Alert archive / Oklahoma / Mesoscale Discussions in 2011

Mesoscale Discussion 938

May 24, 201123 counties in Oklahoma; 6 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 24, 2011, 6:43 PM CDT for 23 counties in Oklahoma; 6 counties in Texas. It was in force for 62 min.

The area

The outline as issued.

The facts

Issued
May 24, 2011, 6:43 PM CDT (23:43 UTC)
Expired
May 24, 2011, 7:45 PM CDT
In force
62 min
Issued by
the Storm Prediction Center
All 29 counties

Bryan County, OK, Carter County, OK, Cleveland County, OK, Coal County, OK, Creek County, OK, Garvin County, OK, Hughes County, OK, Jefferson County, OK, Johnston County, OK, Lincoln County, OK, Love County, OK, Marshall County, OK, McClain County, OK, Murray County, OK, Okfuskee County, OK, Okmulgee County, OK, Osage County, OK, Pawnee County, OK, Payne County, OK, Pontotoc County, OK, Pottawatomie County, OK, Seminole County, OK, Tulsa County, OK, Collin County, TX, Cooke County, TX, Denton County, TX, Grayson County, TX, Montague County, TX, Wise County, TX

The radar

The Norman radar (KTLX), 49 km from the middle of the area, began a volume at 23:43 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, 11.7 hours before the alert went out and 48 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.

038 
ACUS11 KWNS 242343
SWOMCD
SPC MCD 242343 
OKZ000-TXZ000-250045-

MESOSCALE DISCUSSION 0938
NWS STORM PREDICTION CENTER NORMAN OK
0643 PM CDT TUE MAY 24 2011

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

CONCERNING...TORNADO WATCH 356...

VALID 242343Z - 250045Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 356 CONTINUES.

THREAT FOR STRONG TORNADOES...VERY LARGE HAIL AND DAMAGING WIND IS
EXPECTED TO PERSIST FROM CNTRL THROUGH ERN OK INTO N-CNTRL TX THE
NEXT FEW HOURS.

NUMEROUS STORMS INCLUDING A FEW SUPERCELLS CONTINUE FROM N-CNTRL TX
THROUGH CNTRL AND E-CNTRL OK. MANY STORMS IN CNTRL OK HAVE BECOME
TEMPORARILY LESS ORGANIZED DUE TO DESTRUCTIVE INTERFERENCE
ASSOCIATED WITH CELL MERGERS AND OUTFLOW INTERACTIONS. HOWEVER...THE
ENVIRONMENT REMAINS SUPPORTIVE OF TORNADOES AND VERY LARGE HAIL WITH
LARGE 0-1 KM HODOGRAPHS AND STRONG INSTABILITY...AND SOME STORMS
WILL LIKELY REORGANIZE DURING THE EVENING. FARTHER SOUTH STORMS
REMAIN MORE DISCRETE ACROSS N-CNTRL TX AND WILL ALSO CONTINUE TO
POSE A THREAT FOR VERY LARGE HAIL AND TORNADOES.

..DIAL.. 05/24/2011

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

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

LAT...LON   34759775 36659694 36779611 36019564 32999642 32829824
            34759775

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, 4:48 PM CDTMesoscale DiscussionSPCCaddo, Canadian, Carter, Cleveland, Cotton, Creek and 21 more87 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.