Alert archive / Minnesota / Mesoscale Discussions in 2008

Mesoscale Discussion 763

May 1, 200819 counties in Minnesota; Deuel County, Grant County, Roberts County, South Dakota

The Storm Prediction Center issued this mesoscale discussion at May 1, 2008, 8:28 PM CDT for 19 counties in Minnesota; Deuel County, Grant County, Roberts County, South Dakota. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued: May 1, 2008, 8:28 PM CDT (01:28 UTC)
Expired: May 1, 2008, 10:00 PM CDT
In force: 92 min
Issued by: the Storm Prediction Center

All 22 counties

Big Stone County, MN, Blue Earth County, MN, Brown County, MN, Carver County, MN, Chippewa County, MN, Dakota County, MN, Kandiyohi County, MN, Lac qui Parle County, MN, Le Sueur County, MN, McLeod County, MN, Meeker County, MN, Nicollet County, MN, Renville County, MN, Rice County, MN, Scott County, MN, Sibley County, MN, Swift County, MN, Waseca County, MN, Yellow Medicine County, MN, Deuel County, SD, Grant County, SD, Roberts County, SD

The radar

The Sioux Falls radar (KFSD), 162 km from the middle of the area, began a volume at 01:29 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 00:00Z, 1.5 hours before the alert went out and 204 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: 1220 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 270 m²/s²
0-3 km storm-relative helicity: 338 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
May 1, 7:47 PM CDT	Mesoscale Discussion	SPC	Cottonwood, Jackson, Lincoln, Martin, Murray, Nobles and 2 more	88 min
May 2, 11:05 AM CDT	Mesoscale Discussion	SPC	Fillmore, Houston, Mower	115 min
May 2, 3:47 PM CDT	Mesoscale Discussion	SPC	Fillmore, Houston	118 min

Nearby

Mesoscale Discussions in Minnesota, 2008 Mesoscale Discussions in South Dakota, 2008 Every mesoscale discussion in 2008

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.