Alert archive / Illinois / Mesoscale Discussions in 2009

Mesoscale Discussion 930

June 2, 200938 counties in Illinois; 11 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Jun 2, 2009, 6:22 PM CDT for 38 counties in Illinois; 11 counties in Missouri. It was in force for 83 min.

The area

The outline as issued.

The facts

Issued: Jun 2, 2009, 6:22 PM CDT (23:22 UTC)
Expired: Jun 2, 2009, 7:45 PM CDT
In force: 83 min
Issued by: the Storm Prediction Center

All 49 counties

Adams County, IL, Bond County, IL, Brown County, IL, Calhoun County, IL, Cass County, IL, Christian County, IL, Clay County, IL, Clinton County, IL, Coles County, IL, Cumberland County, IL, DeWitt County, IL, Effingham County, IL, Fayette County, IL, Franklin County, IL, Greene County, IL, Jasper County, IL, Jefferson County, IL, Jersey County, IL, Logan County, IL, Macon County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Menard County, IL, Monroe County, IL, Montgomery County, IL, Morgan County, IL, Moultrie County, IL, Perry County, IL, Piatt County, IL, Pike County, IL, Randolph County, IL, Saint Clair County, IL, Sangamon County, IL, Scott County, IL, Shelby County, IL, Washington County, IL, Wayne County, IL, City of Saint Louis, MO, Jefferson County, MO, Lincoln County, MO, Marion County, MO, Pike County, MO, Ralls County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Warren County, MO

The radar

The St Louis radar (KLSX), 85 km from the middle of the area, began a volume at 23:24 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, 11.4 hours before the alert went out and 156 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: 1021 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 125 m²/s²
0-3 km storm-relative helicity: 164 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 1, 8:57 PM CDT	Mesoscale Discussion	SPC	Champaign, DeWitt, Ford, Fulton, Iroquois, McDonough and 6 more	63 min
Jun 2, 11:58 AM CDT	Mesoscale Discussion	SPC	Bond, Calhoun, Christian, Clark, Clay, Clinton and 40 more	92 min
Jun 2, 12:27 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Bond, Brown, Calhoun, Cass, Champaign and 54 more	8 hr
Jun 2, 3:47 PM CDT	Mesoscale Discussion	SPC	Adams, Bond, Brown, Calhoun, Cass, Christian and 34 more	88 min
Jun 1, 9:27 PM CDT	Mesoscale Discussion	SPC	Atchison, Gentry, Harrison, Holt, Mercer, Nodaway and 2 more	63 min
Jun 2, 2:14 PM CDT	Mesoscale Discussion	SPC	Bates, Benton, Carroll, Cass, Chariton, Clay and 15 more	2 hr

Nearby

Mesoscale Discussions in Illinois, 2009 Mesoscale Discussions in Missouri, 2009 Every mesoscale discussion in 2009

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.