Alert archive / Oklahoma / Mesoscale Discussions in 2013

Mesoscale Discussion 908

May 31, 201335 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at May 31, 2013, 4:58 PM CDT for 35 counties in Oklahoma. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued: May 31, 2013, 4:58 PM CDT (21:58 UTC)
Expired: May 31, 2013, 6:30 PM CDT
In force: 92 min
Issued by: the Storm Prediction Center

All 35 counties

Caddo County, OK, Canadian County, OK, Carter County, OK, Cleveland County, OK, Coal County, OK, Comanche County, OK, Cotton County, OK, Creek County, OK, Garvin County, OK, Grady County, OK, Hughes County, OK, Johnston County, OK, Kingfisher County, OK, Lincoln County, OK, Logan County, OK, Marshall County, OK, McClain County, OK, McIntosh County, OK, Murray County, OK, Noble County, OK, Nowata 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, Tulsa County, OK, Wagoner County, OK, Washington County, OK

The radar

The Norman radar (KTLX), 16 km from the middle of the area, began a volume at 22:01 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, 10.0 hours before the alert went out and 33 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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.

Issued	Product	Office	Counties	Lasted
May 30, 8:09 PM CDT	Mesoscale Discussion	SPC	Adair, Sequoyah	66 min
May 30, 8:46 PM CDT	Tornado Watch	SPC	Adair, Cherokee, Delaware, Haskell, LeFlore, Sequoyah	7 hr
May 30, 9:03 PM CDT	Mesoscale Discussion	SPC	Carter, Coal, Garvin, Hughes, Johnston, McIntosh and 6 more	57 min
May 30, 11:28 PM CDT	Mesoscale Discussion	SPC	Adair, LeFlore, Sequoyah	2 hr
May 31, 1:57 AM CDT	Mesoscale Discussion	SPC	LeFlore	93 min
May 31, 1:49 PM CDT	Mesoscale Discussion	SPC	Craig, Delaware, Nowata, Ottawa	116 min
May 31, 2:40 PM CDT	Mesoscale Discussion	SPC	Blaine, Caddo, Canadian, Carter, Cleveland, Comanche and 29 more	95 min
May 31, 3:27 PM CDT	Tornado Watch PDS	SPC	Blaine, Caddo, Canadian, Carter, Cleveland, Comanche and 36 more	9 hr
May 31, 6:33 PM CDT	Mesoscale Discussion	SPC	Canadian, Cleveland, Kingfisher, Logan, Noble, Oklahoma and 3 more	27 min

Nearby

Mesoscale Discussions in Oklahoma, 2013 Every 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.