Alert archive / Illinois / Mesoscale Discussions in 2004

Mesoscale Discussion 1541

July 6, 200434 counties in Illinois

The Storm Prediction Center issued this mesoscale discussion at Jul 6, 2004, 9:00 AM CDT for 34 counties in Illinois. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued
Jul 6, 2004, 9:00 AM CDT (14:00 UTC)
Expired
Jul 6, 2004, 10:00 AM CDT
In force
60 min
Issued by
the Storm Prediction Center
All 34 counties

Adams County, IL, Brown County, IL, Calhoun County, IL, Cass County, IL, Champaign County, IL, Christian County, IL, Clark County, IL, Coles County, IL, Cumberland County, IL, DeWitt County, IL, Douglas County, IL, Edgar County, IL, Ford County, IL, Fulton County, IL, Greene County, IL, Hancock County, IL, Logan County, IL, Macon County, IL, Macoupin County, IL, Mason County, IL, McDonough County, IL, McLean County, IL, Menard County, IL, Montgomery County, IL, Morgan County, IL, Moultrie County, IL, Piatt County, IL, Pike County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Shelby County, IL, Tazewell County, IL, Vermilion County, IL

The radar

The Lincoln radar (KILX), 51 km from the middle of the area, began a volume at 14:04 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, 2.0 hours before the alert went out and 86 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 12:00Z on 2004-07-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 467 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, Lincoln, IL at 12:00Z on 2004-07-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 105 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
467 J/kg
Mixed-layer CIN
-139 J/kg
Mixed-layer LCL
956 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
105 m²/s²
0-3 km storm-relative helicity
136 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.0

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 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, 11:01 AM CDTMesoscale DiscussionSPCAlexander, Bond, Clay, Clinton, Crawford, Cumberland and 29 more59 min
Jul 6, 12:10 PM CDTSevere Thunderstorm WatchSPCAlexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 17 more6 hr
Jul 6, 2:34 PM CDTMesoscale DiscussionSPCAlexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 17 more56 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, 5:37 PM CDTMesoscale DiscussionSPCAlexander, Johnson, Pulaski, Union53 min

Nearby

Mesoscale Discussions in Illinois, 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.