Alert archive / Oklahoma / Mesoscale Discussions in 2011

Mesoscale Discussion 123

February 24, 20119 counties in Oklahoma; 4 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Feb 24, 2011, 7:47 AM CST for 9 counties in Oklahoma; 4 counties in Texas. It was in force for 118 min.

The area

The outline as issued.

The facts

Issued: Feb 24, 2011, 7:47 AM CST (13:47 UTC)
Expired: Feb 24, 2011, 9:45 AM CST
In force: 118 min
Issued by: the Storm Prediction Center

Counties Cleveland County, OK, Cotton County, OK, Garvin County, OK, Grady County, OK, Jefferson County, OK, McClain County, OK, Murray County, OK, Pottawatomie County, OK, Stephens County, OK, Archer County, TX, Clay County, TX, Throckmorton County, TX, Wichita County, TX

The radar

The Norman radar (KTLX), 87 km from the middle of the area, began a volume at 13:49 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, 1.8 hours before the alert went out and 70 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: 910 J/kg
Mixed-layer CIN: -20 J/kg
Mixed-layer LCL: 483 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 268 m²/s²
0-3 km storm-relative helicity: 220 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 5.0

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
Feb 23, 8:43 PM CST	Mesoscale Discussion	SPC	Craig, Nowata, Osage, Ottawa, Pawnee, Rogers and 1 more	62 min
Feb 24, 3:07 AM CST	Mesoscale Discussion	SPC	Alfalfa, Beckham, Blaine, Caddo, Canadian, Custer and 17 more	113 min
Feb 24, 4:10 AM CST	Severe Thunderstorm Watch	SPC	Beckham, Caddo, Canadian, Carter, Cleveland, Comanche and 17 more	7 hr
Feb 24, 10:34 AM CST	Mesoscale Discussion	SPC	Choctaw, Haskell, Latimer, LeFlore, McCurtain, Pushmataha	56 min
Feb 24, 11:25 AM CST	Tornado Watch	SPC	Adair, Choctaw, Haskell, Latimer, LeFlore, McCurtain and 3 more	9 hr
Feb 24, 2:39 PM CST	Mesoscale Discussion	SPC	Haskell, Latimer, LeFlore, McCurtain, Muskogee, Sequoyah	66 min
Feb 24, 5:26 PM CST	Mesoscale Discussion	SPC	Cass, Harrison, Marion, Panola, Rusk, Shelby	94 min

Nearby

Mesoscale Discussions in Oklahoma, 2011 Mesoscale Discussions in Texas, 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.