Alert archive / Mississippi / Mesoscale Discussions in 2014

Mesoscale Discussion 482

April 29, 2014Choctaw County, Washington County, Alabama; Tangipahoa Parish, Washington Parish, Louisiana; 20 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Apr 29, 2014, 6:01 PM CDT for Choctaw County, Washington County, Alabama; Tangipahoa Parish, Washington Parish, Louisiana; 20 counties in Mississippi. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued
Apr 29, 2014, 6:01 PM CDT (23:01 UTC)
Expired
Apr 29, 2014, 7:30 PM CDT
In force
89 min
Issued by
the Storm Prediction Center
All 24 counties

Choctaw County, AL, Washington County, AL, Tangipahoa Parish, LA, Washington Parish, LA, Clarke County, MS, Covington County, MS, Forrest County, MS, George County, MS, Greene County, MS, Jasper County, MS, Jefferson Davis County, MS, Jones County, MS, Kemper County, MS, Lamar County, MS, Lauderdale County, MS, Lawrence County, MS, Marion County, MS, Newton County, MS, Pearl River County, MS, Perry County, MS, Smith County, MS, Stone County, MS, Walthall County, MS, Wayne County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 117 km from the middle of the area, began a volume at 23:03 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, 11.0 hours before the alert went out and 126 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 2014-04-29Temperature 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 2014-04-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 42 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2070 m above ground
0-6 km bulk shear
70 kt
0-1 km storm-relative helicity
42 m²/s²
0-3 km storm-relative helicity
34 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 28, 7:12 PM CDTMesoscale DiscussionSPCColbert, Cullman, Fayette, Franklin, Jackson, Lamar and 10 more93 min
Apr 28, 7:59 PM CDTTornado WatchSPCAutauga, Baldwin, Barbour, Bibb, Blount, Bullock and 51 more11 hr
Apr 28, 9:34 PM CDTMesoscale DiscussionSPCAutauga, Bibb, Blount, Calhoun, Cherokee, Chilton and 23 more86 min
Apr 28, 10:53 PM CDTMesoscale DiscussionSPCBibb, Blount, Etowah, Jefferson, Marshall, St. Clair and 2 more97 min
Apr 28, 11:20 PM CDTMesoscale DiscussionSPCAutauga, Bibb, Blount, Calhoun, Cherokee, Chilton and 21 more85 min
Apr 29, 1:38 AM CDTMesoscale DiscussionSPCBaldwin, Barbour, Bullock, Butler, Chambers, Coffee and 18 more67 min
Apr 29, 1:56 AM CDTTornado WatchSPCCoffee, Dale, Geneva, Henry, Houston9 hr
Apr 29, 4:01 AM CDTMesoscale DiscussionSPCBarbour, Chambers, Dale, Geneva, Henry, Houston and 3 more89 min
Apr 29, 12:46 PM CDTTornado WatchSPCBaldwin, Mobile, Washington10 hr
Apr 29, 3:27 PM CDTMesoscale DiscussionSPCBibb, Blount, Choctaw, Colbert, Cullman, DeKalb and 20 more33 min
Apr 29, 3:56 PM CDTTornado WatchSPCBibb, Blount, Calhoun, Cherokee, Chilton, Colbert and 27 more4 hr
Apr 29, 3:58 PM CDTMesoscale DiscussionSPCClarke, Conecuh, Covington, Escambia, Monroe92 min
Apr 29, 6:55 PM CDTMesoscale DiscussionSPCBibb, Blount, Calhoun, Cullman, DeKalb, Etowah and 17 more95 min
Apr 29, 12:02 PM CDTMesoscale DiscussionSPCCatahoula, Concordia, East Baton Rouge, East Carroll, East Feliciana, Franklin and 7 more88 min

Nearby

Mesoscale Discussions in Mississippi, 2014Mesoscale Discussions in Alabama, 2014Mesoscale Discussions in Louisiana, 2014Every mesoscale discussion in 2014

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.