Alert archive / Illinois / Mesoscale Discussions in 2014

Mesoscale Discussion 793

June 3, 201425 counties in Illinois; 9 counties in Indiana; 20 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Jun 3, 2014, 12:41 PM CDT for 25 counties in Illinois; 9 counties in Indiana; 20 counties in Missouri. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Jun 3, 2014, 12:41 PM CDT (17:41 UTC)
Expired: Jun 3, 2014, 3:15 PM CDT
In force: 3 hr
Issued by: the Storm Prediction Center
Chance of a watch: 40%

All 54 counties

Bond County, IL, Calhoun County, IL, Clay County, IL, Clinton County, IL, Crawford County, IL, Edwards County, IL, Effingham County, IL, Fayette County, IL, Franklin County, IL, Hamilton County, IL, Jasper County, IL, Jefferson County, IL, Jersey County, IL, Lawrence County, IL, Madison County, IL, Marion County, IL, Monroe County, IL, Perry County, IL, Randolph County, IL, Richland County, IL, Saint Clair County, IL, Wabash County, IL, Washington County, IL, Wayne County, IL, White County, IL, Daviess County, IN, Dubois County, IN, Gibson County, IN, Greene County, IN, Knox County, IN, Lawrence County, IN, Martin County, IN, Pike County, IN, Sullivan County, IN, Audrain County, MO, Boone County, MO, Callaway County, MO, City of Saint Louis, MO, Cole County, MO, Cooper County, MO, Franklin County, MO, Gasconade County, MO, Howard County, MO, Jefferson County, MO, Lincoln County, MO, Maries County, MO, Moniteau County, MO, Montgomery County, MO, Osage County, MO, Randolph County, MO, Saint Charles County, MO, Saint Louis County, MO, Saline County, MO, Warren County, MO

The radar

The St Louis radar (KLSX), 35 km from the middle of the area, began a volume at 17:41 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 12:00Z, 5.7 hours before the alert went out and 207 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: 263 J/kg
Mixed-layer CIN: -117 J/kg
Mixed-layer LCL: 1337 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: -1 m²/s²
0-3 km storm-relative helicity: 53 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.1

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, 11:10 AM CDT	Mesoscale Discussion	SPC	Dearborn, Decatur, Franklin, Jefferson, Ohio, Ripley and 2 more	3 hr
Jun 3, 1:12 PM CDT	Tornado Watch	SPC	Andrew, Atchison, Daviess, DeKalb, Gentry, Harrison and 3 more	10 hr
Jun 3, 4:37 PM CDT	Mesoscale Discussion	SPC	Adair, Andrew, Atchison, Clark, Daviess, DeKalb and 17 more	83 min
Jun 3, 5:59 PM CDT	Tornado Watch	SPC	Adair, Andrew, Atchison, Buchanan, Caldwell, Clay and 19 more	7 hr

Nearby

Mesoscale Discussions in Illinois, 2014 Mesoscale Discussions in Missouri, 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.