Alert archive / Illinois / Mesoscale Discussions in 2014

Mesoscale Discussion 1222

June 30, 20149 counties in Illinois

The Storm Prediction Center issued this mesoscale discussion at Jun 30, 2014, 6:08 PM CDT for 9 counties in Illinois. It was in force for 67 min.

The area

The outline as issued.

The facts

Issued: Jun 30, 2014, 6:08 PM CDT (23:08 UTC)
Expired: Jun 30, 2014, 7:15 PM CDT
In force: 67 min
Issued by: the Storm Prediction Center

Counties DeWitt County, IL, LaSalle County, IL, Marshall County, IL, McLean County, IL, Peoria County, IL, Putnam County, IL, Stark County, IL, Tazewell County, IL, Woodford County, IL

The radar

The Lincoln radar (KILX), 71 km from the middle of the area, began a volume at 23:09 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 380Jun 30, 9:00 PM CDT

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 11.1 hours before the alert went out and 131 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: 1426 J/kg
Mixed-layer CIN: -49 J/kg
Mixed-layer LCL: 544 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 253 m²/s²
0-3 km storm-relative helicity: 262 m²/s²
Significant tornado parameter: 2.3
Supercell composite: 15.0

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.

Issued	Product	Office	Counties	Lasted
Jun 29, 8:15 PM CDT	Severe Thunderstorm Watch	SPC	Carroll, Jo Daviess, Rock Island, Stephenson, Whiteside	7 hr
Jun 29, 9:43 PM CDT	Mesoscale Discussion	SPC	Carroll, Jo Daviess, Stephenson	92 min
Jun 29, 10:54 PM CDT	Tornado Watch	SPC	Boone, Carroll, DeKalb, Jo Daviess, Kane, Lee and 5 more	5 hr
Jun 30, 1:41 AM CDT	Mesoscale Discussion	SPC	Bureau, Cook, DeKalb, DuPage, Grundy, Kane and 11 more	64 min
Jun 30, 10:18 AM CDT	Mesoscale Discussion	SPC	Christian, Logan, Macon, Mason, Menard, Montgomery and 5 more	87 min
Jun 30, 1:27 PM CDT	Mesoscale Discussion	SPC	Boone, Bureau, Carroll, Champaign, DeKalb, DeWitt and 36 more	93 min
Jun 30, 2:03 PM CDT	Tornado Watch	SPC	Boone, Bureau, Carroll, DeKalb, Fulton, Hancock and 22 more	5 hr
Jun 30, 3:25 PM CDT	Mesoscale Discussion	SPC	Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 35 more	35 min
Jun 30, 3:33 PM CDT	Severe Thunderstorm Watch PDS	SPC	Cook, DuPage, Ford, Grundy, Iroquois, Kane and 6 more	7 hr
Jun 30, 4:33 PM CDT	Mesoscale Discussion	SPC	Boone, Cook, DeKalb, DuPage, Kane, Kendall and 6 more	117 min
Jun 30, 5:29 PM CDT	Tornado Watch	SPC	Adams, Brown, Pike	6 hr
Jun 30, 6:28 PM CDT	Mesoscale Discussion	SPC	Jo Daviess, Rock Island	92 min

Nearby

Mesoscale Discussions in Illinois, 2014 Every 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.