Alert archive / Illinois / Mesoscale Discussions in 2019

Mesoscale Discussion 738

May 22, 201926 counties in Illinois; 5 counties in Iowa; 14 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at May 22, 2019, 5:59 PM CDT for 26 counties in Illinois; 5 counties in Iowa; 14 counties in Missouri. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
May 22, 2019, 5:59 PM CDT (22:59 UTC)
Expired
May 22, 2019, 8:00 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 45 counties

Des Moines County, IA, Henry County, IA, Lee County, IA, Louisa County, IA, Van Buren County, IA, Adams County, IL, Brown County, IL, Bureau County, IL, Calhoun County, IL, Cass County, IL, Fulton County, IL, Greene County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Knox County, IL, Marshall County, IL, Mason County, IL, McDonough County, IL, Menard County, IL, Mercer County, IL, Morgan County, IL, Peoria County, IL, Pike County, IL, Putnam County, IL, Schuyler County, IL, Scott County, IL, Stark County, IL, Tazewell County, IL, Warren County, IL, Woodford County, IL, Audrain County, MO, Boone County, MO, Callaway County, MO, Clark County, MO, Knox County, MO, Lewis County, MO, Lincoln County, MO, Marion County, MO, Monroe County, MO, Montgomery County, MO, Pike County, MO, Ralls County, MO, Scotland County, MO, Shelby County, MO

The radar

The St Louis radar (KLSX), 148 km from the middle of the area, began a volume at 23:02 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, 11.0 hours before the alert went out and 193 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, Davenport, at 12:00Z on 2019-05-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Davenport, at 12:00Z on 2019-05-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 315 square meters per square second.1939587897117136Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1378 m above ground
0-6 km bulk shear
94 kt
0-1 km storm-relative helicity
315 m²/s²
0-3 km storm-relative helicity
375 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.

IssuedProductOfficeCountiesLasted
May 21, 7:37 PM CDTMesoscale DiscussionSPCAlexander, Bond, Calhoun, Christian, Clark, Clay and 39 more83 min
May 21, 8:48 PM CDTTornado WatchSPCAlexander, Clay, Coles, Cumberland, Effingham, Franklin and 11 more3 hr
May 21, 11:26 PM CDTMesoscale DiscussionSPCClark, Crawford, Cumberland, Edwards, Gallatin, Hamilton and 11 more94 min
May 22, 4:00 PM CDTTornado WatchSPCAdams, Brown, Bureau, Cass, Fulton, Hancock and 18 more7 hr
May 21, 8:46 PM CDTMesoscale DiscussionSPCFremont, Mills, Montgomery, Page59 min
May 22, 3:06 PM CDTMesoscale DiscussionSPCBarry, Barton, Bates, Benton, Camden, Cass and 16 more114 min
May 22, 3:32 PM CDTTornado Watch PDSSPCBarton, Bates, Benton, Camden, Carroll, Cass and 22 more7 hr
May 22, 5:05 PM CDTMesoscale DiscussionSPCMcDonald, Newton85 min

Nearby

Mesoscale Discussions in Illinois, 2019Mesoscale Discussions in Missouri, 2019Mesoscale Discussions in Iowa, 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.