Alert archive / Minnesota / Mesoscale Discussions in 2008

Mesoscale Discussion 1972

July 31, 200823 counties in Minnesota; 13 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 31, 2008, 5:28 AM CDT for 23 counties in Minnesota; 13 counties in South Dakota. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued: Jul 31, 2008, 5:28 AM CDT (10:28 UTC)
Expired: Jul 31, 2008, 7:00 AM CDT
In force: 92 min
Issued by: the Storm Prediction Center

All 36 counties

Big Stone County, MN, Blue Earth County, MN, Brown County, MN, Chippewa County, MN, Cottonwood County, MN, Faribault County, MN, Kandiyohi County, MN, Lac qui Parle County, MN, Le Sueur County, MN, Lincoln County, MN, Lyon County, MN, McLeod County, MN, Meeker County, MN, Nicollet County, MN, Pope County, MN, Redwood County, MN, Renville County, MN, Sibley County, MN, Stevens County, MN, Swift County, MN, Traverse County, MN, Watonwan County, MN, Yellow Medicine County, MN, Brookings County, SD, Brown County, SD, Clark County, SD, Codington County, SD, Day County, SD, Deuel County, SD, Edmunds County, SD, Faulk County, SD, Grant County, SD, Hamlin County, SD, Marshall County, SD, Roberts County, SD, Spink County, SD

The radar

The Aberdeen radar (KABR), 124 km from the middle of the area, began a volume at 10:28 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.

Severe Thunderstorm Watch 781Jul 31, 7:20 AM CDT

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 10.5 hours before the alert went out and 114 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: 1719 J/kg
Mixed-layer CIN: -151 J/kg
Mixed-layer LCL: 1514 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 64 m²/s²
0-3 km storm-relative helicity: 184 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 10.9

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
Jul 31, 12:50 AM CDT	Mesoscale Discussion	SPC	Big Stone, Chippewa, Lac qui Parle, Lincoln, Lyon, Murray and 9 more	85 min
Jul 31, 1:23 AM CDT	Severe Thunderstorm Watch	SPC	Big Stone, Traverse	5 hr
Jul 31, 3:30 AM CDT	Mesoscale Discussion	SPC	Big Stone, Lac qui Parle, Lincoln, Pipestone, Rock, Yellow Medicine	90 min
Jul 31, 4:51 AM CDT	Severe Thunderstorm Watch	SPC	Anoka, Blue Earth, Brown, Carver, Chippewa, Cottonwood and 30 more	4 hr
Jul 31, 6:50 AM CDT	Mesoscale Discussion	SPC	Blue Earth, Brown, Carver, Chippewa, Cottonwood, Dakota and 35 more	85 min
Jul 31, 7:18 AM CDT	Severe Thunderstorm Watch	SPC	Cottonwood, Dodge, Fillmore, Houston, Jackson, Mower and 6 more	6 hr
Jul 31, 8:03 AM CDT	Mesoscale Discussion	SPC	Blue Earth, Brown, Carver, Cottonwood, Dakota, Dodge and 26 more	87 min
Jul 31, 10:28 AM CDT	Mesoscale Discussion	SPC	Blue Earth, Brown, Carver, Cottonwood, Dakota, Dodge and 26 more	92 min
Jul 30, 7:04 PM CDT	Mesoscale Discussion	SPC	Campbell, Corson, Dewey, Edmunds, Hughes, Hyde and 5 more	56 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.