Alert archive / Illinois / Mesoscale Discussions in 2004

Mesoscale Discussion 1586

July 9, 200429 counties in Illinois; 18 counties in Indiana

The Storm Prediction Center issued this mesoscale discussion at Jul 9, 2004, 7:16 PM CDT for 29 counties in Illinois; 18 counties in Indiana. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jul 9, 2004, 7:16 PM CDT (00:16 UTC)
Expired: Jul 9, 2004, 9:45 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 47 counties

Cass County, IL, Champaign County, IL, Clark County, IL, Coles County, IL, DeWitt County, IL, Douglas County, IL, Edgar County, IL, Ford County, IL, Fulton County, IL, Iroquois County, IL, Knox County, IL, Livingston County, IL, Logan County, IL, Macon County, IL, Marshall County, IL, Mason County, IL, McLean County, IL, Menard County, IL, Moultrie County, IL, Peoria County, IL, Piatt County, IL, Putnam County, IL, Sangamon County, IL, Schuyler County, IL, Stark County, IL, Tazewell County, IL, Vermilion County, IL, Warren County, IL, Woodford County, IL, Benton County, IN, Boone County, IN, Clay County, IN, Clinton County, IN, Fountain County, IN, Hamilton County, IN, Hendricks County, IN, Marion County, IN, Montgomery County, IN, Morgan County, IN, Owen County, IN, Parke County, IN, Putnam County, IN, Tippecanoe County, IN, Tipton County, IN, Vermillion County, IN, Vigo County, IN, Warren County, IN

The radar

The Lincoln radar (KILX), 37 km from the middle of the area, began a volume at 00:19 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 00:00Z, 0.3 hours before the alert went out and 31 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: 2969 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 1066 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 16 m²/s²
0-3 km storm-relative helicity: 3 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 10, 1:53 PM CDT	Mesoscale Discussion	SPC	Cass, Champaign, Christian, Clark, Coles, Crawford and 14 more	3 hr

Nearby

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