Alert archive / Arkansas / Mesoscale Discussions in 2012

Mesoscale Discussion 2057

October 14, 201223 counties in Arkansas

The Storm Prediction Center issued this mesoscale discussion at Oct 14, 2012, 1:42 AM CDT for 23 counties in Arkansas. It was in force for 93 min.

The area

The outline as issued.

The facts

Issued: Oct 14, 2012, 1:42 AM CDT (06:42 UTC)
Expired: Oct 14, 2012, 3:15 AM CDT
In force: 93 min
Issued by: the Storm Prediction Center

All 23 counties

Arkansas County, AR, Calhoun County, AR, Clark County, AR, Cleburne County, AR, Cleveland County, AR, Dallas County, AR, Faulkner County, AR, Grant County, AR, Hempstead County, AR, Hot Spring County, AR, Independence County, AR, Jackson County, AR, Jefferson County, AR, Lincoln County, AR, Lonoke County, AR, Monroe County, AR, Nevada County, AR, Ouachita County, AR, Prairie County, AR, Pulaski County, AR, Saline County, AR, White County, AR, Woodruff County, AR

The radar

The Little Rock radar (KLZK), 52 km from the middle of the area, began a volume at 06:46 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 00:00Z, 6.7 hours before the alert went out and 237 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: 34 J/kg
Mixed-layer CIN: -105 J/kg
Mixed-layer LCL: 1039 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 146 m²/s²
0-3 km storm-relative helicity: 187 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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
Oct 13, 9:37 PM CDT	Mesoscale Discussion	SPC	Baxter, Benton, Boone, Carroll, Conway, Crawford and 24 more	113 min
Oct 13, 10:15 PM CDT	Severe Thunderstorm Watch	SPC	Baxter, Boone, Clark, Cleburne, Columbia, Conway and 30 more	6 hr
Oct 14, 3:19 AM CDT	Mesoscale Discussion	SPC	Arkansas, Bradley, Calhoun, Cleveland, Craighead, Cross and 15 more	26 min

Nearby

Mesoscale Discussions in Arkansas, 2012 Every mesoscale discussion in 2012

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.