Alert archive / Iowa / Mesoscale Discussions in 2022

Mesoscale Discussion 545

April 23, 20225 states

The Storm Prediction Center issued this mesoscale discussion at Apr 23, 2022, 2:10 PM CDT for 5 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Apr 23, 2022, 2:10 PM CDT (19:10 UTC)
Expired
Apr 23, 2022, 4:15 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
Concerning
Severe potential...watch possible
Chance of a watch
60%
All 65 counties

Adair County, IA, Adams County, IA, Audubon County, IA, Boone County, IA, Bremer County, IA, Butler County, IA, Calhoun County, IA, Carroll County, IA, Cass County, IA, Cerro Gordo County, IA, Chickasaw County, IA, Clarke County, IA, Dallas County, IA, Decatur County, IA, Emmet County, IA, Floyd County, IA, Franklin County, IA, Fremont County, IA, Greene County, IA, Grundy County, IA, Guthrie County, IA, Hamilton County, IA, Hancock County, IA, Hardin County, IA, Humboldt County, IA, Jasper County, IA, Kossuth County, IA, Lucas County, IA, Madison County, IA, Marion County, IA, Marshall County, IA, Mitchell County, IA, Montgomery County, IA, Page County, IA, Palo Alto County, IA, Pocahontas County, IA, Polk County, IA, Ringgold County, IA, Story County, IA, Taylor County, IA, Union County, IA, Warren County, IA, Wayne County, IA, Webster County, IA, Winnebago County, IA, Worth County, IA, Wright County, IA, Atchison County, KS, Brown County, KS, Doniphan County, KS, Blue Earth County, MN, Faribault County, MN, Freeborn County, MN, Martin County, MN, Mower County, MN, Waseca County, MN, Andrew County, MO, Atchison County, MO, DeKalb County, MO, Gentry County, MO, Harrison County, MO, Holt County, MO, Nodaway County, MO, Worth County, MO, Richardson County, NE

The radar

The Des Moines radar (KDMX), 53 km from the middle of the area, began a volume at 19:12 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

Omaha, NE (KOAX), launched 12:00Z, 7.2 hours before the alert went out and 189 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 2022-04-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 12 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 2022-04-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 292 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
12 J/kg
Mixed-layer CIN
-305 J/kg
Mixed-layer LCL
1065 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
292 m²/s²
0-3 km storm-relative helicity
348 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

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 23, 12:03 PM CDTMesoscale DiscussionSPCDickinson, Lyon, O'Brien, Osceola, Sioux87 min
Apr 23, 1:16 PM CDTMesoscale DiscussionSPCPage119 min
Apr 23, 4:01 PM CDTSevere Thunderstorm WatchSPCAdair, Adams, Audubon, Black Hawk, Boone, Bremer and 50 more6 hr
Apr 22, 8:31 PM CDTMesoscale DiscussionSPCDecatur, Finney, Gove, Graham, Gray, Haskell and 6 more119 min
Apr 22, 10:10 PM CDTMesoscale DiscussionSPCCheyenne, Rawlins, Sherman, Wallace2 hr
Apr 22, 10:36 PM CDTSevere Thunderstorm WatchSPCGraham, Norton, Osborne, Phillips, Rooks, Smith6 hr
Apr 23, 12:29 AM CDTMesoscale DiscussionSPCEllis, Finney, Ford, Gove, Grant, Gray and 19 more2 hr
Apr 23, 12:56 AM CDTSevere Thunderstorm WatchSPCBarton, Clark, Edwards, Ellis, Finney, Ford and 15 more4 hr
Apr 23, 2:07 AM CDTMesoscale DiscussionSPCGraham, Norton, Phillips, Smith2 hr
Apr 23, 5:27 PM CDTMesoscale DiscussionSPCAllen, Anderson, Butler, Chase, Coffey, Cowley and 16 more93 min
Apr 23, 6:00 PM CDTSevere Thunderstorm WatchSPCAllen, Anderson, Butler, Chase, Chautauqua, Coffey and 19 more6 hr
Apr 23, 12:55 PM CDTTornado WatchSPCBecker, Big Stone, Chippewa, Clay, Clearwater, Douglas and 16 more6 hr
Apr 23, 6:16 PM CDTMesoscale DiscussionSPCBecker, Beltrami, Clearwater, Hubbard, Mahnomen, Norman and 4 more59 min

Nearby

Mesoscale Discussions in Iowa, 2022Mesoscale Discussions in Missouri, 2022Mesoscale Discussions in Minnesota, 2022Every mesoscale discussion in 2022

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.