Alert archive / Illinois / Mesoscale Discussions in 2015

Mesoscale Discussion 236

April 8, 201551 counties in Illinois; 43 counties in Indiana; 15 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Apr 8, 2015, 2:43 PM CDT for 51 counties in Illinois; 43 counties in Indiana; 15 counties in Missouri. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued
Apr 8, 2015, 2:43 PM CDT (19:43 UTC)
Expired
Apr 8, 2015, 4:15 PM CDT
In force
92 min
Issued by
the Storm Prediction Center
All 109 counties

Bond County, IL, Brown County, IL, Calhoun County, IL, Cass County, IL, Champaign County, IL, Christian County, IL, Clark County, IL, Clay County, IL, Clinton County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, DeWitt County, IL, Douglas County, IL, Edgar County, IL, Edwards County, IL, Effingham County, IL, Fayette County, IL, Franklin County, IL, Greene County, IL, Hamilton County, IL, Jasper County, IL, Jefferson County, IL, Jersey County, IL, Lawrence County, IL, Logan County, IL, Macon County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Mason County, IL, Menard County, IL, Monroe County, IL, Montgomery County, IL, Morgan County, IL, Moultrie County, IL, Perry County, IL, Piatt County, IL, Pike County, IL, Randolph County, IL, Richland County, IL, Saint Clair County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Shelby County, IL, Vermilion County, IL, Wabash County, IL, Washington County, IL, Wayne County, IL, White County, IL, Bartholomew County, IN, Boone County, IN, Brown County, IN, Clay County, IN, Crawford County, IN, Daviess County, IN, Decatur County, IN, Dubois County, IN, Fayette County, IN, Fountain County, IN, Gibson County, IN, Greene County, IN, Hamilton County, IN, Hancock County, IN, Hendricks County, IN, Henry County, IN, Jackson County, IN, Johnson County, IN, Knox County, IN, Lawrence County, IN, Madison County, IN, Marion County, IN, Martin County, IN, Monroe County, IN, Montgomery County, IN, Morgan County, IN, Orange County, IN, Owen County, IN, Parke County, IN, Perry County, IN, Pike County, IN, Posey County, IN, Putnam County, IN, Rush County, IN, Shelby County, IN, Spencer County, IN, Sullivan County, IN, Vanderburgh County, IN, Vermillion County, IN, Vigo County, IN, Warren County, IN, Warrick County, IN, Washington County, IN, City of Saint Louis, MO, Crawford County, MO, Franklin County, MO, Gasconade County, MO, Jefferson County, MO, Lincoln County, MO, Montgomery County, MO, Phelps County, MO, Pike County, MO, Ralls County, MO, Saint Charles County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Warren County, MO, Washington County, MO

The radar

The Lincoln radar (KILX), 80 km from the middle of the area, began a volume at 19:46 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.

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 7.7 hours before the alert went out and 98 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 12:00Z on 2015-04-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 195 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 12:00Z on 2015-04-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 66 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
195 J/kg
Mixed-layer CIN
-238 J/kg
Mixed-layer LCL
839 m above ground
0-6 km bulk shear
56 kt
0-1 km storm-relative helicity
66 m²/s²
0-3 km storm-relative helicity
142 m²/s²
Significant tornado parameter
0.0
Supercell composite
7.7

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
Apr 8, 7:41 AM CDTMesoscale DiscussionSPCClark, Coles, Cumberland64 min
Apr 8, 12:01 PM CDTMesoscale DiscussionSPCJackson, Monroe, Perry, Randolph, Saint Clair, Washington59 min
Apr 8, 12:50 PM CDTMesoscale DiscussionSPCBond, Calhoun, Champaign, Christian, Clark, Clay and 32 more85 min
Apr 8, 1:05 PM CDTSevere Thunderstorm WatchSPCBond, Calhoun, Champaign, Christian, Clark, Clay and 42 more5 hr
Apr 8, 3:42 PM CDTMesoscale DiscussionSPCFranklin, Gallatin, Hamilton, Jackson, Jefferson, Monroe and 7 more63 min
Apr 8, 4:07 PM CDTTornado WatchSPCEdwards, Franklin, Gallatin, Hamilton, Hardin, Jackson and 13 more4 hr
Apr 8, 9:16 AM CDTMesoscale DiscussionSPCClark, Dearborn, Jefferson, Jennings, Ohio, Ripley and 2 more119 min
Apr 8, 9:34 AM CDTSevere Thunderstorm WatchSPCDearborn, Franklin, Jefferson, Ohio, Ripley, Switzerland5 hr
Apr 7, 8:24 PM CDTSevere Thunderstorm WatchSPCBarton, Bates, Benton, Cass, Cedar, Cooper and 13 more5 hr
Apr 7, 10:13 PM CDTMesoscale DiscussionSPCBarton, Bates, Benton, Cass, Cedar, Henry and 6 more2 hr
Apr 8, 6:17 AM CDTMesoscale DiscussionSPCBates, Benton, Boone, Callaway, Camden, Cass and 19 more88 min
Apr 8, 6:39 AM CDTSevere Thunderstorm WatchSPCAdair, Audrain, Barton, Bates, Benton, Boone and 54 more6 hr
Apr 8, 9:33 AM CDTMesoscale DiscussionSPCAdair, Audrain, Benton, Boone, Caldwell, Callaway and 45 more57 min
Apr 8, 2:21 PM CDTMesoscale DiscussionSPCBarry, Barton, Bates, Benton, Camden, Cass and 16 more114 min
Apr 8, 2:47 PM CDTSevere Thunderstorm WatchSPCBarry, Barton, Bates, Benton, Camden, Cass and 29 more4 hr
Apr 8, 5:45 PM CDTMesoscale DiscussionSPCAudrain, Bates, Benton, Boone, Caldwell, Callaway and 39 more60 min

Nearby

Mesoscale Discussions in Illinois, 2015Mesoscale Discussions in Indiana, 2015Mesoscale Discussions in Missouri, 2015Every mesoscale discussion in 2015

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.