Alert archive / Illinois / Mesoscale Discussions in 2006

Mesoscale Discussion 497

April 14, 200611 counties in Illinois; 5 counties in Iowa; Clark County, Missouri

The Storm Prediction Center issued this mesoscale discussion at Apr 14, 2006, 7:20 AM CDT for 11 counties in Illinois; 5 counties in Iowa; Clark County, Missouri. It was in force for 115 min.

The area

The outline as issued.

The facts

Issued: Apr 14, 2006, 7:20 AM CDT (12:20 UTC)
Expired: Apr 14, 2006, 9:15 AM CDT
In force: 115 min
Issued by: the Storm Prediction Center

Counties Des Moines County, IA, Henry County, IA, Lee County, IA, Louisa County, IA, Van Buren County, IA, Cass County, IL, Fulton County, IL, Hancock County, IL, Henderson County, IL, Knox County, IL, Mason County, IL, McDonough County, IL, Menard County, IL, Peoria County, IL, Schuyler County, IL, Warren County, IL, Clark County, MO

The radar

The Lincoln radar (KILX), 118 km from the middle of the area, began a volume at 12:18 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 183Apr 14, 9:15 AM CDT

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 0.3 hours before the alert went out and 179 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: 1011 J/kg
Mixed-layer CIN: -195 J/kg
Mixed-layer LCL: 1797 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 254 m²/s²
0-3 km storm-relative helicity: 194 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
Apr 13, 7:58 PM CDT	Mesoscale Discussion	SPC	Boone, Bureau, Carroll, DeKalb, DuPage, Ford and 26 more	92 min
Apr 13, 8:24 PM CDT	Severe Thunderstorm Watch	SPC	Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 26 more	7 hr
Apr 13, 10:31 PM CDT	Mesoscale Discussion	SPC	Boone, Bureau, Carroll, Champaign, Cook, DeKalb and 38 more	59 min
Apr 13, 11:30 PM CDT	Severe Thunderstorm Watch	SPC	Champaign, Christian, Clark, Coles, Cumberland, DeWitt and 12 more	2 hr
Apr 14, 1:34 AM CDT	Mesoscale Discussion	SPC	Boone, Bureau, Champaign, Christian, Clark, Clay and 39 more	86 min
Apr 14, 1:58 AM CDT	Tornado Watch	SPC	Champaign, Clark, Clay, Coles, Crawford, Cumberland and 21 more	4 hr
Apr 14, 9:15 AM CDT	Severe Thunderstorm Watch	SPC	Cass, Champaign, Christian, Clark, Coles, Crawford and 29 more	6 hr
Apr 14, 10:05 AM CDT	Mesoscale Discussion	SPC	Brown, Cass, Champaign, Christian, Clark, Coles and 20 more	85 min
Apr 14, 4:48 PM CDT	Mesoscale Discussion	SPC	Brown, Bureau, Cass, Champaign, Christian, Clark and 45 more	87 min
Apr 14, 5:19 PM CDT	Tornado Watch	SPC	Boone, Bureau, Carroll, Cass, Champaign, Christian and 57 more	4 hr
Apr 14, 6:57 PM CDT	Mesoscale Discussion	SPC	Cass, Champaign, Coles, DeWitt, Douglas, Edgar and 24 more	93 min

Nearby

Mesoscale Discussions in Illinois, 2006 Mesoscale Discussions in Iowa, 2006 Mesoscale Discussions in Missouri, 2006 Every mesoscale discussion in 2006

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.