Alert archive / Minnesota / Mesoscale Discussions in 2012

Mesoscale Discussion 553

April 15, 20129 counties in Minnesota; 4 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Apr 15, 2012, 5:54 PM CDT for 9 counties in Minnesota; 4 counties in Wisconsin. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued: Apr 15, 2012, 5:54 PM CDT (22:54 UTC)
Expired: Apr 15, 2012, 7:30 PM CDT
In force: 96 min
Issued by: the Storm Prediction Center

Counties Anoka County, MN, Carver County, MN, Chisago County, MN, Dakota County, MN, Hennepin County, MN, Ramsey County, MN, Scott County, MN, Washington County, MN, Wright County, MN, Dunn County, WI, Pierce County, WI, Polk County, WI, Saint Croix County, WI

The radar

The Minneapolis radar (KMPX), 49 km from the middle of the area, began a volume at 22:56 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

Minneapolis, MN (KMPX), launched 12:00Z, 10.9 hours before the alert went out and 51 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: 502 m above ground
0-6 km bulk shear: 79 kt
0-1 km storm-relative helicity: 125 m²/s²
0-3 km storm-relative helicity: 222 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
Apr 14, 7:51 PM CDT	Mesoscale Discussion	SPC	Nobles, Pipestone, Rock	84 min
Apr 15, 12:25 PM CDT	Mesoscale Discussion	SPC	Benton, Big Stone, Chippewa, Douglas, Kandiyohi, Lac qui Parle and 13 more	65 min
Apr 15, 1:56 PM CDT	Mesoscale Discussion	SPC	Blue Earth, Brown, Carver, Cottonwood, Dakota, Dodge and 18 more	94 min
Apr 15, 3:37 PM CDT	Tornado Watch	SPC	Anoka, Blue Earth, Brown, Carver, Chippewa, Chisago and 37 more	7 hr
Apr 14, 9:54 PM CDT	Mesoscale Discussion	SPC	Green, Kenosha, Rock, Walworth	96 min

Nearby

Mesoscale Discussions in Minnesota, 2012 Mesoscale Discussions in Wisconsin, 2012 Every mesoscale discussion in 2012

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.