Alert archive / Oklahoma / Mesoscale Discussions in 2011

Mesoscale Discussion 1962

August 12, 201127 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Aug 12, 2011, 11:47 PM CDT for 27 counties in Oklahoma. It was in force for 88 min.

The area

The outline as issued.

The facts

Issued: Aug 12, 2011, 11:47 PM CDT (04:47 UTC)
Expired: Aug 13, 2011, 1:15 AM CDT
In force: 88 min
Issued by: the Storm Prediction Center

All 27 counties

Caddo County, OK, Cleveland County, OK, Coal County, OK, Comanche County, OK, Creek County, OK, Garvin County, OK, Grady County, OK, Haskell County, OK, Hughes County, OK, Kiowa County, OK, Latimer County, OK, Lincoln County, OK, Mayes County, OK, McClain County, OK, McIntosh County, OK, Muskogee County, OK, Okfuskee County, OK, Oklahoma County, OK, Okmulgee County, OK, Pittsburg County, OK, Pontotoc County, OK, Pottawatomie County, OK, Seminole County, OK, Stephens County, OK, Tillman County, OK, Tulsa County, OK, Wagoner County, OK

The radar

The Norman radar (KTLX), 42 km from the middle of the area, began a volume at 04:50 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 00:00Z, 4.8 hours before the alert went out and 52 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: 34 J/kg
Mixed-layer CIN: -393 J/kg
Mixed-layer LCL: 2505 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: -194 m²/s²
0-3 km storm-relative helicity: -181 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
Aug 12, 7:03 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Blaine, Garfield, Grant, Kay, Kingfisher and 8 more	117 min
Aug 12, 9:44 PM CDT	Severe Thunderstorm Watch	SPC	Blaine, Caddo, Canadian, Cleveland, Comanche, Creek and 29 more	5 hr

Nearby

Mesoscale Discussions in Oklahoma, 2011 Every 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.