Alert archive / Illinois / Mesoscale Discussions in 2006

Mesoscale Discussion 705

April 30, 20066 states

The Storm Prediction Center issued this mesoscale discussion at Apr 30, 2006, 5:25 PM CDT for 6 states. It was in force for 95 min.

The area

The outline as issued.

The facts

Issued: Apr 30, 2006, 5:25 PM CDT (22:25 UTC)
Expired: Apr 30, 2006, 7:00 PM CDT
In force: 95 min
Issued by: the Storm Prediction Center

All 119 counties

Clay County, AR, Craighead County, AR, Greene County, AR, Lawrence County, AR, Mississippi County, AR, Poinsett County, AR, Randolph County, AR, Adams County, IL, Alexander County, IL, Bond County, IL, Brown County, IL, Calhoun County, IL, Cass County, IL, Champaign County, IL, Christian County, IL, Clark County, IL, Clay County, IL, Clinton County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, DeWitt County, IL, Douglas County, IL, Edgar County, IL, Edwards County, IL, Effingham County, IL, Fayette County, IL, Franklin County, IL, Gallatin County, IL, Greene County, IL, Hamilton County, IL, Hardin County, IL, Jackson County, IL, Jasper County, IL, Jefferson County, IL, Jersey County, IL, Johnson County, IL, Lawrence County, IL, Logan County, IL, Macon County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Mason County, IL, Massac 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, Pope County, IL, Pulaski County, IL, Randolph County, IL, Richland County, IL, Saint Clair County, IL, Saline County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Shelby County, IL, Union County, IL, Vermilion County, IL, Wabash County, IL, Washington County, IL, Wayne County, IL, White County, IL, Williamson County, IL, Knox County, IN, Posey County, IN, Sullivan County, IN, Vermillion County, IN, Vigo County, IN, Ballard County, KY, Carlisle County, KY, Crittenden County, KY, Fulton County, KY, Graves County, KY, Hickman County, KY, Livingston County, KY, McCracken County, KY, Union County, KY, Bollinger County, MO, Butler County, MO, Cape Girardeau County, MO, Carter County, MO, City of Saint Louis, MO, Dunklin County, MO, Franklin County, MO, Iron County, MO, Jefferson County, MO, Lincoln County, MO, Madison County, MO, Mississippi County, MO, New Madrid County, MO, Pemiscot County, MO, Perry County, MO, Pike County, MO, Ripley County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Scott County, MO, Stoddard County, MO, Warren County, MO, Washington County, MO, Wayne County, MO, Crockett County, TN, Dyer County, TN, Gibson County, TN, Haywood County, TN, Lake County, TN, Lauderdale County, TN, Obion County, TN, Tipton County, TN, Weakley County, TN

The radar

The Paducah radar (KPAH), 111 km from the middle of the area, began a volume at 22:26 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, 10.4 hours before the alert went out and 300 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: 625 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 76 m²/s²
0-3 km storm-relative helicity: 53 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 30, 10:30 AM CDT	Mesoscale Discussion	SPC	Baxter, Fulton, Marion	90 min
Apr 30, 11:20 AM CDT	Mesoscale Discussion	SPC	Crittenden, Mississippi	85 min
Apr 30, 11:52 AM CDT	Severe Thunderstorm Watch	SPC	Baxter, Boone, Clay, Cleburne, Craighead, Fulton and 16 more	7 hr
Apr 30, 1:04 PM CDT	Mesoscale Discussion	SPC	Randolph	86 min
Apr 30, 2:30 PM CDT	Mesoscale Discussion	SPC	Clay, Greene, Mississippi	2 hr
Apr 30, 3:05 PM CDT	Tornado Watch	SPC	Clay, Craighead, Greene, Lawrence, Mississippi, Poinsett and 1 more	6 hr

Nearby

Mesoscale Discussions in Illinois, 2006 Mesoscale Discussions in Missouri, 2006 Mesoscale Discussions in Kentucky, 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.