Alert archive / Indiana / Mesoscale Discussions in 2004

Mesoscale Discussion 1211

June 12, 200413 counties in Illinois; 19 counties in Indiana; Berrien County, Michigan

The Storm Prediction Center issued this mesoscale discussion at Jun 12, 2004, 3:08 AM CDT for 13 counties in Illinois; 19 counties in Indiana; Berrien County, Michigan. It was in force for 97 min.

The area

The outline as issued.

The facts

Issued
Jun 12, 2004, 3:08 AM CDT (08:08 UTC)
Expired
Jun 12, 2004, 4:45 AM CDT
In force
97 min
Issued by
the Storm Prediction Center
All 33 counties

Cook County, IL, DeKalb County, IL, DuPage County, IL, Grundy County, IL, Iroquois County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Lake County, IL, LaSalle County, IL, Livingston County, IL, McHenry County, IL, Will County, IL, Benton County, IN, Carroll County, IN, Cass County, IN, Clinton County, IN, Fulton County, IN, Howard County, IN, Jasper 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, Warren County, IN, White County, IN, Berrien County, MI

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 8.1 hours before the alert went out and 163 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-pSkew-T log-p diagram, Lincoln, IL at 00:00Z on 2004-06-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3388 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 00:00Z on 2004-06-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 39 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
3388 J/kg
Mixed-layer CIN
-4 J/kg
Mixed-layer LCL
1075 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
39 m²/s²
0-3 km storm-relative helicity
58 m²/s²
Significant tornado parameter
0.4
Supercell composite
2.4

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.

IssuedProductOfficeCountiesLasted
Jun 11, 9:35 PM CDTSevere Thunderstorm WatchSPCHenderson, Mercer4 hr
Jun 11, 10:04 PM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, DeKalb, Grundy, Jo Daviess and 10 more56 min
Jun 11, 11:00 PM CDTTornado WatchSPCBureau, Carroll, DeKalb, DuPage, Ford, Grundy and 15 more5 hr
Jun 12, 1:48 AM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, Cook, DeKalb, DuPage and 19 more87 min
Jun 12, 10:48 AM CDTMesoscale DiscussionSPCGallatin, Hardin, Massac, Pope2 hr
Jun 12, 3:45 PM CDTSevere Thunderstorm WatchSPCHenderson, Mercer, Rock Island, Warren5 hr
Jun 12, 3:51 PM CDTMesoscale DiscussionSPCAlexander, Franklin, Gallatin, Hamilton, Hardin, Jackson and 11 more84 min
Jun 12, 4:15 PM CDTSevere Thunderstorm WatchSPCAlexander, Gallatin, Hardin, Jackson, Johnson, Massac and 5 more5 hr
Jun 12, 6:08 PM CDTMesoscale DiscussionSPCAlexander, Gallatin, Hardin, Jackson, Johnson, Massac and 5 more37 min
Jun 12, 11:10 AM CDTSevere Thunderstorm WatchSPCClark, Crawford, Floyd, Harrison, Orange, Perry and 2 more5 hr

Nearby

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