Alert archive / Alabama / Mesoscale Discussions in 2016

Mesoscale Discussion 1856

November 30, 201643 counties in Alabama; 27 counties in Georgia; 4 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Nov 30, 2016, 9:00 AM CST for 43 counties in Alabama; 27 counties in Georgia; 4 counties in Mississippi. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Nov 30, 2016, 9:00 AM CST (15:00 UTC)
Expired
Nov 30, 2016, 11:00 AM CST
In force
2 hr
Issued by
the Storm Prediction Center
All 74 counties

Autauga County, AL, Baldwin County, AL, Bibb County, AL, Blount County, AL, Bullock County, AL, Butler County, AL, Calhoun County, AL, Chambers County, AL, Cherokee County, AL, Chilton County, AL, Choctaw County, AL, Clarke County, AL, Clay County, AL, Cleburne County, AL, Coffee County, AL, Conecuh County, AL, Coosa County, AL, Covington County, AL, Crenshaw County, AL, Dallas County, AL, DeKalb County, AL, Elmore County, AL, Escambia County, AL, Etowah County, AL, Hale County, AL, Jefferson County, AL, Lee County, AL, Lowndes County, AL, Macon County, AL, Marengo County, AL, Mobile County, AL, Monroe County, AL, Montgomery County, AL, Perry County, AL, Pike County, AL, Randolph County, AL, Russell County, AL, Shelby County, AL, St. Clair County, AL, Talladega County, AL, Tallapoosa County, AL, Washington County, AL, Wilcox County, AL, Bartow County, GA, Carroll County, GA, Chattooga County, GA, Cherokee County, GA, Clayton County, GA, Cobb County, GA, Coweta County, GA, DeKalb County, GA, Douglas County, GA, Fayette County, GA, Floyd County, GA, Fulton County, GA, Gordon County, GA, Haralson County, GA, Harris County, GA, Heard County, GA, Henry County, GA, Meriwether County, GA, Muscogee County, GA, Paulding County, GA, Pike County, GA, Polk County, GA, Spalding County, GA, Talbot County, GA, Troup County, GA, Upson County, GA, Whitfield County, GA, George County, MS, Greene County, MS, Harrison County, MS, Jackson County, MS

The radar

The Maxwell AFB radar (KMXX), 38 km from the middle of the area, began a volume at 15:00 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

Birmingham, AL (KBMX), launched 12:00Z, 3.0 hours before the alert went out and 79 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, Birmingham, AL at 12:00Z on 2016-11-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 492 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, Birmingham, AL at 12:00Z on 2016-11-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 288 square meters per square second.1939587897Sfc1 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
492 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
638 m above ground
0-6 km bulk shear
77 kt
0-1 km storm-relative helicity
288 m²/s²
0-3 km storm-relative helicity
321 m²/s²
Significant tornado parameter
1.0
Supercell composite
7.4

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 29, 6:43 PM CSTMesoscale DiscussionSPCColbert, Fayette, Franklin, Lamar, Lauderdale, Lawrence and 6 more92 min
Nov 29, 6:47 PM CSTTornado WatchSPCCullman, DeKalb, Jackson, Lawrence, Limestone, Madison and 2 more8 hr
Nov 29, 8:03 PM CSTMesoscale DiscussionSPCChoctaw, Fayette, Greene, Hale, Lamar, Pickens and 2 more2 hr
Nov 29, 8:50 PM CSTTornado WatchSPCBibb, Blount, Fayette, Greene, Hale, Jefferson and 7 more8 hr
Nov 29, 9:28 PM CSTMesoscale DiscussionSPCCullman, DeKalb, Jackson, Lawrence, Limestone, Madison and 2 more62 min
Nov 29, 10:28 PM CSTTornado WatchSPCColbert, Cullman, DeKalb, Franklin, Jackson, Lauderdale and 5 more5 hr
Nov 29, 11:17 PM CSTMesoscale DiscussionSPCDeKalb, Jackson, Lawrence, Limestone, Madison, Morgan118 min
Nov 29, 11:37 PM CSTMesoscale DiscussionSPCFayette, Lamar, Pickens113 min
Nov 30, 1:07 AM CSTMesoscale DiscussionSPCBlount, Cullman, DeKalb, Fayette, Jackson, Madison and 5 more53 min
Nov 30, 2:54 AM CSTTornado WatchSPCBibb, Blount, Calhoun, Cherokee, Chilton, Cleburne and 22 more7 hr
Nov 30, 4:57 AM CSTTornado WatchSPCChoctaw, Clarke, Mobile, Washington7 hr
Nov 30, 5:10 AM CSTMesoscale DiscussionSPCBibb, Blount, Calhoun, Cherokee, Chilton, Clay and 27 more95 min
Nov 30, 11:06 AM CSTTornado WatchSPCBaldwin, Barbour, Bullock, Butler, Chambers, Coffee and 17 more6 hr
Nov 30, 12:59 PM CSTMesoscale DiscussionSPCBarbour, Bullock, Coffee, Covington, Crenshaw, Dale and 7 more2 hr
Nov 30, 1:55 PM CSTMesoscale DiscussionSPCBarbour, Coffee, Covington, Dale, Geneva, Henry and 2 more2 hr
Nov 29, 10:11 PM CSTTornado WatchSPCCatoosa, Chattooga, Dade, Walker, Whitfield5 hr
Nov 30, 2:23 PM CSTSevere Thunderstorm WatchSPCBaldwin, Bibb, Bleckley, Columbia, Crisp, Dooly and 22 more3 hr
Nov 30, 4:43 PM CSTMesoscale DiscussionSPCColumbia, Elbert, Glascock, Hancock, Lincoln, McDuffie and 5 more92 min
Nov 30, 4:45 PM CSTMesoscale DiscussionSPCBaker, Calhoun, Decatur, Dougherty, Early, Grady and 7 more30 min
Nov 29, 6:06 PM CSTMesoscale DiscussionSPCAttala, Choctaw, Claiborne, Hinds, Holmes, Humphreys and 13 more114 min
Nov 29, 9:47 PM CSTMesoscale DiscussionSPCAdams, Amite, Claiborne, Copiah, Franklin, Hinds and 5 more58 min
Nov 30, 3:33 AM CSTMesoscale DiscussionSPCAmite, Clarke, Covington, Forrest, Hancock, Jasper and 17 more87 min

Nearby

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