Alert archive / Indiana / Mesoscale Discussions in 2016

Mesoscale Discussion 219

March 15, 20164 states

The Storm Prediction Center issued this mesoscale discussion at Mar 15, 2016, 8:07 PM CDT for 4 states. It was in force for 53 min.

The area

The outline as issued.

The facts

Issued: Mar 15, 2016, 8:07 PM CDT (01:07 UTC)
Expired: Mar 15, 2016, 9:00 PM CDT
In force: 53 min
Issued by: the Storm Prediction Center
Chance of a watch: 80%

Counties Cook County, IL, DuPage County, IL, Iroquois County, IL, Kankakee County, IL, Lake County, IL, Vermilion County, IL, Will County, IL, Benton County, IN, Jasper County, IN, Lake County, IN, LaPorte County, IN, Newton County, IN, Porter County, IN, Pulaski County, IN, Starke County, IN, Tippecanoe County, IN, Warren County, IN, White County, IN, Berrien County, MI, Kenosha County, WI

The radar

The Chicago radar (KLOT), 78 km from the middle of the area, began a volume at 01:08 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 45Mar 15, 8:35 PM CDT

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 1.1 hours before the alert went out and 139 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: 1364 J/kg
Mixed-layer CIN: -54 J/kg
Mixed-layer LCL: 1257 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 135 m²/s²
0-3 km storm-relative helicity: 241 m²/s²
Significant tornado parameter: 1.2
Supercell composite: 8.9

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Mar 15, 8:40 PM CDT	Severe Thunderstorm Watch	SPC	Boone, Cook, DeKalb, DuPage, Ford, Grundy and 7 more	4 hr
Mar 15, 10:58 PM CDT	Mesoscale Discussion	SPC	Cass, Fulton, Jasper, Lake, LaPorte, Marshall and 6 more	92 min
Mar 16, 5:42 AM CDT	Mesoscale Discussion	SPC	Gogebic	6 hr

Nearby

Mesoscale Discussions in Indiana, 2016 Mesoscale Discussions in Illinois, 2016 Mesoscale Discussions in Michigan, 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.