Alert archive / Alabama / Mesoscale Discussions in 2011

Mesoscale Discussion 314

March 29, 201133 counties in Alabama

The Storm Prediction Center issued this mesoscale discussion at Mar 29, 2011, 10:32 PM CDT for 33 counties in Alabama. It was in force for 58 min.

The area

The outline as issued.

The facts

Issued: Mar 29, 2011, 10:32 PM CDT (03:32 UTC)
Expired: Mar 29, 2011, 11:30 PM CDT
In force: 58 min
Issued by: the Storm Prediction Center

All 33 counties

Autauga County, AL, Bibb County, AL, Blount County, AL, Butler County, AL, Chilton County, AL, Choctaw County, AL, Clarke County, AL, Conecuh County, AL, Coosa County, AL, Cullman County, AL, Dallas County, AL, Fayette County, AL, Franklin County, AL, Greene County, AL, Hale County, AL, Jefferson County, AL, Lamar County, AL, Lawrence County, AL, Lowndes County, AL, Marengo County, AL, Marion County, AL, Monroe County, AL, Morgan County, AL, Perry County, AL, Pickens County, AL, Shelby County, AL, St. Clair County, AL, Sumter County, AL, Talladega County, AL, Tuscaloosa County, AL, Walker County, AL, Wilcox County, AL, Winston County, AL

The radar

The Birmingham radar (KBMX), 66 km from the middle of the area, began a volume at 03:33 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 00:00Z, 3.5 hours before the alert went out and 65 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: 2 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 479 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 77 m²/s²
0-3 km storm-relative helicity: 162 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
Mar 29, 9:42 PM CDT	Tornado Watch	SPC	Mobile, Washington	7 hr
Mar 30, 1:51 AM CDT	Mesoscale Discussion	SPC	Baldwin, Escambia, Mobile	114 min
Mar 30, 4:07 AM CDT	Tornado Watch	SPC	Baldwin, Escambia	6 hr

Nearby

Mesoscale Discussions in Alabama, 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.