Alert archive / Arkansas / Mesoscale Discussions in 2016

Mesoscale Discussion 493

April 29, 201611 counties in Arkansas

The Storm Prediction Center issued this mesoscale discussion at Apr 29, 2016, 7:06 AM CDT for 11 counties in Arkansas. It was in force for 54 min.

The area

The outline as issued.

The facts

Issued: Apr 29, 2016, 7:06 AM CDT (12:06 UTC)
Expired: Apr 29, 2016, 8:00 AM CDT
In force: 54 min
Issued by: the Storm Prediction Center

Counties Arkansas County, AR, Bradley County, AR, Calhoun County, AR, Clark County, AR, Cleveland County, AR, Dallas County, AR, Grant County, AR, Hot Spring County, AR, Jefferson County, AR, Lincoln County, AR, Ouachita County, AR

The radar

The Little Rock radar (KLZK), 99 km from the middle of the area, began a volume at 12:05 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 12:00Z, 0.1 hours before the alert went out and 210 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: 1756 J/kg
Mixed-layer CIN: -129 J/kg
Mixed-layer LCL: 632 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 310 m²/s²
0-3 km storm-relative helicity: 451 m²/s²
Significant tornado parameter: 0.9
Supercell composite: 14.9

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
Apr 29, 1:58 AM CDT	Mesoscale Discussion	SPC	Clark, Columbia, Dallas, Garland, Hempstead, Hot Spring and 11 more	2 hr
Apr 29, 4:21 AM CDT	Severe Thunderstorm Watch	SPC	Arkansas, Clark, Cleveland, Conway, Crawford, Dallas and 25 more	6 hr
Apr 29, 9:46 AM CDT	Mesoscale Discussion	SPC	Arkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 29 more	89 min
Apr 29, 12:51 PM CDT	Mesoscale Discussion	SPC	Bradley, Calhoun, Clark, Columbia, Hempstead, Howard and 8 more	114 min
Apr 29, 1:43 PM CDT	Tornado Watch	SPC	Bradley, Calhoun, Clark, Cleveland, Columbia, Dallas and 10 more	8 hr
Apr 29, 5:42 PM CDT	Mesoscale Discussion	SPC	Bradley, Calhoun, Clark, Cleveland, Columbia, Dallas and 11 more	93 min

Nearby

Mesoscale Discussions in Arkansas, 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.