Alert archive / Illinois / Mesoscale Discussions in 2007

Mesoscale Discussion 1255

June 22, 200715 counties in Illinois; 5 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Jun 22, 2007, 5:30 PM CDT for 15 counties in Illinois; 5 counties in Missouri. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued: Jun 22, 2007, 5:30 PM CDT (22:30 UTC)
Expired: Jun 22, 2007, 7:00 PM CDT
In force: 90 min
Issued by: the Storm Prediction Center

Counties Adams County, IL, Bond County, IL, Brown County, IL, Calhoun County, IL, Clinton County, IL, Greene County, IL, Jersey County, IL, Macoupin County, IL, Madison County, IL, Morgan County, IL, Pike County, IL, Saint Clair County, IL, Schuyler County, IL, Scott County, IL, Washington County, IL, City of Saint Louis, MO, Lincoln County, MO, Pike County, MO, Saint Charles County, MO, Saint Louis County, MO

The radar

The St Louis radar (KLSX), 73 km from the middle of the area, began a volume at 22:33 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 12:00Z, 10.5 hours before the alert went out and 255 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: 529 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 131 m²/s²
0-3 km storm-relative helicity: 115 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

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 21, 8:38 PM CDT	Mesoscale Discussion	SPC	Cass, DeWitt, Fulton, Knox, Logan, McLean and 9 more	97 min
Jun 21, 9:05 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Brown, Cass, Champaign, Christian, Clark and 35 more	5 hr
Jun 22, 1:41 PM CDT	Mesoscale Discussion	SPC	Adams, Brown, Hancock, Henderson, McDonough, Pike and 2 more	64 min
Jun 22, 1:49 PM CDT	Severe Thunderstorm Watch	SPC	Clark, Scotland	7 hr
Jun 22, 2:21 PM CDT	Mesoscale Discussion	SPC	Atchison, Nodaway	114 min
Jun 22, 6:02 PM CDT	Mesoscale Discussion	SPC	Adair, Andrew, Daviess, DeKalb, Gentry, Grundy and 9 more	88 min

Nearby

Mesoscale Discussions in Illinois, 2007 Mesoscale Discussions in Missouri, 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.