Alert archive / Oklahoma / Mesoscale Discussions in 2013

Mesoscale Discussion 726

May 20, 20135 states

The Storm Prediction Center issued this mesoscale discussion at May 20, 2013, 12:26 PM CDT for 5 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
May 20, 2013, 12:26 PM CDT (17:26 UTC)
Expired
May 20, 2013, 2:30 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
Chance of a watch
95%
All 94 counties

Benton County, AR, Washington County, AR, Allen County, KS, Bourbon County, KS, Chautauqua County, KS, Cherokee County, KS, Crawford County, KS, Elk County, KS, Labette County, KS, Linn County, KS, Montgomery County, KS, Neosho County, KS, Wilson County, KS, Woodson County, KS, Barry County, MO, Barton County, MO, Bates County, MO, Benton County, MO, Camden County, MO, Cedar County, MO, Christian County, MO, Dade County, MO, Dallas County, MO, Greene County, MO, Henry County, MO, Hickory County, MO, Jasper County, MO, Laclede County, MO, Lawrence County, MO, McDonald County, MO, Miller County, MO, Moniteau County, MO, Morgan County, MO, Newton County, MO, Pettis County, MO, Polk County, MO, St. Clair County, MO, Stone County, MO, Vernon County, MO, Webster County, MO, Adair County, OK, Atoka County, OK, Bryan County, OK, Canadian County, OK, Carter County, OK, Cherokee County, OK, Cleveland County, OK, Coal County, OK, Cotton County, OK, Craig County, OK, Creek County, OK, Delaware County, OK, Garvin County, OK, Grady County, OK, Haskell County, OK, Hughes County, OK, Jefferson County, OK, Johnston County, OK, Kay County, OK, Kingfisher County, OK, Lincoln County, OK, Logan County, OK, Love County, OK, Marshall County, OK, Mayes County, OK, McClain County, OK, McIntosh County, OK, Murray County, OK, Muskogee County, OK, Noble County, OK, Nowata County, OK, Okfuskee County, OK, Oklahoma County, OK, Okmulgee County, OK, Osage County, OK, Ottawa County, OK, Pawnee County, OK, Payne County, OK, Pittsburg County, OK, Pontotoc County, OK, Pottawatomie County, OK, Rogers County, OK, Seminole County, OK, Sequoyah County, OK, Stephens County, OK, Tulsa County, OK, Wagoner County, OK, Washington County, OK, Archer County, TX, Clay County, TX, Cooke County, TX, Grayson County, TX, Montague County, TX, Wichita County, TX

The radar

The Tulsa radar (KINX), 90 km from the middle of the area, began a volume at 17:25 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, 5.4 hours before the alert went out and 109 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 2013-05-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2243 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 2013-05-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 298 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
2243 J/kg
Mixed-layer CIN
-192 J/kg
Mixed-layer LCL
830 m above ground
0-6 km bulk shear
50 kt
0-1 km storm-relative helicity
298 m²/s²
0-3 km storm-relative helicity
297 m²/s²
Significant tornado parameter
0.0
Supercell composite
14.5

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 19, 10:44 PM CDTTornado WatchSPCBenton, Crawford, Washington5 hr
May 20, 1:10 PM CDTTornado WatchSPCBenton, Carroll, Crawford, Franklin, Madison, Sebastian and 1 more9 hr
May 20, 6:53 PM CDTMesoscale DiscussionSPCBaxter, Boone, Cleburne, Conway, Franklin, Fulton and 16 more67 min
May 19, 7:55 PM CDTMesoscale DiscussionSPCAllen, Anderson, Atchison, Brown, Chautauqua, Clay and 35 more65 min
May 19, 9:34 PM CDTMesoscale DiscussionSPCChautauqua, Labette, Montgomery, Neosho, Wilson26 min
May 19, 10:16 PM CDTMesoscale DiscussionSPCBourbon, Cherokee, Crawford59 min
May 19, 11:49 PM CDTMesoscale DiscussionSPCCherokee56 min
May 20, 2:44 AM CDTMesoscale DiscussionSPCChautauqua, Cherokee, Labette, Montgomery2 hr
May 20, 8:46 AM CDTMesoscale DiscussionSPCAllen, Anderson, Bourbon, Coffey, Linn, Miami and 3 more59 min
May 20, 12:46 PM CDTTornado WatchSPCAllen, Anderson, Bourbon, Chautauqua, Cherokee, Coffey and 13 more8 hr
May 20, 2:31 PM CDTMesoscale DiscussionSPCAllen, Chautauqua, Cherokee, Crawford, Elk, Labette and 4 more119 min
May 19, 7:13 PM CDTMesoscale DiscussionSPCClark62 min
May 19, 8:10 PM CDTTornado WatchSPCClark, Scotland6 hr
May 20, 3:27 PM CDTMesoscale DiscussionSPCAudrain, Lincoln, Marion, Monroe, Montgomery, Pike and 2 more63 min
May 20, 5:07 PM CDTMesoscale DiscussionSPCAudrain, Crawford, Franklin, Gasconade, Lincoln, Marion and 8 more23 min
May 20, 5:24 PM CDTTornado WatchSPCAudrain, Boone, Callaway, Clark, Cole, Crawford and 20 more7 hr
May 20, 5:38 PM CDTMesoscale DiscussionSPCAndrew, DeKalb, Gentry, Harrison, Worth67 min
May 19, 8:53 PM CDTMesoscale DiscussionSPCAdair, Atoka, Bryan, Canadian, Carter, Cherokee and 48 more67 min
May 20, 5:34 PM CDTMesoscale DiscussionSPCLove56 min
May 20, 6:33 PM CDTMesoscale DiscussionSPCBryan, Johnston, Love, Marshall57 min
May 20, 1:19 PM CDTMesoscale DiscussionSPCBell, Bosque, Brown, Burnet, Callahan, Clay and 29 more116 min
May 20, 2:21 PM CDTTornado WatchSPCBosque, Brown, Burnet, Callahan, Coleman, Collin and 33 more8 hr

Nearby

Mesoscale Discussions in Oklahoma, 2013Mesoscale Discussions in Missouri, 2013Mesoscale Discussions in Kansas, 2013Every mesoscale discussion in 2013

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.