Alert archive / Illinois / Mesoscale Discussions in 2008

Mesoscale Discussion 879

May 11, 200841 counties in Illinois; 21 counties in Indiana

The Storm Prediction Center issued this mesoscale discussion at May 11, 2008, 2:01 AM CDT for 41 counties in Illinois; 21 counties in Indiana. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued
May 11, 2008, 2:01 AM CDT (07:01 UTC)
Expired
May 11, 2008, 3:30 AM CDT
In force
89 min
Issued by
the Storm Prediction Center
All 62 counties

Bond 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, Ford County, IL, Hamilton County, IL, Iroquois County, IL, Jasper County, IL, Jefferson County, IL, Lawrence County, IL, Livingston County, IL, Logan County, IL, Macon County, IL, Marion County, IL, Mason County, IL, McLean County, IL, Menard County, IL, Montgomery County, IL, Moultrie County, IL, Peoria County, IL, Piatt County, IL, Richland County, IL, Sangamon County, IL, Shelby County, IL, Tazewell County, IL, Vermilion County, IL, Wabash County, IL, Wayne County, IL, White County, IL, Woodford County, IL, Benton County, IN, Clay County, IN, Daviess County, IN, Fountain County, IN, Gibson County, IN, Greene County, IN, Knox County, IN, Martin County, IN, Montgomery County, IN, Owen County, IN, Parke County, IN, Pike County, IN, Posey County, IN, Putnam County, IN, Sullivan County, IN, Tippecanoe County, IN, Vanderburgh County, IN, Vermillion County, IN, Vigo County, IN, Warren County, IN, Warrick County, IN

The radar

The Lincoln radar (KILX), 88 km from the middle of the area, began a volume at 07:03 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 nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 7.0 hours before the alert went out and 55 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 2008-05-11Temperature 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 00:00Z on 2008-05-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 4 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1248 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
4 m²/s²
0-3 km storm-relative helicity
185 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 10, 7:14 PM CDTSevere Thunderstorm WatchSPCAlexander, Calhoun, Clinton, Franklin, Jackson, Jersey and 12 more5 hr
May 10, 8:50 PM CDTMesoscale DiscussionSPCAlexander, Jackson, Monroe, Pulaski, Randolph, Saint Clair and 1 more85 min
May 11, 5:35 AM CDTMesoscale DiscussionSPCBartholomew, Boone, Brown, Clark, Clinton, Crawford and 36 more115 min

Nearby

Mesoscale Discussions in Illinois, 2008Mesoscale Discussions in Indiana, 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.