Alert archive / Missouri / Mesoscale Discussions in 2013

Mesoscale Discussion 491

April 17, 201323 counties in Kansas; 40 counties in Missouri; 4 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Apr 17, 2013, 9:50 AM CDT for 23 counties in Kansas; 40 counties in Missouri; 4 counties in Oklahoma. It was in force for 55 min.

The area

The outline as issued.

The facts

Issued
Apr 17, 2013, 9:50 AM CDT (14:50 UTC)
Expired
Apr 17, 2013, 10:45 AM CDT
In force
55 min
Issued by
the Storm Prediction Center
Chance of a watch
60%
All 67 counties

Allen County, KS, Anderson County, KS, Bourbon County, KS, Chautauqua County, KS, Cherokee County, KS, Coffey County, KS, Crawford County, KS, Douglas County, KS, Elk County, KS, Franklin County, KS, Greenwood County, KS, Jefferson County, KS, Johnson County, KS, Labette County, KS, Leavenworth County, KS, Linn County, KS, Miami County, KS, Montgomery County, KS, Neosho County, KS, Osage County, KS, Wilson County, KS, Woodson County, KS, Wyandotte County, KS, Barton County, MO, Bates County, MO, Benton County, MO, Boone County, MO, Buchanan County, MO, Caldwell County, MO, Camden County, MO, Carroll County, MO, Cass County, MO, Cedar County, MO, Chariton County, MO, Clay County, MO, Clinton County, MO, Cole County, MO, Cooper County, MO, Dade County, MO, Dallas County, MO, Greene County, MO, Henry County, MO, Hickory County, MO, Howard County, MO, Jackson County, MO, Jasper County, MO, Johnson County, MO, Lafayette County, MO, Lawrence County, MO, Livingston County, MO, Macon County, MO, Miller County, MO, Moniteau County, MO, Morgan County, MO, Newton County, MO, Pettis County, MO, Platte County, MO, Polk County, MO, Randolph County, MO, Ray County, MO, Saline County, MO, St. Clair County, MO, Vernon County, MO, Craig County, OK, Nowata County, OK, Ottawa County, OK, Washington County, OK

The radar

The Pleasant Hill radar (KEAX), 87 km from the middle of the area, began a volume at 14:52 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

Topeka, KS (KFOE), launched 12:00Z, 2.8 hours before the alert went out and 139 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, Topeka, KS at 12:00Z on 2013-04-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 8 joules per kilogram.LCLEL10008507005003002001001 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, Topeka, KS at 12:00Z on 2013-04-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 667 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
0 J/kg
Mixed-layer LCL
423 m above ground
0-6 km bulk shear
57 kt
0-1 km storm-relative helicity
667 m²/s²
0-3 km storm-relative helicity
666 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.2

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 17, 12:41 AM CDTMesoscale DiscussionSPCBarber, Butler, Chase, Clark, Comanche, Dickinson and 17 more94 min
Apr 17, 11:11 AM CDTTornado WatchSPCBourbon, Cherokee, Crawford, Johnson, Leavenworth, Linn and 2 more11 hr
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, 3:38 PM CDTMesoscale DiscussionSPCBourbon, Cherokee, Crawford, Johnson, Linn, Miami and 1 more97 min
Apr 17, 6:02 PM CDTMesoscale DiscussionSPCAllen, Anderson, Bourbon, Chautauqua, Cherokee, Coffey and 16 more88 min
Apr 16, 8:44 PM CDTMesoscale DiscussionSPCSaint Louis, City of Saint Louis2 hr
Apr 17, 8:49 AM CDTMesoscale DiscussionSPCAdair, Andrew, Buchanan, Caldwell, Carroll, Chariton and 25 more56 min
Apr 17, 9:14 AM CDTSevere Thunderstorm WatchSPCAdair, Andrew, Clark, Daviess, DeKalb, Gentry and 11 more10 hr
Apr 17, 1:33 PM CDTMesoscale DiscussionSPCAdair, Andrew, Clark, Daviess, DeKalb, Gentry and 11 more57 min
Apr 17, 4:19 PM CDTMesoscale DiscussionSPCScotland26 min
Apr 17, 1:21 PM CDTTornado WatchSPCBlaine, Caddo, Canadian, Carter, Cherokee, Cleveland and 45 more10 hr
Apr 17, 5:23 PM CDTMesoscale DiscussionSPCCaddo, Canadian, Carter, Cherokee, Cleveland, Coal and 37 more97 min
Apr 17, 6:30 PM CDTMesoscale DiscussionSPCCleveland, Comanche, Grady, McClain90 min

Nearby

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