Alert archive / Louisiana / Mesoscale Discussions in 2013

Mesoscale Discussion 216

February 25, 20134 states

The Storm Prediction Center issued this mesoscale discussion at Feb 25, 2013, 2:50 AM CST for 4 states. It was in force for 115 min.

The area

The outline as issued.

The facts

Issued: Feb 25, 2013, 2:50 AM CST (08:50 UTC)
Expired: Feb 25, 2013, 4:45 AM CST
In force: 115 min
Issued by: the Storm Prediction Center

Counties Baldwin County, AL, Mobile County, AL, Escambia County, FL, Santa Rosa County, FL, Jefferson Parish, LA, Lafourche Parish, LA, Orleans Parish, LA, Plaquemines Parish, LA, Saint Bernard Parish, LA, Saint Charles Parish, LA, Saint John the Baptist Parish, LA, Saint Tammany Parish, LA, Tangipahoa Parish, LA, Hancock County, MS, Harrison County, MS, Jackson County, MS, Pearl River County, MS, Stone County, MS

The radar

The Mobile radar (KMOB), 71 km from the middle of the area, began a volume at 08:53 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

Slidell Radar S, LA (KSIL), launched 00:00Z, 8.8 hours before the alert went out and 106 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 902 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 53 m²/s²
0-3 km storm-relative helicity: 160 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.6

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
Feb 24, 6:48 PM CST	Mesoscale Discussion	SPC	Baldwin, Mobile	87 min
Feb 25, 9:07 AM CST	Mesoscale Discussion	SPC	Baldwin, Escambia, Geneva, Mobile	2 hr
Feb 25, 2:52 PM CST	Mesoscale Discussion	SPC	Baldwin, Choctaw, Clarke, Conecuh, Covington, Escambia and 3 more	83 min
Feb 25, 3:54 PM CST	Tornado Watch	SPC	Baldwin, Choctaw, Clarke, Conecuh, Escambia, Mobile and 2 more	6 hr
Feb 25, 11:26 AM CST	Tornado Watch	SPC	Alachua, Baker, Bradford, Clay, Columbia, Dixie and 17 more	7 hr
Feb 25, 1:43 PM CST	Mesoscale Discussion	SPC	Alachua, Baker, Bradford, Clay, Columbia, Dixie and 11 more	62 min
Feb 25, 5:43 PM CST	Mesoscale Discussion	SPC	Alachua, Bradford, Clay, Duval, Flagler, Gilchrist and 5 more	62 min
Feb 24, 11:57 PM CST	Mesoscale Discussion	SPC	Ascension, Assumption, Iberia, Jefferson, Lafourche, Livingston and 9 more	63 min
Feb 25, 12:04 AM CST	Severe Thunderstorm Watch	SPC	Ascension, Assumption, East Baton Rouge, East Feliciana, Iberville, Jefferson and 14 more	8 hr
Feb 25, 9:25 AM CST	Mesoscale Discussion	SPC	Acadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 56 more	65 min
Feb 25, 12:26 PM CST	Tornado Watch	SPC	Acadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 58 more	10 hr
Feb 25, 2:15 PM CST	Mesoscale Discussion	SPC	Acadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 53 more	90 min

Nearby

Mesoscale Discussions in Louisiana, 2013 Mesoscale Discussions in Mississippi, 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; radar from the NEXRAD Level II archive.