Alert archive / Alabama / Mesoscale Discussions in 2008

Mesoscale Discussion 643

April 11, 200813 counties in Alabama; 5 counties in Georgia; Wayne County, Mississippi

The Storm Prediction Center issued this mesoscale discussion at Apr 11, 2008, 7:48 PM CDT for 13 counties in Alabama; 5 counties in Georgia; Wayne County, Mississippi. It was in force for 57 min.

The area

The outline as issued.

The facts

Issued
Apr 11, 2008, 7:48 PM CDT (00:48 UTC)
Expired
Apr 11, 2008, 8:45 PM CDT
In force
57 min
Issued by
the Storm Prediction Center

Counties Autauga County, AL, Chambers County, AL, Chilton County, AL, Choctaw County, AL, Clay County, AL, Coosa County, AL, Dallas County, AL, Elmore County, AL, Marengo County, AL, Perry County, AL, Randolph County, AL, Tallapoosa County, AL, Wilcox County, AL, Carroll County, GA, Coweta County, GA, Fayette County, GA, Heard County, GA, Troup County, GA, Wayne County, MS

The radar

The Birmingham radar (KBMX), 67 km from the middle of the area, began a volume at 00:49 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, 0.8 hours before the alert went out and 68 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 00:00Z on 2008-04-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 635 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 00:00Z on 2008-04-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -86 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
635 J/kg
Mixed-layer CIN
-42 J/kg
Mixed-layer LCL
623 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
-86 m²/s²
0-3 km storm-relative helicity
-110 m²/s²
Significant tornado parameter
-0.4
Supercell composite
-2.4

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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Nearby

Mesoscale Discussions in Alabama, 2008Mesoscale Discussions in Georgia, 2008Mesoscale Discussions in Mississippi, 2008Every mesoscale discussion in 2008

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.