Alert archive / Minnesota / Mesoscale Discussions in 2018

Mesoscale Discussion 563

May 29, 201816 counties in Iowa; 19 counties in Minnesota

The Storm Prediction Center issued this mesoscale discussion at May 29, 2018, 1:22 PM CDT for 16 counties in Iowa; 19 counties in Minnesota. It was in force for 83 min.

The area

The outline as issued.

The facts

Issued: May 29, 2018, 1:22 PM CDT (18:22 UTC)
Expired: May 29, 2018, 2:45 PM CDT
In force: 83 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

All 35 counties

Buena Vista County, IA, Calhoun County, IA, Carroll County, IA, Cherokee County, IA, Clay County, IA, Crawford County, IA, Dickinson County, IA, Emmet County, IA, Humboldt County, IA, Ida County, IA, Kossuth County, IA, O'Brien County, IA, Osceola County, IA, Palo Alto County, IA, Pocahontas County, IA, Sac County, IA, Brown County, MN, Chippewa County, MN, Cottonwood County, MN, Douglas County, MN, Jackson County, MN, Kandiyohi County, MN, Martin County, MN, McLeod County, MN, Meeker County, MN, Murray County, MN, Nicollet County, MN, Nobles County, MN, Pope County, MN, Redwood County, MN, Renville County, MN, Sibley County, MN, Stearns County, MN, Swift County, MN, Watonwan County, MN

The radar

The Sioux Falls radar (KFSD), 133 km from the middle of the area, began a volume at 18:25 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 130May 29, 1:45 PM CDT

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 6.4 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-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: 138 J/kg
Mixed-layer CIN: -309 J/kg
Mixed-layer LCL: 1748 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 186 m²/s²
0-3 km storm-relative helicity: 221 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 29, 1:43 PM CDT	Severe Thunderstorm Watch	SPC	Adair, Audubon, Boone, Buena Vista, Calhoun, Carroll and 26 more	6 hr
May 29, 2:01 PM CDT	Mesoscale Discussion	SPC	Fremont, Mills, Montgomery, Page	89 min
May 29, 2:40 PM CDT	Severe Thunderstorm Watch	SPC	Fremont, Mills, Montgomery, Page, Pottawattamie	7 hr
May 29, 3:54 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Audubon, Boone, Buena Vista, Butler and 47 more	96 min
May 29, 5:04 PM CDT	Mesoscale Discussion	SPC	Adams, Fremont, Mills, Montgomery, Page, Taylor	116 min
May 29, 5:34 PM CDT	Mesoscale Discussion	SPC	Aitkin, Anoka, Beltrami, Carlton, Cass, Chisago and 16 more	56 min

Nearby

Mesoscale Discussions in Minnesota, 2018 Mesoscale Discussions in Iowa, 2018 Every mesoscale discussion in 2018

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.