Alert archive / Missouri / Mesoscale Discussions in 2013

Mesoscale Discussion 497

April 17, 20137 counties in Illinois; 7 counties in Kansas; 72 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Apr 17, 2013, 3:38 PM CDT for 7 counties in Illinois; 7 counties in Kansas; 72 counties in Missouri. It was in force for 97 min.

The area

The outline as issued.

The facts

Issued
Apr 17, 2013, 3:38 PM CDT (20:38 UTC)
Expired
Apr 17, 2013, 5:15 PM CDT
In force
97 min
Issued by
the Storm Prediction Center
All 86 counties

Adams County, IL, Brown County, IL, Calhoun County, IL, Greene County, IL, Jersey County, IL, Macoupin County, IL, Pike County, IL, Bourbon County, KS, Cherokee County, KS, Crawford County, KS, Johnson County, KS, Linn County, KS, Miami County, KS, Wyandotte County, KS, Audrain County, MO, Barry County, MO, Barton County, MO, Bates County, MO, Benton County, MO, Boone County, MO, Buchanan County, MO, Caldwell County, MO, Callaway County, MO, Camden County, MO, Carroll County, MO, Cass County, MO, Cedar County, MO, Chariton County, MO, Christian County, MO, City of Saint Louis, MO, Clay County, MO, Clinton County, MO, Cole County, MO, Cooper County, MO, Crawford County, MO, Dade County, MO, Dallas County, MO, Douglas County, MO, Franklin County, MO, Gasconade County, MO, Greene County, MO, Henry County, MO, Hickory County, MO, Howard County, MO, Jackson County, MO, Jasper County, MO, Jefferson County, MO, Johnson County, MO, Laclede County, MO, Lafayette County, MO, Lawrence County, MO, Lincoln County, MO, Linn County, MO, Livingston County, MO, Macon County, MO, Maries County, MO, Marion County, MO, McDonald County, MO, Miller County, MO, Moniteau County, MO, Monroe County, MO, Montgomery County, MO, Morgan County, MO, Newton County, MO, Osage County, MO, Pettis County, MO, Phelps County, MO, Pike County, MO, Platte County, MO, Polk County, MO, Pulaski County, MO, Ralls County, MO, Randolph County, MO, Ray County, MO, Saint Charles County, MO, Saint Louis County, MO, Saline County, MO, Shelby County, MO, St. Clair County, MO, Stone County, MO, Taney County, MO, Vernon County, MO, Warren County, MO, Washington County, MO, Webster County, MO, Wright County, MO

The radar

The St Louis radar (KLSX), 130 km from the middle of the area, began a volume at 20:39 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

Springfield, MO (KSGF), launched 12:00Z, 8.6 hours before the alert went out and 218 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 12:00Z on 2013-04-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1448 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 12:00Z on 2013-04-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 266 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
1448 J/kg
Mixed-layer CIN
-197 J/kg
Mixed-layer LCL
700 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
266 m²/s²
0-3 km storm-relative helicity
257 m²/s²
Significant tornado parameter
0.0
Supercell composite
7.2

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
Apr 16, 8:02 PM CDTMesoscale DiscussionSPCEdwards, Gallatin, Hamilton, Hardin, Saline, Wabash and 1 more88 min
Apr 16, 8:44 PM CDTMesoscale DiscussionSPCBond, Calhoun, Champaign, Christian, Clark, Clay and 35 more2 hr
Apr 17, 8:49 AM CDTMesoscale DiscussionSPCAdams, Brown, Bureau, Cass, DeWitt, Ford and 32 more56 min
Apr 17, 9:14 AM CDTSevere Thunderstorm WatchSPCBoone, Bureau, Carroll, Cook, DeKalb, DuPage and 30 more10 hr
Apr 17, 9:30 AM CDTMesoscale DiscussionSPCHardin2 hr
Apr 17, 11:11 AM CDTTornado WatchSPCAdams, Brown, Calhoun, Greene, Jersey, Macoupin and 1 more11 hr
Apr 17, 12:39 PM CDTSevere Thunderstorm WatchSPCHardin, Pope5 hr
Apr 17, 1:33 PM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, Cook, DeKalb, DuPage and 30 more57 min
Apr 17, 3:04 PM CDTMesoscale DiscussionSPCCass, Champaign, Christian, Clark, Coles, Cumberland and 26 more56 min
Apr 17, 3:33 PM CDTTornado WatchSPCCass, Champaign, Christian, Coles, DeWitt, Douglas and 24 more8 hr
Apr 17, 3:53 PM CDTMesoscale DiscussionSPCHardin, Pope67 min
Apr 17, 6:02 PM CDTMesoscale DiscussionSPCCalhoun, Greene, Jersey, Pike88 min
Apr 17, 6:46 PM CDTMesoscale DiscussionSPCCass, Champaign, Christian, Coles, DeWitt, Douglas and 18 more89 min
Apr 17, 12:41 AM CDTMesoscale DiscussionSPCBarber, Butler, Chase, Clark, Comanche, Dickinson and 17 more94 min
Apr 17, 9:50 AM CDTMesoscale DiscussionSPCAllen, Anderson, Bourbon, Chautauqua, Cherokee, Coffey and 17 more55 min
Apr 17, 1:09 PM CDTMesoscale DiscussionSPCBarber, Butler, Chautauqua, Cowley, Elk, Greenwood and 8 more96 min
Apr 17, 1:50 PM CDTTornado WatchSPCAllen, Anderson, Chautauqua, Coffey, Cowley, Douglas and 12 more8 hr
Apr 17, 4:19 PM CDTMesoscale DiscussionSPCScotland26 min

Nearby

Mesoscale Discussions in Missouri, 2013Mesoscale Discussions in Illinois, 2013Mesoscale Discussions in Kansas, 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.