Alert archive / Nebraska / Mesoscale Discussions in 2022

Mesoscale Discussion 744

May 12, 20227 counties in Iowa; 13 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at May 12, 2022, 6:12 PM CDT for 7 counties in Iowa; 13 counties in Nebraska. It was in force for 63 min.

The area

The outline as issued.

The facts

Issued: May 12, 2022, 6:12 PM CDT (23:12 UTC)
Expired: May 12, 2022, 7:15 PM CDT
In force: 63 min
Issued by: the Storm Prediction Center
Concerning: Severe thunderstorm watch 208

Counties Cherokee County, IA, Crawford County, IA, Harrison County, IA, Ida County, IA, Monona County, IA, Sac County, IA, Woodbury County, IA, Burt County, NE, Butler County, NE, Colfax County, NE, Cuming County, NE, Dakota County, NE, Dodge County, NE, Douglas County, NE, Saunders County, NE, Seward County, NE, Stanton County, NE, Thurston County, NE, Washington County, NE, Wayne County, NE

The radar

The Omaha radar (KOAX), 48 km from the middle of the area, began a volume at 23:15 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.

Severe Thunderstorm Watch 212May 12, 6:55 PM CDT

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 11.2 hours before the alert went out and 48 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: 1555 J/kg
Mixed-layer CIN: -323 J/kg
Mixed-layer LCL: 1486 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: -31 m²/s²
0-3 km storm-relative helicity: -52 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.

Issued	Product	Office	Counties	Lasted
May 11, 7:01 PM CDT	Mesoscale Discussion	SPC	Dickinson, Emmet, Kossuth, Winnebago	59 min
May 12, 2:14 PM CDT	Severe Thunderstorm Watch	SPC	Fremont, Harrison, Mills, Monona, Pottawattamie, Shelby	8 hr
May 12, 3:27 PM CDT	Severe Thunderstorm Watch PDS	SPC	Buena Vista, Cherokee, Clay, Dickinson, Ida, Lyon and 5 more	7 hr
May 12, 4:32 PM CDT	Mesoscale Discussion	SPC	Lyon, Plymouth, Sioux	58 min
May 11, 11:50 PM CDT	Mesoscale Discussion	SPC	Boyd, Keya Paha, Rock	115 min
May 12, 1:39 PM CDT	Mesoscale Discussion	SPC	Adams, Antelope, Boone, Boyd, Buffalo, Cedar and 27 more	3 hr
May 12, 2:42 PM CDT	Mesoscale Discussion	SPC	Antelope, Boone, Cedar, Garfield, Greeley, Howard and 11 more	2 hr
May 12, 5:07 PM CDT	Mesoscale Discussion	SPC	Butler, Cass, Clay, Colfax, Dodge, Douglas and 17 more	53 min
May 12, 5:43 PM CDT	Mesoscale Discussion	SPC	Franklin, Furnas, Gosper, Harlan, Kearney, Phelps	62 min

Nearby

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