Alert archive / Illinois / Mesoscale Discussions in 2010

Mesoscale Discussion 1017

June 18, 20104 states

The Storm Prediction Center issued this mesoscale discussion at Jun 18, 2010, 10:46 PM CDT for 4 states. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued: Jun 18, 2010, 10:46 PM CDT (03:46 UTC)
Expired: Jun 19, 2010, 12:15 AM CDT
In force: 89 min
Issued by: the Storm Prediction Center

All 66 counties

Adams County, IL, Brown County, IL, Cass County, IL, Champaign County, IL, Christian County, IL, Clark County, IL, Coles County, IL, Cumberland County, IL, DeWitt County, IL, Douglas County, IL, Edgar County, IL, Effingham County, IL, Ford County, IL, Fulton County, IL, Hancock County, IL, Jasper County, IL, Logan County, IL, Macon County, IL, Mason County, IL, McDonough County, IL, McLean County, IL, Menard County, IL, Morgan County, IL, Moultrie County, IL, Piatt County, IL, Pike County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Shelby County, IL, Tazewell County, IL, Vermilion County, IL, Clay County, IN, Morgan County, IN, Owen County, IN, Parke County, IN, Putnam County, IN, Vermillion County, IN, Vigo County, IN, Atchison County, KS, Adair County, MO, Andrew County, MO, Buchanan County, MO, Caldwell County, MO, Carroll County, MO, Chariton County, MO, Clark County, MO, Clay County, MO, Clinton County, MO, Daviess County, MO, DeKalb County, MO, Grundy County, MO, Knox County, MO, Lewis County, MO, Linn County, MO, Livingston County, MO, Macon County, MO, Marion County, MO, Monroe County, MO, Pike County, MO, Platte County, MO, Ralls County, MO, Randolph County, MO, Ray County, MO, Shelby County, MO, Sullivan County, MO

The radar

The St Louis radar (KLSX), 145 km from the middle of the area, began a volume at 03:45 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 347Jun 18, 11:40 PM CDT

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 3.8 hours before the alert went out and 215 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: 1389 J/kg
Mixed-layer CIN: -99 J/kg
Mixed-layer LCL: 1139 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 231 m²/s²
0-3 km storm-relative helicity: 325 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.4

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
Jun 18, 7:38 PM CDT	Mesoscale Discussion	SPC	Adams, Boone, Brown, Bureau, Carroll, Cass and 34 more	97 min
Jun 18, 8:05 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Brown, Bureau, Cass, Christian, Cook and 36 more	4 hr
Jun 18, 11:38 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Bond, Brown, Calhoun, Cass, Champaign and 29 more	5 hr
Jun 19, 2:33 AM CDT	Mesoscale Discussion	SPC	Clay, Clinton, Edwards, Franklin, Gallatin, Hamilton and 19 more	57 min
Jun 19, 1:07 PM CDT	Mesoscale Discussion	SPC	Calhoun, Jersey	53 min
Jun 19, 1:48 PM CDT	Severe Thunderstorm Watch	SPC	Bond, Calhoun, Clinton, Fayette, Greene, Jersey and 9 more	5 hr
Jun 19, 5:55 PM CDT	Mesoscale Discussion	SPC	Alexander, Bond, Christian, Clay, Clinton, Cumberland and 28 more	95 min
Jun 18, 10:21 PM CDT	Mesoscale Discussion	SPC	DeKalb, Elkhart, Fulton, Kosciusko, LaGrange, LaPorte and 8 more	54 min
Jun 19, 4:47 AM CDT	Mesoscale Discussion	SPC	Cloud, Jewell, Norton, Phillips, Republic, Smith	88 min
Jun 19, 5:30 AM CDT	Severe Thunderstorm Watch	SPC	Cloud, Decatur, Jewell, Mitchell, Norton, Osborne and 3 more	7 hr
Jun 19, 6:50 AM CDT	Mesoscale Discussion	SPC	Atchison, Brown, Doniphan, Jackson, Jefferson, Jewell and 6 more	55 min
Jun 19, 8:02 AM CDT	Severe Thunderstorm Watch	SPC	Anderson, Atchison, Brown, Chase, Clay, Coffey and 26 more	7 hr
Jun 19, 11:29 AM CDT	Mesoscale Discussion	SPC	Johnson, Leavenworth, Miami, Wyandotte	91 min
Jun 19, 3:45 PM CDT	Mesoscale Discussion	SPC	Jewell, Norton, Phillips, Republic, Smith	2 hr
Jun 19, 5:05 PM CDT	Tornado Watch	SPC	Clay, Cloud, Decatur, Ellis, Geary, Gove and 17 more	6 hr
Jun 19, 6:55 PM CDT	Mesoscale Discussion	SPC	Brown, Cloud, Jewell, Marshall, Mitchell, Nemaha and 5 more	95 min

Nearby

Mesoscale Discussions in Illinois, 2010 Mesoscale Discussions in Missouri, 2010 Mesoscale Discussions in Indiana, 2010 Every mesoscale discussion in 2010

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.