Alert archive / Indiana / Mesoscale Discussions in 2004

Mesoscale Discussion 852

May 23, 20044 states

The Storm Prediction Center issued this mesoscale discussion at May 23, 2004, 6:30 PM CDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: May 23, 2004, 6:30 PM CDT (23:30 UTC)
Expired: May 23, 2004, 8:30 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 65 counties

Cook County, IL, DuPage County, IL, Iroquois County, IL, Kankakee County, IL, Vermilion County, IL, Will County, IL, Allen County, IN, Benton County, IN, Carroll County, IN, Cass County, IN, DeKalb County, IN, Elkhart County, IN, Fulton County, IN, Huntington County, IN, Jasper County, IN, Kosciusko County, IN, LaGrange County, IN, Lake County, IN, LaPorte County, IN, Marshall County, IN, Miami County, IN, Newton County, IN, Noble County, IN, Porter County, IN, Pulaski County, IN, Saint Joseph County, IN, Starke County, IN, Steuben County, IN, Tippecanoe County, IN, Wabash County, IN, Warren County, IN, White County, IN, Whitley County, IN, Allegan County, MI, Barry County, MI, Berrien County, MI, Branch County, MI, Calhoun County, MI, Cass County, MI, Eaton County, MI, Genesee County, MI, Hillsdale County, MI, Ingham 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, Shiawassee County, MI, Van Buren County, MI, Washtenaw County, MI, Wayne County, MI, Defiance County, OH, Fulton County, OH, Henry County, OH, Lucas County, OH, Ottawa County, OH, Paulding County, OH, Williams County, OH, Wood County, OH

The radar

The Northern Indiana radar (KIWX), 48 km from the middle of the area, began a volume at 23:32 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 269May 23, 9:50 PM CDT

The nearest sounding before it

Detroit, MI (KDTX), launched 12:00Z, 11.5 hours before the alert went out and 231 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: 123 J/kg
Mixed-layer CIN: -175 J/kg
Mixed-layer LCL: 589 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 159 m²/s²
0-3 km storm-relative helicity: 224 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.3

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 22, 8:58 PM CDT	Mesoscale Discussion	SPC	Boone, Bureau, Carroll, DeKalb, DuPage, Grundy and 23 more	92 min
May 23, 12:24 AM CDT	Mesoscale Discussion	SPC	Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 32 more	66 min
May 23, 12:40 AM CDT	Severe Thunderstorm Watch	SPC	Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 27 more	5 hr
May 23, 1:21 AM CDT	Mesoscale Discussion	SPC	Adams, Brown, Calhoun, Cass, Greene, Jersey and 6 more	24 min
May 23, 1:40 AM CDT	Severe Thunderstorm Watch	SPC	Adams, Brown, Cass, Fulton, Hancock, Logan and 8 more	4 hr
May 23, 4:30 AM CDT	Mesoscale Discussion	SPC	Adams, Boone, Brown, Bureau, Carroll, Cass and 44 more	60 min
May 23, 10:45 AM CDT	Tornado Watch	SPC	Clark, Clay, Coles, Crawford, Cumberland, Edgar and 19 more	5 hr
May 23, 12:25 PM CDT	Mesoscale Discussion	SPC	Adams, Brown, Bureau, Calhoun, Carroll, Cass and 31 more	95 min
May 23, 12:45 PM CDT	Mesoscale Discussion	SPC	Clark, Clay, Coles, Crawford, Cumberland, Edgar and 18 more	2 hr
May 23, 1:15 PM CDT	Tornado Watch	SPC	Adams, Brown, Calhoun, Cass, Fulton, Greene and 16 more	6 hr
May 23, 2:05 PM CDT	Tornado Watch	SPC	Boone, Bureau, Carroll, DeKalb, DuPage, Grundy and 18 more	8 hr
May 23, 2:53 PM CDT	Mesoscale Discussion	SPC	Iroquois, Vermilion	67 min
May 23, 3:50 PM CDT	Tornado Watch	SPC	Cook, DuPage, Iroquois, Kankakee, Vermilion, Will	6 hr
May 23, 4:35 PM CDT	Severe Thunderstorm Watch	SPC	Monroe	5 hr
May 23, 5:00 PM CDT	Mesoscale Discussion	SPC	Adams, Bond, Brown, Calhoun, Cass, Christian and 28 more	2 hr
May 23, 5:10 PM CDT	Mesoscale Discussion	SPC	Boone, Bureau, Carroll, DeKalb, DuPage, Grundy and 17 more	95 min
May 23, 5:30 PM CDT	Tornado Watch	SPC	Bond, Calhoun, Christian, Clark, Clay, Clinton and 29 more	6 hr
May 23, 9:45 AM CDT	Mesoscale Discussion	SPC	Adams, Allen, Benton, Blackford, Boone, Carroll and 37 more	2 hr
May 23, 10:10 AM CDT	Tornado Watch	SPC	Adams, Allen, Blackford, Carroll, Cass, Clinton and 21 more	6 hr
May 23, 12:35 PM CDT	Mesoscale Discussion	SPC	Adams, Allen, Blackford, Carroll, Cass, Clinton and 19 more	115 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.