Alert archive / Mississippi / Mesoscale Discussions in 2008

Mesoscale Discussion 554

April 4, 200811 counties in Alabama; 24 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Apr 4, 2008, 12:01 PM CDT for 11 counties in Alabama; 24 counties in Mississippi. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued
Apr 4, 2008, 12:01 PM CDT (17:01 UTC)
Expired
Apr 4, 2008, 1:30 PM CDT
In force
89 min
Issued by
the Storm Prediction Center
All 35 counties

Autauga County, AL, Bibb County, AL, Chilton County, AL, Choctaw County, AL, Dallas County, AL, Greene County, AL, Hale County, AL, Marengo County, AL, Perry County, AL, Shelby County, AL, Sumter County, AL, Amite County, MS, Clarke County, MS, Copiah County, MS, Covington County, MS, Forrest County, MS, Franklin County, MS, Hinds County, MS, Jasper County, MS, Jefferson Davis County, MS, Jones County, MS, Kemper County, MS, Lamar County, MS, Lauderdale County, MS, Lawrence County, MS, Lincoln County, MS, Marion County, MS, Newton County, MS, Pike County, MS, Rankin County, MS, Scott County, MS, Simpson County, MS, Smith County, MS, Walthall County, MS, Wayne County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 114 km from the middle of the area, began a volume at 17:02 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

Jackson, MS (KJAN), launched 12:00Z, 5.0 hours before the alert went out and 123 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, Jackson, MS at 12:00Z on 2008-04-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Jackson, MS at 12:00Z on 2008-04-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 311 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
0 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
311 m²/s²
0-3 km storm-relative helicity
311 m²/s²
Significant tornado parameter
0.0
Supercell composite
8.9

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 4, 1:28 AM CDTMesoscale DiscussionSPCColbert, Lauderdale2 hr
Apr 4, 2:46 AM CDTSevere Thunderstorm WatchSPCColbert, Franklin, Lauderdale, Lawrence, Limestone8 hr
Apr 4, 5:16 AM CDTMesoscale DiscussionSPCColbert, Franklin, Lauderdale, Lawrence, Limestone89 min
Apr 4, 7:55 AM CDTMesoscale DiscussionSPCBlount, Colbert, Cullman, Fayette, Franklin, Greene and 16 more2 hr
Apr 4, 9:48 AM CDTTornado WatchSPCAutauga, Bibb, Blount, Chilton, Choctaw, Clarke and 18 more9 hr
Apr 4, 12:33 PM CDTMesoscale DiscussionSPCChambers, Cleburne, Lee, Randolph87 min
Apr 4, 1:27 PM CDTTornado WatchSPCBarbour, Bullock, Calhoun, Chambers, Cherokee, Clay and 14 more9 hr
Apr 4, 3:17 PM CDTMesoscale DiscussionSPCAutauga, Bibb, Calhoun, Chambers, Chilton, Clay and 10 more88 min
Apr 4, 5:02 PM CDTMesoscale DiscussionSPCAutauga, Baldwin, Barbour, Bullock, Butler, Choctaw and 23 more88 min
Apr 4, 5:48 PM CDTTornado WatchSPCBaldwin, Butler, Choctaw, Clarke, Coffee, Conecuh and 11 more6 hr
Apr 3, 9:49 PM CDTMesoscale DiscussionSPCAlcorn, Benton, Coahoma, DeSoto, Marshall, Panola and 4 more86 min
Apr 3, 10:23 PM CDTSevere Thunderstorm WatchSPCBenton, Coahoma, DeSoto, Marshall, Panola, Quitman and 3 more4 hr
Apr 3, 11:19 PM CDTMesoscale DiscussionSPCAlcorn, Benton, Coahoma, DeSoto, Marshall, Panola and 4 more86 min
Apr 4, 3:55 AM CDTSevere Thunderstorm WatchSPCBolivar, Grenada, Leflore, Sunflower, Washington7 hr

Nearby

Mesoscale Discussions in Mississippi, 2008Mesoscale Discussions in Alabama, 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.