Alert archive / Arkansas / Mesoscale Discussions in 2013

Mesoscale Discussion 666

May 16, 2013Ashley County, Bradley County, Chicot County, Arkansas; Issaquena County, Sharkey County, Washington County, Mississippi

The Storm Prediction Center issued this mesoscale discussion at May 16, 2013, 10:59 PM CDT for Ashley County, Bradley County, Chicot County, Arkansas; Issaquena County, Sharkey County, Washington County, Mississippi. It was in force for 61 min.

The area

The outline as issued.

The facts

Issued: May 16, 2013, 10:59 PM CDT (03:59 UTC)
Expired: May 17, 2013, 12:00 AM CDT
In force: 61 min
Issued by: the Storm Prediction Center

Counties Ashley County, AR, Bradley County, AR, Chicot County, AR, Issaquena County, MS, Sharkey County, MS, Washington County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 177 km from the middle of the area, began a volume at 04:01 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, 4.0 hours before the alert went out and 167 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: 52 J/kg
Mixed-layer CIN: -126 J/kg
Mixed-layer LCL: 1338 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 120 m²/s²
0-3 km storm-relative helicity: 178 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
May 16, 7:24 PM CDT	Mesoscale Discussion	SPC	Ashley, Bradley, Calhoun, Chicot, Drew, Union	96 min
May 16, 7:59 PM CDT	Tornado Watch	SPC	Ashley, Chicot, Union	4 hr
May 17, 4:00 PM CDT	Mesoscale Discussion	SPC	Ashley, Bradley, Calhoun, Chicot, Cleveland, Columbia and 5 more	60 min
May 17, 1:39 PM CDT	Mesoscale Discussion	SPC	Attala, Carroll, Choctaw, Clarke, Clay, Holmes and 18 more	96 min
May 17, 5:45 PM CDT	Mesoscale Discussion	SPC	Kemper, Lauderdale, Noxubee	60 min

Nearby

Mesoscale Discussions in Arkansas, 2013 Mesoscale Discussions in Mississippi, 2013 Every mesoscale discussion in 2013

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.