Alert archive / Illinois / Mesoscale Discussions in 2005

Mesoscale Discussion 1637

July 4, 200547 counties in Illinois; Lake County, Indiana; 4 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Jul 4, 2005, 11:13 AM CDT for 47 counties in Illinois; Lake County, Indiana; 4 counties in Missouri. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued
Jul 4, 2005, 11:13 AM CDT (16:13 UTC)
Expired
Jul 4, 2005, 12:45 PM CDT
In force
92 min
Issued by
the Storm Prediction Center
All 52 counties

Bond County, IL, Bureau County, IL, Calhoun County, IL, Cass County, IL, Champaign County, IL, Christian County, IL, Clinton County, IL, Cook County, IL, DeKalb County, IL, DeWitt County, IL, DuPage County, IL, Fayette County, IL, Ford County, IL, Fulton County, IL, Greene County, IL, Grundy County, IL, Iroquois County, IL, Jersey County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, LaSalle County, IL, Livingston County, IL, Logan County, IL, Macon County, IL, Macoupin County, IL, Madison County, IL, Marshall County, IL, Mason County, IL, McLean County, IL, Menard County, IL, Monroe County, IL, Montgomery County, IL, Morgan County, IL, Moultrie County, IL, Peoria County, IL, Piatt County, IL, Putnam County, IL, Saint Clair County, IL, Sangamon County, IL, Scott County, IL, Shelby County, IL, Stark County, IL, Tazewell County, IL, Washington County, IL, Will County, IL, Woodford County, IL, Lake County, IN, City of Saint Louis, MO, Jefferson County, MO, Saint Charles County, MO, Saint Louis County, MO

The radar

The Lincoln radar (KILX), 10 km from the middle of the area, began a volume at 16:13 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

Lincoln, IL (KILX), launched 12:00Z, 4.2 hours before the alert went out and 62 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 2005-07-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 149 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 2005-07-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -53 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
149 J/kg
Mixed-layer CIN
-169 J/kg
Mixed-layer LCL
1395 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
-53 m²/s²
0-3 km storm-relative helicity
4 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 4, 2:53 AM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, Cook, DeKalb, DuPage and 25 more97 min
Jul 4, 12:00 PM CDTSevere Thunderstorm WatchSPCBond, Champaign, Christian, Clark, Clay, Clinton and 41 more6 hr
Jul 4, 12:21 PM CDTMesoscale DiscussionSPCMonroe84 min
Jul 4, 12:50 PM CDTSevere Thunderstorm WatchSPCAlexander, Franklin, Hamilton, Jackson, Johnson, Perry and 4 more6 hr
Jul 4, 3:22 PM CDTMesoscale DiscussionSPCAlexander, Bond, Champaign, Christian, Clark, Clay and 49 more83 min
Jul 4, 5:41 PM CDTMesoscale DiscussionSPCAlexander, Franklin, Gallatin, Hamilton, Hardin, Jackson and 10 more94 min
Jul 4, 2:18 PM CDTMesoscale DiscussionSPCElkhart, LaGrange, Saint Joseph87 min
Jul 4, 2:50 PM CDTSevere Thunderstorm WatchSPCAdams, Allen, Cass, DeKalb, Elkhart, Fulton and 17 more4 hr
Jul 3, 7:20 PM CDTMesoscale DiscussionSPCBarry, Barton, Bates, Benton, Cedar, Christian and 19 more115 min
Jul 3, 7:45 PM CDTSevere Thunderstorm WatchSPCBarton, Bates, Camden, Cedar, Christian, Dade and 13 more7 hr
Jul 3, 8:56 PM CDTMesoscale DiscussionSPCAndrew, Atchison, Buchanan, Clay, Clinton, DeKalb and 5 more64 min
Jul 3, 9:48 PM CDTMesoscale DiscussionSPCBarry, Barton, Benton, Camden, Cedar, Christian and 30 more87 min
Jul 4, 12:01 AM CDTMesoscale DiscussionSPCBarry, Barton, Christian, Dade, Douglas, Greene and 9 more89 min
Jul 4, 1:40 AM CDTMesoscale DiscussionSPCBarry, McDonald, Newton35 min
Jul 4, 2:15 AM CDTSevere Thunderstorm WatchSPCBarry, McDonald, Stone, Taney7 hr
Jul 4, 5:12 AM CDTMesoscale DiscussionSPCBarry, McDonald, Stone, Taney63 min

Nearby

Mesoscale Discussions in Illinois, 2005Mesoscale Discussions in Missouri, 2005Mesoscale Discussions in Indiana, 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.