Alert archive / Illinois / Severe Thunderstorm Watches in 2005

Severe Thunderstorm Watch 264

May 12, 200526 counties in Illinois; 11 counties in Missouri

The Storm Prediction Center issued this severe thunderstorm watch at May 12, 2005, 10:40 PM CDT for 26 counties in Illinois; 11 counties in Missouri. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
May 12, 2005, 10:40 PM CDT (03:40 UTC)
Expired
May 13, 2005, 5:00 AM CDT
In force
6 hr
Issued by
the Storm Prediction Center
All 37 counties

Adams County, IL, Bond County, IL, Brown County, IL, Calhoun County, IL, Cass County, IL, Christian County, IL, Clinton County, IL, Fayette County, IL, Greene County, IL, Hancock County, IL, Jersey County, IL, Logan County, IL, Macon County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Mason County, IL, Menard County, IL, Montgomery County, IL, Morgan County, IL, Pike County, IL, Saint Clair County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Shelby County, IL, City of Saint Louis, MO, Clark County, MO, Lewis County, MO, Lincoln County, MO, Marion County, MO, Montgomery County, MO, Pike County, MO, Ralls County, MO, Saint Charles County, MO, Saint Louis County, MO, Warren County, MO

The radar

The Lincoln radar (KILX), 84 km from the middle of the area, began a volume at 03:41 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.

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 3.7 hours before the alert went out and 225 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, Davenport, at 00:00Z on 2005-05-13Temperature 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, Davenport, at 00:00Z on 2005-05-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 415 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
777 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
415 m²/s²
0-3 km storm-relative helicity
666 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.4

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 12, 10:00 PM CDTMesoscale DiscussionSPCCalhoun, Pike90 min
May 13, 12:20 PM CDTMesoscale DiscussionSPCCook, DeWitt, DuPage, Ford, Grundy, Iroquois and 13 more85 min
May 13, 12:41 PM CDTMesoscale DiscussionSPCAlexander, Edwards, Gallatin, Hamilton, Hardin, Johnson and 7 more2 hr
May 13, 12:50 PM CDTSevere Thunderstorm WatchSPCClark, Clay, Coles, Crawford, Cumberland, Douglas and 6 more7 hr
May 13, 1:20 PM CDTSevere Thunderstorm WatchSPCGallatin, Hardin, Lawrence, Massac, Pope, Saline and 2 more7 hr
May 13, 2:41 PM CDTMesoscale DiscussionSPCCalhoun, Jersey, Macoupin, Madison2 hr
May 13, 4:47 PM CDTMesoscale DiscussionSPCClark, Clay, Coles, Crawford, Cumberland, Douglas and 12 more88 min
May 12, 8:26 PM CDTMesoscale DiscussionSPCBuchanan, Cass, Clay, Jackson, Platte34 min
May 13, 5:05 PM CDTSevere Thunderstorm WatchSPCBarry, Barton, Camden, Cedar, Christian, Dade and 15 more7 hr

Nearby

Severe Thunderstorm Watches in Illinois, 2005Severe Thunderstorm Watches in Missouri, 2005Every severe thunderstorm watch in 2005

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.