Alert archive / Illinois / Mesoscale Discussions in 2018

Mesoscale Discussion 982

July 1, 20184 states

The Storm Prediction Center issued this mesoscale discussion at Jul 1, 2018, 6:51 PM CDT for 4 states. It was in force for 114 min.

The area

The outline as issued.

The facts

Issued
Jul 1, 2018, 6:51 PM CDT (23:51 UTC)
Expired
Jul 1, 2018, 8:45 PM CDT
In force
114 min
Issued by
the Storm Prediction Center
All 59 counties

Bond County, IL, Champaign County, IL, Christian County, IL, Clark County, IL, Clay County, IL, Clinton County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, DeWitt County, IL, Douglas County, IL, Edgar County, IL, Effingham County, IL, Fayette County, IL, Ford County, IL, Iroquois County, IL, Jasper County, IL, Kankakee County, IL, Macon County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Montgomery County, IL, Moultrie County, IL, Piatt County, IL, Richland County, IL, Shelby County, IL, Vermilion County, IL, Benton County, IN, Carroll County, IN, Cass County, IN, Clay County, IN, Clinton County, IN, Fountain County, IN, Fulton County, IN, Jasper County, IN, Lake County, IN, LaPorte County, IN, Marshall County, IN, Montgomery County, IN, Newton County, IN, Parke County, IN, Porter County, IN, Pulaski County, IN, Putnam County, IN, Saint Joseph County, IN, Starke County, IN, Sullivan County, IN, Tippecanoe County, IN, Vermillion County, IN, Vigo County, IN, Warren County, IN, White County, IN, Allegan County, MI, Berrien County, MI, Cass County, MI, Van Buren County, MI, City of Saint Louis, MO, Saint Louis County, MO

The radar

The Lincoln radar (KILX), 107 km from the middle of the area, began a volume at 23:53 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 nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 11.9 hours before the alert went out and 51 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 2018-07-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1834 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 2018-07-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 123 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
1834 J/kg
Mixed-layer CIN
-58 J/kg
Mixed-layer LCL
867 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
123 m²/s²
0-3 km storm-relative helicity
109 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.5

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
Jul 1, 11:37 AM CDTMesoscale DiscussionSPCBoone, Jo Daviess, McHenry, Stephenson, Winnebago83 min
Jul 1, 12:23 PM CDTMesoscale DiscussionSPCAdams, Bond, Boone, Brown, Bureau, Carroll and 56 more97 min
Jul 1, 12:58 PM CDTSevere Thunderstorm WatchSPCBond, Boone, Bureau, Cass, Champaign, Christian and 49 more7 hr
Jul 1, 3:37 PM CDTMesoscale DiscussionSPCBond, Boone, Cass, Champaign, Christian, Clark and 46 more83 min
Jun 30, 8:05 PM CDTMesoscale DiscussionSPCAlger, Delta, Dickinson, Gogebic, Iron, Menominee85 min
Jul 1, 12:04 PM CDTTornado WatchSPCAlger, Delta, Dickinson, Iron, Luce, Marquette and 2 more6 hr
Jul 1, 1:37 PM CDTMesoscale DiscussionSPCAlger, Baraga, Delta, Dickinson, Iron, Luce and 3 more53 min
Jul 1, 3:18 PM CDTMesoscale DiscussionSPCDelta, Luce, Mackinac, Menominee, Schoolcraft87 min
Jul 1, 5:05 PM CDTMesoscale DiscussionSPCAntrim, Benzie, Charlevoix, Cheboygan, Chippewa, Clare and 16 more2 hr
Jul 1, 5:35 PM CDTSevere Thunderstorm WatchSPCAllegan, Antrim, Barry, Benzie, Charlevoix, Cheboygan and 22 more3 hr
Jun 30, 8:55 PM CDTMesoscale DiscussionSPCAndrew, Atchison, Buchanan, DeKalb, Gentry, Holt and 3 more95 min

Nearby

Mesoscale Discussions in Illinois, 2018Mesoscale Discussions in Indiana, 2018Mesoscale Discussions in Michigan, 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.