Alert archive / Oklahoma / Mesoscale Discussions in 2012

Mesoscale Discussion 520

April 14, 2012Cherokee County, Labette County, Kansas; 14 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Apr 14, 2012, 7:11 AM CDT for Cherokee County, Labette County, Kansas; 14 counties in Oklahoma. It was in force for 64 min.

The area

The outline as issued.

The facts

Issued
Apr 14, 2012, 7:11 AM CDT (12:11 UTC)
Expired
Apr 14, 2012, 8:15 AM CDT
In force
64 min
Issued by
the Storm Prediction Center

Counties Cherokee County, KS, Labette County, KS, Craig County, OK, Delaware County, OK, Kay County, OK, Logan County, OK, Mayes County, OK, Noble County, OK, Nowata County, OK, Osage County, OK, Ottawa County, OK, Pawnee County, OK, Payne County, OK, Rogers County, OK, Tulsa County, OK, Washington County, OK

The radar

The Tulsa radar (KINX), 86 km from the middle of the area, began a volume at 12:12 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, 0.2 hours before the alert went out and 100 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.

556 
ACUS11 KWNS 141212
SWOMCD
SPC MCD 141211
ARZ000-MOZ000-OKZ000-KSZ000-141315-

MESOSCALE DISCUSSION 0520
NWS STORM PREDICTION CENTER NORMAN OK
0711 AM CDT SAT APR 14 2012

AREAS AFFECTED...NERN OK/SERN KS

CONCERNING...TORNADO WATCH 164...

VALID 141211Z - 141315Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 164 CONTINUES.

LLJ IS EXPECTED TO INCREASE ACROSS ERN OK INTO SWRN MO INTO THE MID
MORNING HOURS.  AS A RESULT...WARM ADVECTION WILL LIKELY PROVE
INSTRUMENTAL IN THE MOVEMENT/PROPAGATION OF ONGOING THUNDERSTORM
COMPLEX INTO THE MID MS VALLEY.  THE STRONGEST UPDRAFTS ATTM ARE
LOCATED ON MOST BUOYANT SWRN FLANK OF THE ACTIVITY JUST NE OF TUL.
GIVEN THE LATEST TRENDS IT WOULD SEEM PROBABLE THAT HAIL/GUSTY WINDS
WILL ACCOMPANY THE SRN-MOST UPDRAFTS AS THEY SPREAD TOWARD A LESS
UNSTABLE AIR MASS DOWNSTREAM.

..DARROW.. 04/14/2012

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...SGF...TSA...ICT...OUN...

LAT...LON   36929753 37289461 36129460 35789754 36929753

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 13, 9:14 PM CDTMesoscale DiscussionSPCAllen, Anderson, Bourbon, Butler, Chase, Chautauqua and 17 more61 min
Apr 14, 3:42 AM CDTTornado WatchSPCChautauqua, Labette, Montgomery5 hr
Apr 14, 9:42 AM CDTMesoscale DiscussionSPCClark, Finney, Ford, Gove, Grant, Gray and 10 more93 min
Apr 14, 10:43 AM CDTTornado Watch PDSSPCBarber, Barton, Clark, Clay, Cloud, Comanche and 42 more7 hr
Apr 14, 11:44 AM CDTMesoscale DiscussionSPCBarber, Barton, Clark, Clay, Cloud, Comanche and 40 more61 min
Apr 14, 12:11 PM CDTMesoscale DiscussionSPCButler, Chase, Chautauqua, Coffey, Cowley, Dickinson and 19 more64 min
Apr 14, 1:41 PM CDTMesoscale DiscussionSPCDecatur, Rawlins2 hr
Apr 14, 1:44 PM CDTMesoscale DiscussionSPCBarton, Clark, Cloud, Edwards, Ellis, Ellsworth and 20 more61 min
Apr 14, 2:28 PM CDTMesoscale DiscussionSPCClay, Cloud, Jewell, Lincoln, Mitchell, Ottawa and 2 more32 min
Apr 14, 3:01 PM CDTMesoscale DiscussionSPCBarber, Barton, Clark, Comanche, Edwards, Ellsworth and 10 more29 min
Apr 14, 3:48 PM CDTMesoscale DiscussionSPCBarber, Barton, Clark, Clay, Cloud, Comanche and 33 more57 min
Apr 14, 4:47 PM CDTMesoscale DiscussionSPCAtchison, Brown, Doniphan, Nemaha58 min
Apr 14, 4:54 PM CDTMesoscale DiscussionSPCBarber, Barton, Clay, Cloud, Comanche, Dickinson and 32 more66 min
Apr 14, 5:00 PM CDTTornado WatchSPCDoniphan7 hr
Apr 14, 5:24 PM CDTTornado Watch PDSSPCBarber, Barton, Brown, Butler, Chase, Chautauqua and 57 more9 hr
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, 1:23 PM CDTMesoscale DiscussionSPCBeaver, Beckham, Blaine, Caddo, Canadian, Carter and 21 more2 hr

Nearby

Mesoscale Discussions in Oklahoma, 2012Mesoscale Discussions in Kansas, 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.