Alert archive / Oklahoma / Mesoscale Discussions in 2011

Mesoscale Discussion 400

April 10, 201118 counties in Oklahoma; 13 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 10, 2011, 6:17 PM CDT for 18 counties in Oklahoma; 13 counties in Texas. It was in force for 58 min.

The area

The outline as issued.

The facts

Issued: Apr 10, 2011, 6:17 PM CDT (23:17 UTC)
Expired: Apr 10, 2011, 7:15 PM CDT
In force: 58 min
Issued by: the Storm Prediction Center

All 31 counties

Atoka County, OK, Carter County, OK, Cherokee County, OK, Coal County, OK, Delaware County, OK, Hughes County, OK, Johnston County, OK, Love County, OK, Marshall County, OK, Mayes County, OK, McIntosh County, OK, Murray County, OK, Muskogee County, OK, Okmulgee County, OK, Ottawa County, OK, Pittsburg County, OK, Pontotoc County, OK, Wagoner County, OK, Brown County, TX, Callahan County, TX, Coleman County, TX, Concho County, TX, Cooke County, TX, Eastland County, TX, Jack County, TX, Montague County, TX, Palo Pinto County, TX, Parker County, TX, Runnels County, TX, Tom Green County, TX, Wise County, TX

The radar

The Norman radar (KTLX), 117 km from the middle of the area, began a volume at 23:17 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

Fort Worth, TX (KFWD), launched 12:00Z, 11.3 hours before the alert went out and 164 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: 483 J/kg
Mixed-layer CIN: -670 J/kg
Mixed-layer LCL: 905 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 309 m²/s²
0-3 km storm-relative helicity: 332 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
Apr 9, 7:28 PM CDT	Mesoscale Discussion	SPC	Woods, Woodward	92 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.