Alert archive / Illinois / Mesoscale Discussions in 2023

Mesoscale Discussion 397

March 31, 202311 counties in Illinois; Clark County, Lewis County, Missouri

The Storm Prediction Center issued this mesoscale discussion at Mar 31, 2023, 1:32 PM CDT for 11 counties in Illinois; Clark County, Lewis County, Missouri. It was in force for 118 min.

The area

The outline as issued.

The facts

Issued
Mar 31, 2023, 1:32 PM CDT (18:32 UTC)
Expired
Mar 31, 2023, 3:30 PM CDT
In force
118 min
Issued by
the Storm Prediction Center
Concerning
Tornado watch 93

Counties Adams County, IL, Brown County, IL, Fulton County, IL, Hancock County, IL, Knox County, IL, Mason County, IL, McDonough County, IL, Peoria County, IL, Schuyler County, IL, Tazewell County, IL, Warren County, IL, Clark County, MO, Lewis County, MO

The radar

The Lincoln radar (KILX), 124 km from the middle of the area, began a volume at 18:31 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

Davenport, (KDVN), launched 12:00Z, 6.5 hours before the alert went out and 139 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, Davenport, at 12:00Z on 2023-03-31Temperature 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, Davenport, at 12:00Z on 2023-03-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 433 square meters per square second.1939587897Sfc1 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
897 m above ground
0-6 km bulk shear
67 kt
0-1 km storm-relative helicity
433 m²/s²
0-3 km storm-relative helicity
424 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
Mar 31, 8:36 AM CDTMesoscale DiscussionSPCAdams, Brown, Calhoun, Greene, Hancock, Jersey and 8 more84 min
Mar 31, 10:37 AM CDTMesoscale DiscussionSPCAdams, Brown, Cass, Fulton, Hancock, Henderson and 10 more53 min
Mar 31, 11:24 AM CDTMesoscale DiscussionSPCAdams, Brown, Bureau, Calhoun, Carroll, Cass and 27 more96 min
Mar 31, 11:46 AM CDTTornado Watch PDSSPCAdams, Brown, Bureau, Calhoun, Carroll, Cass and 36 more8 hr
Mar 31, 12:28 PM CDTTornado Watch PDSSPCAlexander, Bond, Clinton, Fayette, Franklin, Jackson and 14 more11 hr
Mar 31, 12:53 PM CDTMesoscale DiscussionSPCAlexander, Clinton, Franklin, Jackson, Jefferson, Johnson and 10 more97 min
Mar 31, 2:07 PM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, Cook, DeKalb, DuPage and 26 more83 min
Mar 31, 2:36 PM CDTTornado WatchSPCBoone, Cook, DeKalb, DuPage, Ford, Grundy and 12 more7 hr
Mar 31, 3:17 PM CDTMesoscale DiscussionSPCAdams, Brown, Calhoun, Cass, Fulton, Greene and 20 more88 min
Mar 31, 3:50 PM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, Cook, DeKalb, DuPage and 21 more55 min
Mar 31, 5:18 PM CDTMesoscale DiscussionSPCAdams, Brown, Bureau, Calhoun, Carroll, Cass and 27 more117 min
Mar 31, 5:30 PM CDTMesoscale DiscussionSPCAdams, Brown, Bureau, Calhoun, Carroll, Cass and 27 more2 hr
Mar 31, 6:20 PM CDTMesoscale DiscussionSPCChampaign, Clark, Coles, Cook, Crawford, Cumberland and 21 more115 min
Mar 31, 6:59 PM CDTTornado WatchSPCChampaign, Christian, Clark, Clay, Coles, Crawford and 21 more7 hr
Mar 31, 10:44 AM CDTMesoscale DiscussionSPCDunklin2 hr
Mar 31, 12:51 PM CDTMesoscale DiscussionSPCHarrison, Mercer84 min
Mar 31, 1:36 PM CDTMesoscale DiscussionSPCAdair, Carroll, Chariton, Cooper, Grundy, Howard and 12 more114 min
Mar 31, 3:42 PM CDTMesoscale DiscussionSPCDunklin, Pemiscot93 min

Nearby

Mesoscale Discussions in Illinois, 2023Mesoscale Discussions in Missouri, 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.