Alert archive / Indiana / Mesoscale Discussions in 2005

Mesoscale Discussion 1798

July 20, 20054 states

The Storm Prediction Center issued this mesoscale discussion at Jul 20, 2005, 3:12 PM CDT for 4 states. It was in force for 93 min.

The area

The outline as issued.

The facts

Issued: Jul 20, 2005, 3:12 PM CDT (20:12 UTC)
Expired: Jul 20, 2005, 4:45 PM CDT
In force: 93 min
Issued by: the Storm Prediction Center

All 60 counties

Champaign County, IL, Ford County, IL, Iroquois County, IL, Vermilion County, IL, Allen County, IN, Benton County, IN, Blackford County, IN, Boone County, IN, Carroll County, IN, Cass County, IN, Clinton County, IN, DeKalb 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, Kosciusko County, IN, LaGrange County, IN, LaPorte 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, Wabash County, IN, Warren County, IN, Wells 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, Hillsdale County, MI, Ingham County, MI, Jackson County, MI, Kalamazoo County, MI, Lenawee County, MI, Saint Joseph County, MI, Van Buren County, MI, Washtenaw County, MI, Williams County, OH

The radar

The Northern Indiana radar (KIWX), 64 km from the middle of the area, began a volume at 20:13 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 12:00Z, 8.2 hours before the alert went out and 302 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: 2047 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: -23 m²/s²
0-3 km storm-relative helicity: 47 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
Jul 20, 11:30 AM CDT	Severe Thunderstorm Watch	SPC	Bureau, Cass, Champaign, Christian, Cook, DeKalb and 31 more	7 hr
Jul 20, 11:32 AM CDT	Mesoscale Discussion	SPC	Boone, Bureau, Champaign, Cook, DeKalb, DeWitt and 34 more	58 min
Jul 20, 5:44 PM CDT	Mesoscale Discussion	SPC	Champaign, Christian, DeWitt, Ford, Iroquois, Kankakee and 9 more	61 min

Nearby

Mesoscale Discussions in Indiana, 2005 Mesoscale Discussions in Michigan, 2005 Mesoscale Discussions in Illinois, 2005 Every mesoscale discussion in 2005

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.