Alert archive / Indiana / Mesoscale Discussions in 2022

Mesoscale Discussion 848

May 21, 202223 counties in Illinois; 29 counties in Indiana

The Storm Prediction Center issued this mesoscale discussion at May 21, 2022, 10:06 AM CDT for 23 counties in Illinois; 29 counties in Indiana. It was in force for 114 min.

The area

The outline as issued.

The facts

Issued: May 21, 2022, 10:06 AM CDT (15:06 UTC)
Expired: May 21, 2022, 12:00 PM CDT
In force: 114 min
Issued by: the Storm Prediction Center
Concerning: Severe potential...watch possible
Chance of a watch: 40%

All 52 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, Edwards County, IL, Effingham County, IL, Fayette County, IL, Franklin County, IL, Hamilton County, IL, Jasper County, IL, Jefferson County, IL, Lawrence County, IL, Marion County, IL, Perry County, IL, Richland County, IL, Wabash County, IL, Washington County, IL, Wayne County, IL, White County, IL, Bartholomew County, IN, Brown County, IN, Clay County, IN, Daviess County, IN, Decatur County, IN, Dubois County, IN, Gibson County, IN, Greene County, IN, Hendricks County, IN, Jackson County, IN, Jennings County, IN, Johnson County, IN, Knox County, IN, Lawrence County, IN, Marion County, IN, Martin County, IN, Monroe County, IN, Morgan County, IN, Orange County, IN, Owen County, IN, Parke County, IN, Pike County, IN, Putnam County, IN, Rush County, IN, Scott County, IN, Shelby County, IN, Sullivan County, IN, Vigo County, IN, Washington County, IN

The radar

The Evansville,IN radar (KVWX), 61 km from the middle of the area, began a volume at 15:08 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 254May 21, 12:50 PM CDT

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 3.1 hours before the alert went out and 165 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: 1180 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 46 m²/s²
0-3 km storm-relative helicity: 181 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
May 20, 7:10 PM CDT	Mesoscale Discussion	SPC	Adams, Boone, Brown, Bureau, Calhoun, Cass and 48 more	2 hr
May 21, 12:00 PM CDT	Mesoscale Discussion	SPC	Crawford, Gallatin, Lawrence, Wabash, White	2 hr
May 21, 12:51 PM CDT	Severe Thunderstorm Watch	SPC	Edwards, Gallatin, Hardin, Pope, Wabash, White	7 hr
May 21, 3:30 PM CDT	Mesoscale Discussion	SPC	Bartholomew, Clark, Dearborn, Decatur, Fayette, Floyd and 16 more	90 min

Nearby

Mesoscale Discussions in Indiana, 2022 Mesoscale Discussions in Illinois, 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.