Alert archive / Louisiana / Mesoscale Discussions in 2008

Mesoscale Discussion 2397

November 28, 200810 parishes in Louisiana; 5 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Nov 28, 2008, 11:56 AM CST for 10 parishes in Louisiana; 5 counties in Mississippi. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Nov 28, 2008, 11:56 AM CST (17:56 UTC)
Expired
Nov 28, 2008, 2:00 PM CST
In force
2 hr
Issued by
the Storm Prediction Center

Counties Avoyelles Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, Grant Parish, LA, LaSalle Parish, LA, Natchitoches Parish, LA, Rapides Parish, LA, Tensas Parish, LA, Vernon Parish, LA, Winn Parish, LA, Adams County, MS, Claiborne County, MS, Copiah County, MS, Franklin County, MS, Jefferson County, MS

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 5.9 hours before the alert went out and 185 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, Jackson, MS at 12:00Z on 2008-11-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 240 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, Jackson, MS at 12:00Z on 2008-11-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 36 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
240 J/kg
Mixed-layer CIN
-6 J/kg
Mixed-layer LCL
485 m above ground
0-6 km bulk shear
56 kt
0-1 km storm-relative helicity
36 m²/s²
0-3 km storm-relative helicity
113 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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
Nov 28, 3:16 PM CSTMesoscale DiscussionSPCAvoyelles, Catahoula, Concordia, East Feliciana, Grant, LaSalle and 6 more119 min
Nov 28, 5:33 PM CSTMesoscale DiscussionSPCAllen, Avoyelles, Beauregard, Concordia, East Baton Rouge, East Feliciana and 7 more57 min

Nearby

Mesoscale Discussions in Louisiana, 2008Mesoscale Discussions in Mississippi, 2008Every mesoscale discussion in 2008

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.