Alert archive / Alabama / Mesoscale Discussions in 2011

Mesoscale Discussion 276

March 26, 201130 counties in Alabama; Heard County, Georgia; 10 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Mar 26, 2011, 11:25 AM CDT for 30 counties in Alabama; Heard County, Georgia; 10 counties in Mississippi. It was in force for 95 min.

The area

The outline as issued.

The facts

Issued
Mar 26, 2011, 11:25 AM CDT (16:25 UTC)
Expired
Mar 26, 2011, 1:00 PM CDT
In force
95 min
Issued by
the Storm Prediction Center
All 41 counties

Autauga County, AL, Bibb County, AL, Blount County, AL, Calhoun County, AL, Chambers County, AL, Chilton County, AL, Clay County, AL, Cleburne County, AL, Coosa County, AL, Dallas County, AL, Elmore County, AL, Fayette County, AL, Greene County, AL, Hale County, AL, Jefferson County, AL, Lamar County, AL, Lee County, AL, Macon County, AL, Montgomery County, AL, Perry County, AL, Pickens County, AL, Randolph County, AL, Russell County, AL, Shelby County, AL, St. Clair County, AL, Sumter County, AL, Talladega County, AL, Tallapoosa County, AL, Tuscaloosa County, AL, Walker County, AL, Heard County, GA, Clay County, MS, Kemper County, MS, Lauderdale County, MS, Lowndes County, MS, Monroe County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Oktibbeha County, MS, Winston County, MS

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, 4.4 hours before the alert went out and 67 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 2011-03-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 54 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 2011-03-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 147 square meters per square second.19395878Sfc1 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
54 J/kg
Mixed-layer CIN
-256 J/kg
Mixed-layer LCL
809 m above ground
0-6 km bulk shear
54 kt
0-1 km storm-relative helicity
147 m²/s²
0-3 km storm-relative helicity
185 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

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
Mar 26, 10:21 AM CDTMesoscale DiscussionSPCAutauga, Bibb, Chambers, Chilton, Clay, Coosa and 17 more54 min
Mar 26, 12:15 PM CDTTornado WatchSPCAutauga, Barbour, Bibb, Blount, Bullock, Butler and 42 more8 hr
Mar 26, 2:23 PM CDTMesoscale DiscussionSPCAutauga, Barbour, Bibb, Blount, Bullock, Butler and 47 more97 min
Mar 26, 6:03 PM CDTMesoscale DiscussionSPCBlount, Cherokee, Cullman, DeKalb, Etowah, Franklin and 5 more27 min
Mar 26, 6:59 PM CDTMesoscale DiscussionSPCBarbour, Bullock, Calhoun, Chambers, Clay, Cleburne and 18 more91 min
Mar 26, 11:33 AM CDTMesoscale DiscussionSPCAtkinson, Bacon, Baker, Ben Hill, Berrien, Brooks and 18 more57 min
Mar 26, 2:38 PM CDTMesoscale DiscussionSPCAppling, Bacon, Bryan, Bulloch, Candler, Effingham and 11 more97 min
Mar 26, 6:40 PM CDTTornado WatchSPCBryan, Bulloch, Candler, Chatham, Effingham, Evans and 3 more4 hr
Mar 26, 2:27 PM CDTMesoscale DiscussionSPCAttala, Bolivar, Calhoun, Carroll, Chickasaw, Choctaw and 21 more63 min
Mar 26, 3:27 PM CDTTornado WatchSPCAttala, Bolivar, Calhoun, Carroll, Chickasaw, Choctaw and 27 more7 hr

Nearby

Mesoscale Discussions in Alabama, 2011Mesoscale Discussions in Mississippi, 2011Mesoscale Discussions in Georgia, 2011Every 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.