Alert archive / Mississippi / Mesoscale Discussions in 2016

Mesoscale Discussion 1840

November 29, 20165 counties in Alabama; 23 counties in Mississippi; 6 counties in Tennessee

The Storm Prediction Center issued this mesoscale discussion at Nov 29, 2016, 3:08 PM CST for 5 counties in Alabama; 23 counties in Mississippi; 6 counties in Tennessee. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Nov 29, 2016, 3:08 PM CST (21:08 UTC)
Expired
Nov 29, 2016, 5:15 PM CST
In force
2 hr
Issued by
the Storm Prediction Center
Chance of a watch
60%
All 34 counties

Colbert County, AL, Franklin County, AL, Lamar County, AL, Lauderdale County, AL, Marion County, AL, Alcorn County, MS, Benton County, MS, Bolivar County, MS, Calhoun County, MS, Chickasaw County, MS, Clay County, MS, Grenada County, MS, Itawamba County, MS, Lafayette County, MS, Lee County, MS, Marshall County, MS, Monroe County, MS, Panola County, MS, Pontotoc County, MS, Prentiss County, MS, Quitman County, MS, Tallahatchie County, MS, Tate County, MS, Tippah County, MS, Tishomingo County, MS, Union County, MS, Webster County, MS, Yalobusha County, MS, Chester County, TN, Hardeman County, TN, Hardin County, TN, Lawrence County, TN, McNairy County, TN, Wayne County, TN

The radar

The Columbus AFB radar (KGWX), 101 km from the middle of the area, began a volume at 21:08 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 watches that followed

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

The nearest sounding before it

Little Rock, AR (KBYH), launched 12:00Z, 9.1 hours before the alert went out and 81 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, Little Rock, AR at 12:00Z on 2016-11-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Little Rock, AR at 12:00Z on 2016-11-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 180 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1496 m above ground
0-6 km bulk shear
92 kt
0-1 km storm-relative helicity
180 m²/s²
0-3 km storm-relative helicity
338 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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, 6:36 PM CSTMesoscale DiscussionSPCChoctaw, Clarke, Monroe, Washington2 hr
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, 3:48 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, 12:38 PM CSTMesoscale DiscussionSPCAdams, Amite, Claiborne, Copiah, Covington, Franklin and 18 more2 hr
Nov 29, 1:48 PM CSTTornado WatchSPCAdams, Attala, Bolivar, Carroll, Choctaw, Claiborne and 27 more7 hr
Nov 29, 4:20 PM CSTMesoscale DiscussionSPCAttala, Carroll, Choctaw, Claiborne, Copiah, Hinds and 17 more55 min

Nearby

Mesoscale Discussions in Mississippi, 2016Mesoscale Discussions in Tennessee, 2016Mesoscale Discussions in Alabama, 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.