Alert archive / Illinois / Mesoscale Discussions in 2011

Mesoscale Discussion 1227

June 15, 201128 counties in Illinois; 9 counties in Iowa; 11 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Jun 15, 2011, 1:55 AM CDT for 28 counties in Illinois; 9 counties in Iowa; 11 counties in Missouri. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued
Jun 15, 2011, 1:55 AM CDT (06:55 UTC)
Expired
Jun 15, 2011, 5:00 AM CDT
In force
3 hr
Issued by
the Storm Prediction Center
All 48 counties

Appanoose County, IA, Davis County, IA, Des Moines County, IA, Henry County, IA, Jefferson County, IA, Lee County, IA, Monroe County, IA, Van Buren County, IA, Wapello County, IA, Adams County, IL, Brown County, IL, Calhoun County, IL, Cass County, IL, Christian County, IL, DeWitt County, IL, Fulton County, IL, Greene County, IL, Hancock County, IL, Henderson County, IL, Jersey County, IL, Knox County, IL, Logan County, IL, Macon County, IL, Macoupin County, IL, Mason County, IL, McDonough County, IL, McLean County, IL, Menard County, IL, Montgomery County, IL, Morgan County, IL, Peoria County, IL, Pike County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Tazewell County, IL, Warren County, IL, Adair County, MO, Clark County, MO, Knox County, MO, Lewis County, MO, Marion County, MO, Monroe County, MO, Pike County, MO, Ralls County, MO, Schuyler County, MO, Scotland County, MO, Shelby County, MO

The radar

The Quad Cities radar (KDVN), 167 km from the middle of the area, began a volume at 06:55 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, 6.9 hours before the alert went out and 171 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, Davenport, at 00:00Z on 2011-06-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Davenport, at 00:00Z on 2011-06-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 42 square meters per square second.1939Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1429 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
42 m²/s²
0-3 km storm-relative helicity
238 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

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 15, 1:09 AM CDTSevere Thunderstorm WatchSPCMonroe, Randolph, Saint Clair4 hr
Jun 15, 4:24 AM CDTMesoscale DiscussionSPCAlexander, Bond, Calhoun, Champaign, Christian, Clark and 45 more96 min
Jun 15, 2:13 PM CDTMesoscale DiscussionSPCAlexander, Clay, Clinton, Cumberland, DeWitt, Edwards and 27 more2 hr
Jun 14, 7:47 PM CDTMesoscale DiscussionSPCAdams, Appanoose, Clarke, Davis, Decatur, Lucas and 8 more58 min
Jun 14, 8:54 PM CDTMesoscale DiscussionSPCNewton66 min
Jun 14, 9:11 PM CDTMesoscale DiscussionSPCBarry, Barton, Camden, Cedar, Christian, Dade and 23 more64 min
Jun 15, 12:29 AM CDTMesoscale DiscussionSPCBenton, Bollinger, Butler, Camden, Carter, Cedar and 42 more2 hr
Jun 15, 10:54 AM CDTMesoscale DiscussionSPCPemiscot2 hr

Nearby

Mesoscale Discussions in Illinois, 2011Mesoscale Discussions in Missouri, 2011Mesoscale Discussions in Iowa, 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.