Alert archive / Mississippi / Mesoscale Discussions in 2013

Mesoscale Discussion 620

May 10, 2013Mobile County, Washington County, Alabama; 5 parishes in Louisiana; 6 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at May 10, 2013, 7:04 AM CDT for Mobile County, Washington County, Alabama; 5 parishes in Louisiana; 6 counties in Mississippi. It was in force for 86 min.

The area

The outline as issued.

The facts

Issued: May 10, 2013, 7:04 AM CDT (12:04 UTC)
Expired: May 10, 2013, 8:30 AM CDT
In force: 86 min
Issued by: the Storm Prediction Center

Counties Mobile County, AL, Washington County, AL, Jefferson Parish, LA, Lafourche Parish, LA, Orleans Parish, LA, Plaquemines Parish, LA, Saint Bernard Parish, LA, George County, MS, Greene County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Stone County, MS

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 0.1 hours before the alert went out and 22 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: 951 J/kg
Mixed-layer CIN: -76 J/kg
Mixed-layer LCL: 609 m above ground
0-6 km bulk shear: 60 kt
0-1 km storm-relative helicity: 182 m²/s²
0-3 km storm-relative helicity: 242 m²/s²
Significant tornado parameter: 1.0
Supercell composite: 6.1

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 9, 9:41 PM CDT	Severe Thunderstorm Watch	SPC	Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Cameron and 14 more	8 hr
May 10, 2:09 AM CDT	Mesoscale Discussion	SPC	Ascension, Assumption, East Baton Rouge, East Feliciana, Iberville, Livingston and 10 more	66 min
May 10, 2:25 AM CDT	Severe Thunderstorm Watch	SPC	Ascension, Assumption, East Baton Rouge, East Feliciana, Iberia, Iberville and 19 more	8 hr
May 10, 4:32 AM CDT	Mesoscale Discussion	SPC	Ascension, Assumption, Jefferson, Lafourche, Livingston, Saint Charles and 7 more	88 min
May 10, 5:33 PM CDT	Mesoscale Discussion	SPC	Alcorn, Attala, Benton, Bolivar, Calhoun, Carroll and 30 more	117 min

Nearby

Mesoscale Discussions in Mississippi, 2013 Mesoscale Discussions in Louisiana, 2013 Mesoscale Discussions in Alabama, 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.