Alert archive / Oklahoma / Mesoscale Discussions in 2013

Mesoscale Discussion 418

April 9, 201322 counties in Kansas; 31 counties in Oklahoma; 9 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 9, 2013, 8:51 PM CDT for 22 counties in Kansas; 31 counties in Oklahoma; 9 counties in Texas. It was in force for 54 min.

The area

The outline as issued.

The facts

Issued
Apr 9, 2013, 8:51 PM CDT (01:51 UTC)
Expired
Apr 9, 2013, 9:45 PM CDT
In force
54 min
Issued by
the Storm Prediction Center
All 62 counties

Barber County, KS, Barton County, KS, Butler County, KS, Chase County, KS, Comanche County, KS, Cowley County, KS, Edwards County, KS, Ellsworth County, KS, Harper County, KS, Harvey County, KS, Kingman County, KS, Kiowa County, KS, Marion County, KS, McPherson County, KS, Morris County, KS, Pawnee County, KS, Pratt County, KS, Reno County, KS, Rice County, KS, Sedgwick County, KS, Stafford County, KS, Sumner County, KS, Alfalfa County, OK, Beckham County, OK, Blaine County, OK, Caddo County, OK, Canadian County, OK, Cleveland County, OK, Comanche County, OK, Cotton County, OK, Custer County, OK, Dewey County, OK, Garfield County, OK, Garvin County, OK, Grady County, OK, Grant County, OK, Greer County, OK, Jackson County, OK, Jefferson County, OK, Kay County, OK, Kingfisher County, OK, Kiowa County, OK, Logan County, OK, Major County, OK, McClain County, OK, Noble County, OK, Oklahoma County, OK, Payne County, OK, Stephens County, OK, Tillman County, OK, Washita County, OK, Woods County, OK, Woodward County, OK, Archer County, TX, Baylor County, TX, Clay County, TX, Foard County, TX, Hardeman County, TX, Knox County, TX, Montague County, TX, Wichita County, TX, Wilbarger County, TX

The radar

The Norman radar (KTLX), 126 km from the middle of the area, began a volume at 01:52 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

Lamont, OK (KLMN), launched 00:00Z, 1.9 hours before the alert went out and 156 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, Lamont, OK at 00:00Z on 2013-04-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1 joules per kilogram.LCLEL10008507005003002001001 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, Lamont, OK at 00:00Z on 2013-04-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 378 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
1 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
541 m above ground
0-6 km bulk shear
69 kt
0-1 km storm-relative helicity
378 m²/s²
0-3 km storm-relative helicity
508 m²/s²
Significant tornado parameter
0.0
Supercell composite
11.1

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 9, 7:22 PM CDTMesoscale DiscussionSPCBarber, Barton, Clark, Cloud, Comanche, Edwards and 13 more2 hr
Apr 9, 8:41 PM CDTMesoscale DiscussionSPCBrown, Clay, Cloud, Dickinson, Geary, Jackson and 10 more64 min
Apr 9, 9:01 PM CDTMesoscale DiscussionSPCAllen, Anderson, Bourbon, Cherokee, Crawford, Franklin and 7 more89 min
Apr 9, 11:27 PM CDTMesoscale DiscussionSPCBarber, Barton, Brown, Butler, Chase, Clay and 32 more63 min
Apr 10, 5:32 AM CDTMesoscale DiscussionSPCBarber, Butler, Chase, Cowley, Dickinson, Greenwood and 13 more4 hr
Apr 9, 7:28 PM CDTMesoscale DiscussionSPCCallahan, Eastland, Jack, Palo Pinto, Shackelford, Stephens and 3 more62 min
Apr 10, 4:46 PM CDTMesoscale DiscussionSPCNewton119 min

Nearby

Mesoscale Discussions in Oklahoma, 2013Mesoscale Discussions in Kansas, 2013Mesoscale Discussions in Texas, 2013Every mesoscale discussion in 2013

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.