Alert archive / Missouri / Mesoscale Discussions in 2013

Mesoscale Discussion 902

May 31, 201311 counties in Illinois; 24 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at May 31, 2013, 8:45 AM CDT for 11 counties in Illinois; 24 counties in Missouri. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued
May 31, 2013, 8:45 AM CDT (13:45 UTC)
Expired
May 31, 2013, 10:15 AM CDT
In force
90 min
Issued by
the Storm Prediction Center
Chance of a watch
40%
All 35 counties

Bond County, IL, Calhoun County, IL, Clinton County, IL, Greene County, IL, Jersey County, IL, Macoupin County, IL, Madison County, IL, Monroe County, IL, Montgomery County, IL, Randolph County, IL, Saint Clair County, IL, Callaway County, MO, Camden County, MO, City of Saint Louis, MO, Cole County, MO, Crawford County, MO, Dent County, MO, Franklin County, MO, Gasconade County, MO, Iron County, MO, Jefferson County, MO, Lincoln County, MO, Maries County, MO, Miller County, MO, Montgomery County, MO, Osage County, MO, Phelps County, MO, Pike County, MO, Pulaski County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Warren County, MO, Washington County, MO

The radar

The St Louis radar (KLSX), 34 km from the middle of the area, began a volume at 13:46 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

Lincoln, IL (KILX), launched 12:00Z, 1.8 hours before the alert went out and 274 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 2013-05-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 8 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 2013-05-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 215 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
8 J/kg
Mixed-layer CIN
-299 J/kg
Mixed-layer LCL
1021 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
215 m²/s²
0-3 km storm-relative helicity
222 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

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 30, 7:04 PM CDTMesoscale DiscussionSPCBond, Boone, Calhoun, Champaign, Christian, Clark and 56 more56 min
May 30, 7:38 PM CDTSevere Thunderstorm WatchSPCChampaign, Christian, Clark, Clay, Coles, Crawford and 12 more5 hr
May 30, 10:03 PM CDTMesoscale DiscussionSPCChampaign, Clark, Clay, Coles, Cook, Crawford and 11 more87 min
May 31, 5:21 PM CDTMesoscale DiscussionSPCCalhoun, Christian, Greene, Jersey, Logan, Macoupin and 4 more54 min
May 31, 5:45 PM CDTTornado WatchSPCBond, Calhoun, Clinton, Fayette, Greene, Jersey and 8 more4 hr
May 30, 7:41 PM CDTMesoscale DiscussionSPCAtchison2 hr
May 30, 8:46 PM CDTTornado WatchSPCDunklin, Pemiscot7 hr
May 31, 1:57 AM CDTMesoscale DiscussionSPCButler, Carter, Oregon, Ripley93 min
May 31, 2:05 AM CDTMesoscale DiscussionSPCBuchanan, Clay, Clinton, Jackson, Platte, Ray85 min
May 31, 2:44 AM CDTSevere Thunderstorm WatchSPCBuchanan, Caldwell, Carroll, Cass, Chariton, Clay and 14 more5 hr
May 31, 4:51 AM CDTMesoscale DiscussionSPCCaldwell, Carroll, Cass, Chariton, Clay, Clinton and 11 more114 min
May 31, 7:03 AM CDTMesoscale DiscussionSPCCass, Cooper, Howard, Johnson, Pettis57 min
May 31, 1:49 PM CDTMesoscale DiscussionSPCBarry, Barton, Bates, Benton, Camden, Cass and 29 more116 min
May 31, 2:15 PM CDTTornado WatchSPCBarry, Barton, Bates, Benton, Boone, Callaway and 30 more8 hr

Nearby

Mesoscale Discussions in Missouri, 2013Mesoscale Discussions in Illinois, 2013Every mesoscale discussion in 2013

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.