Alert archive / Illinois / Mesoscale Discussions in 2015

Mesoscale Discussion 593

May 10, 201530 counties in Illinois; 4 counties in Kentucky; 30 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at May 10, 2015, 3:52 PM CDT for 30 counties in Illinois; 4 counties in Kentucky; 30 counties in Missouri. It was in force for 68 min.

The area

The outline as issued.

The facts

Issued
May 10, 2015, 3:52 PM CDT (20:52 UTC)
Expired
May 10, 2015, 5:00 PM CDT
In force
68 min
Issued by
the Storm Prediction Center
All 64 counties

Adams County, IL, Alexander County, IL, Bond County, IL, Brown County, IL, Calhoun County, IL, Clinton County, IL, Franklin County, IL, Greene County, IL, Hamilton County, IL, Jackson County, IL, Jefferson County, IL, Jersey County, IL, Johnson County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Massac County, IL, Monroe County, IL, Morgan County, IL, Perry County, IL, Pike County, IL, Pope County, IL, Pulaski County, IL, Randolph County, IL, Saint Clair County, IL, Saline County, IL, Scott County, IL, Union County, IL, Washington County, IL, Williamson County, IL, Ballard County, KY, Carlisle County, KY, Livingston County, KY, McCracken County, KY, Bollinger County, MO, Butler County, MO, Cape Girardeau County, MO, Carter County, MO, City of Saint Louis, MO, Crawford County, MO, Franklin County, MO, Gasconade County, MO, Iron County, MO, Jefferson County, MO, Lewis County, MO, Lincoln County, MO, Madison County, MO, Marion County, MO, Mississippi County, MO, Montgomery County, MO, New Madrid County, MO, Perry County, MO, Pike County, MO, Ralls County, MO, Reynolds County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Scott County, MO, Stoddard County, MO, Warren County, MO, Washington County, MO, Wayne County, MO

The radar

The St Louis radar (KLSX), 42 km from the middle of the area, began a volume at 20:51 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 12:00Z, 8.9 hours before the alert went out and 257 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 12:00Z on 2015-05-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 66 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 12:00Z on 2015-05-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 74 square meters per square second.193958Sfc1 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
66 J/kg
Mixed-layer CIN
-56 J/kg
Mixed-layer LCL
777 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
74 m²/s²
0-3 km storm-relative helicity
142 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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.

IssuedProductOfficeCountiesLasted
May 10, 4:02 PM CDTSevere Thunderstorm WatchSPCAlexander, Bond, Calhoun, Clinton, Fayette, Franklin and 23 more4 hr
May 10, 5:17 PM CDTMesoscale DiscussionSPCBrown, Bureau, Carroll, Cass, Christian, Fulton and 22 more88 min
May 10, 6:30 PM CDTMesoscale DiscussionSPCAlexander, Bond, Christian, Clay, Clinton, Edwards and 31 more90 min
May 10, 11:00 AM CDTMesoscale DiscussionSPCBarton, Bates, Benton, Boone, Camden, Cedar and 32 more3 hr
May 10, 11:52 AM CDTMesoscale DiscussionSPCAndrew, Atchison, Caldwell, Carroll, Chariton, Clinton and 14 more2 hr
May 10, 1:22 PM CDTTornado WatchSPCAdair, Audrain, Benton, Boone, Butler, Callaway and 54 more4 hr
May 10, 1:47 PM CDTSevere Thunderstorm WatchSPCAndrew, Atchison, Barry, Barton, Bates, Buchanan and 28 more8 hr
May 10, 3:13 PM CDTMesoscale DiscussionSPCAndrew, Atchison, Barton, Bates, Buchanan, Caldwell and 17 more92 min

Nearby

Mesoscale Discussions in Illinois, 2015Mesoscale Discussions in Missouri, 2015Mesoscale Discussions in Kentucky, 2015Every mesoscale discussion in 2015

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.