Alert archive / Minnesota / Mesoscale Discussions in 2007

Mesoscale Discussion 401

March 31, 200719 counties in Minnesota; Minnehaha County, Moody County, South Dakota

The Storm Prediction Center issued this mesoscale discussion at Mar 31, 2007, 4:44 PM CDT for 19 counties in Minnesota; Minnehaha County, Moody County, South Dakota. It was in force for 91 min.

The area

The outline as issued.

The facts

Issued: Mar 31, 2007, 4:44 PM CDT (21:44 UTC)
Expired: Mar 31, 2007, 6:15 PM CDT
In force: 91 min
Issued by: the Storm Prediction Center

All 21 counties

Blue Earth County, MN, Brown County, MN, Cottonwood County, MN, Dodge County, MN, Faribault County, MN, Fillmore County, MN, Freeborn County, MN, Jackson County, MN, Martin County, MN, Mower County, MN, Murray County, MN, Nicollet County, MN, Nobles County, MN, Olmsted County, MN, Pipestone County, MN, Rock County, MN, Steele County, MN, Waseca County, MN, Watonwan County, MN, Minnehaha County, SD, Moody County, SD

The radar

The Minneapolis radar (KMPX), 146 km from the middle of the area, began a volume at 21:48 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, 9.7 hours before the alert went out and 145 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: 475 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 130 m²/s²
0-3 km storm-relative helicity: 155 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
Mar 31, 11:38 AM CDT	Tornado Watch	SPC	Clay, Union	7 hr

Nearby

Mesoscale Discussions in Minnesota, 2007 Mesoscale Discussions in South Dakota, 2007 Every mesoscale discussion in 2007

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.