Alert archive / Missouri / Mesoscale Discussions in 2011

Mesoscale Discussion 946

May 25, 20115 states

The Storm Prediction Center issued this mesoscale discussion at May 25, 2011, 12:48 AM CDT for 5 states. It was in force for 57 min.

The area

The outline as issued.

The facts

Issued
May 25, 2011, 12:48 AM CDT (05:48 UTC)
Expired
May 25, 2011, 1:45 AM CDT
In force
57 min
Issued by
the Storm Prediction Center
All 96 counties

Clay County, AR, Craighead County, AR, Fulton County, AR, Greene County, AR, Independence County, AR, Jackson County, AR, Lawrence County, AR, Randolph County, AR, Sharp County, AR, White County, AR, Lee County, IA, Adams County, IL, Alexander County, IL, Bond County, IL, Brown County, IL, Calhoun County, IL, Cass County, IL, Clinton County, IL, Greene County, IL, Hancock County, IL, Jackson County, IL, Jersey County, IL, Macoupin County, IL, Madison County, IL, Mason County, IL, McDonough County, IL, Menard County, IL, Monroe County, IL, Montgomery County, IL, Morgan County, IL, Perry County, IL, Pike County, IL, Pulaski County, IL, Randolph County, IL, Saint Clair County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Union County, IL, Washington County, IL, Ballard County, KY, Carlisle County, KY, Fulton County, KY, Hickman County, KY, Audrain County, MO, Bollinger County, MO, Boone County, MO, Butler County, MO, Callaway County, MO, Cape Girardeau County, MO, Carter County, MO, Chariton County, MO, City of Saint Louis, MO, Clark County, MO, Cole County, MO, Crawford County, MO, Dent County, MO, Dunklin County, MO, Franklin County, MO, Gasconade County, MO, Howard County, MO, Iron County, MO, Jefferson County, MO, Knox County, MO, Lewis County, MO, Lincoln County, MO, Macon County, MO, Madison County, MO, Maries County, MO, Marion County, MO, Mississippi County, MO, Moniteau County, MO, Monroe County, MO, Montgomery County, MO, New Madrid County, MO, Oregon County, MO, Osage County, MO, Pemiscot County, MO, Perry County, MO, Phelps County, MO, Pike County, MO, Ralls County, MO, Randolph County, MO, Reynolds County, MO, Ripley County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Scott County, MO, Shannon County, MO, Shelby County, MO, Stoddard County, MO, Warren County, MO, Washington County, MO, Wayne County, MO

The radar

The St Louis radar (KLSX), 62 km from the middle of the area, began a volume at 05:48 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

Springfield, MO (KSGF), launched 00:00Z, 5.8 hours before the alert went out and 281 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, Springfield, MO at 00:00Z on 2011-05-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1213 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, Springfield, MO at 00:00Z on 2011-05-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 106 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
1213 J/kg
Mixed-layer CIN
-94 J/kg
Mixed-layer LCL
941 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
106 m²/s²
0-3 km storm-relative helicity
200 m²/s²
Significant tornado parameter
0.7
Supercell composite
6.2

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 24, 7:42 PM CDTMesoscale DiscussionSPCBenton, Crawford, Little River, Polk, Scott, Sebastian and 2 more63 min
May 24, 8:05 PM CDTTornado WatchSPCBaxter, Benton, Boone, Carroll, Clark, Conway and 30 more7 hr
May 24, 11:24 PM CDTMesoscale DiscussionSPCBaxter, Boone, Carroll, Clark, Conway, Franklin and 21 more96 min
May 25, 7:31 AM CDTMesoscale DiscussionSPCClay, Craighead, Crittenden, Cross, Greene, Mississippi and 1 more59 min
May 25, 9:54 AM CDTMesoscale DiscussionSPCBaxter, Boone, Carroll, Clay, Cleburne, Conway and 33 more96 min
May 25, 10:18 AM CDTMesoscale DiscussionSPCFulton, Independence, Izard, Jackson, St. Francis, Sharp and 2 more57 min
May 25, 10:37 AM CDTTornado WatchSPCBaxter, Boone, Carroll, Fulton, Izard, Madison and 5 more7 hr
May 25, 11:02 AM CDTMesoscale DiscussionSPCClay28 min
May 25, 11:52 AM CDTMesoscale DiscussionSPCArkansas, Clark, Clay, Cleburne, Cleveland, Conway and 38 more83 min
May 25, 12:28 PM CDTTornado Watch PDSSPCArkansas, Baxter, Bradley, Calhoun, Clark, Clay and 41 more8 hr
May 25, 1:53 PM CDTMesoscale DiscussionSPCBradley, Calhoun, Clark, Columbia, Dallas, Hempstead and 9 more2 hr
May 25, 2:56 PM CDTMesoscale DiscussionSPCArkansas, Calhoun, Clark, Clay, Cleburne, Cleveland and 33 more94 min
May 25, 3:10 PM CDTMesoscale DiscussionSPCClay95 min
May 25, 3:16 PM CDTTornado WatchSPCAshley, Chicot, Columbia, Lafayette, Miller, Nevada and 1 more7 hr
May 25, 5:56 PM CDTMesoscale DiscussionSPCArkansas, Craighead, Crittenden, Cross, Greene, Lee and 5 more64 min
May 25, 1:22 AM CDTTornado WatchSPCAdams, Brown, Calhoun, Cass, Fulton, Greene and 16 more7 hr
May 25, 4:58 AM CDTMesoscale DiscussionSPCBond, Brown, Calhoun, Cass, Champaign, Christian and 45 more92 min
May 25, 5:46 AM CDTTornado WatchSPCBond, Champaign, Christian, Clark, Clay, Clinton and 35 more7 hr
May 25, 7:48 AM CDTMesoscale DiscussionSPCChampaign, Clark, Clay, Clinton, Coles, Crawford and 18 more87 min
May 25, 8:33 AM CDTMesoscale DiscussionSPCChampaign, DeWitt, Douglas, Edgar, Ford, Iroquois and 3 more87 min
May 25, 11:09 AM CDTTornado Watch PDSSPCAlexander, Bond, Calhoun, Christian, Clark, Clay and 41 more10 hr
May 25, 2:31 PM CDTTornado WatchSPCBureau, Cass, Champaign, DeKalb, DeWitt, Ford and 33 more7 hr
May 25, 2:32 PM CDTMesoscale DiscussionSPCCalhoun, Greene, Jersey, Macoupin, Pike, Scott58 min
May 25, 5:48 PM CDTMesoscale DiscussionSPCBureau, Champaign, DeKalb, DeWitt, Douglas, Ford and 19 more117 min
May 25, 6:25 PM CDTMesoscale DiscussionSPCAlexander, Clay, Clinton, Edwards, Franklin, Gallatin and 20 more2 hr
May 25, 12:55 PM CDTTornado WatchSPCBoone, Bracken, Campbell, Carroll, Gallatin, Grant and 6 more8 hr
May 25, 5:19 PM CDTMesoscale DiscussionSPCTrimble86 min
May 24, 7:07 PM CDTMesoscale DiscussionSPCAndrew, Barton, Bates, Buchanan, Cass, Cedar and 14 more53 min
May 24, 7:26 PM CDTTornado WatchSPCAdair, Barry, Barton, Bates, Benton, Buchanan and 48 more7 hr
May 25, 1:28 PM CDTMesoscale DiscussionSPCAdair, Audrain, Boone, Caldwell, Callaway, Camden and 44 more92 min

Nearby

Mesoscale Discussions in Missouri, 2011Mesoscale Discussions in Illinois, 2011Mesoscale Discussions in Arkansas, 2011Every mesoscale discussion in 2011

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.