Alert archive / Indiana / Mesoscale Discussions in 2004

Mesoscale Discussion 1209

June 12, 20044 states

The Storm Prediction Center issued this mesoscale discussion at Jun 12, 2004, 1:48 AM CDT for 4 states. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued
Jun 12, 2004, 1:48 AM CDT (06:48 UTC)
Expired
Jun 12, 2004, 3:15 AM CDT
In force
87 min
Issued by
the Storm Prediction Center
All 72 counties

Boone County, IL, Bureau County, IL, Carroll County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Ford County, IL, Grundy County, IL, Henry County, IL, Iroquois County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Lake County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, Marshall County, IL, McHenry County, IL, Ogle County, IL, Putnam County, IL, Stephenson County, IL, Whiteside County, IL, Will County, IL, Winnebago County, IL, Adams County, IN, Allen County, IN, Benton County, IN, Blackford County, IN, Carroll County, IN, Cass County, IN, Clinton County, IN, DeKalb County, IN, Elkhart County, IN, Fulton County, IN, Grant County, IN, Howard County, IN, Huntington County, IN, Jasper County, IN, Jay 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, Tippecanoe County, IN, Tipton County, IN, Wabash County, IN, Warren County, IN, Wells County, IN, White County, IN, Whitley County, IN, Allegan County, MI, Berrien County, MI, Branch County, MI, Cass County, MI, Kalamazoo County, MI, Saint Joseph County, MI, Van Buren County, MI, Green County, WI, Kenosha County, WI, Racine County, WI, Rock County, WI, Walworth County, WI

The radar

The Chicago radar (KLOT), 40 km from the middle of the area, began a volume at 06:48 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, 6.8 hours before the alert went out and 190 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, 3:08 AM CDTMesoscale DiscussionSPCCook, DeKalb, DuPage, Grundy, Iroquois, Kane and 7 more97 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
Jun 11, 7:57 PM CDTMesoscale DiscussionSPCAdams, Barron, Buffalo, Chippewa, Clark, Crawford and 18 more93 min

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; radar from the NEXRAD Level II archive.