Alert archive / Illinois / Mesoscale Discussions in 2013

Mesoscale Discussion 876

May 30, 201353 counties in Illinois; 6 counties in Iowa; 29 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at May 30, 2013, 11:29 AM CDT for 53 counties in Illinois; 6 counties in Iowa; 29 counties in Missouri. It was in force for 61 min.

The area

The outline as issued.

The facts

Issued
May 30, 2013, 11:29 AM CDT (16:29 UTC)
Expired
May 30, 2013, 12:30 PM CDT
In force
61 min
Issued by
the Storm Prediction Center
Chance of a watch
95%
All 88 counties

Des Moines County, IA, Henry County, IA, Lee County, IA, Louisa County, IA, Muscatine County, IA, Scott County, IA, Adams County, IL, Bond County, IL, Brown County, IL, Bureau County, IL, Calhoun County, IL, Cass County, IL, Christian County, IL, Clinton County, IL, DeWitt County, IL, Fayette County, IL, Fulton County, IL, Greene County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Jackson County, IL, Jersey County, IL, Knox County, IL, LaSalle County, IL, Livingston County, IL, Logan County, IL, Macon County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Marshall County, IL, Mason County, IL, McDonough County, IL, McLean County, IL, Menard County, IL, Mercer County, IL, Monroe County, IL, Montgomery County, IL, Morgan County, IL, Moultrie County, IL, Peoria County, IL, Perry County, IL, Piatt County, IL, Pike County, IL, Putnam County, IL, Randolph County, IL, Rock Island County, IL, Saint Clair County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Shelby County, IL, Stark County, IL, Tazewell County, IL, Warren County, IL, Washington County, IL, Whiteside County, IL, Woodford County, IL, Bollinger County, MO, Cape Girardeau County, MO, Carter County, MO, City of Saint Louis, MO, Clark County, MO, Crawford County, MO, Dent County, MO, Franklin County, MO, Gasconade County, MO, Iron County, MO, Jefferson County, MO, Lewis County, MO, Lincoln County, MO, Madison County, MO, Marion County, MO, Montgomery County, MO, Perry County, MO, Pike County, MO, Ralls County, MO, Reynolds County, MO, Ripley County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Shannon County, MO, Warren County, MO, Washington County, MO, Wayne County, MO

The radar

The St Louis radar (KLSX), 104 km from the middle of the area, began a volume at 16:32 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, 4.5 hours before the alert went out and 160 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 2013-05-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1076 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 2013-05-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 218 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
1076 J/kg
Mixed-layer CIN
-48 J/kg
Mixed-layer LCL
826 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
218 m²/s²
0-3 km storm-relative helicity
221 m²/s²
Significant tornado parameter
1.1
Supercell composite
6.2

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
May 30, 11:20 AM CDTMesoscale DiscussionSPCJo Daviess, Stephenson115 min
May 30, 12:32 PM CDTTornado WatchSPCAdams, Bond, Boone, Brown, Bureau, Calhoun and 57 more7 hr
May 30, 2:16 PM CDTMesoscale DiscussionSPCAdams, Bond, Boone, Brown, Bureau, Calhoun and 53 more59 min
May 30, 3:52 PM CDTMesoscale DiscussionSPCAdams, Bond, Boone, Brown, Bureau, Calhoun and 56 more113 min
May 30, 5:48 PM CDTSevere Thunderstorm WatchSPCCook, DuPage, Ford, Grundy, Iroquois, Kane and 5 more6 hr
May 29, 9:00 PM CDTMesoscale DiscussionSPCAllamakee, Appanoose, Benton, Buchanan, Clayton, Davis and 16 more60 min
May 29, 9:36 PM CDTMesoscale DiscussionSPCAdair, Buena Vista, Calhoun, Carroll, Clay, Emmet and 6 more54 min
May 30, 11:56 AM CDTTornado WatchSPCAllamakee, Clayton, Fayette, Winneshiek7 hr
May 30, 1:33 PM CDTMesoscale DiscussionSPCAllamakee, Clayton, Fayette, Winneshiek57 min
May 30, 3:34 PM CDTMesoscale DiscussionSPCAllamakee, Clayton, Fayette, Winneshiek116 min
May 30, 5:58 PM CDTMesoscale DiscussionSPCClayton62 min
May 30, 11:44 AM CDTMesoscale DiscussionSPCBarry, Barton, Benton, Camden, Cedar, Christian and 23 more91 min
May 30, 1:21 PM CDTTornado WatchSPCBarry, Barton, Benton, Camden, Cedar, Chariton and 37 more8 hr
May 30, 2:35 PM CDTMesoscale DiscussionSPCBarry, Jasper, McDonald, Newton55 min
May 30, 5:23 PM CDTMesoscale DiscussionSPCBarry, Camden, Christian, Dallas, Douglas, Greene and 13 more2 hr

Nearby

Mesoscale Discussions in Illinois, 2013Mesoscale Discussions in Missouri, 2013Mesoscale Discussions in Iowa, 2013Every mesoscale discussion in 2013

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.