Alert archive / Illinois / Mesoscale Discussions in 2007

Mesoscale Discussion 1752

August 14, 200734 counties in Illinois; 13 counties in Iowa; Clark County, Missouri

The Storm Prediction Center issued this mesoscale discussion at Aug 14, 2007, 5:43 AM CDT for 34 counties in Illinois; 13 counties in Iowa; Clark County, Missouri. It was in force for 62 min.

The area

The outline as issued.

The facts

Issued: Aug 14, 2007, 5:43 AM CDT (10:43 UTC)
Expired: Aug 14, 2007, 6:45 AM CDT
In force: 62 min
Issued by: the Storm Prediction Center

All 48 counties

Cedar County, IA, Des Moines County, IA, Henry County, IA, Iowa County, IA, Jefferson County, IA, Johnson County, IA, Keokuk County, IA, Lee County, IA, Louisa County, IA, Muscatine County, IA, Scott County, IA, Van Buren County, IA, Washington County, IA, Brown County, IL, Bureau County, IL, Cass County, IL, DeWitt County, IL, DuPage County, IL, Ford County, IL, Fulton County, IL, Grundy County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Iroquois County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Knox County, IL, LaSalle County, IL, Livingston County, IL, Logan County, IL, Marshall County, IL, Mason County, IL, McDonough County, IL, McLean County, IL, Menard County, IL, Mercer County, IL, Peoria County, IL, Putnam County, IL, Rock Island County, IL, Schuyler County, IL, Stark County, IL, Tazewell County, IL, Warren County, IL, Will County, IL, Woodford County, IL, Clark County, MO

The radar

The Quad Cities radar (KDVN), 63 km from the middle of the area, began a volume at 10:45 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

Davenport, (KDVN), launched 00:00Z, 10.7 hours before the alert went out and 58 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: 396 J/kg
Mixed-layer CIN: -144 J/kg
Mixed-layer LCL: 1368 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 35 m²/s²
0-3 km storm-relative helicity: 184 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.8

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
Aug 14, 1:23 AM CDT	Mesoscale Discussion	SPC	Boone, Bureau, Carroll, DeKalb, Henry, Jo Daviess and 9 more	67 min
Aug 14, 2:45 AM CDT	Severe Thunderstorm Watch	SPC	Bureau, Carroll, Cass, DeKalb, DeWitt, Fulton and 27 more	4 hr
Aug 14, 5:13 AM CDT	Severe Thunderstorm Watch	SPC	Grundy, Kane, Kankakee, Kendall, Will	86 min
Aug 13, 9:45 PM CDT	Severe Thunderstorm Watch	SPC	Allamakee, Black Hawk, Bremer, Buchanan, Butler, Cerro Gordo and 11 more	6 hr
Aug 13, 11:35 PM CDT	Mesoscale Discussion	SPC	Allamakee	85 min
Aug 14, 3:32 AM CDT	Mesoscale Discussion	SPC	Allamakee, Black Hawk, Bremer, Buchanan, Butler, Chickasaw and 7 more	28 min
Aug 14, 3:05 PM CDT	Mesoscale Discussion	SPC	Adair, Audubon, Benton, Black Hawk, Boone, Calhoun and 28 more	85 min
Aug 14, 6:54 PM CDT	Mesoscale Discussion	SPC	Adair, Appanoose, Audubon, Boone, Calhoun, Carroll and 35 more	66 min

Nearby

Mesoscale Discussions in Illinois, 2007 Mesoscale Discussions in Iowa, 2007 Mesoscale Discussions in Missouri, 2007 Every mesoscale discussion in 2007

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.