Alert archive / Illinois / Mesoscale Discussions in 2004

Mesoscale Discussion 1542

July 6, 20046 states

The Storm Prediction Center issued this mesoscale discussion at Jul 6, 2004, 11:01 AM CDT for 6 states. It was in force for 59 min.

The area

The outline as issued.

The facts

Issued
Jul 6, 2004, 11:01 AM CDT (16:01 UTC)
Expired
Jul 6, 2004, 12:00 PM CDT
In force
59 min
Issued by
the Storm Prediction Center
All 99 counties

Clay County, AR, Fulton County, AR, Randolph County, AR, Sharp County, AR, Alexander County, IL, Bond County, IL, Clay County, IL, Clinton County, IL, Crawford County, IL, Cumberland County, IL, Edwards County, IL, Effingham County, IL, Fayette County, IL, Franklin County, IL, Gallatin County, IL, Hamilton County, IL, Hardin County, IL, Jackson County, IL, Jasper County, IL, Jefferson County, IL, Johnson County, IL, Lawrence County, IL, Madison County, IL, Marion County, IL, Massac County, IL, Monroe County, IL, Perry County, IL, Pope County, IL, Pulaski County, IL, Randolph County, IL, Richland County, IL, Saint Clair County, IL, Saline County, IL, Union County, IL, Wabash County, IL, Washington County, IL, Wayne County, IL, White County, IL, Williamson County, IL, Daviess County, IN, Dubois County, IN, Gibson County, IN, Knox County, IN, Pike County, IN, Posey County, IN, Spencer County, IN, Vanderburgh County, IN, Warrick County, IN, Ballard County, KY, Caldwell County, KY, Calloway County, KY, Carlisle County, KY, Christian County, KY, Crittenden County, KY, Daviess County, KY, Fulton County, KY, Graves County, KY, Henderson County, KY, Hickman County, KY, Hopkins County, KY, Livingston County, KY, Logan County, KY, Lyon County, KY, Marshall County, KY, McCracken County, KY, McLean County, KY, Muhlenberg County, KY, Ohio County, KY, Todd County, KY, Trigg County, KY, Union County, KY, Webster County, KY, Bollinger County, MO, Butler County, MO, Cape Girardeau County, MO, Carter County, MO, City of Saint Louis, MO, Dent County, MO, Howell County, MO, Iron County, MO, Jefferson County, MO, Madison County, MO, Mississippi County, MO, New Madrid County, MO, Oregon County, MO, Ozark County, MO, Perry County, MO, Reynolds County, MO, Ripley County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Scott County, MO, Shannon County, MO, Stoddard County, MO, Washington County, MO, Wayne County, MO, Lake County, TN, Obion County, TN

The radar

The Paducah radar (KPAH), 105 km from the middle of the area, began a volume at 16:03 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

Little Rock, AR (KLZK), launched 12:00Z, 4.0 hours before the alert went out and 283 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, Little Rock, AR at 12:00Z on 2004-07-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 449 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, Little Rock, AR at 12:00Z on 2004-07-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -67 square meters per square second.193958Sfc1 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
449 J/kg
Mixed-layer CIN
-170 J/kg
Mixed-layer LCL
911 m above ground
0-6 km bulk shear
13 kt
0-1 km storm-relative helicity
-67 m²/s²
0-3 km storm-relative helicity
-30 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
Jul 6, 3:50 AM CDTSevere Thunderstorm WatchSPCBenton, Carroll, Crawford, Madison, Sebastian, Washington5 hr
Jul 6, 5:18 AM CDTMesoscale DiscussionSPCBenton, Carroll, Crawford, Madison, Washington117 min
Jul 6, 12:10 PM CDTSevere Thunderstorm WatchSPCClay, Cleburne, Craighead, Crittenden, Cross, Faulkner and 15 more6 hr
Jul 6, 2:34 PM CDTMesoscale DiscussionSPCClay, Mississippi56 min
Jul 6, 5:37 PM CDTMesoscale DiscussionSPCClay, Craighead, Fulton, Greene, Lawrence, Randolph and 1 more53 min
Jul 5, 7:05 PM CDTMesoscale DiscussionSPCBond, Calhoun, Greene, Jersey, Macoupin, Madison and 2 more55 min
Jul 5, 9:10 PM CDTSevere Thunderstorm WatchSPCBond, Christian, Clark, Clay, Clinton, Coles and 18 more4 hr
Jul 5, 9:29 PM CDTMesoscale DiscussionSPCBureau, Carroll, Henderson, Henry, Jo Daviess, Lee and 8 more61 min
Jul 5, 11:14 PM CDTMesoscale DiscussionSPCChampaign, DeWitt, Douglas, Edgar, Ford, Iroquois and 13 more91 min
Jul 5, 11:44 PM CDTMesoscale DiscussionSPCBond, Calhoun, Clark, Clay, Clinton, Coles and 26 more91 min
Jul 6, 6:50 AM CDTSevere Thunderstorm WatchSPCAdams, Bond, Brown, Calhoun, Cass, Christian and 19 more4 hr
Jul 6, 9:00 AM CDTMesoscale DiscussionSPCAdams, Brown, Calhoun, Cass, Champaign, Christian and 28 more60 min
Jul 6, 2:53 PM CDTMesoscale DiscussionSPCBond, Champaign, Christian, Clark, Clay, Clinton and 33 more37 min
Jul 6, 3:25 PM CDTSevere Thunderstorm WatchSPCBond, Champaign, Christian, Clark, Clay, Coles and 30 more8 hr
Jul 6, 1:45 AM CDTSevere Thunderstorm WatchSPCAdams, Allen, Blackford, Boone, Carroll, Cass and 31 more5 hr
Jul 6, 1:35 PM CDTMesoscale DiscussionSPCClark, Crawford, Dubois, Floyd, Harrison, Orange and 2 more25 min
Jul 6, 1:50 PM CDTSevere Thunderstorm WatchSPCClark, Crawford, Floyd, Harrison, Orange, Perry and 2 more6 hr
Jul 6, 5:40 PM CDTSevere Thunderstorm WatchSPCBath, Bell, Boyd, Breathitt, Carter, Clay and 32 more5 hr
Jul 5, 10:00 PM CDTSevere Thunderstorm WatchSPCAndrew, Atchison, Buchanan, Holt, Nodaway, Worth6 hr
Jul 6, 1:16 AM CDTMesoscale DiscussionSPCAndrew, Atchison, Buchanan, Holt, Nodaway, Worth119 min
Jul 6, 2:45 AM CDTMesoscale DiscussionSPCAudrain, Bates, Benton, Boone, Buchanan, Caldwell and 33 more2 hr
Jul 6, 3:10 AM CDTSevere Thunderstorm WatchSPCBarton, Bates, Benton, Boone, Buchanan, Caldwell and 30 more5 hr
Jul 5, 7:40 PM CDTMesoscale DiscussionSPCCarter, Johnson, Unicoi65 min

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.