Alert archive / Illinois / Mesoscale Discussions in 2015

Mesoscale Discussion 1332

July 8, 20154 states

The Storm Prediction Center issued this mesoscale discussion at Jul 8, 2015, 9:01 PM CDT for 4 states. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued: Jul 8, 2015, 9:01 PM CDT (02:01 UTC)
Expired: Jul 8, 2015, 10:30 PM CDT
In force: 89 min
Issued by: the Storm Prediction Center

All 51 counties

Alexander County, IL, Clay 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, 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, Wabash County, IL, Washington County, IL, Wayne County, IL, White County, IL, Williamson County, IL, Gibson County, IN, Knox County, IN, Pike County, IN, Posey County, IN, Vanderburgh County, IN, Warrick County, IN, Ballard County, KY, Crittenden County, KY, Daviess County, KY, Henderson County, KY, Union County, KY, Webster County, KY, Bollinger County, MO, Butler County, MO, Cape Girardeau County, MO, Carter County, MO, Iron County, MO, Madison County, MO, Perry County, MO, Reynolds County, MO, Ripley County, MO, Saint Francois County, MO, Sainte Genevieve County, MO, Scott County, MO, Stoddard County, MO, Wayne County, MO

The radar

The Paducah radar (KPAH), 58 km from the middle of the area, began a volume at 02:04 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 nearest sounding before it

Nashville Metro, TN (KBNA), launched 00:00Z, 2.0 hours before the alert went out and 274 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: 226 J/kg
Mixed-layer CIN: -20 J/kg
Mixed-layer LCL: 1730 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 33 m²/s²
0-3 km storm-relative helicity: 170 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
Jul 9, 6:10 PM CDT	Mesoscale Discussion	SPC	Alexander, Gallatin, Hardin, Johnson, Massac, Pope and 4 more	2 hr
Jul 8, 11:40 PM CDT	Mesoscale Discussion	SPC	Perry, Spencer, Vanderburgh, Warrick	65 min
Jul 9, 4:11 AM CDT	Mesoscale Discussion	SPC	Adair, Barren, Boyle, Butler, Casey, Christian and 19 more	3 hr
Jul 9, 11:15 AM CDT	Mesoscale Discussion	SPC	Adair, Allen, Barren, Bell, Boyle, Breathitt and 37 more	3 hr
Jul 9, 4:58 PM CDT	Mesoscale Discussion	SPC	Breathitt, Clay, Floyd, Harlan, Jackson, Knott and 9 more	2 hr
Jul 8, 7:00 PM CDT	Mesoscale Discussion	SPC	Dunklin, Pemiscot	2 hr
Jul 9, 3:26 PM CDT	Mesoscale Discussion	SPC	Barry, Bollinger, Butler, Carter, Christian, Douglas and 14 more	2 hr

Nearby

Mesoscale Discussions in Illinois, 2015 Mesoscale Discussions in Missouri, 2015 Mesoscale Discussions in Indiana, 2015 Every mesoscale discussion in 2015

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.