Alert archive / Illinois / Mesoscale Discussions in 2014

Mesoscale Discussion 1295

July 7, 201427 counties in Illinois; 15 counties in Indiana; 4 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Jul 7, 2014, 1:45 PM CDT for 27 counties in Illinois; 15 counties in Indiana; 4 counties in Missouri. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued: Jul 7, 2014, 1:45 PM CDT (18:45 UTC)
Expired: Jul 7, 2014, 3:15 PM CDT
In force: 90 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

All 46 counties

Bond County, IL, Clark County, IL, Clay County, IL, Clinton County, IL, Crawford County, IL, Cumberland County, IL, Edwards County, IL, Effingham County, IL, Fayette County, IL, Franklin County, IL, Hamilton County, IL, Jasper County, IL, Jefferson County, IL, Jersey County, IL, Lawrence County, IL, Madison County, IL, Marion County, IL, Monroe County, IL, Montgomery County, IL, Perry County, IL, Randolph County, IL, Richland County, IL, Saint Clair County, IL, Wabash County, IL, Washington County, IL, Wayne County, IL, White County, IL, Clay County, IN, Daviess County, IN, Dubois County, IN, Gibson County, IN, Greene County, IN, Knox County, IN, Martin County, IN, Monroe County, IN, Owen County, IN, Pike County, IN, Posey County, IN, Sullivan County, IN, Vanderburgh County, IN, Vigo County, IN, Warrick County, IN, City of Saint Louis, MO, Jefferson County, MO, Saint Charles County, MO, Saint Louis County, MO

The radar

The Evansville,IN radar (KVWX), 115 km from the middle of the area, began a volume at 18:49 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, 6.8 hours before the alert went out and 166 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: 1670 J/kg
Mixed-layer CIN: -91 J/kg
Mixed-layer LCL: 689 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 140 m²/s²
0-3 km storm-relative helicity: 240 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.8

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 6, 11:11 PM CDT	Mesoscale Discussion	SPC	Boone, Cook, DeKalb, DuPage, Kane, Lake and 3 more	64 min
Jul 7, 6:01 PM CDT	Mesoscale Discussion	SPC	Monroe	59 min
Jul 7, 12:18 PM CDT	Mesoscale Discussion	SPC	Brown, Clay, Fayette, Franklin, Hamilton, Hancock and 14 more	87 min
Jul 7, 6:17 PM CDT	Mesoscale Discussion	SPC	Harrison, Perry	58 min
Jul 7, 5:39 PM CDT	Severe Thunderstorm Watch	SPC	Atchison, Holt, Nodaway	7 hr

Nearby

Mesoscale Discussions in Illinois, 2014 Mesoscale Discussions in Indiana, 2014 Mesoscale Discussions in Missouri, 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.