Alert archive / Arkansas / Mesoscale Discussions in 2016

Mesoscale Discussion 580

May 9, 201632 counties in Arkansas; 4 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 9, 2016, 11:15 PM CDT for 32 counties in Arkansas; 4 counties in Texas. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued: May 9, 2016, 11:15 PM CDT (04:15 UTC)
Expired: May 10, 2016, 12:45 AM CDT
In force: 90 min
Issued by: the Storm Prediction Center

All 36 counties

Arkansas County, AR, Bradley County, AR, Calhoun County, AR, Clark County, AR, Cleburne County, AR, Cleveland County, AR, Columbia County, AR, Craighead County, AR, Cross 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, Lafayette County, AR, Lawrence County, AR, Lincoln County, AR, Lonoke County, AR, Miller County, AR, Monroe County, AR, Nevada County, AR, Ouachita County, AR, Poinsett County, AR, Prairie County, AR, Pulaski County, AR, Saline County, AR, St. Francis County, AR, White County, AR, Woodruff County, AR, Bowie County, TX, Cass County, TX, Morris County, TX, Titus County, TX

The radar

The Little Rock radar (KLZK), 32 km from the middle of the area, began a volume at 04:14 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 (KBYH), launched 00:00Z, 4.3 hours before the alert went out and 233 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: 606 J/kg
Mixed-layer CIN: -24 J/kg
Mixed-layer LCL: 834 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 289 m²/s²
0-3 km storm-relative helicity: 399 m²/s²
Significant tornado parameter: 1.1
Supercell composite: 15.6

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 9, 7:23 PM CDT	Tornado Watch	SPC	Arkansas, Bradley, Calhoun, Clark, Clay, Cleburne and 53 more	8 hr
May 9, 8:01 PM CDT	Mesoscale Discussion	SPC	Bradley, Calhoun, Clark, Cleburne, Cleveland, Columbia and 32 more	89 min
May 9, 10:37 PM CDT	Mesoscale Discussion	SPC	Benton, Carroll	83 min
May 10, 1:42 AM CDT	Mesoscale Discussion	SPC	Ashley, Chicot, Desha, Drew	93 min
May 10, 1:56 PM CDT	Mesoscale Discussion	SPC	Bosque, Brown, Burnet, Coleman, Collin, Comanche and 45 more	2 hr
May 10, 2:39 PM CDT	Severe Thunderstorm Watch	SPC	Bandera, Bell, Blanco, Bosque, Brown, Burnet and 63 more	7 hr
May 10, 6:39 PM CDT	Mesoscale Discussion	SPC	Bandera, Bell, Blanco, Bosque, Brown, Burnet and 61 more	96 min

Nearby

Mesoscale Discussions in Arkansas, 2016 Mesoscale Discussions in Texas, 2016 Every mesoscale discussion in 2016

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.