Alert archive / Iowa / Mesoscale Discussions in 2024

Mesoscale Discussion 461

April 16, 202422 counties in Iowa; 7 counties in Nebraska; Union County, South Dakota

The Storm Prediction Center issued this mesoscale discussion at Apr 16, 2024, 2:03 PM CDT for 22 counties in Iowa; 7 counties in Nebraska; Union County, South Dakota. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued
Apr 16, 2024, 2:03 PM CDT (19:03 UTC)
Expired
Apr 16, 2024, 3:30 PM CDT
In force
87 min
Issued by
the Storm Prediction Center
Concerning
Tornado watch 118
All 30 counties

Audubon County, IA, Buena Vista County, IA, Calhoun County, IA, Carroll County, IA, Cherokee County, IA, Clay County, IA, Crawford County, IA, Dickinson County, IA, Greene County, IA, Harrison County, IA, Ida County, IA, Lyon County, IA, Monona County, IA, O'Brien County, IA, Osceola County, IA, Palo Alto County, IA, Plymouth County, IA, Pocahontas County, IA, Sac County, IA, Shelby County, IA, Sioux County, IA, Woodbury County, IA, Burt County, NE, Cuming County, NE, Dakota County, NE, Dixon County, NE, Dodge County, NE, Thurston County, NE, Washington County, NE, Union County, SD

The radar

The Omaha radar (KOAX), 123 km from the middle of the area, began a volume at 19:06 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

Omaha, NE (KOAX), launched 12:00Z, 7.1 hours before the alert went out and 123 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, Omaha, NE at 12:00Z on 2024-04-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 852 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, Omaha, NE at 12:00Z on 2024-04-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 70 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
852 J/kg
Mixed-layer CIN
-86 J/kg
Mixed-layer LCL
1959 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
70 m²/s²
0-3 km storm-relative helicity
211 m²/s²
Significant tornado parameter
0.0
Supercell composite
4.0

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
Apr 16, 2:14 AM CDTTornado WatchSPCFremont, Harrison, Mills, Pottawattamie6 hr
Apr 16, 6:00 AM CDTMesoscale DiscussionSPCFremont, Harrison, Mills, Montgomery, Page, Pottawattamie2 hr
Apr 16, 8:50 AM CDTMesoscale DiscussionSPCAdair, Adams, Appanoose, Audubon, Boone, Cass and 37 more55 min
Apr 16, 10:22 AM CDTTornado WatchSPCAdair, Adams, Appanoose, Black Hawk, Boone, Bremer and 28 more8 hr
Apr 16, 11:04 AM CDTMesoscale DiscussionSPCHenry, Jefferson, Lee, Van Buren2 hr
Apr 16, 11:43 AM CDTMesoscale DiscussionSPCAudubon, Buena Vista, Calhoun, Carroll, Cherokee, Clay and 13 more92 min
Apr 16, 12:06 PM CDTTornado WatchSPCBenton, Buchanan, Cedar, Chickasaw, Clayton, Clinton and 19 more10 hr
Apr 16, 12:23 PM CDTTornado WatchSPCAudubon, Buena Vista, Calhoun, Carroll, Cass, Cherokee and 25 more7 hr
Apr 16, 1:56 PM CDTMesoscale DiscussionSPCAppanoose, Benton, Black Hawk, Bremer, Buchanan, Butler and 34 more64 min
Apr 16, 3:36 PM CDTMesoscale DiscussionSPCBoone, Buena Vista, Calhoun, Carroll, Cherokee, Clay and 24 more54 min
Apr 16, 4:47 PM CDTMesoscale DiscussionSPCCedar, Clinton, Des Moines, Henry, Jackson, Johnson and 6 more88 min
Apr 16, 6:12 PM CDTMesoscale DiscussionSPCBenton, Black Hawk, Bremer, Butler, Cerro Gordo, Chickasaw and 16 more63 min
Apr 15, 7:13 PM CDTMesoscale DiscussionSPCFranklin, Harlan, Phelps3 hr
Apr 15, 8:00 PM CDTMesoscale DiscussionSPCBlaine, Brown, Cherry, Hooker, Keya Paha, McPherson and 1 more90 min
Apr 15, 8:07 PM CDTTornado WatchSPCAdams, Buffalo, Dawson, Franklin, Furnas, Gosper and 5 more8 hr
Apr 15, 9:07 PM CDTMesoscale DiscussionSPCBoone, Butler, Cass, Colfax, Fillmore, Gage and 19 more2 hr
Apr 15, 11:29 PM CDTMesoscale DiscussionSPCFranklin, Harlan, Webster2 hr
Apr 16, 1:42 AM CDTMesoscale DiscussionSPCAdams, Buffalo, Clay, Fillmore, Franklin, Gage and 17 more63 min
Apr 16, 3:22 AM CDTMesoscale DiscussionSPCBoone, Butler, Clay, Colfax, Fillmore, Greeley and 16 more53 min

Nearby

Mesoscale Discussions in Iowa, 2024Mesoscale Discussions in Nebraska, 2024Mesoscale Discussions in South Dakota, 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.