Alert archive / Illinois / Mesoscale Discussions in 2014

Mesoscale Discussion 1470

July 26, 201444 counties in Illinois; 10 counties in Indiana

The Storm Prediction Center issued this mesoscale discussion at Jul 26, 2014, 3:20 PM CDT for 44 counties in Illinois; 10 counties in Indiana. It was in force for 115 min.

The area

The outline as issued.

The facts

Issued: Jul 26, 2014, 3:20 PM CDT (20:20 UTC)
Expired: Jul 26, 2014, 5:15 PM CDT
In force: 115 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

All 54 counties

Bond County, IL, Brown County, IL, Cass County, IL, Christian 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, Greene County, IL, Hamilton County, IL, Jackson County, IL, Jasper County, IL, Jefferson County, IL, Lawrence County, IL, Macon County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Menard County, IL, Montgomery County, IL, Morgan County, IL, Moultrie County, IL, Perry County, IL, Piatt County, IL, Randolph County, IL, Richland County, IL, Saint Clair County, IL, Saline County, IL, Sangamon County, IL, Scott County, IL, Shelby County, IL, Wabash County, IL, Washington County, IL, Wayne County, IL, White County, IL, Williamson County, IL, Clay County, IN, Daviess County, IN, Gibson County, IN, Greene County, IN, Knox County, IN, Owen County, IN, Pike County, IN, Posey County, IN, Sullivan County, IN, Vigo County, IN

The radar

The Evansville,IN radar (KVWX), 105 km from the middle of the area, began a volume at 20:23 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 443Jul 26, 5:40 PM CDT

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 8.3 hours before the alert went out and 146 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: 1417 J/kg
Mixed-layer CIN: -292 J/kg
Mixed-layer LCL: 806 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 236 m²/s²
0-3 km storm-relative helicity: 323 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 8.8

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 26, 5:40 PM CDT	Severe Thunderstorm Watch	SPC	Clark, Clay, Crawford, Cumberland, Edwards, Effingham and 11 more	5 hr
Jul 26, 1:41 PM CDT	Mesoscale Discussion	SPC	Adams, Allen, Blackford, DeKalb, Huntington, Jay and 6 more	64 min
Jul 26, 2:29 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Allen, Huntington, Jay, Wells, Whitley	3 hr

Nearby

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