Alert archive / Iowa / Mesoscale Discussions in 2022

Mesoscale Discussion 830

May 19, 202213 counties in Iowa; 8 counties in Minnesota

The Storm Prediction Center issued this mesoscale discussion at May 19, 2022, 1:36 PM CDT for 13 counties in Iowa; 8 counties in Minnesota. It was in force for 114 min.

The area

The outline as issued.

The facts

Issued: May 19, 2022, 1:36 PM CDT (18:36 UTC)
Expired: May 19, 2022, 3:30 PM CDT
In force: 114 min
Issued by: the Storm Prediction Center
Concerning: Severe potential...tornado watch likely
Chance of a watch: 95%

All 21 counties

Cerro Gordo County, IA, Dickinson County, IA, Emmet County, IA, Floyd County, IA, Franklin County, IA, Hancock County, IA, Humboldt County, IA, Kossuth County, IA, Mitchell County, IA, Palo Alto County, IA, Winnebago County, IA, Worth County, IA, Wright County, IA, Blue Earth County, MN, Faribault County, MN, Freeborn County, MN, Martin County, MN, Mower County, MN, Steele County, MN, Waseca County, MN, Watonwan County, MN

The radar

The Minneapolis radar (KMPX), 157 km from the middle of the area, began a volume at 18:36 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

Minneapolis, MN (KMPX), launched 12:00Z, 6.6 hours before the alert went out and 157 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1537 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 3 m²/s²
0-3 km storm-relative helicity: 68 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 19, 11:36 AM CDT	Mesoscale Discussion	SPC	Allamakee, Cerro Gordo, Chickasaw, Floyd, Howard, Mitchell and 3 more	84 min
May 19, 3:11 PM CDT	Tornado Watch	SPC	Emmet, Kossuth, Mitchell, Winnebago, Worth	7 hr
May 19, 4:54 PM CDT	Mesoscale Discussion	SPC	Howard, Mitchell, Winneshiek, Worth	2 hr
May 19, 3:20 PM CDT	Severe Thunderstorm Watch	SPC	Anoka, Carver, Chisago, Dakota, Hennepin, Isanti and 6 more	7 hr

Nearby

Mesoscale Discussions in Iowa, 2022 Mesoscale Discussions in Minnesota, 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.