Alert archive / Kansas / Mesoscale Discussions in 2011

Mesoscale Discussion 843

May 21, 201136 counties in Kansas; 29 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at May 21, 2011, 7:18 PM CDT for 36 counties in Kansas; 29 counties in Missouri. It was in force for 57 min.

The area

The outline as issued.

The facts

Issued
May 21, 2011, 7:18 PM CDT (00:18 UTC)
Expired
May 21, 2011, 8:15 PM CDT
In force
57 min
Issued by
the Storm Prediction Center
All 65 counties

Atchison County, KS, Barton County, KS, Brown County, KS, Clay County, KS, Cloud County, KS, Dickinson County, KS, Doniphan County, KS, Douglas County, KS, Ellsworth County, KS, Franklin County, KS, Geary County, KS, Jackson County, KS, Jefferson County, KS, Jewell County, KS, Johnson County, KS, Leavenworth County, KS, Lincoln County, KS, Lyon County, KS, Marshall County, KS, McPherson County, KS, Mitchell County, KS, Morris County, KS, Nemaha County, KS, Osage County, KS, Osborne County, KS, Ottawa County, KS, Pottawatomie County, KS, Republic County, KS, Riley County, KS, Russell County, KS, Saline County, KS, Shawnee County, KS, Smith County, KS, Wabaunsee County, KS, Washington County, KS, Wyandotte County, KS, Andrew County, MO, Buchanan County, MO, Caldwell County, MO, Carroll County, MO, Chariton County, MO, Clay County, MO, Clinton County, MO, Cooper County, MO, Daviess County, MO, DeKalb County, MO, Gentry County, MO, Grundy County, MO, Harrison County, MO, Holt County, MO, Howard County, MO, Jackson County, MO, Johnson County, MO, Lafayette County, MO, Linn County, MO, Livingston County, MO, Mercer County, MO, Nodaway County, MO, Pettis County, MO, Platte County, MO, Putnam County, MO, Ray County, MO, Saline County, MO, Sullivan County, MO, Worth County, MO

The radar

The Topeka radar (KTWX), 85 km from the middle of the area, began a volume at 00:18 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

Omaha, NE (KOAX), launched 00:00Z, 0.3 hours before the alert went out and 211 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, Omaha, NE at 00:00Z on 2011-05-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1436 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, Omaha, NE at 00:00Z on 2011-05-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 99 square meters per square second.193958Sfc1 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
1436 J/kg
Mixed-layer CIN
-10 J/kg
Mixed-layer LCL
1205 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
99 m²/s²
0-3 km storm-relative helicity
145 m²/s²
Significant tornado parameter
0.6
Supercell composite
5.0

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 22, 10:53 AM CDTMesoscale DiscussionSPCAnderson, Franklin, Johnson, Linn, Miami, Wyandotte2 hr
May 22, 12:51 PM CDTTornado WatchSPCLinn, Miami10 hr
May 22, 1:06 PM CDTMesoscale DiscussionSPCBourbon, Chautauqua, Cherokee, Crawford, Labette, Montgomery and 2 more114 min
May 22, 1:27 PM CDTTornado WatchSPCAllen, Bourbon, Chautauqua, Cherokee, Crawford, Labette and 3 more8 hr
May 22, 3:48 PM CDTMesoscale DiscussionSPCCherokee, Crawford117 min
May 22, 6:10 PM CDTMesoscale DiscussionSPCCherokee, Crawford65 min
May 21, 8:55 PM CDTMesoscale DiscussionSPCAtchison65 min
May 22, 4:41 AM CDTMesoscale DiscussionSPCAdair, Audrain, Boone, Clark, Knox, Lewis and 9 more2 hr
May 22, 5:18 AM CDTMesoscale DiscussionSPCDunklin, Pemiscot57 min

Nearby

Mesoscale Discussions in Kansas, 2011Mesoscale Discussions in Missouri, 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.