ZCZC SPCSWOMCD ALL
ACUS11 KWNS 100130 
SPC MCD 100130 
INZ000-100230-

MESOSCALE DISCUSSION 1671
NWS STORM PREDICTION CENTER NORMAN OK
0830 PM CDT FRI SEP 09 2016

AREAS AFFECTED...PORTIONS OF CNTRL/NRN IND

CONCERNING...TORNADO WATCH 472...

VALID 100130Z - 100230Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 472 CONTINUES.

SUMMARY...AN ISOLATED TORNADO THREAT CONTINUES ACROSS REMAINING
VALID PORTIONS OF WW 472. A SMALL NEWD EXPANSION OF THE TORNADO
WATCH MAY BE NEEDED FOR PART OF NERN IND DEPENDING ON CONVECTIVE
TRENDS.

DISCUSSION...MULTIPLE SUPERCELLS HAVE SPAWNED TORNADOES ACROSS PARTS
OF E-CNTRL IL INTO W-CNTRL IND OVER THE PAST TWO HOURS...WITH
LOW-LEVEL CIRCULATIONS PRESENT IN TIPPECANOE AND FOUNTAIN COUNTIES
IN INDIANA AS OF 0130Z. THE ENVIRONMENT DOWNSTREAM OF ONGOING
ACTIVITY REMAINS FAVORABLE FOR ISOLATED TORNADOES ACROSS PARTS OF
CNTRL/NRN IND...WITH EFFECTIVE SRH AROUND 200-300 M2/S2 PER KIND VWP
AND 01Z RAP MESOANALYSIS ESTIMATES. A SFC LOW IS FORECAST TO DEEPEN
SLIGHTLY ACROSS SRN LOWER MI/FAR NRN IND THROUGH 06Z WITH THE
APPROACH OF UPPER TROUGHING FROM THE W. THIS MAY ALLOW FOR SOME NWD
EXPANSION OF BETTER LOW-LEVEL MOISTURE AND MARGINAL INSTABILITY TO
SUPPORT ONGOING THUNDERSTORM ACTIVITY ACROSS NRN IND. IF SUFFICIENT
INSTABILITY WERE TO DEVELOP FURTHER N...A SMALL EXPANSION OF THE
TORNADO WATCH INTO MORE OF NERN IND MAY BE WARRANTED.

..GLEASON.. 09/10/2016

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...IWX...IND...

LAT...LON   38668749 39388748 40368748 40468707 41508615 41458495
            38968578 38738669 38668749 

NNNN