Alert archive / Louisiana / Mesoscale Discussions in 2008

Mesoscale Discussion 2210

September 3, 2008Chicot County, Arkansas; 34 parishes in Louisiana; 17 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Sep 3, 2008, 10:42 AM CDT for Chicot County, Arkansas; 34 parishes in Louisiana; 17 counties in Mississippi. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Sep 3, 2008, 10:42 AM CDT (15:42 UTC)
Expired
Sep 3, 2008, 12:45 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 52 counties

Chicot County, AR, Acadia Parish, LA, Allen Parish, LA, Ascension Parish, LA, Assumption Parish, LA, Avoyelles Parish, LA, Calcasieu Parish, LA, Caldwell Parish, LA, Cameron Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, East Baton Rouge Parish, LA, East Carroll Parish, LA, East Feliciana Parish, LA, Evangeline Parish, LA, Franklin Parish, LA, Grant Parish, LA, Iberville Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, LaSalle Parish, LA, Livingston Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Pointe Coupee Parish, LA, Rapides Parish, LA, Richland Parish, LA, Saint Helena Parish, LA, Saint Landry Parish, LA, Saint Martin Parish, LA, Tensas Parish, LA, Vermilion Parish, LA, West Baton Rouge Parish, LA, West Carroll Parish, LA, West Feliciana Parish, LA, Adams County, MS, Amite County, MS, Bolivar County, MS, Claiborne County, MS, Copiah County, MS, Franklin County, MS, Hinds County, MS, Humphreys County, MS, Issaquena County, MS, Jefferson County, MS, Lincoln County, MS, Sharkey County, MS, Sunflower County, MS, Warren County, MS, Washington County, MS, Wilkinson County, MS, Yazoo County, MS

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 3.7 hours before the alert went out and 186 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 2008-09-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 842 joules per kilogram.LCLEL10008507005003002001001 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 2008-09-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 177 square meters per square second.193958Sfc1 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
842 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
505 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
177 m²/s²
0-3 km storm-relative helicity
188 m²/s²
Significant tornado parameter
0.8
Supercell composite
4.9

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
Sep 2, 11:15 PM CDTMesoscale DiscussionSPCBenton, Boone, Carroll, Crawford, Franklin, Johnson and 6 more3 hr
Sep 3, 12:39 PM CDTTornado WatchSPCAshley, Chicot, Union6 hr
Sep 3, 3:04 PM CDTMesoscale DiscussionSPCAshley, Chicot, Union116 min
Sep 3, 5:24 PM CDTMesoscale DiscussionSPCArkansas, Ashley, Chicot, Desha, Drew, Lee and 2 more96 min
Sep 3, 5:58 PM CDTTornado WatchSPCArkansas, Ashley, Chicot, Desha, Lee, Monroe and 2 more8 hr
Sep 2, 7:40 PM CDTMesoscale DiscussionSPCAscension, Avoyelles, Catahoula, Concordia, East Baton Rouge, East Carroll and 22 more2 hr
Sep 2, 11:36 PM CDTTornado WatchSPCAcadia, Allen, Avoyelles, Caldwell, Catahoula, Concordia and 13 more7 hr
Sep 3, 3:49 AM CDTMesoscale DiscussionSPCAllen, Avoyelles, Catahoula, Concordia, Evangeline, Franklin and 6 more116 min
Sep 3, 6:21 AM CDTTornado WatchSPCAcadia, Allen, Avoyelles, Caldwell, Catahoula, Concordia and 14 more6 hr

Nearby

Mesoscale Discussions in Louisiana, 2008Mesoscale Discussions in Mississippi, 2008Mesoscale Discussions in Arkansas, 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.