Alert archive / Illinois / Mesoscale Discussions in 2006

Mesoscale Discussion 526

April 16, 200651 counties in Illinois; 40 counties in Iowa; 16 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Apr 16, 2006, 1:18 PM CDT for 51 counties in Illinois; 40 counties in Iowa; 16 counties in Missouri. It was in force for 57 min.

The area

The outline as issued.

The facts

Issued
Apr 16, 2006, 1:18 PM CDT (18:18 UTC)
Expired
Apr 16, 2006, 2:15 PM CDT
In force
57 min
Issued by
the Storm Prediction Center
All 107 counties

Appanoose County, IA, Benton County, IA, Black Hawk County, IA, Boone County, IA, Buchanan County, IA, Cedar County, IA, Clinton County, IA, Davis County, IA, Delaware County, IA, Des Moines County, IA, Dubuque County, IA, Grundy County, IA, Hardin County, IA, Henry County, IA, Iowa County, IA, Jackson County, IA, Jasper County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Lee County, IA, Linn County, IA, Louisa County, IA, Lucas County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Monroe County, IA, Muscatine County, IA, Polk County, IA, Poweshiek County, IA, Scott County, IA, Story County, IA, Tama County, IA, Van Buren County, IA, Wapello County, IA, Warren County, IA, Washington County, IA, Wayne County, IA, Adams County, IL, Bond County, IL, Brown County, IL, Bureau County, IL, Calhoun County, IL, Cass County, IL, Christian County, IL, Clay County, IL, Clinton County, IL, DeWitt County, IL, Effingham County, IL, Fayette County, IL, Fulton County, IL, Greene County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Jersey County, IL, Knox County, IL, Logan County, IL, Macon County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Marshall County, IL, Mason County, IL, McDonough County, IL, McLean County, IL, Menard County, IL, Mercer County, IL, Monroe County, IL, Montgomery County, IL, Morgan County, IL, Moultrie County, IL, Peoria County, IL, Piatt County, IL, Pike County, IL, Putnam County, IL, Rock Island County, IL, Saint Clair County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Shelby County, IL, Stark County, IL, Tazewell County, IL, Warren County, IL, Washington County, IL, Wayne County, IL, Whiteside County, IL, Woodford County, IL, City of Saint Louis, MO, Clark County, MO, Franklin County, MO, Jefferson County, MO, Knox County, MO, Lewis County, MO, Lincoln County, MO, Marion County, MO, Montgomery County, MO, Pike County, MO, Ralls County, MO, Saint Charles County, MO, Saint Louis County, MO, Scotland County, MO, Shelby County, MO, Warren County, MO

The radar

The Quad Cities radar (KDVN), 130 km from the middle of the area, began a volume at 18:21 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

Davenport, (KDVN), launched 12:00Z, 6.3 hours before the alert went out and 136 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 2006-04-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 19 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, Davenport, at 12:00Z on 2006-04-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 383 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
19 J/kg
Mixed-layer CIN
-335 J/kg
Mixed-layer LCL
702 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
383 m²/s²
0-3 km storm-relative helicity
404 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.7

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
Apr 15, 10:46 PM CDTMesoscale DiscussionSPCHancock, Henderson, Mercer, Rock Island, Warren119 min
Apr 15, 11:39 PM CDTMesoscale DiscussionSPCAdams, Pike66 min
Apr 16, 7:15 AM CDTMesoscale DiscussionSPCGallatin, Hardin, Johnson, Massac, Pope, Saline2 hr
Apr 16, 10:57 AM CDTMesoscale DiscussionSPCAdams, Boone, Brown, Bureau, Calhoun, Carroll and 33 more2 hr
Apr 16, 11:17 AM CDTTornado WatchSPCAdams, Bond, Brown, Bureau, Calhoun, Cass and 44 more8 hr
Apr 16, 12:20 PM CDTSevere Thunderstorm WatchSPCBoone, Carroll, Cook, DeKalb, DuPage, Ford and 15 more7 hr
Apr 16, 1:08 PM CDTMesoscale DiscussionSPCChampaign, Clark, Crawford, Douglas, Edgar, Ford and 3 more97 min
Apr 16, 1:39 PM CDTTornado WatchSPCChampaign, Clark, Coles, Crawford, Cumberland, Douglas and 11 more7 hr
Apr 16, 3:24 PM CDTMesoscale DiscussionSPCAlexander, Franklin, Gallatin, Hamilton, Hardin, Jackson and 13 more2 hr
Apr 16, 3:43 PM CDTMesoscale DiscussionSPCBond, Bureau, Cass, Champaign, Christian, Clark and 49 more92 min
Apr 16, 3:50 PM CDTMesoscale DiscussionSPCBoone, Cook, DeKalb, DuPage, Kane, Kendall and 6 more85 min
Apr 16, 6:14 PM CDTMesoscale DiscussionSPCChampaign, Clark, Clay, Coles, Crawford, Cumberland and 19 more2 hr
Apr 15, 9:14 PM CDTMesoscale DiscussionSPCAppanoose, Boone, Clarke, Dallas, Decatur, Greene and 10 more91 min

Nearby

Mesoscale Discussions in Illinois, 2006Mesoscale Discussions in Iowa, 2006Mesoscale Discussions in Missouri, 2006Every mesoscale discussion in 2006

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.