Alert archive / Illinois / Mesoscale Discussions in 2004

Mesoscale Discussion 1261

June 14, 200437 counties in Illinois; 19 counties in Iowa; 4 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Jun 14, 2004, 7:42 AM CDT for 37 counties in Illinois; 19 counties in Iowa; 4 counties in Missouri. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Jun 14, 2004, 7:42 AM CDT (12:42 UTC)
Expired
Jun 14, 2004, 9:45 AM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 60 counties

Appanoose County, IA, Cedar County, IA, Clinton County, IA, Davis County, IA, Des Moines County, IA, Henry County, IA, Jackson County, IA, Jefferson County, IA, Johnson County, IA, Keokuk County, IA, Lee County, IA, Louisa County, IA, Monroe County, IA, Muscatine County, IA, Scott County, IA, Van Buren County, IA, Wapello County, IA, Washington County, IA, Wayne County, IA, Bureau County, IL, Carroll County, IL, Cass County, IL, DeKalb County, IL, DeWitt County, IL, Ford County, IL, Fulton County, IL, Grundy County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Iroquois County, IL, Kankakee County, IL, Kendall County, IL, Knox County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, Logan County, IL, Marshall County, IL, Mason County, IL, McDonough County, IL, McLean County, IL, Menard County, IL, Mercer County, IL, Ogle County, IL, Peoria County, IL, Piatt County, IL, Putnam County, IL, Rock Island County, IL, Schuyler County, IL, Stark County, IL, Tazewell County, IL, Warren County, IL, Whiteside County, IL, Will County, IL, Woodford County, IL, Clark County, MO, Putnam County, MO, Schuyler County, MO, Scotland County, MO

The radar

The Quad Cities radar (KDVN), 67 km from the middle of the area, began a volume at 12:45 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

Davenport, (KDVN), launched 12:00Z, 0.7 hours before the alert went out and 69 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, Davenport, at 12:00Z on 2004-06-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 544 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Davenport, at 12:00Z on 2004-06-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 42 square meters per square second.1939Sfc1 km3 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
544 J/kg
Mixed-layer CIN
-42 J/kg
Mixed-layer LCL
1019 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
42 m²/s²
0-3 km storm-relative helicity
62 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 14, 5:25 AM CDTMesoscale DiscussionSPCBureau, DeKalb, Grundy, Henderson, Henry, Kendall and 12 more3 hr
Jun 14, 6:50 AM CDTSevere Thunderstorm WatchSPCBoone, Brown, Bureau, Carroll, Cass, Champaign and 44 more6 hr
Jun 14, 10:03 AM CDTMesoscale DiscussionSPCBoone, Bureau, Champaign, Cook, DeKalb, DeWitt and 32 more57 min
Jun 14, 3:15 PM CDTMesoscale DiscussionSPCBond, Calhoun, Greene, Jersey, Macoupin, Madison and 2 more90 min
Jun 14, 4:10 PM CDTSevere Thunderstorm WatchSPCBond, Calhoun, Clay, Clinton, Edwards, Effingham and 29 more6 hr
Jun 13, 11:18 PM CDTMesoscale DiscussionSPCBuena Vista, Calhoun, Cherokee, Clay, Dickinson, Emmet and 12 more2 hr
Jun 13, 11:56 PM CDTMesoscale DiscussionSPCAdair, Adams, Appanoose, Audubon, Cass, Clarke and 22 more3 hr
Jun 14, 3:05 AM CDTSevere Thunderstorm WatchSPCAdair, Adams, Appanoose, Audubon, Benton, Black Hawk and 68 more6 hr
Jun 14, 11:33 AM CDTMesoscale DiscussionSPCAndrew, Audrain, Buchanan, Caldwell, Carroll, Chariton and 20 more3 hr
Jun 14, 1:20 PM CDTSevere Thunderstorm WatchSPCBates, Benton, Buchanan, Caldwell, Camden, Carroll and 17 more8 hr
Jun 14, 5:09 PM CDTMesoscale DiscussionSPCBates, Benton, Buchanan, Caldwell, Carroll, Cass and 18 more96 min

Nearby

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