Alert archive / Alabama / Mesoscale Discussions in 2013

Mesoscale Discussion 94

January 30, 201342 counties in Alabama; 7 counties in Mississippi; 5 counties in Tennessee

The Storm Prediction Center issued this mesoscale discussion at Jan 30, 2013, 7:43 AM CST for 42 counties in Alabama; 7 counties in Mississippi; 5 counties in Tennessee. It was in force for 62 min.

The area

The outline as issued.

The facts

Issued
Jan 30, 2013, 7:43 AM CST (13:43 UTC)
Expired
Jan 30, 2013, 8:45 AM CST
In force
62 min
Issued by
the Storm Prediction Center
All 54 counties

Autauga County, AL, Barbour County, AL, Bibb County, AL, Blount County, AL, Bullock 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, Coosa County, AL, Crenshaw County, AL, Dallas County, AL, DeKalb County, AL, Elmore County, AL, Etowah County, AL, Greene County, AL, Hale County, AL, Jackson County, AL, Jefferson County, AL, Lee County, AL, Lowndes County, AL, Macon County, AL, Marengo County, AL, Marshall 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, Sumter County, AL, Talladega County, AL, Tallapoosa County, AL, Tuscaloosa County, AL, Washington County, AL, Wilcox County, AL, Clarke County, MS, Forrest County, MS, George County, MS, Greene County, MS, Perry County, MS, Stone County, MS, Wayne County, MS, Bledsoe County, TN, Cumberland County, TN, Grundy County, TN, Marion County, TN, Sequatchie County, TN

The radar

The Birmingham radar (KBMX), 25 km from the middle of the area, began a volume at 13:44 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, 1.7 hours before the alert went out and 26 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 2013-01-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 916 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 2013-01-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 296 square meters per square second.1939587897117136Sfc1 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
916 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
468 m above ground
0-6 km bulk shear
62 kt
0-1 km storm-relative helicity
296 m²/s²
0-3 km storm-relative helicity
364 m²/s²
Significant tornado parameter
1.9
Supercell composite
9.6

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
Jan 29, 9:49 PM CSTMesoscale DiscussionSPCColbert, Franklin, Lauderdale116 min
Jan 30, 1:31 AM CSTMesoscale DiscussionSPCBlount, Calhoun, Cherokee, Colbert, Cullman, DeKalb and 17 more29 min
Jan 30, 1:46 AM CSTTornado WatchSPCBlount, Colbert, Cullman, DeKalb, Fayette, Franklin and 16 more8 hr
Jan 30, 4:27 AM CSTMesoscale DiscussionSPCMobile, Washington93 min
Jan 30, 5:01 AM CSTMesoscale DiscussionSPCAutauga, Bibb, Bullock, Butler, Calhoun, Chambers and 26 more29 min
Jan 30, 5:15 AM CSTTornado WatchSPCAutauga, Baldwin, Barbour, Bibb, Bullock, Butler and 34 more7 hr
Jan 30, 10:09 AM CSTMesoscale DiscussionSPCBarbour, Bullock, Chambers, Clay, Cleburne, Crenshaw and 9 more96 min
Jan 30, 11:50 AM CSTMesoscale DiscussionSPCBullock, Chambers, Elmore, Lee, Macon, Montgomery and 3 more85 min
Jan 30, 12:19 PM CSTTornado WatchSPCBarbour, Bullock, Butler, Chambers, Coffee, Conecuh and 16 more9 hr
Jan 29, 7:31 PM CSTMesoscale DiscussionSPCAlcorn, Attala, Benton, Calhoun, Carroll, DeSoto and 26 more119 min
Jan 29, 8:11 PM CSTMesoscale DiscussionSPCBolivar, Coahoma, Issaquena, Sharkey, Sunflower, Tunica and 1 more94 min
Jan 29, 10:07 PM CSTTornado WatchSPCAdams, Alcorn, Attala, Benton, Calhoun, Carroll and 37 more6 hr
Jan 30, 3:03 AM CSTMesoscale DiscussionSPCAdams, Alcorn, Attala, Benton, Calhoun, Carroll and 41 more57 min
Jan 30, 3:45 AM CSTTornado WatchSPCAttala, Choctaw, Clarke, Clay, Copiah, Covington and 23 more4 hr
Jan 30, 4:51 AM CSTTornado WatchSPCAnderson, Bledsoe, Blount, Bradley, Campbell, Carter and 27 more7 hr
Jan 30, 6:38 AM CSTMesoscale DiscussionSPCAnderson, Bledsoe, Blount, Bradley, Campbell, Carter and 27 more97 min

Nearby

Mesoscale Discussions in Alabama, 2013Mesoscale Discussions in Mississippi, 2013Mesoscale Discussions in Tennessee, 2013Every mesoscale discussion in 2013

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.