Alert archive / Illinois / Mesoscale Discussions in 2015

Mesoscale Discussion 1175

June 25, 20154 states

The Storm Prediction Center issued this mesoscale discussion at Jun 25, 2015, 3:55 PM CDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Jun 25, 2015, 3:55 PM CDT (20:55 UTC)
Expired
Jun 25, 2015, 6:00 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
Chance of a watch
60%
All 73 counties

Adams County, IL, Bond County, IL, Brown County, IL, Calhoun County, IL, Christian 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, Greene County, IL, Hamilton County, IL, Jasper County, IL, Jefferson County, IL, Jersey County, IL, Lawrence County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Montgomery County, IL, Morgan County, IL, Pike County, IL, Richland County, IL, Saint Clair County, IL, Sangamon County, IL, Scott County, IL, Shelby County, IL, Wabash County, IL, Washington County, IL, Wayne County, IL, White County, IL, Clark County, IN, Crawford County, IN, Daviess County, IN, Dubois County, IN, Floyd County, IN, Gibson County, IN, Greene County, IN, Harrison County, IN, Jackson County, IN, Jefferson County, IN, Knox County, IN, Lawrence County, IN, Martin County, IN, Orange County, IN, Perry County, IN, Pike County, IN, Posey County, IN, Scott County, IN, Spencer County, IN, Sullivan County, IN, Vanderburgh County, IN, Warrick County, IN, Washington County, IN, Bullitt County, KY, Hancock County, KY, Henderson County, KY, Jefferson County, KY, Meade County, KY, Oldham County, KY, Shelby County, KY, Trimble County, KY, City of Saint Louis, MO, Lincoln County, MO, Marion County, MO, Pike County, MO, Ralls County, MO, Saint Charles County, MO, Saint Louis County, MO, Warren County, MO

The radar

The Lincoln radar (KILX), 126 km from the middle of the area, began a volume at 20:53 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.

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 8.9 hours before the alert went out and 127 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-pSkew-T log-p diagram, Lincoln, IL at 12:00Z on 2015-06-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 12:00Z on 2015-06-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 187 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
2 J/kg
Mixed-layer CIN
-330 J/kg
Mixed-layer LCL
1898 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
187 m²/s²
0-3 km storm-relative helicity
237 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.

IssuedProductOfficeCountiesLasted
Jun 24, 9:26 PM CDTSevere Thunderstorm WatchSPCAdams, Brown, Bureau, Carroll, Cass, Fulton and 22 more6 hr
Jun 24, 11:23 PM CDTMesoscale DiscussionSPCAdams, Brown, Calhoun, Cass, Fulton, Greene and 10 more2 hr
Jun 25, 2:02 AM CDTMesoscale DiscussionSPCAdams, Brown, Calhoun, Cass, Christian, DeWitt and 16 more118 min
Jun 25, 4:53 PM CDTSevere Thunderstorm WatchSPCBond, Calhoun, Christian, Clay, Clinton, Crawford and 32 more9 hr
Jun 25, 7:26 AM CDTMesoscale DiscussionSPCBartholomew, Clark, Crawford, Dearborn, Dubois, Floyd and 13 more2 hr
Jun 25, 5:23 PM CDTMesoscale DiscussionSPCAdair, Anderson, Bath, Bourbon, Boyd, Boyle and 51 more97 min
Jun 25, 6:30 PM CDTSevere Thunderstorm WatchSPCAdair, Anderson, Bell, Boyle, Breathitt, Casey and 43 more8 hr
Jun 24, 7:49 PM CDTMesoscale DiscussionSPCAdair, Clark, Grundy, Harrison, Knox, Mercer and 5 more116 min
Jun 24, 10:00 PM CDTMesoscale DiscussionSPCPutnam, Schuyler, Scotland2 hr
Jun 25, 4:52 PM CDTMesoscale DiscussionSPCCarroll, Cass, Chariton, Clay, Cooper, Henry and 9 more113 min
Jun 25, 5:53 PM CDTSevere Thunderstorm WatchSPCAndrew, Buchanan, Caldwell, Carroll, Chariton, Clay and 17 more9 hr

Nearby

Mesoscale Discussions in Illinois, 2015Mesoscale Discussions in Indiana, 2015Mesoscale Discussions in Kentucky, 2015Every 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.