Alert archive / Illinois / Mesoscale Discussions in 2013

Mesoscale Discussion 895

May 30, 201317 counties in Illinois; 5 counties in Indiana

The Storm Prediction Center issued this mesoscale discussion at May 30, 2013, 10:03 PM CDT for 17 counties in Illinois; 5 counties in Indiana. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued: May 30, 2013, 10:03 PM CDT (03:03 UTC)
Expired: May 30, 2013, 11:30 PM CDT
In force: 87 min
Issued by: the Storm Prediction Center

All 22 counties

Champaign County, IL, Clark County, IL, Clay County, IL, Coles County, IL, Cook County, IL, Crawford County, IL, Cumberland County, IL, Douglas County, IL, Edgar County, IL, Effingham County, IL, Ford County, IL, Iroquois County, IL, Jasper County, IL, Kankakee County, IL, Lawrence County, IL, Richland County, IL, Vermilion County, IL, Benton County, IN, Jasper County, IN, Lake County, IN, Newton County, IN, Porter County, IN

The radar

The Lincoln radar (KILX), 129 km from the middle of the area, began a volume at 03:05 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 00:00Z, 3.1 hours before the alert went out and 67 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: 596 J/kg
Mixed-layer CIN: -54 J/kg
Mixed-layer LCL: 1317 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 122 m²/s²
0-3 km storm-relative helicity: 151 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 2.6

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 30, 7:04 PM CDT	Mesoscale Discussion	SPC	Bond, Boone, Calhoun, Champaign, Christian, Clark and 56 more	56 min
May 30, 7:38 PM CDT	Severe Thunderstorm Watch	SPC	Champaign, Christian, Clark, Clay, Coles, Crawford and 12 more	5 hr
May 31, 8:45 AM CDT	Mesoscale Discussion	SPC	Bond, Calhoun, Clinton, Greene, Jersey, Macoupin and 5 more	90 min
May 31, 5:21 PM CDT	Mesoscale Discussion	SPC	Calhoun, Christian, Greene, Jersey, Logan, Macoupin and 4 more	54 min
May 31, 5:45 PM CDT	Tornado Watch	SPC	Bond, Calhoun, Clinton, Fayette, Greene, Jersey and 8 more	4 hr
May 31, 12:26 PM CDT	Mesoscale Discussion	SPC	Adams, Bartholomew, Blackford, Brown, Clark, Crawford and 25 more	94 min
May 31, 6:00 PM CDT	Mesoscale Discussion	SPC	Fulton, Huntington, Kosciusko, Marshall, Noble, Starke and 2 more	60 min
May 31, 6:19 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Allen, Blackford, Cass, DeKalb, Elkhart and 18 more	4 hr

Nearby

Mesoscale Discussions in Illinois, 2013 Mesoscale Discussions in Indiana, 2013 Every mesoscale discussion in 2013

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.