Alert archive / Illinois / Mesoscale Discussions in 2023

Mesoscale Discussion 1339

June 29, 202336 counties in Illinois; 20 counties in Indiana

The Storm Prediction Center issued this mesoscale discussion at Jun 29, 2023, 12:41 PM CDT for 36 counties in Illinois; 20 counties in Indiana. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Jun 29, 2023, 12:41 PM CDT (17:41 UTC)
Expired
Jun 29, 2023, 2:45 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
Concerning
Severe thunderstorm watch 415
All 56 counties

Champaign County, IL, Clark County, IL, Clay County, IL, Coles County, IL, Cook County, IL, Crawford County, IL, Cumberland County, IL, Douglas County, IL, DuPage County, IL, Edgar County, IL, Edwards County, IL, Effingham County, IL, Fayette County, IL, Ford County, IL, Franklin County, IL, Grundy County, IL, Hamilton County, IL, Iroquois County, IL, Jasper County, IL, Jefferson County, IL, Kankakee County, IL, Kendall County, IL, Lake County, IL, LaSalle County, IL, Lawrence County, IL, Livingston County, IL, Marion County, IL, Moultrie County, IL, Piatt County, IL, Putnam County, IL, Richland County, IL, Shelby County, IL, Vermilion County, IL, Wabash County, IL, Wayne County, IL, Will County, IL, Benton County, IN, Carroll County, IN, Clay County, IN, Fountain County, IN, Greene County, IN, Jasper County, IN, Lake County, IN, Montgomery County, IN, Newton County, IN, Owen County, IN, Parke County, IN, Porter County, IN, Pulaski County, IN, Putnam County, IN, Sullivan County, IN, Tippecanoe County, IN, Vermillion County, IN, Vigo County, IN, Warren County, IN, White County, IN

The radar

The Lincoln radar (KILX), 92 km from the middle of the area, began a volume at 17:45 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, 5.7 hours before the alert went out and 30 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 2023-06-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1628 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 2023-06-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 380 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
1628 J/kg
Mixed-layer CIN
-244 J/kg
Mixed-layer LCL
811 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
380 m²/s²
0-3 km storm-relative helicity
354 m²/s²
Significant tornado parameter
0.0
Supercell composite
11.6

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
Jun 29, 2:20 AM CDTMesoscale DiscussionSPCBond, Champaign, Christian, Clay, Clinton, Coles and 27 more2 hr
Jun 29, 3:08 AM CDTSevere Thunderstorm WatchSPCChampaign, Clark, Clay, Coles, Crawford, Cumberland and 21 more6 hr
Jun 29, 5:18 AM CDTMesoscale DiscussionSPCAdams, Hancock117 min
Jun 29, 5:49 AM CDTSevere Thunderstorm WatchSPCAdams, Brown, Hancock, Henderson, McDonough, Mercer and 2 more6 hr
Jun 29, 6:06 AM CDTMesoscale DiscussionSPCChampaign, Clark, Coles, Crawford, Cumberland, DeWitt and 13 more84 min
Jun 29, 7:22 AM CDTMesoscale DiscussionSPCClark, Crawford, Lawrence53 min
Jun 29, 10:06 AM CDTMesoscale DiscussionSPCAdams, Brown, Cass, DeWitt, Fulton, Hancock and 16 more114 min
Jun 29, 10:34 AM CDTSevere Thunderstorm WatchSPCBond, Bureau, Calhoun, Cass, Champaign, Christian and 59 more6 hr
Jun 29, 12:12 PM CDTMesoscale DiscussionSPCClay, Clinton, Edwards, Franklin, Gallatin, Hamilton and 11 more2 hr
Jun 29, 1:08 PM CDTSevere Thunderstorm WatchSPCEdwards, Franklin, Hamilton, Jefferson, Wabash, Wayne and 1 more8 hr
Jun 29, 3:17 PM CDTSevere Thunderstorm WatchSPCGallatin, Hardin, Pope, Saline, Williamson5 hr
Jun 29, 7:52 AM CDTSevere Thunderstorm WatchSPCCrawford, Dubois, Perry, Spencer, Vanderburgh, Warrick5 hr
Jun 29, 9:36 AM CDTMesoscale DiscussionSPCSpencer114 min
Jun 29, 2:59 PM CDTMesoscale DiscussionSPCBartholomew, Brown, Clark, Crawford, Dearborn, Decatur and 25 more2 hr

Nearby

Mesoscale Discussions in Illinois, 2023Mesoscale Discussions in Indiana, 2023Every mesoscale discussion in 2023

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.