Alert archive / Illinois / Mesoscale Discussions in 2005

Mesoscale Discussion 2231

September 19, 200519 counties in Illinois; 17 counties in Iowa; 19 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Sep 19, 2005, 11:49 AM CDT for 19 counties in Illinois; 17 counties in Iowa; 19 counties in Missouri. It was in force for 86 min.

The area

The outline as issued.

The facts

Issued
Sep 19, 2005, 11:49 AM CDT (16:49 UTC)
Expired
Sep 19, 2005, 1:15 PM CDT
In force
86 min
Issued by
the Storm Prediction Center
All 55 counties

Appanoose County, IA, Davis County, IA, Decatur County, IA, Des Moines County, IA, Henry County, IA, Jefferson County, IA, Keokuk County, IA, Lee County, IA, Louisa County, IA, Lucas County, IA, Monroe County, IA, Muscatine County, IA, Scott County, IA, Van Buren County, IA, Wapello County, IA, Washington County, IA, Wayne County, IA, Adams County, IL, Brown County, IL, Cass County, IL, Fulton County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Knox County, IL, Mason County, IL, McDonough County, IL, Menard County, IL, Mercer County, IL, Peoria County, IL, Pike County, IL, Rock Island County, IL, Schuyler County, IL, Stark County, IL, Tazewell County, IL, Warren County, IL, Adair County, MO, Clark County, MO, Daviess County, MO, Gentry County, MO, Grundy County, MO, Harrison County, MO, Knox County, MO, Lewis County, MO, Linn County, MO, Livingston County, MO, Macon County, MO, Marion County, MO, Mercer County, MO, Putnam County, MO, Ralls County, MO, Schuyler County, MO, Scotland County, MO, Shelby County, MO, Sullivan County, MO

The radar

The Quad Cities radar (KDVN), 172 km from the middle of the area, began a volume at 16:50 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, 4.8 hours before the alert went out and 178 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 2005-09-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 603 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 2005-09-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 488 square meters per square second.19395878Sfc1 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
603 J/kg
Mixed-layer CIN
-154 J/kg
Mixed-layer LCL
853 m above ground
0-6 km bulk shear
58 kt
0-1 km storm-relative helicity
488 m²/s²
0-3 km storm-relative helicity
531 m²/s²
Significant tornado parameter
0.0
Supercell composite
14.8

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
Sep 18, 8:13 PM CDTMesoscale DiscussionSPCAdams, Hancock, Henderson, McDonough, Mercer, Schuyler and 1 more62 min
Sep 19, 1:34 AM CDTMesoscale DiscussionSPCBureau, Carroll, Cass, Christian, Coles, DeWitt and 30 more86 min
Sep 19, 1:00 PM CDTSevere Thunderstorm WatchSPCAdams, Brown, Cass, Fulton, Hancock, Henderson and 11 more5 hr
Sep 19, 3:02 PM CDTMesoscale DiscussionSPCChampaign, DeWitt, Ford, Grundy, Iroquois, Kankakee and 6 more88 min
Sep 19, 3:25 PM CDTSevere Thunderstorm WatchSPCChampaign, Coles, DeWitt, Douglas, Edgar, Ford and 9 more6 hr
Sep 19, 3:48 PM CDTMesoscale DiscussionSPCAdams, Brown, Bureau, Cass, Fulton, Hancock and 14 more87 min
Sep 19, 5:20 PM CDTMesoscale DiscussionSPCBond, Calhoun, Christian, Clinton, Effingham, Fayette and 11 more55 min
Sep 19, 5:50 PM CDTSevere Thunderstorm WatchSPCCalhoun, Christian, Greene, Jersey, Logan, Macoupin and 7 more5 hr
Sep 19, 5:54 PM CDTMesoscale DiscussionSPCCass, Champaign, Christian, Clark, Coles, Crawford and 16 more96 min
Sep 18, 10:00 PM CDTMesoscale DiscussionSPCAdair, Adams, Appanoose, Audubon, Benton, Boone and 62 more60 min
Sep 18, 10:05 PM CDTSevere Thunderstorm WatchSPCAdair, Adams, Appanoose, Audubon, Boone, Buena Vista and 52 more5 hr
Sep 18, 11:44 PM CDTMesoscale DiscussionSPCAdair, Audubon, Boone, Calhoun, Carroll, Cass and 10 more91 min

Nearby

Mesoscale Discussions in Illinois, 2005Mesoscale Discussions in Missouri, 2005Mesoscale Discussions in Iowa, 2005Every mesoscale discussion in 2005

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.