Alert archive / Minnesota / Mesoscale Discussions in 2013

Mesoscale Discussion 681

May 18, 201314 counties in Minnesota; 6 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at May 18, 2013, 6:11 PM CDT for 14 counties in Minnesota; 6 counties in South Dakota. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued: May 18, 2013, 6:11 PM CDT (23:11 UTC)
Expired: May 18, 2013, 7:45 PM CDT
In force: 94 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

Counties Benton County, MN, Chippewa County, MN, Kandiyohi County, MN, Lac qui Parle County, MN, Lincoln County, MN, Lyon County, MN, McLeod County, MN, Meeker County, MN, Pope County, MN, Redwood County, MN, Renville County, MN, Stearns County, MN, Swift County, MN, Yellow Medicine County, MN, Brookings County, SD, Codington County, SD, Deuel County, SD, Grant County, SD, Hamlin County, SD, Kingsbury County, SD

The radar

The Sioux Falls radar (KFSD), 158 km from the middle of the area, began a volume at 23:12 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 nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 11.2 hours before the alert went out and 177 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: 120 J/kg
Mixed-layer CIN: -230 J/kg
Mixed-layer LCL: 921 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 89 m²/s²
0-3 km storm-relative helicity: 186 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 17, 7:28 PM CDT	Mesoscale Discussion	SPC	Bennett, Brule, Butte, Custer, Fall River, Gregory and 15 more	92 min
May 17, 7:59 PM CDT	Severe Thunderstorm Watch	SPC	Aurora, Brule, Buffalo, Charles Mix, Douglas, Faulk and 10 more	3 hr
May 17, 10:26 PM CDT	Mesoscale Discussion	SPC	Aurora, Bennett, Brule, Buffalo, Butte, Charles Mix and 23 more	64 min
May 18, 3:31 PM CDT	Mesoscale Discussion	SPC	Bennett, Brule, Buffalo, Butte, Custer, Dewey and 21 more	59 min
May 18, 3:55 PM CDT	Severe Thunderstorm Watch	SPC	Bennett, Butte, Custer, Fall River, Haakon, Harding and 9 more	8 hr
May 18, 5:24 PM CDT	Mesoscale Discussion	SPC	Brown, Campbell, Corson, Dewey, Edmunds, Faulk and 10 more	66 min
May 18, 5:46 PM CDT	Severe Thunderstorm Watch	SPC	Brown, Buffalo, Campbell, Corson, Dewey, Edmunds and 12 more	7 hr

Nearby

Mesoscale Discussions in Minnesota, 2013 Mesoscale Discussions in South Dakota, 2013 Every mesoscale discussion in 2013

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.