Alert archive / Illinois / Mesoscale Discussions in 2019

Mesoscale Discussion 891

May 29, 201939 counties in Illinois; 12 counties in Indiana; 20 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at May 29, 2019, 3:48 PM CDT for 39 counties in Illinois; 12 counties in Indiana; 20 counties in Missouri. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued
May 29, 2019, 3:48 PM CDT (20:48 UTC)
Expired
May 29, 2019, 5:15 PM CDT
In force
87 min
Issued by
the Storm Prediction Center
Chance of a watch
40%
All 71 counties

Alexander County, IL, Bond County, IL, Calhoun County, IL, Christian County, IL, Clark County, IL, Clay County, IL, Clinton County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, Douglas County, IL, Edgar County, IL, Effingham County, IL, Fayette County, IL, Franklin County, IL, Greene County, IL, Jackson County, IL, Jasper County, IL, Jefferson County, IL, Jersey County, IL, Lawrence County, IL, Macon County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Monroe County, IL, Montgomery County, IL, Moultrie County, IL, Perry County, IL, Pulaski County, IL, Randolph County, IL, Richland County, IL, Saint Clair County, IL, Sangamon County, IL, Shelby County, IL, Union County, IL, Washington County, IL, Wayne County, IL, Williamson County, IL, Clay County, IN, Greene County, IN, Hendricks County, IN, Johnson County, IN, Marion County, IN, Monroe County, IN, Morgan County, IN, Owen County, IN, Parke County, IN, Putnam County, IN, Sullivan County, IN, Vigo County, IN, Bollinger County, MO, Cape Girardeau County, MO, City of Saint Louis, MO, Franklin County, MO, Gasconade County, MO, Iron County, MO, Jefferson County, MO, Lincoln County, MO, Madison County, MO, Perry County, MO, Reynolds County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Scott County, MO, Stoddard County, MO, Warren County, MO, Washington County, MO, Wayne County, MO

The radar

The St Louis radar (KLSX), 128 km from the middle of the area, began a volume at 20:51 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, 8.8 hours before the alert went out and 225 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 2019-05-29Temperature 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, Lincoln, IL at 12:00Z on 2019-05-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -38 square meters per square second.19395878Sfc1 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
1016 m above ground
0-6 km bulk shear
54 kt
0-1 km storm-relative helicity
-38 m²/s²
0-3 km storm-relative helicity
174 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 28, 8:48 PM CDTSevere Thunderstorm WatchSPCFord, Grundy, Iroquois, Kankakee, LaSalle, Livingston4 hr
May 29, 9:06 AM CDTMesoscale DiscussionSPCHardin, Massac, Pope114 min
May 29, 4:34 PM CDTSevere Thunderstorm WatchSPCBond, Calhoun, Clinton, Fayette, Greene, Jersey and 8 more3 hr
May 29, 6:17 PM CDTMesoscale DiscussionSPCMercer, Rock Island118 min
May 28, 9:36 PM CDTSevere Thunderstorm WatchSPCAndrew, Atchison, Buchanan, Caldwell, Carroll, Cass and 17 more4 hr
May 28, 9:52 PM CDTMesoscale DiscussionSPCAndrew, Atchison, Buchanan, Caldwell, Clay, Clinton and 12 more53 min
May 29, 1:07 AM CDTMesoscale DiscussionSPCTaney113 min
May 29, 6:06 AM CDTSevere Thunderstorm WatchSPCDunklin, Pemiscot2 hr
May 29, 9:40 AM CDTMesoscale DiscussionSPCBarry, Jasper, Lawrence, McDonald, Newton, Stone65 min
May 29, 10:04 AM CDTSevere Thunderstorm WatchSPCBarry, Barton, Benton, Camden, Cedar, Christian and 24 more7 hr
May 29, 1:32 PM CDTMesoscale DiscussionSPCBarry, Camden, Christian, Dallas, Douglas, Greene and 13 more58 min

Nearby

Mesoscale Discussions in Illinois, 2019Mesoscale Discussions in Missouri, 2019Mesoscale Discussions in Indiana, 2019Every mesoscale discussion in 2019

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.