Alert archive / Mississippi / Mesoscale Discussions in 2016

Mesoscale Discussion 299

March 31, 20166 parishes in Louisiana; 25 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Mar 31, 2016, 3:04 AM CDT for 6 parishes in Louisiana; 25 counties in Mississippi. It was in force for 86 min.

The area

The outline as issued.

The facts

Issued
Mar 31, 2016, 3:04 AM CDT (08:04 UTC)
Expired
Mar 31, 2016, 4:30 AM CDT
In force
86 min
Issued by
the Storm Prediction Center
Chance of a watch
80%
All 31 counties

East Feliciana Parish, LA, Pointe Coupee Parish, LA, Saint Helena Parish, LA, Tangipahoa Parish, LA, Washington Parish, LA, West Feliciana Parish, LA, Amite County, MS, Clarke County, MS, Copiah County, MS, Covington County, MS, Forrest County, MS, Franklin County, MS, Jasper County, MS, Jefferson Davis County, MS, Jones County, MS, Kemper County, MS, Lamar County, MS, Lauderdale County, MS, Lawrence County, MS, Leake County, MS, Lincoln County, MS, Marion County, MS, Neshoba County, MS, Newton County, MS, Pearl River County, MS, Pike County, MS, Rankin County, MS, Scott County, MS, Simpson County, MS, Smith County, MS, Walthall 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

Slidell Radar S, LA (KSIL), launched 00:00Z, 8.1 hours before the alert went out and 118 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 2016-03-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 401 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 2016-03-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 270 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
401 J/kg
Mixed-layer CIN
-53 J/kg
Mixed-layer LCL
689 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
270 m²/s²
0-3 km storm-relative helicity
356 m²/s²
Significant tornado parameter
0.5
Supercell composite
5.6

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 30, 8:39 PM CDTMesoscale DiscussionSPCBienville, Bossier, Caddo, Caldwell, Claiborne, De Soto and 13 more96 min
Mar 30, 10:00 PM CDTTornado WatchSPCBienville, Caldwell, Catahoula, Claiborne, Concordia, East Carroll and 16 more6 hr
Mar 30, 11:30 PM CDTMesoscale DiscussionSPCCatahoula, Concordia, East Carroll, Franklin, Madison, Morehouse and 3 more60 min
Mar 31, 3:20 AM CDTTornado WatchSPCEast Baton Rouge, East Feliciana, Livingston, Pointe Coupee, Saint Helena, Saint Tammany and 4 more6 hr
Mar 31, 1:30 PM CDTMesoscale DiscussionSPCAvoyelles, Caldwell, Catahoula, Concordia, East Carroll, Franklin and 12 more2 hr
Mar 31, 2:05 PM CDTSevere Thunderstorm WatchSPCAvoyelles, Bienville, Caldwell, Catahoula, Claiborne, Concordia and 20 more8 hr
Mar 31, 3:30 PM CDTMesoscale DiscussionSPCAscension, East Baton Rouge, East Feliciana, Iberville, Livingston, Pointe Coupee and 6 more2 hr
Mar 31, 5:22 PM CDTMesoscale DiscussionSPCCaldwell, Catahoula, East Carroll, Franklin, Grant, Jackson and 9 more53 min
Mar 31, 7:47 AM CDTMesoscale DiscussionSPCCovington, Forrest, Greene, Jefferson Davis, Jones, Lamar and 3 more58 min
Mar 31, 8:43 AM CDTTornado WatchSPCGeorge, Greene, Perry, Stone5 hr
Mar 31, 10:26 AM CDTMesoscale DiscussionSPCCoahoma, DeSoto, Tate, Tunica3 hr
Mar 31, 2:35 PM CDTTornado WatchSPCAdams, Alcorn, Attala, Benton, Bolivar, Calhoun and 60 more7 hr
Mar 31, 4:47 PM CDTMesoscale DiscussionSPCAlcorn, Attala, Benton, Bolivar, Calhoun, Carroll and 55 more58 min
Mar 31, 5:58 PM CDTTornado WatchSPCWayne7 hr
Mar 31, 6:52 PM CDTMesoscale DiscussionSPCAlcorn, Calhoun, Chickasaw, Choctaw, Clarke, Clay and 29 more53 min

Nearby

Mesoscale Discussions in Mississippi, 2016Mesoscale Discussions in Louisiana, 2016Every mesoscale discussion in 2016

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.