Alert archive / Illinois / Mesoscale Discussions in 2016

Mesoscale Discussion 136

February 24, 201615 counties in Illinois; 12 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Feb 24, 2016, 2:37 AM CST for 15 counties in Illinois; 12 counties in Missouri. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: Feb 24, 2016, 2:37 AM CST (08:37 UTC)
Expired: Feb 24, 2016, 7:30 AM CST
In force: 5 hr
Issued by: the Storm Prediction Center

All 27 counties

Bond County, IL, Christian County, IL, Clinton County, IL, Effingham County, IL, Fayette County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Monroe County, IL, Montgomery County, IL, Moultrie County, IL, Randolph County, IL, Saint Clair County, IL, Shelby County, IL, Washington County, IL, Carter County, MO, City of Saint Louis, MO, Iron County, MO, Jefferson County, MO, Madison County, MO, Perry County, MO, Reynolds County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Shannon County, MO, Washington County, MO

The radar

The St Louis radar (KLSX), 59 km from the middle of the area, began a volume at 08:41 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

Lincoln, IL (KILX), launched 00:00Z, 8.6 hours before the alert went out and 226 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1596 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 7 m²/s²
0-3 km storm-relative helicity: 56 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
Feb 24, 6:34 AM CST	Mesoscale Discussion	SPC	Champaign, DeWitt, Ford, Iroquois, Kankakee, McLean and 2 more	5 hr

Nearby

Mesoscale Discussions in Illinois, 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.