Alert archive / Illinois / Mesoscale Discussions in 2008

Mesoscale Discussion 1722

July 8, 200816 counties in Illinois; 5 counties in Iowa; Clark County, Schuyler County, Scotland County, Missouri

The Storm Prediction Center issued this mesoscale discussion at Jul 8, 2008, 1:15 AM CDT for 16 counties in Illinois; 5 counties in Iowa; Clark County, Schuyler County, Scotland County, Missouri. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Jul 8, 2008, 1:15 AM CDT (06:15 UTC)
Expired: Jul 8, 2008, 3:45 AM CDT
In force: 3 hr
Issued by: the Storm Prediction Center

All 24 counties

Davis County, IA, Des Moines County, IA, Henry County, IA, Lee County, IA, Van Buren County, IA, Ford County, IL, Fulton County, IL, Hancock County, IL, Henderson County, IL, Knox County, IL, Livingston County, IL, Marshall County, IL, Mason County, IL, McDonough County, IL, McLean County, IL, Peoria County, IL, Putnam County, IL, Stark County, IL, Tazewell County, IL, Warren County, IL, Woodford County, IL, Clark County, MO, Schuyler County, MO, Scotland County, MO

The radar

The Quad Cities radar (KDVN), 110 km from the middle of the area, began a volume at 06:16 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, 6.3 hours before the alert went out and 111 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: 3226 J/kg
Mixed-layer CIN: -23 J/kg
Mixed-layer LCL: 1042 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 171 m²/s²
0-3 km storm-relative helicity: 274 m²/s²
Significant tornado parameter: 2.7
Supercell composite: 16.8

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
Jul 7, 7:30 PM CDT	Mesoscale Discussion	SPC	Carroll, Jo Daviess	30 min
Jul 7, 7:40 PM CDT	Severe Thunderstorm Watch	SPC	Carroll, Jo Daviess, Rock Island, Stephenson, Whiteside	4 hr
Jul 7, 8:32 PM CDT	Mesoscale Discussion	SPC	Boone, Carroll, DeKalb, Jo Daviess, Kane, Lee and 5 more	88 min
Jul 7, 10:21 PM CDT	Mesoscale Discussion	SPC	Boone, Bureau, DeKalb, DuPage, Kane, Kendall and 4 more	84 min
Jul 8, 1:27 PM CDT	Mesoscale Discussion	SPC	Adams, Bond, Brown, Calhoun, Cass, Champaign and 35 more	93 min
Jul 8, 1:54 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Bond, Brown, Calhoun, Cass, Champaign and 34 more	7 hr
Jul 8, 4:22 PM CDT	Mesoscale Discussion	SPC	Bond, Calhoun, Champaign, Christian, Clark, Clay and 25 more	53 min
Jul 8, 6:02 PM CDT	Mesoscale Discussion	SPC	Bond, Calhoun, Champaign, Christian, Clark, Clay and 25 more	58 min

Nearby

Mesoscale Discussions in Illinois, 2008 Mesoscale Discussions in Iowa, 2008 Mesoscale Discussions in Missouri, 2008 Every mesoscale discussion in 2008

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.