Alert archive / Illinois / Mesoscale Discussions in 2014

Mesoscale Discussion 1229

June 30, 201418 counties in Illinois; 5 counties in Indiana; Berrien County, Michigan

The Storm Prediction Center issued this mesoscale discussion at Jun 30, 2014, 8:44 PM CDT for 18 counties in Illinois; 5 counties in Indiana; Berrien County, Michigan. It was in force for 31 min.

The area

The outline as issued.

The facts

Issued
Jun 30, 2014, 8:44 PM CDT (01:44 UTC)
Expired
Jun 30, 2014, 9:15 PM CDT
In force
31 min
Issued by
the Storm Prediction Center
Chance of a watch
95%
All 24 counties

Bureau County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Grundy County, IL, Iroquois County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Lake County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, Marshall County, IL, Putnam County, IL, Stark County, IL, Will County, IL, Woodford County, IL, Jasper County, IN, Lake County, IN, LaPorte County, IN, Newton County, IN, Porter County, IN, Berrien County, MI

The radar

The Chicago radar (KLOT), 15 km from the middle of the area, began a volume at 01:45 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 00:00Z, 1.7 hours before the alert went out and 160 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 2014-07-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3809 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 2014-07-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 282 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
3809 J/kg
Mixed-layer CIN
-77 J/kg
Mixed-layer LCL
981 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
282 m²/s²
0-3 km storm-relative helicity
304 m²/s²
Significant tornado parameter
3.4
Supercell composite
27.2

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 30, 7:26 PM CDTMesoscale DiscussionSPCBureau, Fulton, Hancock, Henderson, Henry, Knox and 13 more2 hr
Jun 30, 7:47 PM CDTMesoscale DiscussionSPCKankakee88 min
Jun 30, 7:48 PM CDTMesoscale DiscussionSPCHancock57 min
Jun 30, 9:01 PM CDTSevere Thunderstorm WatchSPCCass, Champaign, Cook, DeWitt, Douglas, DuPage and 31 more6 hr
Jun 30, 9:47 PM CDTMesoscale DiscussionSPCDuPage, Ford, Grundy, Iroquois, Kankakee, Kendall and 9 more88 min
Jun 30, 10:11 PM CDTMesoscale DiscussionSPCChampaign, Douglas, Edgar, Moultrie, Piatt, Vermilion2 hr
Jun 30, 10:14 PM CDTMesoscale DiscussionSPCAdams61 min
Jun 30, 10:22 PM CDTMesoscale DiscussionSPCKankakee, Will53 min
Jun 30, 11:31 PM CDTMesoscale DiscussionSPCChampaign, DeWitt, Logan, Macon, Menard, Piatt and 2 more89 min
Jul 1, 1:31 PM CDTMesoscale DiscussionSPCAlexander, Franklin, Jackson, Johnson, Massac, Perry and 5 more59 min
Jul 1, 2:07 PM CDTSevere Thunderstorm WatchSPCAlexander, Clinton, Edwards, Franklin, Gallatin, Hamilton and 19 more7 hr
Jul 1, 6:13 PM CDTMesoscale DiscussionSPCMassac92 min
Jun 30, 9:06 PM CDTMesoscale DiscussionSPCElkhart, Saint Joseph84 min
Jun 30, 10:35 PM CDTSevere Thunderstorm WatchSPCAdams, Allen, Blackford, Carroll, Cass, Clinton and 24 more4 hr
Jul 1, 12:24 AM CDTMesoscale DiscussionSPCAdams, Allen, DeKalb, Huntington, Jay, LaGrange and 4 more66 min
Jul 1, 1:56 AM CDTMesoscale DiscussionSPCBartholomew, Dearborn, Decatur, Fayette, Franklin, Henry and 11 more64 min
Jul 1, 4:43 PM CDTMesoscale DiscussionSPCClark, Crawford, Dearborn, Floyd, Franklin, Harrison and 10 more92 min
Jun 30, 7:23 PM CDTSevere Thunderstorm WatchSPCAllegan, Arenac, Barry, Calhoun, Clare, Clinton and 25 more7 hr
Jul 1, 12:44 AM CDTSevere Thunderstorm WatchSPCHillsdale, Lenawee, Livingston, Macomb, Monroe, Oakland and 3 more4 hr
Jul 1, 3:05 AM CDTMesoscale DiscussionSPCMacomb, Saint Clair55 min

Nearby

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