Alert archive / Illinois / Mesoscale Discussions in 2009

Mesoscale Discussion 208

March 8, 200933 counties in Illinois; 6 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Mar 8, 2009, 11:35 AM CDT for 33 counties in Illinois; 6 counties in Missouri. It was in force for 115 min.

The area

The outline as issued.

The facts

Issued: Mar 8, 2009, 11:35 AM CDT (16:35 UTC)
Expired: Mar 8, 2009, 1:30 PM CDT
In force: 115 min
Issued by: the Storm Prediction Center

All 39 counties

Bond County, IL, Champaign County, IL, Christian County, IL, Clay County, IL, Clinton County, IL, Coles County, IL, Cumberland County, IL, DeWitt County, IL, Douglas County, IL, Effingham County, IL, Fayette County, IL, Franklin County, IL, Hamilton County, IL, Jackson County, IL, Jasper County, IL, Jefferson 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, Moultrie County, IL, Perry County, IL, Piatt County, IL, Randolph County, IL, Saint Clair County, IL, Sangamon County, IL, Shelby County, IL, Washington County, IL, Wayne County, IL, Bollinger County, MO, Cape Girardeau County, MO, City of Saint Louis, MO, Madison County, MO, Perry County, MO, Sainte Genevieve County, MO

The radar

The St Louis radar (KLSX), 126 km from the middle of the area, began a volume at 16:34 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, 4.6 hours before the alert went out and 142 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: 441 m above ground
0-6 km bulk shear: 78 kt
0-1 km storm-relative helicity: 389 m²/s²
0-3 km storm-relative helicity: 401 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

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
Mar 7, 10:26 PM CST	Mesoscale Discussion	SPC	Adams, Brown, Cass, Fulton, Hancock, Logan and 7 more	2 hr
Mar 8, 6:32 AM CDT	Tornado Watch	SPC	Adams, Bond, Brown, Calhoun, Cass, Clinton and 15 more	7 hr
Mar 8, 9:26 AM CDT	Mesoscale Discussion	SPC	Bond, Brown, Calhoun, Cass, Christian, Clinton and 32 more	64 min
Mar 8, 10:39 AM CDT	Tornado Watch	SPC	Alexander, Champaign, Christian, Clark, Clay, Coles and 45 more	7 hr
Mar 7, 6:31 PM CST	Mesoscale Discussion	SPC	Bates, Buchanan, Caldwell, Carroll, Cass, Chariton and 12 more	59 min
Mar 7, 7:33 PM CST	Severe Thunderstorm Watch	SPC	Bates, Buchanan, Caldwell, Carroll, Cass, Chariton and 16 more	7 hr
Mar 8, 12:43 AM CST	Mesoscale Discussion	SPC	Buchanan, Caldwell, Carroll, Cass, Chariton, Clay and 13 more	92 min
Mar 8, 5:56 AM CDT	Mesoscale Discussion	SPC	Audrain, Barton, Bates, Benton, Boone, Callaway and 25 more	64 min

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.