Alert archive / Illinois / Mesoscale Discussions in 2008

Mesoscale Discussion 1107

May 31, 200814 counties in Illinois; Benton County, Warren County, Indiana

The Storm Prediction Center issued this mesoscale discussion at May 31, 2008, 1:38 AM CDT for 14 counties in Illinois; Benton County, Warren County, Indiana. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: May 31, 2008, 1:38 AM CDT (06:38 UTC)
Expired: May 31, 2008, 3:45 AM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Champaign County, IL, DeWitt County, IL, Ford County, IL, Iroquois County, IL, Livingston County, IL, Logan County, IL, Marshall County, IL, Mason County, IL, McLean County, IL, Peoria County, IL, Piatt County, IL, Tazewell County, IL, Vermilion County, IL, Woodford County, IL, Benton County, IN, Warren County, IN

The radar

The Lincoln radar (KILX), 60 km from the middle of the area, began a volume at 06:44 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, 6.6 hours before the alert went out and 34 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: 1830 J/kg
Mixed-layer CIN: -43 J/kg
Mixed-layer LCL: 984 m above ground
0-6 km bulk shear: 0 kt
0-1 km storm-relative helicity: 0 m²/s²
0-3 km storm-relative helicity: 0 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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, 9:16 PM CDT	Mesoscale Discussion	SPC	Bond, Calhoun, Christian, Clark, Clay, Clinton and 31 more	29 min
May 30, 9:58 PM CDT	Severe Thunderstorm Watch	SPC	Bond, Clark, Clay, Clinton, Coles, Crawford and 19 more	5 hr
May 30, 11:35 PM CDT	Mesoscale Discussion	SPC	Bond, Clark, Clay, Clinton, Coles, Crawford and 23 more	55 min

Nearby

Mesoscale Discussions in Illinois, 2008 Mesoscale Discussions in Indiana, 2008 Every mesoscale discussion in 2008

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.