Alert archive / Illinois / Mesoscale Discussions in 2019

Mesoscale Discussion 207

March 14, 201923 counties in Illinois; Lake County, Newton County, Indiana

The Storm Prediction Center issued this mesoscale discussion at Mar 14, 2019, 10:54 AM CDT for 23 counties in Illinois; Lake County, Newton County, Indiana. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued: Mar 14, 2019, 10:54 AM CDT (15:54 UTC)
Expired: Mar 14, 2019, 12:30 PM CDT
In force: 96 min
Issued by: the Storm Prediction Center
Chance of a watch: 60%

All 25 counties

DeWitt County, IL, DuPage County, IL, Ford County, IL, Fulton County, IL, Grundy County, IL, Iroquois County, IL, Kankakee County, IL, Kendall County, IL, LaSalle County, IL, Livingston County, IL, Logan County, IL, Macon County, IL, Marshall County, IL, Mason County, IL, McLean County, IL, Menard County, IL, Peoria County, IL, Putnam County, IL, Sangamon County, IL, Stark County, IL, Tazewell County, IL, Will County, IL, Woodford County, IL, Lake County, IN, Newton County, IN

The radar

The Lincoln radar (KILX), 75 km from the middle of the area, began a volume at 15:53 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Tornado Watch 26Mar 14, 12:20 PM CDT

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 3.9 hours before the alert went out and 77 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: 86 J/kg
Mixed-layer CIN: -267 J/kg
Mixed-layer LCL: 1140 m above ground
0-6 km bulk shear: 0 kt
0-1 km storm-relative helicity: 0 m²/s²
0-3 km storm-relative helicity: 0 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
Mar 14, 9:31 AM CDT	Mesoscale Discussion	SPC	Edwards, Gallatin, Hardin, Massac, Pope, Saline and 2 more	119 min
Mar 14, 9:47 AM CDT	Tornado Watch	SPC	Gallatin, Hardin, Massac, Pope, Wabash	6 hr
Mar 14, 12:24 PM CDT	Tornado Watch	SPC	Boone, Champaign, Cook, DeKalb, DeWitt, DuPage and 14 more	2 hr
Mar 14, 2:37 AM CDT	Mesoscale Discussion	SPC	Dubois, Gibson, Knox, Pike, Posey, Spencer and 2 more	83 min
Mar 14, 12:38 PM CDT	Mesoscale Discussion	SPC	Crawford, Perry, Spencer	67 min
Mar 14, 1:51 PM CDT	Mesoscale Discussion	SPC	Elkhart, LaPorte, Marshall, Saint Joseph, Starke	54 min
Mar 14, 4:03 PM CDT	Severe Thunderstorm Watch	SPC	Clark, Dearborn, Floyd, Franklin, Harrison, Jefferson and 4 more	5 hr
Mar 14, 5:08 PM CDT	Severe Thunderstorm Watch	SPC	Allen, DeKalb, LaGrange, Noble, Steuben, Whitley	4 hr

Nearby

Mesoscale Discussions in Illinois, 2019 Mesoscale Discussions in Indiana, 2019 Every mesoscale discussion in 2019

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.