Alert archive / Indiana / Mesoscale Discussions in 2020

Mesoscale Discussion 1276

July 19, 2020Ford County, Iroquois County, Illinois; 26 counties in Indiana; 4 counties in Michigan

The Storm Prediction Center issued this mesoscale discussion at Jul 19, 2020, 12:19 PM CDT for Ford County, Iroquois County, Illinois; 26 counties in Indiana; 4 counties in Michigan. It was in force for 86 min.

The area

The outline as issued.

The facts

Issued: Jul 19, 2020, 12:19 PM CDT (17:19 UTC)
Expired: Jul 19, 2020, 1:45 PM CDT
In force: 86 min
Issued by: the Storm Prediction Center
Concerning: Severe thunderstorm watch 384

All 32 counties

Ford County, IL, Iroquois County, IL, Benton County, IN, Carroll County, IN, Cass County, IN, DeKalb County, IN, Elkhart County, IN, Fulton County, IN, Howard County, IN, Jasper County, IN, Kosciusko County, IN, LaGrange County, IN, Lake County, IN, LaPorte County, IN, Marshall County, IN, Miami County, IN, Newton County, IN, Noble County, IN, Porter County, IN, Pulaski County, IN, Saint Joseph County, IN, Starke County, IN, Steuben County, IN, Tippecanoe County, IN, Wabash County, IN, Warren County, IN, White County, IN, Whitley County, IN, Berrien County, MI, Branch County, MI, Cass County, MI, Saint Joseph County, MI

The radar

The Chicago radar (KLOT), 98 km from the middle of the area, began a volume at 17:18 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, 5.3 hours before the alert went out and 183 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 930 J/kg
Mixed-layer CIN: -192 J/kg
Mixed-layer LCL: 1208 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 207 m²/s²
0-3 km storm-relative helicity: 217 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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.

Issued	Product	Office	Counties	Lasted
Jul 19, 10:12 AM CDT	Mesoscale Discussion	SPC	Bureau, Cook, DeKalb, DuPage, Ford, Grundy and 14 more	93 min
Jul 19, 10:32 AM CDT	Severe Thunderstorm Watch	SPC	Cook, DuPage, Ford, Grundy, Iroquois, Kankakee and 3 more	5 hr
Jul 19, 3:00 PM CDT	Mesoscale Discussion	SPC	Calhoun	2 hr
Jul 19, 2:10 PM CDT	Mesoscale Discussion	SPC	Adams, Allen, Blackford, DeKalb, Jay, Steuben and 1 more	2 hr
Jul 18, 8:36 PM CDT	Mesoscale Discussion	SPC	Baraga, Dickinson, Gogebic, Houghton, Iron, Keweenaw and 2 more	114 min
Jul 18, 9:44 PM CDT	Severe Thunderstorm Watch	SPC	Alger, Baraga, Delta, Dickinson, Gogebic, Houghton and 6 more	7 hr
Jul 19, 1:13 AM CDT	Mesoscale Discussion	SPC	Alger, Baraga, Delta, Dickinson, Iron, Marquette and 2 more	92 min
Jul 19, 3:22 AM CDT	Mesoscale Discussion	SPC	Alpena, Antrim, Benzie, Charlevoix, Cheboygan, Clare and 15 more	83 min
Jul 19, 7:42 AM CDT	Mesoscale Discussion	SPC	Arenac, Barry, Bay, Branch, Calhoun, Clinton and 27 more	2 hr

Nearby

Mesoscale Discussions in Indiana, 2020 Mesoscale Discussions in Michigan, 2020 Mesoscale Discussions in Illinois, 2020 Every mesoscale discussion in 2020

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.