Alert archive / Oklahoma / Mesoscale Discussions in 2011

Mesoscale Discussion 934

May 24, 201127 counties in Oklahoma; 8 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 24, 2011, 4:48 PM CDT for 27 counties in Oklahoma; 8 counties in Texas. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued
May 24, 2011, 4:48 PM CDT (21:48 UTC)
Expired
May 24, 2011, 6:15 PM CDT
In force
87 min
Issued by
the Storm Prediction Center
All 35 counties

Caddo County, OK, Canadian County, OK, Carter County, OK, Cleveland County, OK, Cotton County, OK, Creek County, OK, Garfield County, OK, Garvin County, OK, Grady County, OK, Jefferson County, OK, Johnston County, OK, Kingfisher County, OK, Lincoln County, OK, Logan County, OK, Love County, OK, Marshall County, OK, McClain County, OK, Murray County, OK, Noble County, OK, Okfuskee County, OK, Oklahoma County, OK, Pawnee County, OK, Payne County, OK, Pontotoc County, OK, Pottawatomie County, OK, Seminole County, OK, Stephens County, OK, Clay County, TX, Cooke County, TX, Denton County, TX, Grayson County, TX, Jack County, TX, Montague County, TX, Tarrant County, TX, Wise County, TX

The radar

The Norman radar (KTLX), 78 km from the middle of the area, began a volume at 21:48 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

Norman, OK (KOUN), launched 12:00Z, 9.8 hours before the alert went out and 62 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 2011-05-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2178 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 2011-05-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 422 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
2178 J/kg
Mixed-layer CIN
-195 J/kg
Mixed-layer LCL
573 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
422 m²/s²
0-3 km storm-relative helicity
490 m²/s²
Significant tornado parameter
0.0
Supercell composite
6.9

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

625 
ACUS11 KWNS 242148
SWOMCD
SPC MCD 242148 
OKZ000-TXZ000-242315-

MESOSCALE DISCUSSION 0934
NWS STORM PREDICTION CENTER NORMAN OK
0448 PM CDT TUE MAY 24 2011

AREAS AFFECTED...CNTRL OK THROUGH N-CNTRL TX

CONCERNING...TORNADO WATCH 356...

VALID 242148Z - 242315Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 356 CONTINUES.

SUPERCELLS CAPABLE OF PRODUCING STRONG TO VIOLENT TORNADOES AND VERY
LARGE HAIL WILL MOVE INTO CNTRL OK AND N-CNTRL TX...LIKELY AFFECTING
THE OKLAHOMA CITY AND DALLAS-FORT WORTH METRO AREAS BETWEEN 5 AND 7
PM THIS EVENING. GREATEST THREAT CURRENTLY APPEARS ACROSS CNTRL AND
S-CNTRL OK.

A LINE OF DISCRETE SUPERCELLS THAT INITIATED ALONG THE DRYLINE
EXTENDS FROM NEAR ENID IN N-CNTRL OK SWD TO NEAR MINERAL WELLS IN
N-CNTRL TX. THE DOWNSTREAM ATMOSPHERE IS VERY UNSTABLE WITH
3000-4000 J/KG MLCAPE...VERY STEEP LAPSE RATES AND A MOIST BOUNDARY
LAYER. THE TWIN LAKES VWP ALREADY INDICATE VERY STRONG /60-70 KT/
SFC-6 KM SHEAR AND LARGE HODOGRAPHS WITH 300+ M2/S2 0-1 KM STORM
RELATIVE HELICITY. SEVERAL TORNADOES HAVE ALREADY BEEN
CONFIRMED...AND THIS PARAMETER SPACE WILL CONTINUE TO SUPPORT
SUPERCELLS CAPABLE OF LONG TRACK...DAMAGING TORNADOES AND VERY LARGE
HAIL AS STORMS MOVE THROUGH CNTRL OK AND N-CNTRL TX NEXT FEW HOURS.

..DIAL.. 05/24/2011

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

ATTN...WFO...TSA...FWD...OUN...

LAT...LON   32799852 35419837 36539807 36869648 35609625 32769682
            32799852

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 23, 7:50 PM CDTMesoscale DiscussionSPCComanche, Cotton, Jackson, Jefferson, Stephens, Tillman55 min
May 23, 9:22 PM CDTMesoscale DiscussionSPCAdair, Blaine, Canadian, Cherokee, Creek, Haskell and 15 more23 min
May 23, 9:42 PM CDTSevere Thunderstorm WatchSPCBlaine, Caddo, Canadian, Cleveland, Creek, Grady and 18 more6 hr
May 24, 2:08 AM CDTMesoscale DiscussionSPCCherokee, Creek, Haskell, LeFlore, McIntosh, Muskogee and 5 more97 min
May 24, 12:18 PM CDTMesoscale DiscussionSPCBlaine, Caddo, Canadian, Carter, Cleveland, Comanche and 21 more87 min
May 24, 12:47 PM CDTTornado Watch PDSSPCAlfalfa, Atoka, Blaine, Bryan, Caddo, Canadian and 51 more11 hr
May 24, 2:35 PM CDTMesoscale DiscussionSPCAlfalfa, Grant, Kay, Woods85 min
May 24, 6:43 PM CDTMesoscale DiscussionSPCBryan, Carter, Cleveland, Coal, Creek, Garvin and 17 more62 min
May 24, 2:15 PM CDTMesoscale DiscussionSPCBrown, Callahan, Coke, Coleman, Comanche, Concho and 28 more90 min

Nearby

Mesoscale Discussions in Oklahoma, 2011Mesoscale Discussions in Texas, 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.