Alert archive / Illinois / Mesoscale Discussions in 2018

Mesoscale Discussion 882

June 25, 20184 states

The Storm Prediction Center issued this mesoscale discussion at Jun 25, 2018, 8:08 PM CDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Jun 25, 2018, 8:08 PM CDT (01:08 UTC)
Expired
Jun 25, 2018, 10:15 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
Chance of a watch
40%
All 58 counties

Alexander County, IL, Clinton 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, Madison County, IL, Marion County, IL, Massac County, IL, Monroe County, IL, Perry County, IL, Pope County, IL, Pulaski County, IL, Randolph County, IL, Saint Clair County, IL, Saline County, IL, Union County, IL, Washington County, IL, Wayne County, IL, White County, IL, Williamson County, IL, Posey County, IN, Vanderburgh County, IN, Ballard County, KY, Caldwell County, KY, Calloway County, KY, Carlisle County, KY, Crittenden County, KY, Daviess 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, Trigg County, KY, Union County, KY, Webster County, KY, Bollinger County, MO, Cape Girardeau County, MO, City of Saint Louis, MO, Franklin County, MO, Jefferson County, MO, Mississippi County, MO, Perry County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Scott County, MO, Washington County, MO

The radar

The Paducah radar (KPAH), 91 km from the middle of the area, began a volume at 01:08 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 00:00Z, 1.1 hours before the alert went out and 261 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 00:00Z on 2018-06-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 216 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 00:00Z on 2018-06-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 50 square meters per square second.1939Sfc1 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
216 J/kg
Mixed-layer CIN
-99 J/kg
Mixed-layer LCL
1020 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
50 m²/s²
0-3 km storm-relative helicity
185 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.6

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 26, 2:19 AM CDTMesoscale DiscussionSPCMonroe116 min
Jun 26, 7:39 AM CDTMesoscale DiscussionSPCAlexander, Bond, Christian, Clark, Clay, Clinton and 39 more2 hr
Jun 26, 9:26 AM CDTSevere Thunderstorm WatchSPCEdwards, Gallatin, Hardin, Massac, Pope, Saline and 2 more5 hr
Jun 26, 1:31 PM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, DeKalb, Jo Daviess, Kane and 5 more89 min
Jun 26, 1:53 PM CDTMesoscale DiscussionSPCAlexander, Franklin, Jackson, Johnson, Perry, Pulaski and 3 more67 min
Jun 26, 2:22 PM CDTSevere Thunderstorm WatchSPCAlexander, Franklin, Gallatin, Hardin, Jackson, Johnson and 10 more6 hr
Jun 26, 11:08 AM CDTMesoscale DiscussionSPCPerry, Spencer67 min
Jun 26, 12:18 PM CDTMesoscale DiscussionSPCDearborn87 min
Jun 26, 1:43 PM CDTMesoscale DiscussionSPCMcCreary, Wayne62 min
Jun 26, 5:26 PM CDTSevere Thunderstorm WatchSPCBallard, Caldwell, Calloway, Carlisle, Christian, Crittenden and 16 more6 hr
Jun 26, 12:16 PM CDTMesoscale DiscussionSPCBarton, Bates, Benton, Cass, Cedar, Dade and 10 more59 min
Jun 26, 12:35 PM CDTSevere Thunderstorm WatchSPCBarton, Bates, Benton, Camden, Carroll, Cass and 31 more7 hr
Jun 26, 12:56 PM CDTMesoscale DiscussionSPCBarry, McDonald, Newton, Stone64 min
Jun 26, 1:26 PM CDTSevere Thunderstorm WatchSPCBarry, Christian, Douglas, Jasper, Lawrence, McDonald and 4 more6 hr
Jun 26, 2:46 PM CDTMesoscale DiscussionSPCBarry, Barton, Bates, Benton, Camden, Cass and 29 more89 min
Jun 26, 6:49 PM CDTMesoscale DiscussionSPCHowell, Oregon, Ozark, Ripley116 min

Nearby

Mesoscale Discussions in Illinois, 2018Mesoscale Discussions in Kentucky, 2018Mesoscale Discussions in Missouri, 2018Every mesoscale discussion in 2018

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.