Alert archive / Arkansas / Mesoscale Discussions in 2011

Mesoscale Discussion 2209

September 27, 201117 counties in Arkansas; East Carroll Parish, Morehouse Parish, West Carroll Parish, Louisiana; 16 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Sep 27, 2011, 1:36 AM CDT for 17 counties in Arkansas; East Carroll Parish, Morehouse Parish, West Carroll Parish, Louisiana; 16 counties in Mississippi. It was in force for 114 min.

The area

The outline as issued.

The facts

Issued: Sep 27, 2011, 1:36 AM CDT (06:36 UTC)
Expired: Sep 27, 2011, 3:30 AM CDT
In force: 114 min
Issued by: the Storm Prediction Center

All 36 counties

Ashley County, AR, Bradley County, AR, Calhoun County, AR, Chicot County, AR, Clark County, AR, Cleveland County, AR, Columbia County, AR, Dallas County, AR, Desha County, AR, Drew County, AR, Grant County, AR, Hempstead County, AR, Hot Spring County, AR, Lincoln County, AR, Nevada County, AR, Ouachita County, AR, Union County, AR, East Carroll Parish, LA, Morehouse Parish, LA, West Carroll Parish, LA, Attala County, MS, Bolivar County, MS, Carroll County, MS, Choctaw County, MS, Grenada County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Leake County, MS, Leflore County, MS, Madison County, MS, Montgomery County, MS, Sharkey County, MS, Sunflower County, MS, Washington County, MS, Yazoo County, MS

The radar

The Little Rock radar (KLZK), 176 km from the middle of the area, began a volume at 06:37 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

Jackson, MS (KJAN), launched 00:00Z, 6.6 hours before the alert went out and 179 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: 1630 J/kg
Mixed-layer CIN: -61 J/kg
Mixed-layer LCL: 638 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 97 m²/s²
0-3 km storm-relative helicity: 99 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.8

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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Nearby

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