Alert archive / Alabama / Mesoscale Discussions in 2011

Mesoscale Discussion 2356

November 22, 201119 counties in Alabama; Greene County, Mississippi

The Storm Prediction Center issued this mesoscale discussion at Nov 22, 2011, 2:40 PM CST for 19 counties in Alabama; Greene County, Mississippi. It was in force for 65 min.

The area

The outline as issued.

The facts

Issued: Nov 22, 2011, 2:40 PM CST (20:40 UTC)
Expired: Nov 22, 2011, 3:45 PM CST
In force: 65 min
Issued by: the Storm Prediction Center

Counties Autauga County, AL, Bibb County, AL, Butler County, AL, Chilton County, AL, Choctaw County, AL, Clarke County, AL, Conecuh County, AL, Dallas County, AL, Greene County, AL, Hale County, AL, Jefferson County, AL, Lowndes County, AL, Marengo County, AL, Monroe County, AL, Perry County, AL, Shelby County, AL, Tuscaloosa County, AL, Washington County, AL, Wilcox County, AL, Greene County, MS

The radar

The Birmingham radar (KBMX), 141 km from the middle of the area, began a volume at 20:42 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

Birmingham, AL (KBMX), launched 12:00Z, 8.7 hours before the alert went out and 142 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1114 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 197 m²/s²
0-3 km storm-relative helicity: 207 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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.

Issued	Product	Office	Counties	Lasted
Nov 22, 11:38 AM CST	Mesoscale Discussion	SPC	Autauga, Bibb, Butler, Chilton, Choctaw, Clarke and 18 more	37 min
Nov 22, 11:58 AM CST	Tornado Watch	SPC	Autauga, Barbour, Bibb, Bullock, Butler, Chambers and 28 more	8 hr
Nov 22, 12:49 PM CST	Mesoscale Discussion	SPC	Blount, Cherokee, DeKalb, Etowah, Jackson, Marshall	116 min
Nov 22, 3:24 PM CST	Mesoscale Discussion	SPC	Barbour, Bullock, Chambers, Clay, Dale, Elmore and 8 more	2 hr
Nov 22, 10:26 AM CST	Mesoscale Discussion	SPC	Adams, Amite, Copiah, Franklin, Jefferson, Jefferson Davis and 7 more	94 min

Nearby

Mesoscale Discussions in Alabama, 2011 Mesoscale Discussions in Mississippi, 2011 Every mesoscale discussion in 2011

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.