Alert archive / Illinois / Mesoscale Discussions in 2022

Mesoscale Discussion 749

May 13, 20229 counties in Illinois; Green County, Wisconsin

The Storm Prediction Center issued this mesoscale discussion at May 13, 2022, 2:53 PM CDT for 9 counties in Illinois; Green County, Wisconsin. It was in force for 97 min.

The area

The outline as issued.

The facts

Issued: May 13, 2022, 2:53 PM CDT (19:53 UTC)
Expired: May 13, 2022, 4:30 PM CDT
In force: 97 min
Issued by: the Storm Prediction Center
Concerning: Severe potential...watch unlikely
Chance of a watch: 5%

Counties Bureau County, IL, Carroll County, IL, Henry County, IL, Lee County, IL, Ogle County, IL, Stark County, IL, Stephenson County, IL, Whiteside County, IL, Winnebago County, IL, Green County, WI

The radar

The Quad Cities radar (KDVN), 87 km from the middle of the area, began a volume at 19:57 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, 7.9 hours before the alert went out and 81 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: 723 J/kg
Mixed-layer CIN: -160 J/kg
Mixed-layer LCL: 938 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: -72 m²/s²
0-3 km storm-relative helicity: -52 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -1.1

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
May 13, 12:37 PM CDT	Mesoscale Discussion	SPC	Madison, Monroe, Randolph, Saint Clair	2 hr
May 13, 5:22 PM CDT	Mesoscale Discussion	SPC	Adams, Brown, Calhoun, Cass, Fulton, Greene and 13 more	2 hr
May 12, 7:11 PM CDT	Severe Thunderstorm Watch	SPC	Burnett	6 hr
May 12, 8:40 PM CDT	Mesoscale Discussion	SPC	Barron, Burnett, Douglas, Polk, Washburn	95 min
May 13, 4:47 PM CDT	Mesoscale Discussion	SPC	Brown, Calumet, Columbia, Dane, Dodge, Florence and 18 more	2 hr

Nearby

Mesoscale Discussions in Illinois, 2022 Mesoscale Discussions in Wisconsin, 2022 Every mesoscale discussion in 2022

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.