Alert archive / Illinois / Mesoscale Discussions in 2007

Mesoscale Discussion 887

May 25, 200723 counties in Illinois; 4 counties in Indiana; 18 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at May 25, 2007, 12:33 PM CDT for 23 counties in Illinois; 4 counties in Indiana; 18 counties in Missouri. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: May 25, 2007, 12:33 PM CDT (17:33 UTC)
Expired: May 25, 2007, 3:00 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 45 counties

Bond County, IL, Clark County, IL, Clay County, IL, Clinton County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, Edgar County, IL, Effingham County, IL, Fayette County, IL, Jasper County, IL, Jefferson County, IL, Madison County, IL, Marion County, IL, Monroe County, IL, Montgomery County, IL, Perry County, IL, Randolph County, IL, Richland County, IL, Saint Clair County, IL, Shelby County, IL, Washington County, IL, Wayne County, IL, Parke County, IN, Sullivan County, IN, Vermillion County, IN, Vigo County, IN, City of Saint Louis, MO, Crawford County, MO, Dent County, MO, Douglas County, MO, Franklin County, MO, Iron County, MO, Jefferson County, MO, Laclede County, MO, Maries County, MO, Phelps County, MO, Pulaski County, MO, Reynolds County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Texas County, MO, Washington County, MO, Wright County, MO

The radar

The St Louis radar (KLSX), 57 km from the middle of the area, began a volume at 17:34 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 12:00Z, 5.6 hours before the alert went out and 241 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: 696 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 84 m²/s²
0-3 km storm-relative helicity: 153 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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Nearby

Mesoscale Discussions in Illinois, 2007 Mesoscale Discussions in Missouri, 2007 Mesoscale Discussions in Indiana, 2007 Every mesoscale discussion in 2007

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.