Alert archive / Iowa / Mesoscale Discussions in 2022

Mesoscale Discussion 984

May 30, 20224 states

The Storm Prediction Center issued this mesoscale discussion at May 30, 2022, 7:30 PM CDT for 4 states. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued
May 30, 2022, 7:30 PM CDT (00:30 UTC)
Expired
May 30, 2022, 9:00 PM CDT
In force
90 min
Issued by
the Storm Prediction Center
Concerning
Tornado watch 294
All 70 counties

Adair County, IA, Adams County, IA, Audubon County, IA, Boone County, IA, Calhoun County, IA, Carroll County, IA, Cass County, IA, Cerro Gordo County, IA, Crawford County, IA, Dallas County, IA, Emmet County, IA, Franklin County, IA, Fremont County, IA, Greene County, IA, Guthrie County, IA, Hamilton County, IA, Hancock County, IA, Humboldt County, IA, Kossuth County, IA, Madison County, IA, Mills County, IA, Mitchell County, IA, Montgomery County, IA, Page County, IA, Palo Alto County, IA, Pocahontas County, IA, Pottawattamie County, IA, Sac County, IA, Shelby County, IA, Taylor County, IA, Union County, IA, Webster County, IA, Winnebago County, IA, Worth County, IA, Wright County, IA, Atchison County, KS, Brown County, KS, Butler County, KS, Chase County, KS, Cowley County, KS, Dickinson County, KS, Doniphan County, KS, Elk County, KS, Geary County, KS, Greenwood County, KS, Harper County, KS, Harvey County, KS, Jackson County, KS, Jefferson County, KS, Lyon County, KS, Marion County, KS, Marshall County, KS, Morris County, KS, Nemaha County, KS, Osage County, KS, Pottawatomie County, KS, Riley County, KS, Sedgwick County, KS, Shawnee County, KS, Sumner County, KS, Wabaunsee County, KS, Andrew County, MO, Atchison County, MO, Holt County, MO, Nodaway County, MO, Johnson County, NE, Nemaha County, NE, Otoe County, NE, Pawnee County, NE, Richardson County, NE

The radar

The Topeka radar (KTWX), 64 km from the middle of the area, began a volume at 00:29 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

Topeka, KS (KTOP), launched 00:00Z, 0.5 hours before the alert went out and 75 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, Topeka, KS at 00:00Z on 2022-05-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1601 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, Topeka, KS at 00:00Z on 2022-05-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 170 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
1601 J/kg
Mixed-layer CIN
-16 J/kg
Mixed-layer LCL
1401 m above ground
0-6 km bulk shear
69 kt
0-1 km storm-relative helicity
170 m²/s²
0-3 km storm-relative helicity
111 m²/s²
Significant tornado parameter
0.9
Supercell composite
7.9

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 30, 7:06 PM CDTSevere Thunderstorm WatchSPCChickasaw, Floyd, Howard, Mitchell7 hr
May 30, 9:39 PM CDTMesoscale DiscussionSPCAdair, Adams, Audubon, Boone, Cass, Clarke and 15 more66 min
May 30, 9:54 PM CDTSevere Thunderstorm WatchSPCAdair, Adams, Audubon, Black Hawk, Boone, Bremer and 36 more6 hr
May 30, 11:27 PM CDTMesoscale DiscussionSPCCerro Gordo, Chickasaw, Floyd, Howard, Mitchell, Winneshiek and 1 more63 min
May 31, 6:22 PM CDTMesoscale DiscussionSPCClinton, Davis, Des Moines, Henry, Jefferson, Lee and 5 more83 min
May 31, 1:22 AM CDTMesoscale DiscussionSPCAtchison, Doniphan, Douglas, Franklin, Jackson, Jefferson and 9 more83 min
May 31, 2:29 PM CDTSevere Thunderstorm WatchSPCButler, Chautauqua, Cowley, Elk, Greenwood, Harper and 4 more10 hr
May 31, 2:44 PM CDTMesoscale DiscussionSPCAllen, Bourbon, Chautauqua, Cherokee, Cowley, Crawford and 7 more2 hr
May 31, 5:53 PM CDTMesoscale DiscussionSPCSumner97 min
May 31, 3:40 PM CDTMesoscale DiscussionSPCAudrain, Boone, Callaway, Cole, Gasconade, Lewis and 11 more2 hr

Nearby

Mesoscale Discussions in Iowa, 2022Mesoscale Discussions in Kansas, 2022Mesoscale Discussions in Nebraska, 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.