Alert archive / Iowa / Mesoscale Discussions in 2022

Mesoscale Discussion 977

May 30, 20224 states

The Storm Prediction Center issued this mesoscale discussion at May 30, 2022, 1:34 PM CDT for 4 states. It was in force for 86 min.

The area

The outline as issued.

The facts

Issued: May 30, 2022, 1:34 PM CDT (18:34 UTC)
Expired: May 30, 2022, 3:00 PM CDT
In force: 86 min
Issued by: the Storm Prediction Center
Concerning: Tornado watch 292

All 38 counties

Cherokee County, IA, Clay County, IA, Dickinson County, IA, Ida County, IA, Lyon County, IA, Monona County, IA, O'Brien County, IA, Osceola County, IA, Plymouth County, IA, Sioux County, IA, Woodbury County, IA, Cottonwood County, MN, Jackson County, MN, Lincoln County, MN, Lyon County, MN, Murray County, MN, Nobles County, MN, Pipestone County, MN, Rock County, MN, Burt County, NE, Cedar County, NE, Cuming County, NE, Dakota County, NE, Dixon County, NE, Dodge County, NE, Stanton County, NE, Thurston County, NE, Wayne County, NE, Brookings County, SD, Clay County, SD, Lake County, SD, Lincoln County, SD, McCook County, SD, Minnehaha County, SD, Moody County, SD, Turner County, SD, Union County, SD, Yankton County, SD

The radar

The Sioux Falls radar (KFSD), 68 km from the middle of the area, began a volume at 18:38 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.

Tornado Watch 293May 30, 2:30 PM CDT

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 6.6 hours before the alert went out and 191 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1569 J/kg
Mixed-layer CIN: -154 J/kg
Mixed-layer LCL: 897 m above ground
0-6 km bulk shear: 61 kt
0-1 km storm-relative helicity: 211 m²/s²
0-3 km storm-relative helicity: 433 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 3.2

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.

Issued	Product	Office	Counties	Lasted
May 29, 11:25 PM CDT	Mesoscale Discussion	SPC	Lyon, Osceola, Sioux	95 min
May 30, 12:03 AM CDT	Severe Thunderstorm Watch	SPC	Buena Vista, Cherokee, Clay, Dickinson, Emmet, Ida and 9 more	8 hr
May 30, 2:21 AM CDT	Mesoscale Discussion	SPC	Buena Vista, Cherokee, Clay, Dickinson, Emmet, Lyon and 5 more	84 min
May 30, 5:40 AM CDT	Mesoscale Discussion	SPC	Audubon, Buena Vista, Calhoun, Carroll, Cass, Cherokee and 20 more	95 min
May 30, 9:27 AM CDT	Mesoscale Discussion	SPC	Lyon, O'Brien, Osceola, Plymouth, Sioux	93 min
May 30, 11:28 AM CDT	Mesoscale Discussion	SPC	Lyon, Osceola, Plymouth, Sioux	92 min
May 30, 11:49 AM CDT	Tornado Watch	SPC	Buena Vista, Cherokee, Clay, Dickinson, Ida, Lyon and 6 more	6 hr
May 30, 1:55 PM CDT	Mesoscale Discussion	SPC	Adams, Audubon, Cass, Crawford, Fremont, Harrison and 6 more	2 hr
May 30, 5:23 PM CDT	Tornado Watch	SPC	Adair, Adams, Audubon, Boone, Calhoun, Carroll and 36 more	5 hr
May 30, 6:51 PM CDT	Mesoscale Discussion	SPC	Dickinson, Osceola	54 min
May 29, 8:31 PM CDT	Mesoscale Discussion	SPC	Beltrami, Kittson, Koochiching, Lake of the Woods, Marshall, Pennington and 2 more	89 min
May 30, 2:03 AM CDT	Mesoscale Discussion	SPC	Aitkin, Becker, Cass, Clay, Clearwater, Crow Wing and 7 more	117 min
May 30, 2:46 AM CDT	Severe Thunderstorm Watch	SPC	Aitkin, Becker, Beltrami, Carlton, Cass, Clay and 14 more	5 hr
May 30, 4:58 AM CDT	Mesoscale Discussion	SPC	Aitkin, Becker, Beltrami, Benton, Carlton, Cass and 20 more	92 min
May 30, 12:55 PM CDT	Mesoscale Discussion	SPC	Benton, Chippewa, Isanti, Kanabec, Kandiyohi, McLeod and 9 more	65 min
May 30, 2:06 PM CDT	Mesoscale Discussion	SPC	Aitkin, Anoka, Benton, Big Stone, Blue Earth, Brown and 40 more	84 min
May 30, 2:37 PM CDT	Tornado Watch PDS	SPC	Aitkin, Anoka, Becker, Benton, Big Stone, Blue Earth and 51 more	7 hr
May 30, 4:54 PM CDT	Mesoscale Discussion	SPC	Benton, Brown, Cottonwood, Crow Wing, Douglas, Jackson and 13 more	96 min
May 29, 7:16 PM CDT	Tornado Watch	SPC	Adams, Antelope, Blaine, Boone, Boyd, Brown and 45 more	8 hr
May 29, 9:16 PM CDT	Mesoscale Discussion	SPC	Adams, Antelope, Blaine, Boone, Boyd, Brown and 43 more	89 min
May 30, 2:03 PM CDT	Mesoscale Discussion	SPC	Blaine, Brown, Cherry, Keya Paha, Loup, Rock	87 min

Nearby

Mesoscale Discussions in Iowa, 2022 Mesoscale Discussions in South Dakota, 2022 Mesoscale Discussions in Nebraska, 2022 Every 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.