Alert archive / Indiana / Mesoscale Discussions in 2005

Mesoscale Discussion 1809

July 21, 20054 states

The Storm Prediction Center issued this mesoscale discussion at Jul 21, 2005, 10:27 AM CDT for 4 states. It was in force for 33 min.

The area

The outline as issued.

The facts

Issued: Jul 21, 2005, 10:27 AM CDT (15:27 UTC)
Expired: Jul 21, 2005, 11:00 AM CDT
In force: 33 min
Issued by: the Storm Prediction Center

All 53 counties

Cook County, IL, DuPage County, IL, Kankakee County, IL, Lake County, IL, Will County, IL, Adams County, IN, Allen 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, Wabash 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, Ionia County, MI, Kalamazoo County, MI, Kent County, MI, Ottawa County, MI, Saint Joseph County, MI, Van Buren County, MI, Dodge County, WI, Fond du Lac County, WI, Kenosha County, WI, Milwaukee County, WI, Ozaukee County, WI, Racine County, WI, Sheboygan County, WI, Washington County, WI, Waukesha County, WI

The radar

The Chicago radar (KLOT), 85 km from the middle of the area, began a volume at 15:30 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

Lincoln, IL (KILX), launched 12:00Z, 3.5 hours before the alert went out and 238 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: 1662 J/kg
Mixed-layer CIN: -126 J/kg
Mixed-layer LCL: 1219 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 58 m²/s²
0-3 km storm-relative helicity: 32 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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, 5:28 AM CDT	Mesoscale Discussion	SPC	Jo Daviess, Mercer, Rock Island	92 min
Jul 21, 6:27 AM CDT	Mesoscale Discussion	SPC	Boone, Bureau, Carroll, Cass, Champaign, DeKalb and 44 more	2 hr
Jul 21, 8:50 AM CDT	Severe Thunderstorm Watch	SPC	Boone, Cook, DeKalb, DuPage, Grundy, Kane and 9 more	4 hr
Jul 21, 3:15 PM CDT	Severe Thunderstorm Watch	SPC	Champaign, Christian, Coles, Douglas, Edgar, Ford and 5 more	6 hr
Jul 21, 5:33 PM CDT	Mesoscale Discussion	SPC	Champaign, Christian, Coles, Douglas, Edgar, Ford and 5 more	87 min
Jul 21, 4:05 AM CDT	Severe Thunderstorm Watch	SPC	Buffalo, Crawford, Grant, La Crosse, Pepin, Pierce and 2 more	5 hr

Nearby

Mesoscale Discussions in Indiana, 2005 Mesoscale Discussions in Michigan, 2005 Mesoscale Discussions in Wisconsin, 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.