Alert archive / Minnesota / Mesoscale Discussions in 2017

Mesoscale Discussion 725

May 15, 20179 counties in Iowa; 25 counties in Minnesota

The Storm Prediction Center issued this mesoscale discussion at May 15, 2017, 8:50 PM CDT for 9 counties in Iowa; 25 counties in Minnesota. It was in force for 115 min.

The area

The outline as issued.

The facts

Issued: May 15, 2017, 8:50 PM CDT (01:50 UTC)
Expired: May 15, 2017, 10:45 PM CDT
In force: 115 min
Issued by: the Storm Prediction Center
Chance of a watch: 60%

All 34 counties

Clay County, IA, Dickinson County, IA, Emmet County, IA, Kossuth County, IA, Mitchell County, IA, Osceola County, IA, Palo Alto County, IA, Winnebago County, IA, Worth County, IA, Blue Earth County, MN, Brown County, MN, Cottonwood County, MN, Dakota County, MN, Dodge County, MN, Faribault County, MN, Fillmore County, MN, Freeborn County, MN, Goodhue County, MN, Jackson County, MN, Le Sueur County, MN, Martin County, MN, Mower County, MN, Murray County, MN, Nicollet County, MN, Nobles County, MN, Olmsted County, MN, Rice County, MN, Scott County, MN, Sibley County, MN, Steele County, MN, Wabasha County, MN, Waseca County, MN, Watonwan County, MN, Winona County, MN

The radar

The Minneapolis radar (KMPX), 125 km from the middle of the area, began a volume at 01:51 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 00:00Z, 1.8 hours before the alert went out and 124 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: 1282 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 21 m²/s²
0-3 km storm-relative helicity: 111 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 15, 7:19 PM CDT	Mesoscale Discussion	SPC	Allamakee, Black Hawk, Bremer, Buchanan, Butler, Cerro Gordo and 26 more	56 min
May 15, 9:48 PM CDT	Severe Thunderstorm Watch	SPC	Allamakee, Howard, Mitchell, Winneshiek	5 hr
May 15, 11:54 PM CDT	Severe Thunderstorm Watch	SPC	Cherokee, Clay, Dickinson, Lyon, O'Brien, Osceola and 3 more	3 hr
May 16, 2:13 AM CDT	Mesoscale Discussion	SPC	Buena Vista, Cherokee, Clay, Dickinson, Emmet, Hancock and 12 more	92 min
May 16, 3:58 PM CDT	Mesoscale Discussion	SPC	Adams, Audubon, Buena Vista, Calhoun, Carroll, Cass and 23 more	2 hr
May 16, 4:57 PM CDT	Severe Thunderstorm Watch	SPC	Adair, Adams, Audubon, Buena Vista, Calhoun, Carroll and 23 more	7 hr
May 16, 3:32 PM CDT	Mesoscale Discussion	SPC	Anoka, Blue Earth, Brown, Carver, Chisago, Dakota and 28 more	88 min
May 16, 4:08 PM CDT	Severe Thunderstorm Watch	SPC	Anoka, Blue Earth, Brown, Carver, Chisago, Dakota and 16 more	4 hr

Nearby

Mesoscale Discussions in Minnesota, 2017 Mesoscale Discussions in Iowa, 2017 Every mesoscale discussion in 2017

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.