Alert archive / Illinois / Mesoscale Discussions in 2003

Mesoscale Discussion 854

May 8, 20034 states

The Storm Prediction Center issued this mesoscale discussion at May 8, 2003, 2:11 PM CDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
May 8, 2003, 2:11 PM CDT (19:11 UTC)
Expired
May 8, 2003, 4:15 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 70 counties

Adams County, IL, Bond County, IL, Brown County, IL, Calhoun County, IL, Christian County, IL, Clay County, IL, Clinton County, IL, Edwards County, IL, Effingham County, IL, Fayette County, IL, Franklin County, IL, Gallatin County, IL, Greene County, IL, Hamilton County, IL, Hardin County, IL, Jackson County, IL, Jasper County, IL, Jefferson County, IL, Jersey County, IL, Lawrence County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Monroe County, IL, Montgomery County, IL, Morgan County, IL, Perry County, IL, Pike County, IL, Pope County, IL, Randolph County, IL, Richland County, IL, Saint Clair County, IL, Saline County, IL, Sangamon County, IL, Scott County, IL, Shelby County, IL, Wabash County, IL, Washington County, IL, Wayne County, IL, White County, IL, Williamson County, IL, Gibson County, IN, Pike County, IN, Posey County, IN, Spencer County, IN, Vanderburgh County, IN, Warrick County, IN, Daviess County, KY, Hancock County, KY, Henderson County, KY, McLean County, KY, Ohio County, KY, Union County, KY, Webster County, KY, Audrain County, MO, City of Saint Louis, MO, Knox County, MO, Lewis County, MO, Lincoln County, MO, Macon County, MO, Marion County, MO, Monroe County, MO, Montgomery County, MO, Pike County, MO, Ralls County, MO, Randolph County, MO, Saint Charles County, MO, Saint Louis County, MO, Shelby County, MO, Warren County, MO

The radar

The St Louis radar (KLSX), 99 km from the middle of the area, began a volume at 19:14 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, 7.2 hours before the alert went out and 188 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 2003-05-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2003-05-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 50 square meters per square second.1939587897117136Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
797 m above ground
0-6 km bulk shear
50 kt
0-1 km storm-relative helicity
50 m²/s²
0-3 km storm-relative helicity
161 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
May 8, 10:25 AM CDTTornado WatchSPCAlexander, Massac, Pulaski6 hr
May 8, 12:20 PM CDTSevere Thunderstorm WatchSPCAdams, Bond, Brown, Calhoun, Cass, Christian and 42 more4 hr
May 8, 12:24 PM CDTMesoscale DiscussionSPCMassac2 hr
May 8, 2:20 PM CDTMesoscale DiscussionSPCMassac85 min
May 8, 3:40 PM CDTTornado WatchSPCBond, Brown, Cass, Champaign, Christian, Clark and 34 more5 hr
May 8, 5:15 PM CDTTornado WatchSPCEdwards, Gallatin, Hamilton, Hardin, Massac, Pope and 4 more6 hr
May 8, 9:55 AM CDTMesoscale DiscussionSPCAllen, Barren, Butler, Calloway, Christian, Clinton and 14 more3 hr
May 8, 1:18 AM CDTMesoscale DiscussionSPCBarton, Cedar, Jasper, McDonald, Newton, Vernon3 hr
May 8, 1:55 AM CDTSevere Thunderstorm WatchSPCBarry, Barton, Bates, Benton, Cass, Cedar and 12 more5 hr
May 8, 3:51 AM CDTMesoscale DiscussionSPCAndrew, Atchison, Barry, Barton, Benton, Buchanan and 32 more3 hr
May 8, 4:15 AM CDTSevere Thunderstorm WatchSPCAdair, Andrew, Atchison, Buchanan, Caldwell, Carroll and 27 more7 hr
May 8, 7:50 AM CDTMesoscale DiscussionSPCAdair, Andrew, Atchison, Buchanan, Caldwell, Carroll and 27 more85 min
May 8, 7:55 AM CDTMesoscale DiscussionSPCAdair, Andrew, Atchison, Buchanan, Caldwell, Carroll and 27 more95 min
May 8, 1:50 PM CDTTornado WatchSPCAtchison7 hr
May 8, 4:16 PM CDTMesoscale DiscussionSPCAndrew, Barton, Bates, Benton, Buchanan, Caldwell and 35 more29 min
May 8, 4:40 PM CDTTornado WatchSPCAndrew, Barton, Bates, Buchanan, Caldwell, Carroll and 24 more6 hr
May 8, 5:31 PM CDTMesoscale DiscussionSPCBarry, McDonald, Newton, Stone59 min
May 8, 5:45 PM CDTTornado WatchSPCBarry, Lawrence, McDonald, Newton5 hr
May 8, 6:38 PM CDTMesoscale DiscussionSPCAndrew, Atchison, Barton, Bates, Buchanan, Caldwell and 24 more2 hr

Nearby

Mesoscale Discussions in Illinois, 2003Mesoscale Discussions in Missouri, 2003Mesoscale Discussions in Kentucky, 2003Every mesoscale discussion in 2003

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.