Alert archive / Oklahoma / Mesoscale Discussions in 2013

Mesoscale Discussion 907

May 31, 201335 counties in Oklahoma; Wichita County, Texas

The Storm Prediction Center issued this mesoscale discussion at May 31, 2013, 2:40 PM CDT for 35 counties in Oklahoma; Wichita County, Texas. It was in force for 95 min.

The area

The outline as issued.

The facts

Issued
May 31, 2013, 2:40 PM CDT (19:40 UTC)
Expired
May 31, 2013, 4:15 PM CDT
In force
95 min
Issued by
the Storm Prediction Center
Chance of a watch
95%
All 36 counties

Blaine County, OK, Caddo County, OK, Canadian County, OK, Carter County, OK, Cleveland County, OK, Comanche County, OK, Cotton County, OK, Creek County, OK, Garfield County, OK, Garvin County, OK, Grady County, OK, Hughes County, OK, Jefferson County, OK, Kay County, OK, Kingfisher County, OK, Kiowa County, OK, Lincoln County, OK, Logan County, OK, McClain County, OK, Murray County, OK, Noble County, OK, Okfuskee County, OK, Oklahoma County, OK, Okmulgee County, OK, Osage County, OK, Pawnee County, OK, Payne County, OK, Pontotoc County, OK, Pottawatomie County, OK, Rogers County, OK, Seminole County, OK, Stephens County, OK, Tillman County, OK, Tulsa County, OK, Washington County, OK, Wichita County, TX

The radar

The Norman radar (KTLX), 19 km from the middle of the area, began a volume at 19:43 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, 7.7 hours before the alert went out and 32 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 2013-05-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3114 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 2013-05-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 585 square meters per square second.193958Sfc1 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
3114 J/kg
Mixed-layer CIN
-161 J/kg
Mixed-layer LCL
566 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
585 m²/s²
0-3 km storm-relative helicity
551 m²/s²
Significant tornado parameter
2.3
Supercell composite
12.7

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 30, 8:09 PM CDTMesoscale DiscussionSPCAdair, Sequoyah66 min
May 30, 8:46 PM CDTTornado WatchSPCAdair, Cherokee, Delaware, Haskell, LeFlore, Sequoyah7 hr
May 30, 9:03 PM CDTMesoscale DiscussionSPCCarter, Coal, Garvin, Hughes, Johnston, McIntosh and 6 more57 min
May 30, 11:28 PM CDTMesoscale DiscussionSPCAdair, LeFlore, Sequoyah2 hr
May 31, 1:57 AM CDTMesoscale DiscussionSPCLeFlore93 min
May 31, 1:49 PM CDTMesoscale DiscussionSPCCraig, Delaware, Nowata, Ottawa116 min
May 31, 3:27 PM CDTTornado Watch PDSSPCBlaine, Caddo, Canadian, Carter, Cleveland, Comanche and 36 more9 hr
May 31, 4:58 PM CDTMesoscale DiscussionSPCCaddo, Canadian, Carter, Cleveland, Coal, Comanche and 29 more92 min
May 31, 6:33 PM CDTMesoscale DiscussionSPCCanadian, Cleveland, Kingfisher, Logan, Noble, Oklahoma and 3 more27 min

Nearby

Mesoscale Discussions in Oklahoma, 2013Mesoscale Discussions in Texas, 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.