Alert archive / Kansas / Mesoscale Discussions in 2011

Mesoscale Discussion 831

May 20, 201133 counties in Kansas; 21 counties in Nebraska; 8 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at May 20, 2011, 6:01 PM CDT for 33 counties in Kansas; 21 counties in Nebraska; 8 counties in Oklahoma. It was in force for 59 min.

The area

The outline as issued.

The facts

Issued
May 20, 2011, 6:01 PM CDT (23:01 UTC)
Expired
May 20, 2011, 7:00 PM CDT
In force
59 min
Issued by
the Storm Prediction Center
All 62 counties

Barber County, KS, Barton County, KS, Clay County, KS, Cloud County, KS, Comanche County, KS, Edwards County, KS, Ellis County, KS, Ellsworth County, KS, Harper County, KS, Harvey County, KS, Jewell County, KS, Kingman County, KS, Kiowa County, KS, Lincoln County, KS, McPherson County, KS, Mitchell County, KS, Osborne County, KS, Ottawa County, KS, Pawnee County, KS, Phillips County, KS, Pratt County, KS, Reno County, KS, Republic County, KS, Rice County, KS, Rooks County, KS, Rush County, KS, Russell County, KS, Saline County, KS, Sedgwick County, KS, Smith County, KS, Stafford County, KS, Sumner County, KS, Washington County, KS, Adams County, NE, Buffalo County, NE, Clay County, NE, Fillmore County, NE, Franklin County, NE, Hall County, NE, Hamilton County, NE, Harlan County, NE, Howard County, NE, Jefferson County, NE, Kearney County, NE, Merrick County, NE, Nuckolls County, NE, Phelps County, NE, Polk County, NE, Saline County, NE, Seward County, NE, Sherman County, NE, Thayer County, NE, Webster County, NE, York County, NE, Alfalfa County, OK, Ellis County, OK, Garfield County, OK, Grant County, OK, Harper County, OK, Major County, OK, Woods County, OK, Woodward County, OK

The radar

The Grand Island radar (KUEX), 124 km from the middle of the area, began a volume at 23:05 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

Dodge City, (KDDC), launched 12:00Z, 11.0 hours before the alert went out and 195 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, Dodge City, at 12:00Z on 2011-05-20Temperature 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, Dodge City, at 12:00Z on 2011-05-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -59 square meters per square second.1939587897Sfc1 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
3052 m above ground
0-6 km bulk shear
58 kt
0-1 km storm-relative helicity
-59 m²/s²
0-3 km storm-relative helicity
27 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 19, 8:17 PM CDTMesoscale DiscussionSPCBarber, Barton, Clark, Clay, Cloud, Comanche and 29 more118 min
May 19, 8:46 PM CDTTornado WatchSPCBarber, Barton, Clark, Clay, Cloud, Comanche and 34 more6 hr
May 19, 11:13 PM CDTMesoscale DiscussionSPCBarber, Barton, Clark, Clay, Cloud, Comanche and 29 more2 hr
May 20, 9:11 AM CDTMesoscale DiscussionSPCAllen, Anderson, Bourbon, Cherokee, Crawford, Douglas and 9 more2 hr
May 20, 1:52 PM CDTMesoscale DiscussionSPCBarber, Barton, Comanche, Edwards, Ellsworth, Jewell and 11 more113 min
May 20, 2:32 PM CDTSevere Thunderstorm WatchSPCBarber, Barton, Clark, Clay, Cloud, Comanche and 30 more7 hr
May 19, 7:47 PM CDTMesoscale DiscussionSPCCaddo, Canadian, Comanche, Cotton, Grady, Kiowa and 1 more118 min
May 19, 11:39 PM CDTSevere Thunderstorm WatchSPCHarmon, Jackson, Tillman6 hr
May 20, 2:58 AM CDTMesoscale DiscussionSPCComanche, Jackson, Kiowa, Tillman, Washita92 min
May 20, 10:30 AM CDTMesoscale DiscussionSPCBryan, Choctaw, Haskell, Latimer, LeFlore, McCurtain and 2 more60 min
May 20, 11:03 AM CDTTornado WatchSPCAdair, Choctaw, Haskell, Latimer, LeFlore, McCurtain and 2 more7 hr
May 20, 1:28 PM CDTMesoscale DiscussionSPCAdair, Cherokee, Choctaw, Haskell, Latimer, LeFlore and 3 more62 min
May 20, 4:00 PM CDTMesoscale DiscussionSPCChoctaw, LeFlore, McCurtain, Pushmataha60 min
May 20, 5:56 PM CDTTornado WatchSPCMcCurtain3 hr

Nearby

Mesoscale Discussions in Kansas, 2011Mesoscale Discussions in Nebraska, 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.