Alert archive / Indiana / Mesoscale Discussions in 2016

Mesoscale Discussion 997

June 20, 20169 counties in Illinois; 50 counties in Indiana; 11 counties in Ohio

The Storm Prediction Center issued this mesoscale discussion at Jun 20, 2016, 6:05 PM CDT for 9 counties in Illinois; 50 counties in Indiana; 11 counties in Ohio. It was in force for 85 min.

The area

The outline as issued.

The facts

Issued: Jun 20, 2016, 6:05 PM CDT (23:05 UTC)
Expired: Jun 20, 2016, 7:30 PM CDT
In force: 85 min
Issued by: the Storm Prediction Center

All 70 counties

Champaign County, IL, DeWitt County, IL, Edgar County, IL, Ford County, IL, Iroquois County, IL, Livingston County, IL, McLean County, IL, Piatt County, IL, Vermilion County, IL, Adams County, IN, Allen County, IN, Benton County, IN, Blackford County, IN, Boone County, IN, Carroll County, IN, Cass County, IN, Clinton County, IN, DeKalb County, IN, Delaware County, IN, Fayette County, IN, Fountain County, IN, Franklin County, IN, Fulton County, IN, Grant County, IN, Hamilton County, IN, Hancock County, IN, Hendricks County, IN, Henry County, IN, Howard County, IN, Huntington County, IN, Jasper County, IN, Jay County, IN, Johnson County, IN, Kosciusko County, IN, Madison County, IN, Marion County, IN, Marshall County, IN, Miami County, IN, Montgomery County, IN, Morgan County, IN, Newton County, IN, Noble County, IN, Parke County, IN, Pulaski County, IN, Putnam County, IN, Randolph County, IN, Rush County, IN, Shelby County, IN, Starke County, IN, Tippecanoe County, IN, Tipton County, IN, Union County, IN, Vermillion County, IN, Wabash County, IN, Warren County, IN, Wayne County, IN, Wells County, IN, White County, IN, Whitley County, IN, Allen County, OH, Auglaize County, OH, Darke County, OH, Mercer County, OH, Miami County, OH, Montgomery County, OH, Paulding County, OH, Preble County, OH, Putnam County, OH, Shelby County, OH, Van Wert County, OH

The radar

The Indianapolis radar (KIND), 100 km from the middle of the area, began a volume at 23:08 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 11.1 hours before the alert went out and 162 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 225 J/kg
Mixed-layer CIN: -178 J/kg
Mixed-layer LCL: 1180 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 51 m²/s²
0-3 km storm-relative helicity: 146 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

351 
ACUS11 KWNS 202306
SWOMCD
SPC MCD 202305 
OHZ000-INZ000-ILZ000-210030-

MESOSCALE DISCUSSION 0997
NWS STORM PREDICTION CENTER NORMAN OK
0605 PM CDT MON JUN 20 2016

AREAS AFFECTED...EASTERN ILLINOIS...MUCH OF INDIANA...AND WESTERN
OHIO

CONCERNING...SEVERE THUNDERSTORM WATCH 275...

VALID 202305Z - 210030Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 275
CONTINUES.

SUMMARY...THE THREAT FOR A FEW STRONG WIND GUSTS MAY CONTINUE ACROSS
WATCH 275 THIS EVENING...BUT SHOULD GRADUALLY DIMINISH WITH TIME AS
MOST CELLS PROGRESS SOUTH AND WEAKEN.

DISCUSSION...THE LATEST REGIONAL RADAR MOSAIC DEPICTS A CLUSTER OF
STRONG THUNDERSTORMS PROGRESSING SOUTH/SOUTHEAST ACROSS WATCH 275
THIS EVENING. MOST OF THIS CONVECTION HAS TAKEN A MULTICELLULAR
MODE...WITH NEW DEVELOPMENT BEING DRIVEN BY COLD-POOL PROPAGATION.
CELL MERGERS AND ENHANCED AREAS OF FORWARD PROPAGATION MAY FURTHER
YIELD A STRONG-WIND THREAT THIS EVENING...AS CELLS PERSIST IN AN
ENVIRONMENT CHARACTERIZED BY A MOIST/WELL-HEATED BOUNDARY LAYER.
HOWEVER...THE OVERALL SEVERE POTENTIAL OF THESE CELLS SHOULD
GRADUALLY LESSEN AS THEY MOVE FARTHER SOUTH...AWAY FROM MORE
VIGOROUS MID-LEVEL FLOW ALONG THE PERIPHERY OF AN IMPULSE OVER
ONTARIO.

WHILE A COUPLE CELLS COULD INITIATE FARTHER NORTH ALONG THE COLD
FRONT IN NORTHERN INDIANA LATE THIS EVENING...ONLY MODEST SFC
CONVERGENCE AND GRADUAL COOLING OF THE BOUNDARY LAYER SHOULD TEMPER
MORE WIDESPREAD INITIATION.

..PICCA.. 06/20/2016

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

ATTN...WFO...CLE...ILN...IWX...IND...LOT...ILX...

LAT...LON   41068824 41408611 41458476 40888377 39838394 39368500
            39408731 40098893 40468921 40888879 41068824

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 20, 1:54 PM CDT	Mesoscale Discussion	SPC	Champaign, DeWitt, Douglas, Ford, Iroquois, Kankakee and 8 more	2 hr
Jun 20, 3:03 PM CDT	Severe Thunderstorm Watch	SPC	Champaign, DeWitt, Douglas, Edgar, Ford, Iroquois and 5 more	7 hr
Jun 20, 3:07 PM CDT	Mesoscale Discussion	SPC	Adams, Brown, Fulton, Hancock, Henderson, Knox and 4 more	83 min

Nearby

Mesoscale Discussions in Indiana, 2016 Mesoscale Discussions in Ohio, 2016 Mesoscale Discussions in Illinois, 2016 Every mesoscale discussion in 2016

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.