Alert archive / Missouri / Mesoscale Discussions in 2015

Mesoscale Discussion 1568

July 29, 20155 counties in Illinois; 13 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Jul 29, 2015, 1:31 AM CDT for 5 counties in Illinois; 13 counties in Missouri. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jul 29, 2015, 1:31 AM CDT (06:31 UTC)
Expired: Jul 29, 2015, 4:00 AM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 20%

Counties Adams County, IL, Brown County, IL, Pike County, IL, Schuyler County, IL, Scott County, IL, Adair County, MO, Audrain County, MO, Chariton County, MO, Knox County, MO, Lewis County, MO, Lincoln 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), 180 km from the middle of the area, began a volume at 06:33 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, 6.5 hours before the alert went out and 246 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: 1806 J/kg
Mixed-layer CIN: -40 J/kg
Mixed-layer LCL: 1061 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 115 m²/s²
0-3 km storm-relative helicity: 180 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 6.7

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
Jul 29, 3:27 PM CDT	Mesoscale Discussion	SPC	Alexander, Gallatin, Hardin, Johnson, Massac, Pope and 4 more	93 min
Jul 28, 8:04 PM CDT	Mesoscale Discussion	SPC	Andrew, Atchison, Buchanan, Daviess, DeKalb, Gentry and 9 more	116 min
Jul 28, 10:46 PM CDT	Mesoscale Discussion	SPC	Adair, Andrew, Clark, Gentry, Grundy, Harrison and 8 more	89 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.