Alert archive / Illinois / Mesoscale Discussions in 2011

Mesoscale Discussion 1312

June 20, 20114 states

The Storm Prediction Center issued this mesoscale discussion at Jun 20, 2011, 4:08 AM CDT for 4 states. It was in force for 67 min.

The area

The outline as issued.

The facts

Issued
Jun 20, 2011, 4:08 AM CDT (09:08 UTC)
Expired
Jun 20, 2011, 5:15 AM CDT
In force
67 min
Issued by
the Storm Prediction Center
All 71 counties

Benton County, IA, Cedar County, IA, Clinton County, IA, Davis County, IA, Des Moines County, IA, Henry County, IA, Iowa County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Lee County, IA, Linn County, IA, Louisa County, IA, Muscatine County, IA, Scott County, IA, Van Buren County, IA, Washington County, IA, Adams County, IL, Brown County, IL, Bureau 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, Henderson County, IL, Henry County, IL, Iroquois County, IL, Jasper County, IL, Knox County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, Logan County, IL, Macon County, IL, Marshall County, IL, Mason County, IL, McDonough County, IL, McLean County, IL, Menard County, IL, Mercer County, IL, Montgomery County, IL, Morgan County, IL, Moultrie County, IL, Peoria County, IL, Piatt County, IL, Putnam County, IL, Rock Island County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Shelby County, IL, Stark County, IL, Tazewell County, IL, Vermilion County, IL, Warren County, IL, Whiteside County, IL, Woodford County, IL, Vermillion County, IN, Clark County, MO, Lewis County, MO, Scotland County, MO

The radar

The Lincoln radar (KILX), 56 km from the middle of the area, began a volume at 09:07 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 00:00Z, 9.1 hours before the alert went out and 108 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-pSkew-T log-p diagram, Lincoln, IL at 00:00Z on 2011-06-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1795 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 00:00Z on 2011-06-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 167 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
1795 J/kg
Mixed-layer CIN
-133 J/kg
Mixed-layer LCL
1089 m above ground
0-6 km bulk shear
54 kt
0-1 km storm-relative helicity
167 m²/s²
0-3 km storm-relative helicity
197 m²/s²
Significant tornado parameter
0.4
Supercell composite
6.3

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.

IssuedProductOfficeCountiesLasted
Jun 19, 11:42 PM CDTSevere Thunderstorm WatchSPCBureau, Fulton, Hancock, Henderson, Henry, Knox and 13 more6 hr
Jun 20, 1:04 PM CDTMesoscale DiscussionSPCChampaign, Christian, Clark, Coles, Crawford, Cumberland and 14 more56 min
Jun 20, 8:53 AM CDTMesoscale DiscussionSPCBartholomew, Brown, Dearborn, Decatur, Fayette, Franklin and 18 more97 min
Jun 19, 9:16 PM CDTMesoscale DiscussionSPCAdair, Adams, Appanoose, Audubon, Boone, Carroll and 31 more59 min
Jun 19, 9:49 PM CDTTornado WatchSPCFremont, Harrison, Mills, Monona, Montgomery, Page and 2 more6 hr
Jun 20, 1:40 AM CDTMesoscale DiscussionSPCAdair, Adams, Appanoose, Audubon, Boone, Carroll and 24 more35 min
Jun 20, 3:27 AM CDTMesoscale DiscussionSPCAdair, Adams, Appanoose, Audubon, Boone, Carroll and 28 more33 min
Jun 20, 3:46 AM CDTSevere Thunderstorm WatchSPCAdair, Audubon, Black Hawk, Boone, Calhoun, Carroll and 26 more5 hr
Jun 20, 7:29 AM CDTMesoscale DiscussionSPCBlack Hawk, Grundy, Hamilton, Hardin, Jasper, Mahaska and 6 more61 min
Jun 20, 3:08 PM CDTTornado WatchSPCAudubon, Carroll, Cass, Crawford, Fremont, Harrison and 6 more7 hr
Jun 20, 5:55 PM CDTMesoscale DiscussionSPCAdair, Audubon, Boone, Calhoun, Carroll, Dallas and 15 more65 min
Jun 20, 6:17 PM CDTMesoscale DiscussionSPCFremont, Harrison, Mills, Monona, Plymouth, Woodbury58 min
Jun 20, 6:53 PM CDTTornado WatchSPCAdair, Adams, Audubon, Boone, Buena Vista, Calhoun and 41 more6 hr

Nearby

Mesoscale Discussions in Illinois, 2011Mesoscale Discussions in Iowa, 2011Mesoscale Discussions in Missouri, 2011Every mesoscale discussion in 2011

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.