Alert archive / Arkansas / Mesoscale Discussions in 2011

Mesoscale Discussion 1933

August 10, 201114 counties in Arkansas; Tunica County, Mississippi

The Storm Prediction Center issued this mesoscale discussion at Aug 10, 2011, 7:45 AM CDT for 14 counties in Arkansas; Tunica County, Mississippi. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued: Aug 10, 2011, 7:45 AM CDT (12:45 UTC)
Expired: Aug 10, 2011, 8:45 AM CDT
In force: 60 min
Issued by: the Storm Prediction Center

Counties Cleburne County, AR, Crittenden County, AR, Cross County, AR, Faulkner County, AR, Jackson County, AR, Lee County, AR, Lonoke County, AR, Monroe County, AR, Poinsett County, AR, Prairie County, AR, Pulaski County, AR, St. Francis County, AR, White County, AR, Woodruff County, AR, Tunica County, MS

The radar

The Little Rock radar (KLZK), 80 km from the middle of the area, began a volume at 12:47 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

Little Rock, AR (KLZK), launched 12:00Z, 0.8 hours before the alert went out and 140 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: 2536 J/kg
Mixed-layer CIN: -126 J/kg
Mixed-layer LCL: 1146 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 38 m²/s²
0-3 km storm-relative helicity: 140 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 3.7

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
Aug 10, 2:36 AM CDT	Mesoscale Discussion	SPC	Benton, Boone, Carroll, Crawford, Franklin, Johnson and 8 more	84 min
Aug 10, 3:15 AM CDT	Severe Thunderstorm Watch	SPC	Benton, Boone, Carroll, Cleburne, Conway, Crawford and 24 more	6 hr
Aug 10, 5:34 PM CDT	Mesoscale Discussion	SPC	Alcorn, Attala, Benton, Calhoun, Carroll, Chickasaw and 45 more	86 min

Nearby

Mesoscale Discussions in Arkansas, 2011 Mesoscale Discussions in Mississippi, 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.