Alert archive / Louisiana / Mesoscale Discussions in 2013

Mesoscale Discussion 210

February 24, 2013Baldwin County, Mobile County, Alabama; 16 parishes in Louisiana; Hancock County, Harrison County, Jackson County, Mississippi

The Storm Prediction Center issued this mesoscale discussion at Feb 24, 2013, 6:48 PM CST for Baldwin County, Mobile County, Alabama; 16 parishes in Louisiana; Hancock County, Harrison County, Jackson County, Mississippi. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued
Feb 24, 2013, 6:48 PM CST (00:48 UTC)
Expired
Feb 24, 2013, 8:15 PM CST
In force
87 min
Issued by
the Storm Prediction Center
Chance of a watch
5%
All 21 counties

Baldwin County, AL, Mobile County, AL, Ascension Parish, LA, Assumption Parish, LA, Iberia Parish, LA, Iberville Parish, LA, Jefferson Parish, LA, Lafourche Parish, LA, Orleans Parish, LA, Plaquemines Parish, LA, Saint Bernard Parish, LA, Saint Charles Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Martin Parish, LA, Saint Tammany Parish, LA, St. Mary Parish, LA, Terrebonne Parish, LA, Hancock County, MS, Harrison County, MS, Jackson County, MS

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 0.8 hours before the alert went out and 28 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-pSkew-T log-p diagram, Slidell Radar S, LA at 00:00Z on 2013-02-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Slidell Radar S, LA at 00:00Z on 2013-02-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 53 square meters per square second.1939587897117136Sfc1 km3 km6 km9 kmRMLM
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.

IssuedProductOfficeCountiesLasted
Feb 25, 2:50 AM CSTMesoscale DiscussionSPCBaldwin, Mobile115 min
Feb 25, 9:07 AM CSTMesoscale DiscussionSPCBaldwin, Escambia, Geneva, Mobile2 hr
Feb 25, 2:52 PM CSTMesoscale DiscussionSPCBaldwin, Choctaw, Clarke, Conecuh, Covington, Escambia and 3 more83 min
Feb 25, 3:54 PM CSTTornado WatchSPCBaldwin, Choctaw, Clarke, Conecuh, Escambia, Mobile and 2 more6 hr
Feb 24, 11:57 PM CSTMesoscale DiscussionSPCAscension, Assumption, Iberia, Jefferson, Lafourche, Livingston and 9 more63 min
Feb 25, 12:04 AM CSTSevere Thunderstorm WatchSPCAscension, Assumption, East Baton Rouge, East Feliciana, Iberville, Jefferson and 14 more8 hr
Feb 25, 9:25 AM CSTMesoscale DiscussionSPCAcadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 56 more65 min
Feb 25, 12:26 PM CSTTornado WatchSPCAcadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 58 more10 hr
Feb 25, 2:15 PM CSTMesoscale DiscussionSPCAcadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 53 more90 min

Nearby

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