Alert archive / Arkansas / Mesoscale Discussions in 2015

Mesoscale Discussion 576

May 9, 201512 counties in Arkansas

The Storm Prediction Center issued this mesoscale discussion at May 9, 2015, 8:46 PM CDT for 12 counties in Arkansas. It was in force for 59 min.

The area

The outline as issued.

The facts

Issued: May 9, 2015, 8:46 PM CDT (01:46 UTC)
Expired: May 9, 2015, 9:45 PM CDT
In force: 59 min
Issued by: the Storm Prediction Center

Counties Calhoun County, AR, Clark County, AR, Cleveland County, AR, Columbia County, AR, Dallas County, AR, Grant County, AR, Hempstead County, AR, Hot Spring County, AR, Jefferson County, AR, Lincoln County, AR, Nevada County, AR, Ouachita County, AR

The radar

The Little Rock radar (KLZK), 129 km from the middle of the area, began a volume at 01:46 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

Shreveport, LA (KBAD), launched 00:00Z, 1.8 hours before the alert went out and 168 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: 566 J/kg
Mixed-layer CIN: -125 J/kg
Mixed-layer LCL: 1556 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 60 m²/s²
0-3 km storm-relative helicity: 261 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.4

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
May 10, 2:39 AM CDT	Mesoscale Discussion	SPC	Cleburne, Conway, Franklin, Independence, Jackson, Johnson and 4 more	66 min
May 10, 6:44 AM CDT	Mesoscale Discussion	SPC	Howard, Little River, Polk, Sevier	2 hr
May 10, 8:56 AM CDT	Mesoscale Discussion	SPC	Crawford, Polk, Sebastian	2 hr
May 10, 9:28 AM CDT	Tornado Watch	SPC	Benton, Boone, Carroll, Crawford, Franklin, Howard and 13 more	6 hr
May 10, 10:19 AM CDT	Tornado Watch	SPC	Howard, Little River, Sevier	13 hr
May 10, 11:25 AM CDT	Mesoscale Discussion	SPC	Clark, Cleburne, Conway, Dallas, Faulkner, Franklin and 26 more	2 hr
May 10, 12:58 PM CDT	Tornado Watch	SPC	Crawford, Franklin, Sebastian	10 hr
May 10, 2:42 PM CDT	Mesoscale Discussion	SPC	Little River	2 hr
May 10, 5:05 PM CDT	Mesoscale Discussion	SPC	Clay, Cleburne, Conway, Craighead, Cross, Faulkner and 19 more	115 min
May 10, 6:15 PM CDT	Mesoscale Discussion	SPC	Columbia, Hempstead, Howard, Lafayette, Little River, Miller and 2 more	90 min

Nearby

Mesoscale Discussions in Arkansas, 2015 Every mesoscale discussion in 2015

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.