Alert archive / Texas / Mesoscale Discussions in 2011

Mesoscale Discussion 1944

August 11, 2011Choctaw County, McCurtain County, Oklahoma; 20 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Aug 11, 2011, 2:13 PM CDT for Choctaw County, McCurtain County, Oklahoma; 20 counties in Texas. It was in force for 62 min.

The area

The outline as issued.

The facts

Issued: Aug 11, 2011, 2:13 PM CDT (19:13 UTC)
Expired: Aug 11, 2011, 3:15 PM CDT
In force: 62 min
Issued by: the Storm Prediction Center

All 22 counties

Choctaw County, OK, McCurtain County, OK, Collin County, TX, Dallas County, TX, Delta County, TX, Denton County, TX, Fannin County, TX, Grayson County, TX, Haskell County, TX, Hopkins County, TX, Hunt County, TX, Jones County, TX, Lamar County, TX, Palo Pinto County, TX, Parker County, TX, Red River County, TX, Rockwall County, TX, Shackelford County, TX, Stephens County, TX, Stonewall County, TX, Tarrant County, TX, Wise County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 95 km from the middle of the area, began a volume at 19:13 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, 7.2 hours before the alert went out and 199 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: 1518 J/kg
Mixed-layer CIN: -228 J/kg
Mixed-layer LCL: 1531 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 147 m²/s²
0-3 km storm-relative helicity: 161 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 6.0

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 10, 7:23 PM CDT	Mesoscale Discussion	SPC	Adair, Cherokee, Creek, Haskell, Hughes, Latimer and 12 more	97 min
Aug 11, 3:15 AM CDT	Mesoscale Discussion	SPC	Alfalfa, Beaver, Beckham, Blaine, Custer, Dewey and 11 more	90 min
Aug 11, 5:06 PM CDT	Mesoscale Discussion	SPC	Armstrong, Bailey, Briscoe, Castro, Cochran, Crosby and 15 more	84 min

Nearby

Mesoscale Discussions in Texas, 2011 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.