Alert archive / Illinois / Mesoscale Discussions in 2016

Mesoscale Discussion 1310

July 17, 201618 counties in Illinois; 4 counties in Indiana; 4 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Jul 17, 2016, 8:06 PM CDT for 18 counties in Illinois; 4 counties in Indiana; 4 counties in Missouri. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued: Jul 17, 2016, 8:06 PM CDT (01:06 UTC)
Expired: Jul 17, 2016, 9:30 PM CDT
In force: 84 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

All 26 counties

DeWitt County, IL, Ford County, IL, Fulton County, IL, Hancock County, IL, Iroquois County, IL, Kankakee County, IL, Knox County, IL, Livingston County, IL, Marshall County, IL, Mason County, IL, McDonough County, IL, McLean County, IL, Peoria County, IL, Putnam County, IL, Schuyler County, IL, Stark County, IL, Tazewell County, IL, Woodford County, IL, Benton County, IN, Jasper County, IN, Newton County, IN, Warren County, IN, Clark County, MO, Knox County, MO, Lewis County, MO, Scotland County, MO

The radar

The Lincoln radar (KILX), 63 km from the middle of the area, began a volume at 01:08 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.

Severe Thunderstorm Watch 393Jul 17, 9:00 PM CDT

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 1.1 hours before the alert went out and 113 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: 3314 J/kg
Mixed-layer CIN: -37 J/kg
Mixed-layer LCL: 1062 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 197 m²/s²
0-3 km storm-relative helicity: 237 m²/s²
Significant tornado parameter: 3.3
Supercell composite: 26.5

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.

Issued	Product	Office	Counties	Lasted
Jul 17, 9:02 PM CDT	Severe Thunderstorm Watch	SPC	Ford, Grundy, Iroquois, Kankakee, LaSalle, Livingston and 1 more	4 hr
Jul 17, 9:46 PM CDT	Mesoscale Discussion	SPC	Bureau, Ford, Fulton, Grundy, Hancock, Henderson and 18 more	89 min
Jul 17, 11:25 PM CDT	Mesoscale Discussion	SPC	Cook, DuPage, Ford, Grundy, Iroquois, Kankakee and 8 more	95 min
Jul 18, 7:59 AM CDT	Mesoscale Discussion	SPC	Christian, Clark, Coles, Crawford, Cumberland, Effingham and 10 more	91 min
Jul 18, 12:51 AM CDT	Mesoscale Discussion	SPC	Allen, DeKalb, Elkhart, Fulton, Huntington, Kosciusko and 7 more	114 min
Jul 17, 11:40 PM CDT	Mesoscale Discussion	SPC	Andrew, Atchison, Gentry, Harrison, Holt, Nodaway and 1 more	95 min

Nearby

Mesoscale Discussions in Illinois, 2016 Mesoscale Discussions in Indiana, 2016 Mesoscale Discussions in Missouri, 2016 Every mesoscale discussion in 2016

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.