Alert archive / Kansas / Mesoscale Discussions in 2011

Mesoscale Discussion 731

May 11, 201128 counties in Kansas

The Storm Prediction Center issued this mesoscale discussion at May 11, 2011, 11:21 AM CDT for 28 counties in Kansas. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued: May 11, 2011, 11:21 AM CDT (16:21 UTC)
Expired: May 11, 2011, 12:45 PM CDT
In force: 84 min
Issued by: the Storm Prediction Center

All 28 counties

Butler County, KS, Chase County, KS, Clay County, KS, Cloud County, KS, Coffey County, KS, Dickinson County, KS, Elk County, KS, Geary County, KS, Greenwood County, KS, Jackson County, KS, Lincoln County, KS, Lyon County, KS, Marion County, KS, Marshall County, KS, Mitchell County, KS, Morris County, KS, Nemaha County, KS, Osage County, KS, Ottawa County, KS, Pottawatomie County, KS, Republic County, KS, Riley County, KS, Saline County, KS, Shawnee County, KS, Wabaunsee County, KS, Washington County, KS, Wilson County, KS, Woodson County, KS

The radar

The Topeka radar (KTWX), 75 km from the middle of the area, began a volume at 16:23 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.

Severe Thunderstorm Watch 279May 11, 12:20 PM CDT

The nearest sounding before it

Topeka, KS (KTOP), launched 12:00Z, 4.4 hours before the alert went out and 120 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 2161 J/kg
Mixed-layer CIN: -95 J/kg
Mixed-layer LCL: 1016 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: -22 m²/s²
0-3 km storm-relative helicity: 99 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.5

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.

Issued	Product	Office	Counties	Lasted
May 11, 7:30 AM CDT	Mesoscale Discussion	SPC	Meade, Seward, Stevens	60 min
May 11, 12:16 PM CDT	Severe Thunderstorm Watch	SPC	Allen, Anderson, Brown, Butler, Chase, Chautauqua and 48 more	5 hr
May 11, 1:51 PM CDT	Mesoscale Discussion	SPC	Clark, Comanche, Edwards, Finney, Ford, Gove and 25 more	84 min
May 11, 3:57 PM CDT	Mesoscale Discussion	SPC	Allen, Anderson, Atchison, Bourbon, Brown, Cherokee and 25 more	48 min
May 11, 4:00 PM CDT	Severe Thunderstorm Watch	SPC	Allen, Anderson, Atchison, Bourbon, Brown, Chautauqua and 24 more	8 hr
May 11, 4:52 PM CDT	Tornado Watch	SPC	Cheyenne, Decatur, Gove, Graham, Logan, Norton and 7 more	6 hr
May 11, 6:02 PM CDT	Mesoscale Discussion	SPC	Barber, Barton, Clark, Comanche, Edwards, Ellis and 9 more	88 min
May 11, 6:35 PM CDT	Mesoscale Discussion	SPC	Cherokee, Labette	55 min

Nearby

Mesoscale Discussions in Kansas, 2011 Every 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.