Alert archive / Indiana / Mesoscale Discussions in 2004

Mesoscale Discussion 1757

July 21, 200447 counties in Indiana; 21 counties in Michigan; 13 counties in Ohio

The Storm Prediction Center issued this mesoscale discussion at Jul 21, 2004, 7:49 PM EST for 47 counties in Indiana; 21 counties in Michigan; 13 counties in Ohio. It was in force for 56 min.

The area

The outline as issued.

The facts

Issued: Jul 21, 2004, 7:49 PM EST (00:49 UTC)
Expired: Jul 21, 2004, 8:45 PM EST
In force: 56 min
Issued by: the Storm Prediction Center

All 81 counties

Adams County, IN, Allen County, IN, Benton County, IN, Blackford County, IN, Boone County, IN, Carroll County, IN, Cass County, IN, Clay County, IN, Clinton County, IN, DeKalb County, IN, Delaware County, IN, Elkhart County, IN, Fountain County, IN, Fulton County, IN, Grant County, IN, Hamilton County, IN, Hendricks County, IN, Howard County, IN, Huntington County, IN, Jasper County, IN, Jay County, IN, Kosciusko County, IN, LaGrange County, IN, LaPorte County, IN, Madison County, IN, Marion County, IN, Marshall County, IN, Miami County, IN, Montgomery County, IN, Newton County, IN, Noble County, IN, Parke County, IN, Porter County, IN, Pulaski County, IN, Putnam County, IN, Saint Joseph County, IN, Starke County, IN, Steuben County, IN, Tippecanoe County, IN, Tipton County, IN, Vermillion County, IN, Vigo County, IN, Wabash County, IN, Warren County, IN, Wells County, IN, White County, IN, Whitley County, IN, Branch County, MI, Calhoun County, MI, Genesee County, MI, Hillsdale County, MI, Huron County, MI, Ingham County, MI, Iosco County, MI, Jackson County, MI, Kalamazoo County, MI, Lapeer County, MI, Lenawee County, MI, Livingston County, MI, Macomb County, MI, Monroe County, MI, Oakland County, MI, Saint Clair County, MI, Saint Joseph County, MI, Sanilac County, MI, Tuscola County, MI, Washtenaw County, MI, Wayne County, MI, Allen County, OH, Auglaize County, OH, Defiance County, OH, Fulton County, OH, Hancock County, OH, Henry County, OH, Lucas County, OH, Mercer County, OH, Paulding County, OH, Putnam County, OH, Van Wert County, OH, Williams County, OH, Wood County, OH

The radar

The Grand Rapids radar (KGRR), 101 km from the middle of the area, began a volume at 00:51 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

Detroit, MI (KDTX), launched 00:00Z, 0.8 hours before the alert went out and 140 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: 1124 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 1078 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 36 m²/s²
0-3 km storm-relative helicity: 76 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.8

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 21, 9:16 PM EST	Mesoscale Discussion	SPC	Adams, Bartholomew, Blackford, Brown, Clay, Dearborn and 21 more	59 min
Jul 22, 11:59 AM EST	Mesoscale Discussion	SPC	Adams, Allen, Benton, Blackford, Boone, Carroll and 34 more	2 hr
Jul 22, 12:20 PM EST	Severe Thunderstorm Watch	SPC	Benton, Clay, Fountain, Jasper, Lake, Montgomery and 9 more	6 hr
Jul 22, 1:52 PM EST	Mesoscale Discussion	SPC	Adams, Allen, Bartholomew, Benton, Blackford, Boone and 80 more	83 min
Jul 22, 3:05 PM EST	Severe Thunderstorm Watch	SPC	Adams, Allen, Bartholomew, Benton, Blackford, Boone and 78 more	6 hr
Jul 22, 3:45 PM EST	Severe Thunderstorm Watch	SPC	Spencer	5 hr
Jul 22, 6:42 PM EST	Mesoscale Discussion	SPC	Adams, Allen, Bartholomew, Blackford, Clark, Crawford and 38 more	93 min

Nearby

Mesoscale Discussions in Indiana, 2004 Mesoscale Discussions in Michigan, 2004 Mesoscale Discussions in Ohio, 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.