Alert archive / Missouri / Mesoscale Discussions in 2015

Mesoscale Discussion 1127

June 22, 20154 counties in Illinois; 14 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Jun 22, 2015, 9:41 PM CDT for 4 counties in Illinois; 14 counties in Missouri. It was in force for 64 min.

The area

The outline as issued.

The facts

Issued: Jun 22, 2015, 9:41 PM CDT (02:41 UTC)
Expired: Jun 22, 2015, 10:45 PM CDT
In force: 64 min
Issued by: the Storm Prediction Center

Counties Adams County, IL, Brown County, IL, Pike County, IL, Scott County, IL, Adair County, MO, Audrain County, MO, Chariton County, MO, Knox County, MO, Lewis County, MO, Linn County, MO, Livingston County, MO, Macon County, MO, Marion County, MO, Monroe County, MO, Pike County, MO, Ralls County, MO, Randolph County, MO, Shelby County, MO

The radar

The St Louis radar (KLSX), 152 km from the middle of the area, began a volume at 02:42 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

Davenport, (KDVN), launched 00:00Z, 2.7 hours before the alert went out and 239 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: 1958 J/kg
Mixed-layer CIN: -19 J/kg
Mixed-layer LCL: 925 m above ground
0-6 km bulk shear: 61 kt
0-1 km storm-relative helicity: 401 m²/s²
0-3 km storm-relative helicity: 441 m²/s²
Significant tornado parameter: 5.7
Supercell composite: 17.5

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 22, 7:31 PM CDT	Mesoscale Discussion	SPC	Cook, Lake	59 min
Jun 22, 7:34 PM CDT	Mesoscale Discussion	SPC	Adams, Brown, Hancock, Pike, Schuyler	56 min
Jun 22, 7:57 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Brown, Calhoun, Pike	4 hr
Jun 22, 8:16 PM CDT	Mesoscale Discussion	SPC	Bureau, DeWitt, Fulton, Grundy, Hancock, Henderson and 21 more	59 min
Jun 22, 8:17 PM CDT	Tornado Watch	SPC	Iroquois, Kankakee, Will	6 hr
Jun 22, 10:00 PM CDT	Mesoscale Discussion	SPC	Champaign, Cook, Douglas, Ford, Iroquois, Kankakee and 2 more	60 min
Jun 23, 10:40 AM CDT	Mesoscale Discussion	SPC	Atchison, Holt, Nodaway	95 min

Nearby

Mesoscale Discussions in Missouri, 2015 Mesoscale Discussions in Illinois, 2015 Every mesoscale discussion in 2015

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.