Alert archive / Illinois / Mesoscale Discussions in 2003

Mesoscale Discussion 925

May 10, 200320 counties in Illinois; 19 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at May 10, 2003, 6:41 PM CDT for 20 counties in Illinois; 19 counties in Missouri. It was in force for 64 min.

The area

The outline as issued.

The facts

Issued
May 10, 2003, 6:41 PM CDT (23:41 UTC)
Expired
May 10, 2003, 7:45 PM CDT
In force
64 min
Issued by
the Storm Prediction Center
All 39 counties

Adams County, IL, Bond County, IL, Brown County, IL, Calhoun County, IL, Cass County, IL, Christian County, IL, DeWitt County, IL, Greene County, IL, Jersey County, IL, Logan County, IL, Macoupin County, IL, Madison County, IL, Mason County, IL, Menard County, IL, Montgomery County, IL, Morgan County, IL, Pike County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Audrain County, MO, Boone County, MO, Callaway County, MO, City of Saint Louis, MO, Cole County, MO, Cooper County, MO, Lewis County, MO, Lincoln County, MO, Marion County, MO, Moniteau County, MO, Monroe County, MO, Montgomery County, MO, Morgan County, MO, Osage County, MO, Pike County, MO, Ralls County, MO, Saint Charles County, MO, Saint Louis County, MO, Warren County, MO

The radar

The St Louis radar (KLSX), 76 km from the middle of the area, began a volume at 23:44 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, 11.7 hours before the alert went out and 258 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 2003-05-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 474 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 2003-05-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 106 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
474 J/kg
Mixed-layer CIN
-156 J/kg
Mixed-layer LCL
763 m above ground
0-6 km bulk shear
50 kt
0-1 km storm-relative helicity
106 m²/s²
0-3 km storm-relative helicity
168 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.8

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
May 9, 7:47 PM CDTMesoscale DiscussionSPCCalhoun, Greene, Morgan, Pike, Scott88 min
May 9, 8:40 PM CDTMesoscale DiscussionSPCBond, Champaign, Christian, Clark, Clinton, Coles and 18 more2 hr
May 9, 10:04 PM CDTMesoscale DiscussionSPCAdams26 min
May 9, 10:40 PM CDTSevere Thunderstorm WatchSPCBrown, Cass, Champaign, DeWitt, Ford, Fulton and 22 more5 hr
May 10, 5:43 AM CDTMesoscale DiscussionSPCAdams, Brown, Calhoun, Cass, Christian, Fulton and 15 more92 min
May 10, 5:50 AM CDTSevere Thunderstorm WatchSPCAdams, Bond, Brown, Calhoun, Cass, Christian and 25 more5 hr
May 10, 8:30 AM CDTTornado WatchSPCChampaign, Clark, Clay, Coles, Crawford, Cumberland and 9 more6 hr
May 10, 9:25 AM CDTMesoscale DiscussionSPCEdwards, Franklin, Gallatin, Hamilton, Hardin, Jackson and 14 more2 hr
May 10, 10:39 AM CDTMesoscale DiscussionSPCClark, Clay, Coles, Crawford, Cumberland, Douglas and 5 more2 hr
May 10, 10:54 AM CDTMesoscale DiscussionSPCAdams, Alexander, Bond, Brown, Calhoun, Cass and 69 more66 min
May 10, 12:38 PM CDTMesoscale DiscussionSPCClay, Crawford, Jasper, Lawrence, Richland97 min
May 10, 3:17 PM CDTMesoscale DiscussionSPCHancock, Henderson, Mercer, Rock Island58 min
May 10, 3:50 PM CDTTornado WatchSPCBureau, Carroll, Fulton, Henderson, Henry, Jo Daviess and 14 more6 hr
May 10, 4:00 PM CDTTornado WatchSPCFranklin, Jackson, Perry, Randolph, Union5 hr
May 10, 4:48 PM CDTMesoscale DiscussionSPCAdams, Bond, Brown, Calhoun, Cass, Christian and 25 more87 min
May 10, 5:40 PM CDTTornado WatchSPCAdams, Bond, Brown, Calhoun, Cass, Christian and 21 more5 hr
May 9, 11:00 PM CDTSevere Thunderstorm WatchSPCAdair, Barton, Bates, Benton, Caldwell, Carroll and 36 more6 hr
May 10, 1:15 AM CDTSevere Thunderstorm WatchSPCAndrew5 hr
May 10, 1:22 AM CDTMesoscale DiscussionSPCNewton83 min
May 10, 2:28 AM CDTMesoscale DiscussionSPCAndrew, Buchanan92 min
May 10, 3:05 AM CDTTornado WatchSPCBarton, Bates, Benton, Cedar, Dade, Henry and 7 more5 hr
May 10, 3:15 AM CDTSevere Thunderstorm WatchSPCAdair, Andrew, Atchison, Buchanan, Caldwell, Carroll and 25 more5 hr
May 10, 5:27 AM CDTMesoscale DiscussionSPCBarton, Bates, Benton, Cass, Cedar, Dade and 9 more93 min
May 10, 7:06 AM CDTMesoscale DiscussionSPCAdair, Andrew, Atchison, Buchanan, Caldwell, Carroll and 25 more54 min
May 10, 10:58 AM CDTMesoscale DiscussionSPCAdair, Andrew, Audrain, Barton, Bates, Benton and 42 more2 hr
May 10, 11:35 AM CDTTornado WatchSPCAdair, Audrain, Bates, Benton, Boone, Caldwell and 38 more7 hr
May 10, 11:55 AM CDTTornado WatchSPCBarry, Barton, Camden, Cedar, Christian, Dade and 13 more7 hr
May 10, 1:42 PM CDTMesoscale DiscussionSPCAdair, Audrain, Bates, Benton, Boone, Caldwell and 38 more2 hr
May 10, 1:59 PM CDTMesoscale DiscussionSPCBarry, Barton, Camden, Cedar, Christian, Dade and 12 more2 hr
May 10, 3:30 PM CDTMesoscale DiscussionSPCCrawford, Dent, Douglas, Franklin, Gasconade, Howell and 16 more2 hr

Nearby

Mesoscale Discussions in Illinois, 2003Mesoscale Discussions in Missouri, 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.