Alert archive / Kansas / Mesoscale Discussions in 2011
Mesoscale Discussion 512
The Storm Prediction Center issued this mesoscale discussion at Apr 21, 2011, 11:27 PM CDT for 55 counties in Kansas; 9 counties in Missouri; 7 counties in Oklahoma. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 21, 2011, 11:27 PM CDT (04:27 UTC)
- Expired
- Apr 22, 2011, 2:00 AM CDT
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
All 71 counties
Allen County, KS, Anderson County, KS, Atchison County, KS, Bourbon County, KS, Brown County, KS, Butler County, KS, Chase County, KS, Chautauqua County, KS, Cherokee County, KS, Clay County, KS, Coffey County, KS, Cowley County, KS, Crawford County, KS, Dickinson County, KS, Doniphan County, KS, Douglas County, KS, Elk County, KS, Ellsworth County, KS, Franklin County, KS, Geary County, KS, Greenwood County, KS, Harper County, KS, Harvey County, KS, Jackson County, KS, Jefferson County, KS, Johnson County, KS, Kingman County, KS, Labette County, KS, Leavenworth County, KS, Linn County, KS, Lyon County, KS, Marion County, KS, Marshall County, KS, McPherson County, KS, Miami County, KS, Montgomery County, KS, Morris County, KS, Nemaha County, KS, Neosho County, KS, Osage County, KS, Ottawa County, KS, Pottawatomie County, KS, Pratt County, KS, Reno County, KS, Rice County, KS, Riley County, KS, Saline County, KS, Sedgwick County, KS, Shawnee County, KS, Stafford County, KS, Sumner County, KS, Wabaunsee County, KS, Wilson County, KS, Woodson County, KS, Wyandotte County, KS, Barton County, MO, Bates County, MO, Buchanan County, MO, Cass County, MO, Clay County, MO, Jackson County, MO, Jasper County, MO, Platte County, MO, Vernon County, MO, Craig County, OK, Grant County, OK, Kay County, OK, Nowata County, OK, Osage County, OK, Ottawa County, OK, Washington County, OK
The radar
The Wichita radar (KICT), 114 km from the middle of the area, began a volume at 04:30 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 (KTOP), launched 00:00Z, 4.5 hours before the alert went out and 126 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1049 m above ground
- 0-6 km bulk shear
- 61 kt
- 0-1 km storm-relative helicity
- 292 m²/s²
- 0-3 km storm-relative helicity
- 537 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 22, 2:48 AM CDT | Severe Thunderstorm Watch | SPC | Anderson, Atchison, Brown, Chase, Clay, Cloud and 31 more | 4 hr |
| Apr 22, 5:18 AM CDT | Mesoscale Discussion | SPC | Atchison, Brown, Doniphan, Douglas, Franklin, Jackson and 11 more | 87 min |
| Apr 22, 10:09 AM CDT | Mesoscale Discussion | SPC | Bollinger, Cape Girardeau, Crawford, Dent, Franklin, Gasconade and 17 more | 66 min |
| Apr 22, 10:44 AM CDT | Mesoscale Discussion | SPC | Barry, Bollinger, Carter, Christian, Crawford, Dent and 19 more | 61 min |
| Apr 22, 1:04 PM CDT | Mesoscale Discussion | SPC | Barry, Barton, Benton, Callaway, Camden, Cedar and 40 more | 116 min |
| Apr 22, 1:23 PM CDT | Mesoscale Discussion | SPC | McDonald, Newton | 97 min |
| Apr 22, 3:34 PM CDT | Tornado Watch | SPC | Audrain, Barry, Benton, Boone, Callaway, Camden and 46 more | 6 hr |
| Apr 22, 5:21 PM CDT | Mesoscale Discussion | SPC | Audrain, Barry, Boone, Callaway, Camden, Christian and 36 more | 114 min |
| Apr 22, 5:27 PM CDT | Mesoscale Discussion | SPC | Cape Girardeau, Perry, Sainte Genevieve, Saint Francois | 33 min |
| Apr 22, 5:49 PM CDT | Tornado Watch | SPC | Bollinger, Butler, Cape Girardeau, Carter, Iron, Madison and 9 more | 7 hr |
| Apr 22, 3:47 PM CDT | Tornado Watch | SPC | Adair, Atoka, Bryan, Carter, Cherokee, Choctaw and 33 more | 8 hr |
Nearby
Mesoscale Discussions in Kansas, 2011Mesoscale Discussions in Missouri, 2011Mesoscale Discussions in Oklahoma, 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.