Alert archive / Illinois / Mesoscale Discussions in 2004

Mesoscale Discussion 1224

June 12, 200417 counties in Illinois; 4 counties in Kentucky; 6 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Jun 12, 2004, 3:51 PM CDT for 17 counties in Illinois; 4 counties in Kentucky; 6 counties in Missouri. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued
Jun 12, 2004, 3:51 PM CDT (20:51 UTC)
Expired
Jun 12, 2004, 5:15 PM CDT
In force
84 min
Issued by
the Storm Prediction Center
All 27 counties

Alexander County, IL, Franklin County, IL, Gallatin County, IL, Hamilton County, IL, Hardin County, IL, Jackson County, IL, Jefferson County, IL, Johnson County, IL, Massac County, IL, Perry County, IL, Pope County, IL, Pulaski County, IL, Randolph County, IL, Saline County, IL, Union County, IL, White County, IL, Williamson County, IL, Ballard County, KY, Carlisle County, KY, Livingston County, KY, McCracken County, KY, Bollinger County, MO, Cape Girardeau County, MO, Mississippi County, MO, Perry County, MO, Sainte Genevieve County, MO, Scott County, MO

The radar

The Paducah radar (KPAH), 63 km from the middle of the area, began a volume at 20:52 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 8.9 hours before the alert went out and 273 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, Nashville Metro, TN at 12:00Z on 2004-06-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1896 joules per kilogram.LCLLFCEL10008507005003002001001 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, Nashville Metro, TN at 12:00Z on 2004-06-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 91 square meters per square second.1939Sfc1 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
1896 J/kg
Mixed-layer CIN
-27 J/kg
Mixed-layer LCL
911 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
91 m²/s²
0-3 km storm-relative helicity
73 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.

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, 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, 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 WatchSPCAdair, Allen, Anderson, Barren, Bath, Bell and 77 more5 hr
Jun 12, 1:35 PM CDTSevere Thunderstorm WatchSPCFulton5 hr
Jun 12, 1:54 PM CDTMesoscale DiscussionSPCAdair, Allen, Anderson, Barren, Bath, Bell and 68 more2 hr
Jun 12, 3:14 PM CDTMesoscale DiscussionSPCFulton2 hr
Jun 12, 3:30 PM CDTMesoscale DiscussionSPCAdair, Allen, Barren, Bath, Bell, Bourbon and 48 more90 min
Jun 11, 11:34 PM CDTMesoscale DiscussionSPCBuchanan, Caldwell, Carroll, Clay, Clinton, Daviess and 5 more116 min
Jun 12, 2:18 AM CDTMesoscale DiscussionSPCBarton, Bates, Benton, Camden, Cass, Cedar and 18 more87 min
Jun 12, 10:30 AM CDTMesoscale DiscussionSPCAtchison, Barton, Bates, Benton, Camden, Cass and 29 more2 hr
Jun 12, 11:38 AM CDTMesoscale DiscussionSPCBarry, Butler, Carter, Dunklin, Howell, McDonald and 9 more2 hr
Jun 12, 11:45 AM CDTTornado WatchSPCAndrew, Atchison, Buchanan, Gentry, Holt, Nodaway and 1 more7 hr
Jun 12, 12:43 PM CDTMesoscale DiscussionSPCAtchison92 min
Jun 12, 3:10 PM CDTSevere Thunderstorm WatchSPCBarry, Barton, Christian, Dade, Douglas, Greene and 9 more6 hr
Jun 12, 4:36 PM CDTMesoscale DiscussionSPCBarry, Barton, Bates, Caldwell, Carroll, Cass and 24 more84 min
Jun 12, 5:00 PM CDTMesoscale DiscussionSPCAndrew, Atchison, Buchanan, Gentry, Holt, Nodaway and 1 more90 min
Jun 12, 6:15 PM CDTTornado WatchSPCAdair, Andrew, Atchison, Bates, Benton, Buchanan and 31 more5 hr

Nearby

Mesoscale Discussions in Illinois, 2004Mesoscale Discussions in Missouri, 2004Mesoscale Discussions in Kentucky, 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.