Alert archive / Illinois / Mesoscale Discussions in 2008

Mesoscale Discussion 1098

May 30, 200830 counties in Illinois; 12 counties in Indiana; 5 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at May 30, 2008, 1:14 PM CDT for 30 counties in Illinois; 12 counties in Indiana; 5 counties in Missouri. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
May 30, 2008, 1:14 PM CDT (18:14 UTC)
Expired
May 30, 2008, 3:15 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 47 counties

Adams County, IL, Brown County, IL, Calhoun County, IL, Cass County, IL, Champaign County, IL, Christian County, IL, Coles County, IL, DeWitt County, IL, Douglas County, IL, Edgar County, IL, Ford County, IL, Greene County, IL, Iroquois County, IL, Jersey County, IL, Logan County, IL, Macon County, IL, Macoupin County, IL, Madison County, IL, Mason County, IL, McLean County, IL, Menard County, IL, Montgomery County, IL, Morgan County, IL, Moultrie County, IL, Piatt County, IL, Pike County, IL, Sangamon County, IL, Scott County, IL, Shelby County, IL, Vermilion County, IL, Benton County, IN, Carroll County, IN, Cass County, IN, Clinton County, IN, Fountain County, IN, Jasper County, IN, Newton County, IN, Pulaski County, IN, Tippecanoe County, IN, Vermillion County, IN, Warren County, IN, White County, IN, City of Saint Louis, MO, Lincoln County, MO, Pike County, MO, Saint Charles County, MO, Saint Louis County, MO

The radar

The Lincoln radar (KILX), 26 km from the middle of the area, began a volume at 18:13 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, 6.2 hours before the alert went out and 53 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 2008-05-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 57 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 2008-05-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 128 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
57 J/kg
Mixed-layer CIN
-325 J/kg
Mixed-layer LCL
1164 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
128 m²/s²
0-3 km storm-relative helicity
106 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 30, 1:19 AM CDTTornado WatchSPCHancock, Henderson, McDonough, Mercer, Rock Island, Warren8 hr
May 30, 2:17 AM CDTMesoscale DiscussionSPCHancock, Henderson, McDonough, Mercer, Rock Island, Warren88 min
May 30, 6:00 AM CDTMesoscale DiscussionSPCCarroll, Hancock, Henderson, Henry, Knox, Mercer and 3 more2 hr
May 30, 7:56 AM CDTTornado WatchSPCAdams, Brown, Bureau, Cass, Cook, DuPage and 26 more6 hr
May 30, 10:13 AM CDTMesoscale DiscussionSPCCook, DuPage, Grundy, Kendall, LaSalle, Will62 min
May 30, 1:56 PM CDTTornado WatchSPCAdams, Bond, Brown, Calhoun, Cass, Champaign and 37 more8 hr
May 30, 4:29 PM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, Cook, DeKalb, DuPage and 19 more61 min
May 30, 5:18 PM CDTMesoscale DiscussionSPCAdams, Bond, Brown, Calhoun, Cass, Champaign and 37 more87 min
May 29, 7:37 PM CDTMesoscale DiscussionSPCAtchison, Gentry, Harrison, Holt, Mercer, Nodaway and 2 more53 min
May 29, 8:13 PM CDTTornado WatchSPCAndrew, Atchison, Buchanan, Daviess, DeKalb, Gentry and 10 more8 hr
May 29, 11:34 PM CDTMesoscale DiscussionSPCAndrew, Atchison, Buchanan, Caldwell, Clinton, Daviess and 12 more56 min
May 30, 2:23 PM CDTMesoscale DiscussionSPCBates, Caldwell, Carroll, Cass, Chariton, Clay and 15 more97 min
May 30, 2:42 PM CDTTornado WatchSPCAdair, Barton, Bates, Benton, Caldwell, Camden and 36 more7 hr

Nearby

Mesoscale Discussions in Illinois, 2008Mesoscale Discussions in Indiana, 2008Mesoscale Discussions in Missouri, 2008Every mesoscale discussion in 2008

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.