Alert archive / Missouri / Mesoscale Discussions in 2015

Mesoscale Discussion 1106

June 21, 201516 counties in Illinois; 20 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Jun 21, 2015, 3:56 PM CDT for 16 counties in Illinois; 20 counties in Missouri. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jun 21, 2015, 3:56 PM CDT (20:56 UTC)
Expired: Jun 21, 2015, 6:00 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 40%

All 36 counties

Clinton County, IL, Franklin County, IL, Hamilton County, IL, Hardin County, IL, Jackson County, IL, Jefferson County, IL, Johnson County, IL, Monroe County, IL, Perry County, IL, Pope County, IL, Randolph County, IL, Saint Clair County, IL, Saline County, IL, Union County, IL, Washington County, IL, Williamson County, IL, Benton County, MO, Camden County, MO, Cape Girardeau County, MO, Cole County, MO, Crawford County, MO, Franklin County, MO, Gasconade County, MO, Hickory County, MO, Iron County, MO, Jefferson County, MO, Maries County, MO, Miller County, MO, Morgan County, MO, Osage County, MO, Perry County, MO, Phelps County, MO, Pulaski County, MO, Saint Francois County, MO, Sainte Genevieve County, MO, Washington County, MO

The radar

The St Louis radar (KLSX), 58 km from the middle of the area, began a volume at 21:00 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 325Jun 21, 5:05 PM CDT

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 8.9 hours before the alert went out and 287 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: 1489 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 94 m²/s²
0-3 km storm-relative helicity: 143 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 20, 10:12 PM CDT	Mesoscale Discussion	SPC	Adams, Brown, Cass, Fulton, Hancock, Henderson and 11 more	63 min
Jun 20, 10:13 PM CDT	Severe Thunderstorm Watch	SPC	Champaign, Clark, Coles, Cumberland, Douglas, Edgar and 7 more	4 hr
Jun 20, 11:32 PM CDT	Mesoscale Discussion	SPC	Champaign, Clark, Coles, Cumberland, Douglas, Edgar and 6 more	58 min
Jun 21, 2:58 AM CDT	Mesoscale Discussion	SPC	Calhoun, Greene, Jersey	2 hr
Jun 21, 9:42 AM CDT	Mesoscale Discussion	SPC	Calhoun, Jersey	2 hr
Jun 21, 12:12 PM CDT	Severe Thunderstorm Watch	SPC	Calhoun, Pike	5 hr
Jun 21, 5:05 PM CDT	Severe Thunderstorm Watch	SPC	Franklin, Gallatin, Hamilton, Hardin, Jackson, Jefferson and 7 more	5 hr
Jun 21, 3:03 PM CDT	Mesoscale Discussion	SPC	Andrew, Buchanan, Caldwell, Carroll, Clay, Clinton and 9 more	87 min
Jun 21, 6:44 PM CDT	Mesoscale Discussion	SPC	Andrew, Atchison, Daviess, Gentry, Grundy, Harrison and 6 more	91 min

Nearby

Mesoscale Discussions in Missouri, 2015 Mesoscale Discussions in Illinois, 2015 Every mesoscale discussion in 2015

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.