Alert archive / Illinois / Mesoscale Discussions in 2014

Mesoscale Discussion 811

June 4, 20148 counties in Illinois; Vermillion County, Indiana

The Storm Prediction Center issued this mesoscale discussion at Jun 4, 2014, 3:46 AM CDT for 8 counties in Illinois; Vermillion County, Indiana. It was in force for 59 min.

The area

The outline as issued.

The facts

Issued: Jun 4, 2014, 3:46 AM CDT (08:46 UTC)
Expired: Jun 4, 2014, 4:45 AM CDT
In force: 59 min
Issued by: the Storm Prediction Center

Counties Champaign County, IL, Coles County, IL, Douglas County, IL, Edgar County, IL, Moultrie County, IL, Piatt County, IL, Shelby County, IL, Vermilion County, IL, Vermillion County, IN

The radar

The Lincoln radar (KILX), 103 km from the middle of the area, began a volume at 08:46 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, 8.8 hours before the alert went out and 46 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2429 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 10 m²/s²
0-3 km storm-relative helicity: 147 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
Jun 3, 8:05 PM CDT	Mesoscale Discussion	SPC	Adams, Brown, Calhoun, Greene, Jersey, Morgan and 2 more	85 min
Jun 3, 9:25 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Brown, Pike	5 hr
Jun 3, 11:04 PM CDT	Severe Thunderstorm Watch	SPC	Cass, Fulton, Logan, Mason, Menard, Morgan and 4 more	4 hr
Jun 4, 1:29 AM CDT	Mesoscale Discussion	SPC	Adams, Brown, Calhoun, Cass, Champaign, Christian and 23 more	91 min
Jun 4, 1:52 AM CDT	Severe Thunderstorm Watch	SPC	Champaign, Christian, Coles, DeWitt, Douglas, Edgar and 6 more	3 hr
Jun 4, 5:00 AM CDT	Severe Thunderstorm Watch	SPC	Bond, Calhoun, Clinton, Fayette, Greene, Jersey and 8 more	4 hr
Jun 4, 7:01 AM CDT	Mesoscale Discussion	SPC	Bond, Clinton, Fayette, Madison, Monroe, Saint Clair	89 min
Jun 4, 12:20 PM CDT	Mesoscale Discussion	SPC	Alexander, Clay, Clinton, Edwards, Franklin, Gallatin and 22 more	115 min
Jun 4, 2:21 PM CDT	Tornado Watch	SPC	Alexander, Clay, Clinton, Edwards, Franklin, Gallatin and 22 more	6 hr
Jun 4, 6:57 PM CDT	Mesoscale Discussion	SPC	Alexander, Massac, Pope, Pulaski	2 hr
Jun 4, 1:51 PM CDT	Tornado Watch	SPC	Dearborn, Ohio, Ripley, Switzerland	10 hr

Nearby

Mesoscale Discussions in Illinois, 2014 Mesoscale Discussions in Indiana, 2014 Every mesoscale discussion in 2014

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.