Alert archive / Oklahoma / Mesoscale Discussions in 2012

Mesoscale Discussion 525

April 14, 201227 counties in Oklahoma; 12 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 14, 2012, 1:23 PM CDT for 27 counties in Oklahoma; 12 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Apr 14, 2012, 1:23 PM CDT (18:23 UTC)
Expired
Apr 14, 2012, 3:30 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 39 counties

Beaver County, OK, Beckham County, OK, Blaine County, OK, Caddo County, OK, Canadian County, OK, Carter County, OK, Cleveland County, OK, Comanche County, OK, Cotton County, OK, Custer County, OK, Dewey County, OK, Ellis County, OK, Garvin County, OK, Grady County, OK, Greer County, OK, Harmon County, OK, Jackson County, OK, Jefferson County, OK, Kingfisher County, OK, Kiowa County, OK, Logan County, OK, McClain County, OK, Oklahoma County, OK, Roger Mills County, OK, Stephens County, OK, Tillman County, OK, Washita County, OK, Archer County, TX, Baylor County, TX, Childress County, TX, Clay County, TX, Collingsworth County, TX, Foard County, TX, Hardeman County, TX, Hemphill County, TX, Lipscomb County, TX, Wheeler County, TX, Wichita County, TX, Wilbarger County, TX

The radar

The Altus AFB radar (KFDR), 126 km from the middle of the area, began a volume at 18:21 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 12:00Z, 6.4 hours before the alert went out and 209 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 12:00Z on 2012-04-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 831 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, Lamont, OK at 12:00Z on 2012-04-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 509 square meters per square second.19395878Sfc1 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
831 J/kg
Mixed-layer CIN
-32 J/kg
Mixed-layer LCL
634 m above ground
0-6 km bulk shear
58 kt
0-1 km storm-relative helicity
509 m²/s²
0-3 km storm-relative helicity
470 m²/s²
Significant tornado parameter
0.0
Supercell composite
9.4

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 13, 7:35 PM CDTMesoscale DiscussionSPCBeckham, Blaine, Caddo, Canadian, Cleveland, Comanche and 24 more55 min
Apr 13, 8:36 PM CDTTornado WatchSPCAlfalfa, Beckham, Blaine, Caddo, Canadian, Cleveland and 31 more7 hr
Apr 13, 9:58 PM CDTMesoscale DiscussionSPCBeckham, Blaine, Caddo, Canadian, Cleveland, Comanche and 19 more92 min
Apr 13, 11:45 PM CDTMesoscale DiscussionSPCBeckham, Blaine, Caddo, Canadian, Cleveland, Comanche and 20 more90 min
Apr 14, 2:40 AM CDTMesoscale DiscussionSPCAlfalfa, Beckham, Blaine, Caddo, Canadian, Cleveland and 31 more65 min
Apr 14, 3:42 AM CDTTornado WatchSPCCraig, Creek, Delaware, Kay, Lincoln, Logan and 11 more5 hr
Apr 14, 7:11 AM CDTMesoscale DiscussionSPCCraig, Delaware, Kay, Logan, Mayes, Noble and 8 more64 min
Apr 14, 9:42 AM CDTMesoscale DiscussionSPCBeaver, Beckham, Ellis, Harper, Roger Mills, Texas93 min
Apr 14, 10:43 AM CDTTornado Watch PDSSPCAlfalfa, Beckham, Blaine, Custer, Dewey, Ellis and 12 more7 hr
Apr 14, 11:44 AM CDTMesoscale DiscussionSPCAlfalfa, Beaver, Ellis, Garfield, Grant, Harper and 3 more61 min
Apr 14, 12:11 PM CDTMesoscale DiscussionSPCGrant, Kay, Noble, Osage, Pawnee, Washington64 min
Apr 14, 3:01 PM CDTMesoscale DiscussionSPCAlfalfa, Beckham, Custer, Dewey, Ellis, Greer and 9 more29 min
Apr 14, 3:48 PM CDTMesoscale DiscussionSPCAlfalfa, Beckham, Blaine, Custer, Dewey, Ellis and 10 more57 min
Apr 14, 4:54 PM CDTMesoscale DiscussionSPCAlfalfa, Dewey, Ellis, Grant, Harper, Major and 3 more66 min
Apr 14, 5:24 PM CDTTornado Watch PDSSPCAlfalfa, Beaver, Beckham, Blaine, Custer, Dewey and 18 more9 hr
Apr 13, 9:23 PM CDTMesoscale DiscussionSPCBriscoe, Childress, Collingsworth, Cottle, Donley, Hall and 1 more97 min

Nearby

Mesoscale Discussions in Oklahoma, 2012Mesoscale Discussions in Texas, 2012Every mesoscale discussion in 2012

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.