Alert archive / Illinois / Mesoscale Discussions in 2014

Mesoscale Discussion 1208

June 30, 20144 states

The Storm Prediction Center issued this mesoscale discussion at Jun 30, 2014, 1:41 AM CDT for 4 states. It was in force for 64 min.

The area

The outline as issued.

The facts

Issued
Jun 30, 2014, 1:41 AM CDT (06:41 UTC)
Expired
Jun 30, 2014, 2:45 AM CDT
In force
64 min
Issued by
the Storm Prediction Center
All 25 counties

Bureau County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Grundy 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, McHenry County, IL, Putnam County, IL, Stark County, IL, Will County, IL, Lake County, IN, Porter County, IN, Allegan County, MI, Muskegon County, MI, Ottawa County, MI, Kenosha County, WI, Milwaukee County, WI, Racine County, WI

The radar

The Chicago radar (KLOT), 58 km from the middle of the area, began a volume at 06:43 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, 6.7 hours before the alert went out and 225 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 2014-06-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2243 joules per kilogram.LCLEL10008507005003002001001 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 2014-06-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 79 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
2243 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
802 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
79 m²/s²
0-3 km storm-relative helicity
93 m²/s²
Significant tornado parameter
0.8
Supercell composite
6.3

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 29, 8:15 PM CDTSevere Thunderstorm WatchSPCCarroll, Jo Daviess, Rock Island, Stephenson, Whiteside7 hr
Jun 29, 9:43 PM CDTMesoscale DiscussionSPCCarroll, Jo Daviess, Stephenson92 min
Jun 29, 10:54 PM CDTTornado WatchSPCBoone, Carroll, DeKalb, Jo Daviess, Kane, Lee and 5 more5 hr
Jun 30, 10:18 AM CDTMesoscale DiscussionSPCChristian, Logan, Macon, Mason, Menard, Montgomery and 5 more87 min
Jun 30, 1:27 PM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, Champaign, DeKalb, DeWitt and 36 more93 min
Jun 30, 2:03 PM CDTTornado WatchSPCBoone, Bureau, Carroll, DeKalb, Fulton, Hancock and 22 more5 hr
Jun 30, 3:25 PM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, Cook, DeKalb, DuPage and 35 more35 min
Jun 30, 3:33 PM CDTSevere Thunderstorm Watch PDSSPCCook, DuPage, Ford, Grundy, Iroquois, Kane and 6 more7 hr
Jun 30, 4:33 PM CDTMesoscale DiscussionSPCBoone, Cook, DeKalb, DuPage, Kane, Kendall and 6 more117 min
Jun 30, 5:29 PM CDTTornado WatchSPCAdams, Brown, Pike6 hr
Jun 30, 6:08 PM CDTMesoscale DiscussionSPCDeWitt, LaSalle, McLean, Marshall, Peoria, Putnam and 3 more67 min
Jun 30, 6:28 PM CDTMesoscale DiscussionSPCJo Daviess, Rock Island92 min
Jun 29, 7:48 PM CDTMesoscale DiscussionSPCBaraga, Gogebic, Houghton, Iron, Marquette, Ontonagon87 min
Jun 30, 6:47 PM CDTMesoscale DiscussionSPCAllegan, Barry, Clare, Clinton, Crawford, Gladwin and 21 more88 min
Jun 29, 7:50 PM CDTMesoscale DiscussionSPCCrawford, Grant85 min

Nearby

Mesoscale Discussions in Illinois, 2014Mesoscale Discussions in Michigan, 2014Mesoscale Discussions in Wisconsin, 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.