Alert archive / Mississippi / Mesoscale Discussions in 2015

Mesoscale Discussion 2049

December 23, 201518 counties in Alabama; 25 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Dec 23, 2015, 5:12 PM CST for 18 counties in Alabama; 25 counties in Mississippi. It was in force for 63 min.

The area

The outline as issued.

The facts

Issued
Dec 23, 2015, 5:12 PM CST (23:12 UTC)
Expired
Dec 23, 2015, 6:15 PM CST
In force
63 min
Issued by
the Storm Prediction Center
All 43 counties

Autauga County, AL, Bibb County, AL, Butler County, AL, Chilton County, AL, Choctaw County, AL, Clarke County, AL, Dallas County, AL, Elmore County, AL, Greene County, AL, Hale County, AL, Lowndes County, AL, Marengo County, AL, Monroe County, AL, Montgomery County, AL, Perry County, AL, Sumter County, AL, Washington County, AL, Wilcox County, AL, 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, Kemper County, MS, Lamar County, MS, Lauderdale County, MS, Lawrence County, MS, Leake County, MS, Marion County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Perry County, MS, Rankin County, MS, Scott County, MS, Simpson County, MS, Smith County, MS, Stone County, MS, Walthall County, MS, Wayne County, MS

The radar

The Mobile radar (KMOB), 108 km from the middle of the area, began a volume at 23:14 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

Jackson, MS (KJAN), launched 12:00Z, 11.2 hours before the alert went out and 158 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 2015-12-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 57 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 2015-12-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 298 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
57 J/kg
Mixed-layer CIN
-183 J/kg
Mixed-layer LCL
670 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
298 m²/s²
0-3 km storm-relative helicity
382 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.0

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
Dec 23, 11:42 AM CSTMesoscale DiscussionSPCBarbour, Bullock, Coffee, Covington, Crenshaw, Dale and 4 more93 min
Dec 23, 1:33 PM CSTMesoscale DiscussionSPCAutauga, Chilton, Choctaw, Clarke, Dallas, Greene and 7 more57 min
Dec 23, 2:17 PM CSTTornado WatchSPCAutauga, Bibb, Chilton, Choctaw, Clarke, Dallas and 11 more6 hr
Dec 23, 2:49 PM CSTMesoscale DiscussionSPCLauderdale86 min
Dec 23, 4:26 PM CSTMesoscale DiscussionSPCBlount, Colbert, Cullman, Franklin, Jackson, Lauderdale and 7 more64 min
Dec 23, 4:49 PM CSTTornado WatchSPCColbert, Cullman, Franklin, Lauderdale, Lawrence, Limestone and 2 more6 hr
Dec 23, 2:34 AM CSTMesoscale DiscussionSPCAdams, Amite, Claiborne, Copiah, Covington, Franklin and 20 more86 min
Dec 23, 10:58 AM CSTMesoscale DiscussionSPCAlcorn, Benton, Bolivar, Calhoun, Carroll, Chickasaw and 20 more2 hr
Dec 23, 11:57 AM CSTTornado Watch PDSSPCAlcorn, Benton, Bolivar, Calhoun, Carroll, Chickasaw and 29 more9 hr
Dec 23, 12:48 PM CSTMesoscale DiscussionSPCBenton, Bolivar, Coahoma, DeSoto, Grenada, Humphreys and 13 more57 min

Nearby

Mesoscale Discussions in Mississippi, 2015Mesoscale Discussions in Alabama, 2015Every mesoscale discussion in 2015

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.