Alert archive / Alabama / Mesoscale Discussions in 2003

Mesoscale Discussion 416

April 6, 200310 counties in Alabama; 8 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Apr 6, 2003, 2:56 PM CDT for 10 counties in Alabama; 8 counties in Mississippi. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Apr 6, 2003, 2:56 PM CDT (19:56 UTC)
Expired
Apr 6, 2003, 5:00 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center

Counties Bibb County, AL, Chilton County, AL, Dallas County, AL, Greene County, AL, Hale County, AL, Perry County, AL, Pickens County, AL, Shelby County, AL, Sumter County, AL, Tuscaloosa County, AL, Kemper County, MS, Lauderdale County, MS, Leake County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Scott 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, 7.9 hours before the alert went out and 152 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 2003-04-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 43 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 2003-04-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 220 square meters per square second.1939587897117Sfc1 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
43 J/kg
Mixed-layer CIN
-292 J/kg
Mixed-layer LCL
938 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
220 m²/s²
0-3 km storm-relative helicity
283 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.8

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
Apr 6, 9:19 AM CDTMesoscale DiscussionSPCLimestone, Madison116 min
Apr 6, 12:40 PM CDTMesoscale DiscussionSPCGreene, Hale, Marengo, Perry, Pickens, Sumter and 1 more2 hr
Apr 6, 1:20 PM CDTSevere Thunderstorm WatchSPCLauderdale6 hr
Apr 6, 1:35 PM CDTTornado WatchSPCBibb, Butler, Chilton, Choctaw, Clarke, Dallas and 8 more5 hr
Apr 6, 6:23 PM CDTMesoscale DiscussionSPCBibb, Blount, Choctaw, Cullman, Fayette, Franklin and 14 more97 min
Apr 6, 6:50 PM CDTTornado WatchSPCAutauga, Bibb, Chilton, Choctaw, Cullman, Dallas and 12 more6 hr
Apr 6, 7:38 AM CDTMesoscale DiscussionSPCAdams, Claiborne, Copiah, Franklin, Hinds, Issaquena and 5 more97 min
Apr 6, 7:50 AM CDTSevere Thunderstorm WatchSPCBolivar, Hinds, Holmes, Humphreys, Issaquena, Leflore and 5 more5 hr
Apr 6, 10:00 AM CDTMesoscale DiscussionSPCAttala, Bolivar, Carroll, Coahoma, Grenada, Hinds and 12 more2 hr
Apr 6, 10:20 AM CDTMesoscale DiscussionSPCAttala, Bolivar, Calhoun, Carroll, Chickasaw, Choctaw and 36 more55 min
Apr 6, 10:30 AM CDTTornado WatchSPCAdams, Attala, Carroll, Claiborne, Copiah, Covington and 23 more6 hr
Apr 6, 11:05 AM CDTSevere Thunderstorm WatchSPCAlcorn, Benton, Bolivar, Calhoun, Chickasaw, Coahoma and 15 more5 hr
Apr 6, 12:03 PM CDTMesoscale DiscussionSPCClaiborne, Issaquena, Warren117 min
Apr 6, 12:27 PM CDTMesoscale DiscussionSPCBenton, Coahoma, DeSoto, Lafayette, Marshall, Panola and 8 more2 hr
Apr 6, 3:45 PM CDTTornado WatchSPCAdams, Amite, Attala, Carroll, Claiborne, Copiah and 23 more5 hr
Apr 6, 5:35 PM CDTMesoscale DiscussionSPCAdams, Amite, Attala, Carroll, Claiborne, Copiah and 25 more115 min

Nearby

Mesoscale Discussions in Alabama, 2003Mesoscale Discussions in Mississippi, 2003Every mesoscale discussion in 2003

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.