Alert archive / Kansas / Mesoscale Discussions in 2015

Mesoscale Discussion 357

April 18, 201515 counties in Kansas; 11 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Apr 18, 2015, 4:07 PM CDT for 15 counties in Kansas; 11 counties in Oklahoma. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Apr 18, 2015, 4:07 PM CDT (21:07 UTC)
Expired
Apr 18, 2015, 6:30 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
Chance of a watch
60%
All 26 counties

Butler County, KS, Chase County, KS, Chautauqua County, KS, Clay County, KS, Cowley County, KS, Dickinson County, KS, Elk County, KS, Geary County, KS, Greenwood County, KS, Harvey County, KS, Marion County, KS, Morris County, KS, Riley County, KS, Sedgwick County, KS, Sumner County, KS, Garfield County, OK, Grant County, OK, Kay County, OK, Kingfisher County, OK, Lincoln County, OK, Logan County, OK, Noble County, OK, Oklahoma County, OK, Osage County, OK, Pawnee County, OK, Payne County, OK

The radar

The Vance AFB radar (KVNX), 68 km from the middle of the area, began a volume at 21:08 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

Norman, OK (KOUN), launched 12:00Z, 9.1 hours before the alert went out and 187 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, Norman, OK at 12:00Z on 2015-04-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 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, Norman, OK at 12:00Z on 2015-04-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 11 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1320 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
11 m²/s²
0-3 km storm-relative helicity
-8 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
Apr 17, 7:06 PM CDTMesoscale DiscussionSPCBarber, Cheyenne, Clark, Comanche, Decatur, Edwards and 28 more84 min
Apr 17, 7:26 PM CDTMesoscale DiscussionSPCGrant, Morton, Stevens2 hr
Apr 17, 8:24 PM CDTMesoscale DiscussionSPCEllsworth, Lincoln, Mitchell, Osborne, Phillips, Russell and 1 more2 hr
Apr 17, 8:56 PM CDTMesoscale DiscussionSPCCheyenne, Clark, Comanche, Decatur, Edwards, Ellis and 28 more94 min
Apr 18, 12:45 PM CDTMesoscale DiscussionSPCBarber, Harper, Kingman, Pratt60 min
Apr 18, 1:52 PM CDTMesoscale DiscussionSPCBarber, Clark, Comanche, Edwards, Ford, Kiowa and 1 more113 min
Apr 18, 2:43 PM CDTSevere Thunderstorm WatchSPCBarber, Barton, Butler, Clark, Comanche, Cowley and 27 more8 hr
Apr 18, 2:49 PM CDTMesoscale DiscussionSPCCheyenne, Decatur, Graham, Norton, Phillips, Rawlins and 3 more116 min
Apr 18, 3:08 PM CDTTornado WatchSPCCheyenne, Decatur, Gove, Graham, Greeley, Logan and 7 more6 hr
Apr 18, 5:31 PM CDTMesoscale DiscussionSPCBarber, Barton, Clark, Comanche, Edwards, Ellis and 24 more59 min
Apr 18, 6:07 PM CDTMesoscale DiscussionSPCCheyenne, Decatur, Gove, Logan, Rawlins, Sheridan and 3 more53 min
Apr 18, 2:27 PM CDTTornado WatchSPCAlfalfa, Beckham, Blaine, Caddo, Comanche, Cotton and 16 more6 hr
Apr 18, 6:03 PM CDTMesoscale DiscussionSPCAlfalfa, Beckham, Blaine, Caddo, Comanche, Cotton and 13 more87 min
Apr 18, 6:21 PM CDTMesoscale DiscussionSPCCanadian, Carter, Cleveland, Garvin, Grady, Hughes and 11 more84 min
Apr 18, 6:31 PM CDTSevere Thunderstorm WatchSPCAlfalfa, Atoka, Beckham, Blaine, Bryan, Caddo and 38 more6 hr

Nearby

Mesoscale Discussions in Kansas, 2015Mesoscale Discussions in Oklahoma, 2015Every mesoscale discussion in 2015

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.