Alert archive / Louisiana / Mesoscale Discussions in 2013

Mesoscale Discussion 196

February 21, 20136 parishes in Louisiana

The Storm Prediction Center issued this mesoscale discussion at Feb 21, 2013, 6:45 PM CST for 6 parishes in Louisiana. It was in force for 30 min.

The area

The outline as issued.

The facts

Issued
Feb 21, 2013, 6:45 PM CST (00:45 UTC)
Expired
Feb 21, 2013, 7:15 PM CST
In force
30 min
Issued by
the Storm Prediction Center

Counties Acadia Parish, LA, East Feliciana Parish, LA, Lafayette Parish, LA, Pointe Coupee Parish, LA, Saint Landry Parish, LA, West Feliciana Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 0.8 hours before the alert went out and 204 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 2013-02-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 421 joules per kilogram.LCLLFCEL10008507005003002001001 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 2013-02-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 640 square meters per square second.1939587897Sfc1 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
421 J/kg
Mixed-layer CIN
-16 J/kg
Mixed-layer LCL
524 m above ground
0-6 km bulk shear
62 kt
0-1 km storm-relative helicity
640 m²/s²
0-3 km storm-relative helicity
752 m²/s²
Significant tornado parameter
1.8
Supercell composite
11.8

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 22, 1:28 PM CSTMesoscale DiscussionSPCAvoyelles, Catahoula, Concordia, East Feliciana, Grant, LaSalle and 4 more62 min

Nearby

Mesoscale Discussions in Louisiana, 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.