Alert archive / Indiana / Mesoscale Discussions in 2004

Mesoscale Discussion 1583

July 9, 20044 counties in Illinois; 24 counties in Indiana

The Storm Prediction Center issued this mesoscale discussion at Jul 9, 2004, 2:15 PM CDT for 4 counties in Illinois; 24 counties in Indiana. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jul 9, 2004, 2:15 PM CDT (19:15 UTC)
Expired: Jul 9, 2004, 4:15 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 28 counties

Grundy County, IL, Iroquois County, IL, Kankakee County, IL, Will County, IL, Benton County, IN, Carroll County, IN, Cass County, IN, Clinton County, IN, Fulton County, IN, Grant County, IN, Howard County, IN, Huntington County, IN, Jasper County, IN, Kosciusko County, IN, Lake County, IN, LaPorte County, IN, Marshall County, IN, Miami County, IN, Newton County, IN, Porter County, IN, Pulaski County, IN, Saint Joseph County, IN, Starke County, IN, Tippecanoe County, IN, Tipton County, IN, Wabash County, IN, White County, IN, Whitley County, IN

The radar

The Northern Indiana radar (KIWX), 110 km from the middle of the area, began a volume at 19:17 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, 7.3 hours before the alert went out and 170 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: 2498 J/kg
Mixed-layer CIN: -48 J/kg
Mixed-layer LCL: 523 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 93 m²/s²
0-3 km storm-relative helicity: 115 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 9, 4:26 PM CDT	Mesoscale Discussion	SPC	Fulton, Hancock, Henderson, Knox, Logan, McDonough and 10 more	94 min

Nearby

Mesoscale Discussions in Indiana, 2004 Mesoscale Discussions in Illinois, 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.