGH FEBRUARY 28...FOUR
TIMES A DAY...AROUND 00 UTC...06 UTC...12 UTC...AND 18 UTC
FOR SIGNIFICANT SHORT RANGE WINTER WEATHER EVENTS.
ATTN...WFO...LOT...
LAT...LON 41538756 41728755 41998750 42078745 42198736 42218722
42168712 41988708 41648706 41488710 41438723 41428739
41448745 41538756
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