Alert archive / Illinois / Mesoscale Discussions in 2019

Mesoscale Discussion 744

May 22, 201943 counties in Illinois; 14 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at May 22, 2019, 9:43 PM CDT for 43 counties in Illinois; 14 counties in Missouri. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued
May 22, 2019, 9:43 PM CDT (02:43 UTC)
Expired
May 22, 2019, 11:15 PM CDT
In force
92 min
Issued by
the Storm Prediction Center
All 57 counties

Adams County, IL, Bond County, IL, Brown County, IL, Bureau County, IL, Calhoun County, IL, Cass County, IL, Christian County, IL, DeWitt County, IL, Effingham County, IL, Fayette County, IL, Fulton County, IL, Greene County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Jersey County, IL, Knox County, IL, LaSalle County, IL, Livingston County, IL, Logan County, IL, Macon County, IL, Macoupin County, IL, Madison County, IL, Marshall County, IL, Mason County, IL, McDonough County, IL, McLean County, IL, Menard County, IL, Montgomery County, IL, Morgan County, IL, Moultrie County, IL, Peoria County, IL, Piatt County, IL, Pike County, IL, Putnam County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Shelby County, IL, Stark County, IL, Tazewell County, IL, Warren County, IL, Woodford County, IL, Audrain County, MO, City of Saint Louis, MO, Clark County, MO, Lewis County, MO, Lincoln County, MO, Marion County, MO, Monroe County, MO, Montgomery County, MO, Pike County, MO, Ralls County, MO, Saint Charles County, MO, Saint Louis County, MO, Shelby County, MO, Warren County, MO

The radar

The Lincoln radar (KILX), 75 km from the middle of the area, began a volume at 02:47 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.

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 2.7 hours before the alert went out and 136 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-pSkew-T log-p diagram, Lincoln, IL at 00:00Z on 2019-05-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 53 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 00:00Z on 2019-05-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 206 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
53 J/kg
Mixed-layer CIN
-161 J/kg
Mixed-layer LCL
1625 m above ground
0-6 km bulk shear
67 kt
0-1 km storm-relative helicity
206 m²/s²
0-3 km storm-relative helicity
283 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.5

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.

IssuedProductOfficeCountiesLasted
May 22, 8:12 PM CDTMesoscale DiscussionSPCAdams, Brown, Cass, Fulton, Hancock, Henderson and 14 more63 min
May 22, 10:26 PM CDTTornado WatchSPCBond, Brown, Calhoun, Cass, Champaign, Christian and 45 more8 hr
May 23, 1:23 AM CDTMesoscale DiscussionSPCBond, Calhoun, Cass, Champaign, Christian, Clinton and 37 more97 min
May 23, 3:50 AM CDTMesoscale DiscussionSPCClark, Edgar55 min
May 23, 2:39 PM CDTMesoscale DiscussionSPCAlexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 12 more96 min
May 22, 7:32 PM CDTMesoscale DiscussionSPCBarton, Bates, Benton, Boone, Callaway, Camden and 21 more88 min
May 22, 9:34 PM CDTMesoscale DiscussionSPCBarton, Cedar, Dade, Dallas, Hickory, Jasper and 2 more56 min
May 22, 9:44 PM CDTTornado WatchSPCBarry, Barton, Benton, Camden, Cedar, Christian and 23 more8 hr
May 23, 12:59 AM CDTMesoscale DiscussionSPCBarry, Camden, Christian, Dade, Dallas, Greene and 12 more91 min

Nearby

Mesoscale Discussions in Illinois, 2019Mesoscale Discussions in Missouri, 2019Every mesoscale discussion in 2019

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.