Alert archive / Illinois / Mesoscale Discussions in 2003

Mesoscale Discussion 1709

July 8, 200331 counties in Illinois; 7 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Jul 8, 2003, 1:21 PM CDT for 31 counties in Illinois; 7 counties in Missouri. It was in force for 24 min.

The area

The outline as issued.

The facts

Issued
Jul 8, 2003, 1:21 PM CDT (18:21 UTC)
Expired
Jul 8, 2003, 1:45 PM CDT
In force
24 min
Issued by
the Storm Prediction Center
All 38 counties

Adams County, IL, Brown County, IL, Calhoun County, IL, Cass County, IL, Champaign County, IL, Christian County, IL, Coles County, IL, Cumberland County, IL, DeWitt County, IL, Douglas County, IL, Effingham County, IL, Fayette County, IL, Greene County, IL, Hancock County, IL, Jasper County, IL, Jersey County, IL, Logan County, IL, Macon County, IL, Macoupin County, IL, Mason County, IL, McDonough County, IL, Menard County, IL, Montgomery County, IL, Morgan County, IL, Moultrie County, IL, Piatt County, IL, Pike County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Shelby County, IL, Audrain County, MO, Clark County, MO, Lewis County, MO, Lincoln County, MO, Marion County, MO, Pike County, MO, Ralls County, MO

The radar

The Lincoln radar (KILX), 88 km from the middle of the area, began a volume at 18:22 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, 6.4 hours before the alert went out and 148 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 2003-07-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1887 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 2003-07-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -68 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
1887 J/kg
Mixed-layer CIN
-80 J/kg
Mixed-layer LCL
1341 m above ground
0-6 km bulk shear
5 kt
0-1 km storm-relative helicity
-68 m²/s²
0-3 km storm-relative helicity
-48 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 7, 7:16 PM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, DeKalb, DuPage, Henry and 9 more3 hr
Jul 7, 7:40 PM CDTSevere Thunderstorm WatchSPCBoone, Bureau, Carroll, Cook, DeKalb, DuPage and 20 more3 hr
Jul 7, 10:18 PM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, Cook, DeKalb, DuPage and 21 more57 min
Jul 7, 11:00 PM CDTSevere Thunderstorm WatchSPCCook, Iroquois, Kankakee, Lake, Vermilion5 hr
Jul 7, 11:50 PM CDTMesoscale DiscussionSPCIroquois, Vermilion85 min
Jul 8, 8:50 AM CDTMesoscale DiscussionSPCAdams, Brown, Hancock, Henderson, McDonough, Mercer and 2 more115 min
Jul 8, 9:50 AM CDTSevere Thunderstorm WatchSPCBoone, Bureau, Carroll, Cook, DeKalb, DuPage and 28 more5 hr
Jul 8, 12:25 PM CDTMesoscale DiscussionSPCClark, Clay, Crawford, Cumberland, Edwards, Effingham and 4 more95 min
Jul 8, 12:59 PM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, Cook, DeKalb, DuPage and 28 more91 min
Jul 8, 1:45 PM CDTTornado WatchSPCAdams, Brown, Bureau, Carroll, Cass, Champaign and 48 more5 hr
Jul 8, 3:40 PM CDTMesoscale DiscussionSPCAdams, Brown, Bureau, Cass, Champaign, Christian and 41 more95 min
Jul 8, 6:15 PM CDTSevere Thunderstorm WatchSPCAdams, Brown, Cass, Champaign, Christian, Clark and 37 more5 hr
Jul 8, 6:46 PM CDTMesoscale DiscussionSPCAdams, Brown, Cass, Champaign, DeWitt, Douglas and 14 more3 hr
Jul 7, 10:20 PM CDTSevere Thunderstorm WatchSPCAtchison7 hr
Jul 8, 1:34 AM CDTMesoscale DiscussionSPCAtchison116 min
Jul 8, 5:13 PM CDTMesoscale DiscussionSPCAdair, Andrew, Atchison, Daviess, DeKalb, Gentry and 10 more92 min

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.