Alert archive / Illinois / Tornado Watches in 2010

Tornado Watch 267

June 5, 201024 counties in Illinois; 5 counties in Indiana

The Storm Prediction Center issued this tornado watch at Jun 5, 2010, 7:37 PM CDT for 24 counties in Illinois; 5 counties in Indiana. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Jun 5, 2010, 7:37 PM CDT (00:37 UTC)
Expired
Jun 6, 2010, 2:00 AM CDT
In force
6 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
60 kt
All 29 counties

Champaign County, IL, Christian County, IL, Clark County, IL, Coles County, IL, Cumberland County, IL, DeWitt County, IL, Douglas County, IL, Edgar County, IL, Ford County, IL, Grundy County, IL, Iroquois County, IL, Kankakee County, IL, Kendall County, IL, LaSalle County, IL, Livingston County, IL, Logan County, IL, Macon County, IL, McLean County, IL, Moultrie County, IL, Piatt County, IL, Sangamon County, IL, Shelby County, IL, Vermilion County, IL, Will County, IL, Benton County, IN, Jasper County, IN, Lake County, IN, Newton County, IN, Porter County, IN

The radar

The Lincoln radar (KILX), 78 km from the middle of the area, began a volume at 00:38 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.

What SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes
60%
One or more EF2 to EF5 tornadoes
40%
Ten or more severe wind reports
30%
One or more gusts of 65 knots or more
30%
Ten or more severe hail reports
40%
One or more hailstones of 2 inches or more
30%
Six or more combined severe hail and wind reports
80%

Warnings issued inside it

18 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Jun 5, 8:17 PM CDTTornado WarningLOTLaSalle, Livingston43 min
Jun 5, 8:35 PM CDTTornado WarningLOTGrundy, LaSalle40 min
Jun 5, 8:46 PM CDTTornado WarningLOTGrundy, LaSalle, Livingston44 min
Jun 5, 9:14 PM CDTTornado WarningLOTGrundy, Kankakee, Will46 min
Jun 5, 9:23 PM CDTTornado WarningLOTGrundy, Kankakee, Livingston52 min
Jun 5, 9:43 PM CDTSevere Thunderstorm WarningLOTGrundy, LaSalle, Livingston32 min
Jun 5, 9:48 PM CDTSevere Thunderstorm WarningILXLogan, Mason, Tazewell27 min
Jun 5, 9:59 PM CDTSevere Thunderstorm WarningLOTFord, Grundy, Iroquois, Kankakee, Livingston, Will46 min
Jun 5, 10:09 PM CDTTornado WarningLOTIroquois, Kankakee51 min
Jun 5, 10:15 PM CDTTornado WarningLOTFord, Iroquois, Livingston45 min
Jun 5, 10:17 PM CDTTornado WarningILXDeWitt, Logan, McLean, Tazewell28 min
Jun 5, 10:21 PM CDTTornado WarningILXLogan, Mason, Tazewell24 min
Jun 5, 10:42 PM CDTSevere Thunderstorm WarningLOTFord, Iroquois, Kankakee63 min
Jun 5, 10:47 PM CDTTornado WarningILXDeWitt, Logan43 min
Jun 5, 10:49 PM CDTTornado WarningLOTJasper, Porter26 min
Jun 5, 10:54 PM CDTFlash Flood WarningLOTFord, Grundy, Iroquois, Kankakee, Livingston3 hr
Jun 5, 11:10 PM CDTTornado WarningILXMacon35 min
Jun 6, 12:33 AM CDTFlash Flood WarningLOTJasper117 min

Discussions around it

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

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 0.6 hours before the alert went out and 61 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 2010-06-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1457 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 00:00Z on 2010-06-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 249 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
1457 J/kg
Mixed-layer CIN
-146 J/kg
Mixed-layer LCL
1235 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
249 m²/s²
0-3 km storm-relative helicity
352 m²/s²
Significant tornado parameter
0.6
Supercell composite
6.8

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 5, 9:20 PM CDTMesoscale DiscussionSPCAdams, Brown, Bureau, Calhoun, Cass, Champaign and 43 more115 min
Jun 5, 11:17 PM CDTMesoscale DiscussionSPCChampaign, Christian, Coles, DeWitt, Douglas, Edgar and 10 more118 min
Jun 5, 8:47 PM CDTMesoscale DiscussionSPCAdams, Allen, Blackford, Carroll, Cass, Clinton and 23 more58 min
Jun 5, 9:11 PM CDTTornado WatchSPCAdams, Allen, Blackford, Boone, Carroll, Cass and 48 more7 hr
Jun 6, 1:03 AM CDTTornado WatchSPCFayette, Union, Wayne7 hr
Jun 6, 2:38 AM CDTMesoscale DiscussionSPCAdams, Blackford, Boone, Clay, Clinton, Delaware and 24 more2 hr
Jun 6, 6:05 AM CDTMesoscale DiscussionSPCUnion115 min

Nearby

Tornado Watches in Illinois, 2010Tornado Watches in Indiana, 2010Every tornado watch in 2010

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.