Alert archive / Minnesota / Mesoscale Discussions in 2004

Mesoscale Discussion 1640

July 13, 200426 counties in Minnesota; 5 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Jul 13, 2004, 3:35 AM CDT for 26 counties in Minnesota; 5 counties in Wisconsin. It was in force for 55 min.

The area

The outline as issued.

The facts

Issued: Jul 13, 2004, 3:35 AM CDT (08:35 UTC)
Expired: Jul 13, 2004, 4:30 AM CDT
In force: 55 min
Issued by: the Storm Prediction Center

All 31 counties

Anoka County, MN, Benton County, MN, Carver County, MN, Chippewa County, MN, Chisago County, MN, Hennepin County, MN, Isanti County, MN, Kanabec County, MN, Kandiyohi County, MN, McLeod County, MN, Meeker County, MN, Mille Lacs County, MN, Morrison County, MN, Nicollet County, MN, Pine County, MN, Pope County, MN, Ramsey County, MN, Renville County, MN, Scott County, MN, Sherburne County, MN, Sibley County, MN, Stearns County, MN, Swift County, MN, Todd County, MN, Washington County, MN, Wright County, MN, Barron County, WI, Burnett County, WI, Polk County, WI, Saint Croix County, WI, Washburn County, WI

The radar

The Minneapolis radar (KMPX), 62 km from the middle of the area, began a volume at 08:36 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 00:00Z, 8.6 hours before the alert went out and 60 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: 1267 J/kg
Mixed-layer CIN: -73 J/kg
Mixed-layer LCL: 1215 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 47 m²/s²
0-3 km storm-relative helicity: 174 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 2.1

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 12, 9:19 PM CDT	Mesoscale Discussion	SPC	Aitkin, Anoka, Becker, Beltrami, Benton, Big Stone and 52 more	116 min
Jul 12, 9:50 PM CDT	Severe Thunderstorm Watch	SPC	Becker, Big Stone, Blue Earth, Brown, Chippewa, Clay and 38 more	6 hr
Jul 12, 11:52 PM CDT	Mesoscale Discussion	SPC	Jackson, Nobles, Rock	53 min
Jul 13, 1:20 AM CDT	Severe Thunderstorm Watch	SPC	Aitkin, Benton, Carlton, Cass, Chisago, Crow Wing and 6 more	6 hr
Jul 13, 4:21 AM CDT	Mesoscale Discussion	SPC	Fillmore, Freeborn, Mower, Olmsted	54 min
Jul 13, 10:08 AM CDT	Mesoscale Discussion	SPC	Brown, Door, Florence, Forest, Kewaunee, Langlade and 5 more	2 hr
Jul 13, 10:55 AM CDT	Severe Thunderstorm Watch	SPC	Brown, Door, Kewaunee, Manitowoc, Marinette, Menominee and 5 more	6 hr
Jul 13, 1:19 PM CDT	Mesoscale Discussion	SPC	Adams, Calumet, Columbia, Crawford, Dane, Dodge and 21 more	116 min
Jul 13, 2:10 PM CDT	Mesoscale Discussion	SPC	Brown, Door, Kewaunee, Manitowoc, Marinette, Menominee and 7 more	2 hr
Jul 13, 3:05 PM CDT	Severe Thunderstorm Watch	SPC	Brown, Calumet, Columbia, Dane, Dodge, Door and 18 more	8 hr

Nearby

Mesoscale Discussions in Minnesota, 2004 Mesoscale Discussions in Wisconsin, 2004 Every mesoscale discussion in 2004

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.