Alert archive / Oklahoma / Mesoscale Discussions in 2011

Mesoscale Discussion 759

May 12, 20114 states

The Storm Prediction Center issued this mesoscale discussion at May 12, 2011, 1:46 PM CDT for 4 states. It was in force for 119 min.

The area

The outline as issued.

The facts

Issued
May 12, 2011, 1:46 PM CDT (18:46 UTC)
Expired
May 12, 2011, 3:45 PM CDT
In force
119 min
Issued by
the Storm Prediction Center
All 37 counties

Benton County, AR, Crawford County, AR, Franklin County, AR, Madison County, AR, Sebastian County, AR, Washington County, AR, McDonald County, MO, Newton County, MO, Adair County, OK, Atoka County, OK, Bryan County, OK, Cherokee County, OK, Choctaw County, OK, Coal County, OK, Craig County, OK, Delaware County, OK, Haskell County, OK, Hughes County, OK, Johnston County, OK, Latimer County, OK, LeFlore County, OK, Marshall County, OK, Mayes County, OK, McCurtain County, OK, McIntosh County, OK, Muskogee County, OK, Okmulgee County, OK, Ottawa County, OK, Pittsburg County, OK, Pontotoc County, OK, Pushmataha County, OK, Rogers County, OK, Sequoyah County, OK, Wagoner County, OK, Fannin County, TX, Grayson County, TX, Lamar County, TX

The radar

The Western Arkansas radar (KSRX), 113 km from the middle of the area, began a volume at 18:44 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, 6.8 hours before the alert went out and 173 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 2011-05-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1116 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 2011-05-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 120 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
1116 J/kg
Mixed-layer CIN
-142 J/kg
Mixed-layer LCL
682 m above ground
0-6 km bulk shear
57 kt
0-1 km storm-relative helicity
120 m²/s²
0-3 km storm-relative helicity
58 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.1

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
May 11, 7:43 PM CDTMesoscale DiscussionSPCClark, Conway, Faulkner, Garland, Hempstead, Hot Spring and 12 more62 min
May 12, 3:17 PM CDTSevere Thunderstorm WatchSPCBaxter, Benton, Boone, Carroll, Conway, Crawford and 20 more7 hr
May 12, 6:30 PM CDTMesoscale DiscussionSPCBenton, Boone, Carroll, Crawford, Franklin, Johnson and 8 more90 min
May 11, 8:16 PM CDTMesoscale DiscussionSPCAtchison, Holt, Nodaway59 min
May 12, 4:54 PM CDTMesoscale DiscussionSPCBates, Benton, Boone, Buchanan, Caldwell, Camden and 25 more66 min
May 12, 5:31 PM CDTSevere Thunderstorm WatchSPCAdair, Audrain, Bates, Boone, Caldwell, Callaway and 33 more6 hr
May 11, 11:25 PM CDTMesoscale DiscussionSPCAustin, Bandera, Bastrop, Bexar, Brazos, Burleson and 27 more65 min
May 12, 2:57 AM CDTMesoscale DiscussionSPCAtascosa, Bandera, Bastrop, Bexar, Blanco, Caldwell and 25 more33 min
May 12, 3:18 AM CDTSevere Thunderstorm WatchSPCBandera, Dimmit, Edwards, Frio, Kerr, Kinney and 7 more5 hr
May 12, 7:27 AM CDTMesoscale DiscussionSPCAtascosa, Bandera, Bee, Bexar, Brooks, Dimmit and 26 more33 min
May 12, 7:52 AM CDTSevere Thunderstorm WatchSPCAransas, Atascosa, Bandera, Bee, Bexar, Brooks and 33 more9 hr
May 12, 8:46 AM CDTMesoscale DiscussionSPCBastrop, Bell, Bosque, Brazos, Burleson, Caldwell and 22 more59 min
May 12, 9:02 AM CDTSevere Thunderstorm WatchSPCAnderson, Austin, Bastrop, Bell, Blanco, Bosque and 53 more6 hr
May 12, 11:43 AM CDTMesoscale DiscussionSPCAnderson, Aransas, Austin, Bee, Brazos, Burleson and 33 more92 min

Nearby

Mesoscale Discussions in Oklahoma, 2011Mesoscale Discussions in Arkansas, 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.