Alert archive / Mississippi / Mesoscale Discussions in 2016

Mesoscale Discussion 1834

November 28, 20164 counties in Alabama; Saint Helena Parish, Tangipahoa Parish, Washington Parish, Louisiana; 17 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Nov 28, 2016, 6:36 PM CST for 4 counties in Alabama; Saint Helena Parish, Tangipahoa Parish, Washington Parish, Louisiana; 17 counties in Mississippi. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Nov 28, 2016, 6:36 PM CST (00:36 UTC)
Expired
Nov 28, 2016, 9:00 PM CST
In force
2 hr
Issued by
the Storm Prediction Center
Chance of a watch
40%
All 24 counties

Choctaw County, AL, Clarke County, AL, Monroe County, AL, Washington County, AL, Saint Helena Parish, LA, Tangipahoa Parish, LA, Washington Parish, LA, Clarke County, MS, Covington County, MS, Forrest County, MS, George County, MS, Greene County, MS, Jasper County, MS, Jefferson Davis County, MS, Jones County, MS, Lamar County, MS, Lawrence County, MS, Marion County, MS, Pearl River County, MS, Perry County, MS, Pike County, MS, Stone County, MS, Walthall County, MS, Wayne County, MS

The radar

The Mobile radar (KMOB), 115 km from the middle of the area, began a volume at 00:37 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 0.6 hours before the alert went out and 121 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 2016-11-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 518 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 2016-11-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 510 square meters per square second.1939587897117Sfc1 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
518 J/kg
Mixed-layer CIN
-9 J/kg
Mixed-layer LCL
650 m above ground
0-6 km bulk shear
82 kt
0-1 km storm-relative helicity
510 m²/s²
0-3 km storm-relative helicity
543 m²/s²
Significant tornado parameter
1.9
Supercell composite
6.4

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
Nov 28, 7:00 PM CSTMesoscale DiscussionSPCBibb, Blount, Chilton, Cullman, DeKalb, Etowah and 7 more90 min
Nov 28, 8:39 PM CSTMesoscale DiscussionSPCChoctaw, Washington96 min
Nov 28, 11:38 PM CSTMesoscale DiscussionSPCAutauga, Butler, Clarke, Dallas, Elmore, Lowndes and 5 more3 hr
Nov 29, 3:08 PM CSTMesoscale DiscussionSPCColbert, Franklin, Lamar, Lauderdale, Marion2 hr
Nov 29, 3:48 PM CSTTornado WatchSPCColbert, Franklin, Lauderdale7 hr
Nov 29, 4:46 PM CSTMesoscale DiscussionSPCFayette, Greene, Hale, Lamar, Marion, Pickens and 2 more2 hr
Nov 29, 5:24 PM CSTMesoscale DiscussionSPCColbert, Franklin, Jackson, Lauderdale, Lawrence, Limestone and 5 more96 min
Nov 29, 5:37 PM CSTTornado WatchSPCFayette, Greene, Hale, Lamar, Marion, Pickens and 4 more3 hr
Nov 29, 9:51 AM CSTMesoscale DiscussionSPCBienville, Caldwell, Catahoula, De Soto, Franklin, Grant and 10 more84 min
Nov 29, 12:38 PM CSTMesoscale DiscussionSPCAvoyelles, Caldwell, Catahoula, Concordia, East Carroll, Franklin and 13 more2 hr
Nov 29, 1:48 PM CSTTornado WatchSPCCaldwell, Catahoula, Concordia, East Carroll, Franklin, Grant and 12 more7 hr
Nov 29, 4:20 PM CSTMesoscale DiscussionSPCCaldwell, Catahoula, East Carroll, Franklin, LaSalle, Madison and 2 more55 min
Nov 29, 5:37 PM CSTMesoscale DiscussionSPCAcadia, Allen, Ascension, Avoyelles, Beauregard, Calcasieu and 12 more2 hr

Nearby

Mesoscale Discussions in Mississippi, 2016Mesoscale Discussions in Alabama, 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; radar from the NEXRAD Level II archive.