Alert archive / Illinois / Mesoscale Discussions in 2024

Mesoscale Discussion 697

May 8, 202415 counties in Illinois; 8 counties in Kentucky; 11 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at May 8, 2024, 11:28 AM CDT for 15 counties in Illinois; 8 counties in Kentucky; 11 counties in Missouri. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued
May 8, 2024, 11:28 AM CDT (16:28 UTC)
Expired
May 8, 2024, 1:00 PM CDT
In force
92 min
Issued by
the Storm Prediction Center
Concerning
Tornado watch 203
All 34 counties

Alexander County, IL, Franklin County, IL, Gallatin County, IL, Hardin County, IL, Jackson County, IL, Johnson County, IL, Massac County, IL, Monroe County, IL, Perry County, IL, Pope County, IL, Pulaski County, IL, Randolph County, IL, Saline County, IL, Union County, IL, Williamson County, IL, Ballard County, KY, Caldwell County, KY, Carlisle County, KY, Crittenden County, KY, Livingston County, KY, Lyon County, KY, Marshall County, KY, McCracken County, KY, Bollinger County, MO, Cape Girardeau County, MO, Crawford County, MO, Franklin County, MO, Iron County, MO, Jefferson County, MO, Madison County, MO, Perry County, MO, Saint Francois County, MO, Sainte Genevieve County, MO, Washington County, MO

The radar

The Paducah radar (KPAH), 93 km from the middle of the area, began a volume at 16:30 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 289 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 2024-05-08Temperature 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 2024-05-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -112 square meters per square second.1939587897117Sfc1 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
1972 m above ground
0-6 km bulk shear
56 kt
0-1 km storm-relative helicity
-112 m²/s²
0-3 km storm-relative helicity
-56 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 7, 9:20 PM CDTMesoscale DiscussionSPCCrawford, Edwards, Lawrence, Wabash55 min
May 7, 11:16 PM CDTMesoscale DiscussionSPCGallatin, Hamilton, Hardin, Pope, Saline, Wabash and 1 more119 min
May 8, 1:26 AM CDTMesoscale DiscussionSPCAlexander, Gallatin, Hardin, Johnson, Massac, Pope and 2 more2 hr
May 8, 1:57 AM CDTTornado WatchSPCAlexander, Massac, Pope, Pulaski4 hr
May 8, 10:29 AM CDTTornado WatchSPCAlexander, Franklin, Gallatin, Hardin, Jackson, Jefferson and 12 more8 hr
May 8, 11:35 AM CDTMesoscale DiscussionSPCAlexander, Franklin, Gallatin, Hardin, Jackson, Johnson and 9 more85 min
May 8, 12:58 PM CDTMesoscale DiscussionSPCEdwards, Franklin, Gallatin, Hamilton, Hardin, Jefferson and 10 more62 min
May 8, 1:13 PM CDTTornado WatchSPCHamilton, White10 hr
May 8, 1:50 PM CDTMesoscale DiscussionSPCAlexander, Franklin, Gallatin, Hamilton, Hardin, Jackson and 12 more55 min
May 8, 3:41 PM CDTMesoscale DiscussionSPCAlexander, Gallatin, Hardin, Jackson, Johnson, Massac and 5 more94 min
May 8, 4:42 PM CDTTornado WatchSPCAlexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 15 more9 hr
May 7, 8:17 PM CDTTornado WatchSPCBoyd, Carter, Greenup7 hr
May 8, 7:50 AM CDTMesoscale DiscussionSPCCalloway, Graves, McCreary, Trigg, Whitley2 hr
May 8, 5:51 PM CDTMesoscale DiscussionSPCAdair, Allen, Barren, Boyle, Butler, Casey and 18 more114 min
May 8, 6:29 PM CDTMesoscale DiscussionSPCButler, Caldwell, Christian, Daviess, Hopkins, Lyon and 4 more91 min
May 8, 12:56 AM CDTTornado WatchSPCDunklin, Pemiscot5 hr
May 8, 6:14 AM CDTMesoscale DiscussionSPCBates, Benton, Camden, Cass, Cole, Cooper and 11 more2 hr
May 8, 6:50 AM CDTSevere Thunderstorm WatchSPCAndrew, Barton, Bates, Benton, Boone, Buchanan and 39 more10 hr
May 8, 8:58 AM CDTMesoscale DiscussionSPCBenton, Bollinger, Butler, Camden, Cape Girardeau, Carter and 44 more92 min
May 8, 11:01 AM CDTMesoscale DiscussionSPCBarry, Barton, Cedar, Christian, Dade, Dallas and 17 more89 min
May 8, 11:59 AM CDTTornado WatchSPCBarry, Barton, Camden, Cedar, Christian, Dade and 24 more7 hr
May 8, 1:16 PM CDTMesoscale DiscussionSPCBarry, McDonald, Newton, Stone2 hr
May 8, 3:50 PM CDTMesoscale DiscussionSPCBarry, Camden, Christian, Dade, Dallas, Douglas and 15 more115 min
May 8, 5:59 PM CDTMesoscale DiscussionSPCBarry, Christian, Douglas, Howell, McDonald, Stone and 4 more91 min

Nearby

Mesoscale Discussions in Illinois, 2024Mesoscale Discussions in Missouri, 2024Mesoscale Discussions in Kentucky, 2024Every mesoscale discussion in 2024

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.