Alert archive / Iowa / Mesoscale Discussions in 2023

Mesoscale Discussion 412

March 31, 20234 states

The Storm Prediction Center issued this mesoscale discussion at Mar 31, 2023, 5:30 PM CDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Mar 31, 2023, 5:30 PM CDT (22:30 UTC)
Expired
Mar 31, 2023, 7:30 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
Concerning
Tornado watch 93
All 79 counties

Allamakee County, IA, Benton County, IA, Black Hawk County, IA, Bremer County, IA, Buchanan County, IA, Butler County, IA, Cedar County, IA, Chickasaw County, IA, Clayton County, IA, Clinton County, IA, Delaware County, IA, Des Moines County, IA, Dubuque County, IA, Fayette County, IA, Floyd County, IA, Grundy County, IA, Hardin County, IA, Henry County, IA, Howard County, IA, Iowa County, IA, Jackson County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Lee County, IA, Linn County, IA, Louisa County, IA, Mahaska County, IA, Marshall County, IA, Muscatine County, IA, Poweshiek County, IA, Scott County, IA, Tama County, IA, Van Buren County, IA, Wapello County, IA, Washington County, IA, Winneshiek County, IA, Adams County, IL, Brown County, IL, Bureau County, IL, Calhoun County, IL, Carroll County, IL, Cass County, IL, Fulton County, IL, Greene County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Jersey County, IL, Jo Daviess County, IL, Knox County, IL, Logan County, IL, Macoupin County, IL, Marshall County, IL, Mason County, IL, McDonough County, IL, Menard County, IL, Mercer County, IL, Morgan County, IL, Peoria County, IL, Pike County, IL, Rock Island County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Stark County, IL, Tazewell County, IL, Warren County, IL, Whiteside County, IL, Woodford County, IL, Clark County, MO, Lewis County, MO, Lincoln County, MO, Marion County, MO, Pike County, MO, Ralls County, MO, Crawford County, WI, Grant County, WI

The radar

The Quad Cities radar (KDVN), 52 km from the middle of the area, began a volume at 22:30 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 nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 10.5 hours before the alert went out and 58 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, 1:32 PM CDTMesoscale DiscussionSPCAdams, Brown, Fulton, Hancock, Knox, McDonough and 5 more118 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, 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, 12:51 PM CDTMesoscale DiscussionSPCAppanoose, Clarke, Decatur, Jasper, Lucas, Mahaska and 5 more84 min
Mar 31, 3:54 PM CDTMesoscale DiscussionSPCIowa, Johnson, Keokuk, Wapello, Washington36 min
Mar 31, 3:59 PM CDTMesoscale DiscussionSPCIowa, Johnson, Keokuk, Wapello, Washington31 min
Mar 31, 10:44 AM CDTMesoscale DiscussionSPCDunklin2 hr
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
Mar 30, 10:04 PM CDTMesoscale DiscussionSPCAshland, Bayfield, Douglas, Florence, Forest, Iron and 9 more26 min
Mar 31, 3:38 PM CDTMesoscale DiscussionSPCAdams, Columbia, Dodge, Juneau, La Crosse, Marquette and 2 more2 hr

Nearby

Mesoscale Discussions in Iowa, 2023Mesoscale 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.