Alert archive / Illinois / Mesoscale Discussions in 2006

Mesoscale Discussion 712

May 1, 200630 counties in Illinois; 13 counties in Indiana; 19 counties in Kentucky

The Storm Prediction Center issued this mesoscale discussion at May 1, 2006, 8:05 PM CDT for 30 counties in Illinois; 13 counties in Indiana; 19 counties in Kentucky. It was in force for 85 min.

The area

The outline as issued.

The facts

Issued
May 1, 2006, 8:05 PM CDT (01:05 UTC)
Expired
May 1, 2006, 9:30 PM CDT
In force
85 min
Issued by
the Storm Prediction Center
All 62 counties

Christian County, IL, Clark County, IL, Clay County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, Douglas County, IL, Edgar County, IL, Edwards County, IL, Effingham County, IL, Fayette County, IL, Franklin County, IL, Gallatin County, IL, Hamilton County, IL, Hardin County, IL, Jasper County, IL, Jefferson County, IL, Johnson County, IL, Lawrence County, IL, Marion County, IL, Massac County, IL, Moultrie County, IL, Pope County, IL, Richland County, IL, Saline County, IL, Shelby County, IL, Wabash County, IL, Wayne County, IL, White County, IL, Williamson County, IL, Daviess County, IN, Dubois County, IN, Gibson County, IN, Greene County, IN, Knox County, IN, Martin County, IN, Pike County, IN, Posey County, IN, Spencer County, IN, Sullivan County, IN, Vanderburgh County, IN, Vigo County, IN, Warrick County, IN, Ballard County, KY, Caldwell County, KY, Carlisle County, KY, Crittenden County, KY, Daviess County, KY, Graves County, KY, Hancock County, KY, Henderson County, KY, Hickman County, KY, Hopkins County, KY, Livingston County, KY, Lyon County, KY, Marshall County, KY, McCracken County, KY, McLean County, KY, Muhlenberg County, KY, Ohio County, KY, Union County, KY, Webster County, KY

The radar

The Evansville,IN radar (KVWX), 51 km from the middle of the area, began a volume at 01:04 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 178 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 2006-05-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 498 joules per kilogram.LCLEL10008507005003002001001 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 2006-05-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 157 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
498 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
668 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
157 m²/s²
0-3 km storm-relative helicity
249 m²/s²
Significant tornado parameter
0.4
Supercell composite
2.6

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 1, 10:12 PM CDTMesoscale DiscussionSPCAlexander, Bond, Clark, Clay, Clinton, Coles and 32 more93 min
May 1, 11:28 PM CDTSevere Thunderstorm WatchSPCAlexander, Clinton, Edwards, Franklin, Gallatin, Hamilton and 19 more6 hr
May 2, 2:08 AM CDTMesoscale DiscussionSPCAlexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 18 more2 hr
May 2, 1:28 AM CDTSevere Thunderstorm WatchSPCClark, Crawford, Dubois, Floyd, Harrison, Jefferson and 5 more4 hr
May 2, 5:43 AM CDTMesoscale DiscussionSPCAdair, Allen, Barren, Boyle, Breckinridge, Bullitt and 29 more62 min
May 2, 4:30 PM CDTMesoscale DiscussionSPCCalloway90 min

Nearby

Mesoscale Discussions in Illinois, 2006Mesoscale Discussions in Kentucky, 2006Mesoscale Discussions in Indiana, 2006Every mesoscale discussion in 2006

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.