Alert archive / Illinois / Mesoscale Discussions in 2003

Mesoscale Discussion 745

May 4, 20034 states

The Storm Prediction Center issued this mesoscale discussion at May 4, 2003, 8:05 PM CDT for 4 states. It was in force for 85 min.

The area

The outline as issued.

The facts

Issued
May 4, 2003, 8:05 PM CDT (01:05 UTC)
Expired
May 4, 2003, 9:30 PM CDT
In force
85 min
Issued by
the Storm Prediction Center
All 123 counties

Davis County, IA, Des Moines County, IA, Henry County, IA, Jefferson County, IA, Lee County, IA, Louisa County, IA, Muscatine County, IA, Scott County, IA, Van Buren County, IA, Washington County, IA, Adams County, IL, Bond County, IL, Brown County, IL, Bureau County, IL, Calhoun County, IL, Cass County, IL, Champaign County, IL, Christian County, IL, Clark County, IL, Clay County, IL, Clinton County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, DeWitt County, IL, Douglas County, IL, Edgar County, IL, Edwards County, IL, Effingham County, IL, Fayette County, IL, Franklin County, IL, Fulton County, IL, Gallatin County, IL, Greene County, IL, Hamilton County, IL, Hancock County, IL, Hardin County, IL, Henderson County, IL, Henry County, IL, Jackson County, IL, Jasper County, IL, Jefferson County, IL, Jersey County, IL, Johnson County, IL, Knox County, IL, LaSalle County, IL, Lawrence County, IL, Lee County, IL, Livingston 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, Perry County, IL, Piatt County, IL, Pike County, IL, Pope County, IL, Putnam County, IL, Randolph County, IL, Richland County, IL, Rock Island County, IL, Saint Clair County, IL, Saline County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Shelby County, IL, Stark County, IL, Tazewell County, IL, Union County, IL, Wabash County, IL, Warren County, IL, Washington County, IL, Wayne County, IL, White County, IL, Williamson County, IL, Woodford County, IL, Posey County, IN, Audrain County, MO, Bollinger County, MO, Callaway County, MO, Cape Girardeau County, MO, City of Saint Louis, MO, Clark County, MO, Crawford County, MO, Dent County, MO, Franklin County, MO, Gasconade County, MO, Iron County, MO, Jefferson County, MO, Knox County, MO, Lewis County, MO, Lincoln County, MO, Madison County, MO, Marion County, MO, Monroe County, MO, Montgomery County, MO, Osage County, MO, Perry County, MO, Pike County, MO, Ralls County, MO, Reynolds County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Schuyler County, MO, Scotland County, MO, Shelby County, MO, Warren County, MO, Washington County, MO

The radar

The Lincoln radar (KILX), 95 km from the middle of the area, began a volume at 01:07 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 00:00Z, 1.1 hours before the alert went out and 141 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 00:00Z on 2003-05-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 5 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 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 00:00Z on 2003-05-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 408 square meters per square second.1939587897Sfc1 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
5 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
434 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
408 m²/s²
0-3 km storm-relative helicity
531 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.4

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 4, 7:34 PM CDTMesoscale DiscussionSPCAlexander116 min
May 4, 9:26 PM CDTMesoscale DiscussionSPCAlexander, Gallatin, Hardin, Johnson, Massac, Pope and 2 more2 hr
May 4, 10:40 PM CDTTornado WatchSPCEdwards, Franklin, Gallatin, Hamilton, Hardin, Jackson and 14 more5 hr
May 4, 11:05 PM CDTSevere Thunderstorm WatchSPCAdams, Bond, Brown, Calhoun, Cass, Christian and 33 more5 hr
May 5, 1:20 AM CDTTornado WatchSPCAlexander, Massac, Pulaski6 hr
May 5, 1:30 AM CDTMesoscale DiscussionSPCEdwards, Franklin, Gallatin, Hamilton, Hardin, Jackson and 16 more90 min
May 5, 1:46 AM CDTMesoscale DiscussionSPCBond, Christian, Clark, Clay, Clinton, Coles and 25 more89 min
May 5, 3:41 AM CDTMesoscale DiscussionSPCAlexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more34 min
May 5, 3:50 AM CDTTornado WatchSPCAlexander, Franklin, Gallatin, Hamilton, Hardin, Jackson and 13 more6 hr
May 5, 6:32 AM CDTMesoscale DiscussionSPCAlexander, Franklin, Gallatin, Hamilton, Hardin, Jackson and 10 more88 min
May 5, 9:19 AM CDTMesoscale DiscussionSPCAlexander, Franklin, Gallatin, Hamilton, Hardin, Jackson and 13 more56 min
May 5, 12:20 PM CDTTornado WatchSPCHardin7 hr
May 4, 11:37 PM CDTMesoscale DiscussionSPCClark, Crawford, Dubois, Floyd, Harrison, Jefferson and 5 more23 min
May 4, 11:45 PM CDTTornado WatchSPCClark, Crawford, Floyd, Harrison, Orange, Perry and 1 more5 hr
May 5, 2:31 AM CDTMesoscale DiscussionSPCCrawford, Floyd, Harrison89 min
May 5, 7:35 AM CDTTornado WatchSPCHarrison, Perry5 hr
May 5, 10:12 AM CDTMesoscale DiscussionSPCHarrison, Perry93 min
May 5, 11:59 AM CDTMesoscale DiscussionSPCHarrison, Perry61 min
May 5, 2:47 PM CDTMesoscale DiscussionSPCCrawford, Dubois, Floyd, Gibson, Harrison, Perry and 4 more118 min
May 5, 4:27 PM CDTMesoscale DiscussionSPCSteuben3 hr
May 5, 4:42 PM CDTMesoscale DiscussionSPCOhio3 hr
May 5, 6:33 PM CDTMesoscale DiscussionSPCClark, Crawford, Dubois, Floyd, Gibson, Harrison and 6 more57 min
May 4, 7:39 PM CDTMesoscale DiscussionSPCAdair, Adams, Appanoose, Clarke, Dallas, Decatur and 14 more96 min
May 4, 7:19 PM CDTMesoscale DiscussionSPCBarry, Barton, Cedar, Christian, Dade, Dallas and 18 more86 min
May 4, 9:05 PM CDTMesoscale DiscussionSPCBates, Benton, Boone, Caldwell, Carroll, Cass and 23 more85 min
May 4, 9:42 PM CDTMesoscale DiscussionSPCBarry, Barton, Camden, Carter, Cedar, Christian and 28 more93 min
May 5, 12:50 AM CDTTornado WatchSPCBarry, Carter, Cedar, Christian, Dade, Dallas and 21 more5 hr
May 5, 4:18 AM CDTMesoscale DiscussionSPCButler, Dunklin, Mississippi, New Madrid, Pemiscot, Ripley and 1 more57 min
May 5, 4:55 AM CDTTornado WatchSPCDunklin, Pemiscot6 hr
May 5, 1:05 PM CDTTornado WatchSPCDunklin3 hr
May 5, 2:35 PM CDTTornado WatchSPCNew Madrid, Pemiscot7 hr
May 5, 3:25 PM CDTTornado WatchSPCDunklin, Pemiscot7 hr
May 5, 5:18 PM CDTMesoscale DiscussionSPCDunklin, Pemiscot117 min

Nearby

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