Alert archive / Illinois / Mesoscale Discussions in 2014

Mesoscale Discussion 538

May 9, 20146 states

The Storm Prediction Center issued this mesoscale discussion at May 9, 2014, 2:35 PM CDT for 6 states. It was in force for 115 min.

The area

The outline as issued.

The facts

Issued: May 9, 2014, 2:35 PM CDT (19:35 UTC)
Expired: May 9, 2014, 4:30 PM CDT
In force: 115 min
Issued by: the Storm Prediction Center

All 98 counties

Clay County, AR, Alexander County, IL, Clark County, IL, Clay County, IL, Clinton 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, Jackson County, IL, Jasper County, IL, Jefferson County, IL, Johnson County, IL, Lawrence County, IL, Marion County, IL, Massac County, IL, Perry County, IL, Pope County, IL, Pulaski County, IL, Randolph County, IL, Richland County, IL, Saline County, IL, Union County, IL, Vermilion County, IL, Wabash County, IL, Washington County, IL, Wayne County, IL, White County, IL, Williamson County, IL, Boone County, IN, Brown County, IN, Clay County, IN, Daviess County, IN, Dubois County, IN, Fountain County, IN, Gibson County, IN, Greene County, IN, Hendricks County, IN, Knox County, IN, Lawrence County, IN, Martin County, IN, Monroe County, IN, Montgomery County, IN, Morgan County, IN, Orange County, IN, Owen County, IN, Parke County, IN, Pike County, IN, Posey County, IN, Putnam County, IN, Spencer County, IN, Sullivan County, IN, Tippecanoe County, IN, Vanderburgh County, IN, Vermillion County, IN, Vigo County, IN, Warren County, IN, Warrick County, IN, Ballard County, KY, Caldwell County, KY, Carlisle County, KY, Crittenden County, KY, Daviess County, KY, Fulton County, KY, Graves 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, Union County, KY, Webster County, KY, Bollinger County, MO, Butler County, MO, Cape Girardeau County, MO, Dunklin County, MO, Madison County, MO, Mississippi County, MO, New Madrid County, MO, Pemiscot County, MO, Perry County, MO, Ripley County, MO, Sainte Genevieve County, MO, Scott County, MO, Stoddard County, MO, Wayne County, MO, Lake County, TN

The radar

The Evansville,IN radar (KVWX), 77 km from the middle of the area, began a volume at 19:37 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 12:00Z, 7.6 hours before the alert went out and 200 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: 506 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 580 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 105 m²/s²
0-3 km storm-relative helicity: 101 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.

Issued	Product	Office	Counties	Lasted
May 9, 3:18 PM CDT	Mesoscale Discussion	SPC	Columbia, Hempstead, Howard, Lafayette, Little River, Miller and 3 more	117 min
May 9, 6:14 PM CDT	Mesoscale Discussion	SPC	Columbia, Hempstead, Lafayette, Miller	61 min
May 9, 6:25 PM CDT	Mesoscale Discussion	SPC	Clay, Craighead, Greene	65 min
May 9, 11:46 AM CDT	Mesoscale Discussion	SPC	Bond, Christian, Clark, Clay, Clinton, Coles and 30 more	59 min
May 9, 12:50 PM CDT	Severe Thunderstorm Watch	SPC	Alexander, Bond, Clark, Clay, Clinton, Coles and 37 more	7 hr
May 8, 9:29 PM CDT	Mesoscale Discussion	SPC	Andrew, Bates, Buchanan, Caldwell, Cass, Clay and 11 more	61 min

Nearby

Mesoscale Discussions in Illinois, 2014 Mesoscale Discussions in Indiana, 2014 Mesoscale Discussions in Kentucky, 2014 Every mesoscale discussion in 2014

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.