Alert archive / Illinois / Severe Thunderstorm Watches in 2008

Severe Thunderstorm Watch 623

June 27, 20084 states

The Storm Prediction Center issued this severe thunderstorm watch at Jun 27, 2008, 5:14 PM CDT for 4 states. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: Jun 27, 2008, 5:14 PM CDT (22:14 UTC)
Expired: Jun 27, 2008, 10:00 PM CDT
In force: 5 hr
Issued by: the Storm Prediction Center

All 43 counties

Alexander County, IL, Edwards County, IL, Franklin County, IL, Gallatin County, IL, Hamilton County, IL, Hardin County, IL, Jackson County, IL, Jefferson County, IL, Johnson County, IL, Massac County, IL, Perry County, IL, Pope County, IL, Pulaski County, IL, Saline County, IL, Union County, IL, Wabash County, IL, Wayne County, IL, White County, IL, Williamson County, IL, Crawford County, IN, Dubois County, IN, Gibson County, IN, Orange County, IN, Perry County, IN, Pike County, IN, Posey County, IN, Spencer County, IN, Vanderburgh County, IN, Warrick County, IN, Crittenden County, KY, Daviess County, KY, Hancock County, KY, Henderson County, KY, Hopkins County, KY, Livingston County, KY, McLean County, KY, Muhlenberg County, KY, Ohio County, KY, Union County, KY, Webster County, KY, Bollinger County, MO, Cape Girardeau County, MO, Perry County, MO

The radar

The Evansville,IN radar (KVWX), 71 km from the middle of the area, began a volume at 22:17 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.

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Jun 27, 5:21 PM CDT	Severe Thunderstorm Warning	PAH	Perry	39 min
Jun 27, 5:40 PM CDT	Tornado Warning	PAH	Jefferson	35 min
Jun 27, 6:09 PM CDT	Severe Thunderstorm Warning	PAH	Franklin, Jefferson, Perry	36 min
Jun 27, 6:16 PM CDT	Severe Thunderstorm Warning	PAH	Wayne	44 min
Jun 27, 6:20 PM CDT	Severe Thunderstorm Warning	PAH	Cape Girardeau	25 min
Jun 27, 6:22 PM CDT	Severe Thunderstorm Warning	PAH	Hamilton, White	38 min
Jun 27, 6:32 PM CDT	Severe Thunderstorm Warning	PAH	Union	43 min
Jun 27, 6:33 PM CDT	Tornado Warning	PAH	Wayne	27 min
Jun 27, 6:42 PM CDT	Severe Thunderstorm Warning	PAH	Williamson	33 min
Jun 27, 6:44 PM CDT	Severe Thunderstorm Warning	PAH	Hamilton, White	31 min
Jun 27, 6:58 PM CDT	Severe Thunderstorm Warning	PAH	Saline	47 min
Jun 27, 6:59 PM CDT	Severe Thunderstorm Warning	PAH	Edwards, Hamilton, Wabash, Wayne, White	46 min
Jun 27, 7:06 PM CDT	Tornado Warning	PAH	Edwards, Wabash, Wayne, White	24 min
Jun 27, 7:19 PM CDT	Severe Thunderstorm Warning	PAH	Wabash, White	26 min
Jun 27, 7:22 PM CDT	Severe Thunderstorm Warning	PAH	Gallatin	38 min
Jun 27, 7:40 PM CDT	Severe Thunderstorm Warning	PAH	Henderson, Union	65 min
Jun 27, 7:46 PM CDT	Severe Thunderstorm Warning	PAH	Gibson, Pike, Posey, Spencer, Vanderburgh, Warrick	44 min
Jun 27, 7:51 PM CDT	Severe Thunderstorm Warning	LMK	Dubois	39 min
Jun 27, 8:16 PM CDT	Severe Thunderstorm Warning	LMK	Orange	44 min
Jun 27, 8:27 PM CDT	Severe Thunderstorm Warning	LMK	Crawford, Dubois, Harrison, Orange, Perry, Washington	48 min
Jun 27, 8:28 PM CDT	Severe Thunderstorm Warning	PAH	Spencer	32 min
Jun 27, 8:34 PM CDT	Tornado Warning	LMK	Orange	26 min
Jun 27, 8:39 PM CDT	Severe Thunderstorm Warning	PAH	Warrick	36 min
Jun 27, 9:11 PM CDT	Severe Thunderstorm Warning	LMK	Breckinridge, Grayson, Hancock, Ohio	34 min

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 10.2 hours before the alert went out and 223 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 301 J/kg
Mixed-layer CIN: -121 J/kg
Mixed-layer LCL: 1261 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 9 m²/s²
0-3 km storm-relative helicity: 55 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 27, 11:55 AM CDT	Mesoscale Discussion	SPC	Bond, Brown, Bureau, Calhoun, Cass, Champaign and 59 more	3 hr
Jun 27, 12:30 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Bond, Brown, Bureau, Calhoun, Cass and 48 more	8 hr
Jun 27, 3:04 PM CDT	Mesoscale Discussion	SPC	Adams, Bond, Brown, Calhoun, Cass, Champaign and 48 more	86 min
Jun 27, 3:36 PM CDT	Severe Thunderstorm Watch	SPC	Clark, Clay, Coles, Crawford, Cumberland, Douglas and 6 more	6 hr
Jun 27, 5:46 PM CDT	Severe Thunderstorm Watch	SPC	Jo Daviess, Rock Island	4 hr
Jun 27, 6:46 PM CDT	Mesoscale Discussion	SPC	Adams, Bartholomew, Clark, Dearborn, Decatur, Fayette and 18 more	89 min
Jun 27, 1:37 PM CDT	Mesoscale Discussion	SPC	Andrew, Atchison, Bates, Buchanan, Cass, Clay and 7 more	2 hr
Jun 27, 4:04 PM CDT	Severe Thunderstorm Watch	SPC	Andrew, Atchison, Bates, Buchanan, Cass, Clay and 3 more	4 hr
Jun 27, 5:33 PM CDT	Mesoscale Discussion	SPC	Adair, Daviess, Gentry, Grundy, Harrison, Mercer and 4 more	87 min

Nearby

Severe Thunderstorm Watches in Illinois, 2008 Severe Thunderstorm Watches in Kentucky, 2008 Severe Thunderstorm Watches in Indiana, 2008 Every severe thunderstorm watch 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.