Alert archive / Kansas / Mesoscale Discussions in 2011

Mesoscale Discussion 369

April 7, 201111 counties in Kansas; Bates County, Cass County, Jackson County, Missouri

The Storm Prediction Center issued this mesoscale discussion at Apr 7, 2011, 10:55 PM CDT for 11 counties in Kansas; Bates County, Cass County, Jackson County, Missouri. It was in force for 95 min.

The area

The outline as issued.

The facts

Issued
Apr 7, 2011, 10:55 PM CDT (03:55 UTC)
Expired
Apr 8, 2011, 12:30 AM CDT
In force
95 min
Issued by
the Storm Prediction Center

Counties Anderson County, KS, Chase County, KS, Coffey County, KS, Douglas County, KS, Franklin County, KS, Johnson County, KS, Linn County, KS, Lyon County, KS, Miami County, KS, Morris County, KS, Osage County, KS, Bates County, MO, Cass County, MO, Jackson County, MO

The radar

The Topeka radar (KTWX), 84 km from the middle of the area, began a volume at 03:57 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

Topeka, KS (KTOP), launched 00:00Z, 3.9 hours before the alert went out and 64 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 00:00Z on 2011-04-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 00:00Z on 2011-04-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 352 square meters per square second.1939587897117136Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
864 m above ground
0-6 km bulk shear
62 kt
0-1 km storm-relative helicity
352 m²/s²
0-3 km storm-relative helicity
514 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.4

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 8, 2:26 PM CDTMesoscale DiscussionSPCChautauqua, Cowley, Sumner94 min
Apr 8, 5:35 PM CDTTornado WatchSPCAllen, Anderson, Butler, Chase, Chautauqua, Coffey and 15 more9 hr

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.