Alert archive / Illinois / Mesoscale Discussions in 2003

Mesoscale Discussion 1533

June 28, 200319 counties in Illinois; 15 counties in Indiana

The Storm Prediction Center issued this mesoscale discussion at Jun 28, 2003, 1:36 PM CDT for 19 counties in Illinois; 15 counties in Indiana. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jun 28, 2003, 1:36 PM CDT (18:36 UTC)
Expired: Jun 28, 2003, 4:00 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 34 counties

Bureau County, IL, Ford County, IL, Grundy County, IL, Henry County, IL, Iroquois County, IL, Kankakee County, IL, Kendall County, IL, Knox County, IL, LaSalle County, IL, Livingston County, IL, Marshall County, IL, Mercer County, IL, Peoria County, IL, Putnam County, IL, Rock Island County, IL, Stark County, IL, Whiteside County, IL, Will County, IL, Woodford County, IL, Elkhart County, IN, Fulton County, IN, Jasper County, IN, Kosciusko County, IN, LaGrange County, IN, Lake County, IN, LaPorte County, IN, Marshall County, IN, Newton County, IN, Noble County, IN, Porter County, IN, Pulaski County, IN, Saint Joseph County, IN, Starke County, IN, White County, IN

The radar

The Chicago radar (KLOT), 40 km from the middle of the area, began a volume at 18:36 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, 6.6 hours before the alert went out and 130 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: 169 J/kg
Mixed-layer CIN: -109 J/kg
Mixed-layer LCL: 1419 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: -54 m²/s²
0-3 km storm-relative helicity: 59 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
Jun 28, 2:58 PM CDT	Mesoscale Discussion	SPC	Carroll, Jo Daviess, Stephenson, Winnebago	2 hr
Jun 28, 11:19 AM CDT	Mesoscale Discussion	SPC	Elkhart, LaGrange, Saint Joseph, Steuben	2 hr

Nearby

Mesoscale Discussions in Illinois, 2003 Mesoscale Discussions in Indiana, 2003 Every mesoscale discussion in 2003

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.