Alert archive / Mississippi / Mesoscale Discussions in 2013

Mesoscale Discussion 294

March 23, 201318 counties in Alabama; 30 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Mar 23, 2013, 3:41 AM CDT for 18 counties in Alabama; 30 counties in Mississippi. It was in force for 64 min.

The area

The outline as issued.

The facts

Issued
Mar 23, 2013, 3:41 AM CDT (08:41 UTC)
Expired
Mar 23, 2013, 4:45 AM CDT
In force
64 min
Issued by
the Storm Prediction Center
Chance of a watch
20%
All 48 counties

Blount County, AL, Colbert County, AL, Cullman County, AL, Fayette County, AL, Franklin County, AL, Jefferson County, AL, Lamar County, AL, Lauderdale County, AL, Lawrence County, AL, Limestone County, AL, Marion County, AL, Marshall County, AL, Morgan County, AL, Pickens County, AL, Shelby County, AL, Tuscaloosa County, AL, Walker County, AL, Winston County, AL, Alcorn County, MS, Benton County, MS, Calhoun County, MS, Carroll County, MS, Chickasaw County, MS, Choctaw County, MS, Clay County, MS, Coahoma County, MS, Grenada County, MS, Itawamba County, MS, Lafayette County, MS, Lee County, MS, Leflore County, MS, Lowndes County, MS, Marshall County, MS, Monroe County, MS, Montgomery County, MS, Oktibbeha County, MS, Panola County, MS, Pontotoc County, MS, Prentiss County, MS, Quitman County, MS, Sunflower County, MS, Tallahatchie County, MS, Tate County, MS, Tippah County, MS, Tishomingo County, MS, Union County, MS, Webster County, MS, Yalobusha County, MS

The radar

The Columbus AFB radar (KGWX), 19 km from the middle of the area, began a volume at 08:43 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 00:00Z, 8.7 hours before the alert went out and 163 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 00:00Z on 2013-03-23Temperature 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, Birmingham, AL at 00:00Z on 2013-03-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 318 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
554 m above ground
0-6 km bulk shear
65 kt
0-1 km storm-relative helicity
318 m²/s²
0-3 km storm-relative helicity
425 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 23, 7:38 AM CDTMesoscale DiscussionSPCBaldwin, Covington, Escambia, Geneva, Mobile97 min
Mar 23, 12:35 PM CDTMesoscale DiscussionSPCBaldwin, Butler, Choctaw, Clarke, Conecuh, Covington and 8 more85 min
Mar 23, 12:56 PM CDTSevere Thunderstorm WatchSPCBaldwin, Barbour, Bullock, Butler, Choctaw, Clarke and 19 more9 hr
Mar 23, 2:52 PM CDTMesoscale DiscussionSPCBaldwin, Butler, Choctaw, Clarke, Coffee, Conecuh and 13 more83 min
Mar 23, 5:22 PM CDTMesoscale DiscussionSPCBaldwin, Butler, Choctaw, Clarke, Coffee, Conecuh and 13 more53 min
Mar 23, 6:24 PM CDTMesoscale DiscussionSPCAutauga, Bibb, Blount, Butler, Chilton, Choctaw and 24 more66 min
Mar 23, 6:42 PM CDTSevere Thunderstorm WatchSPCAutauga, Barbour, Bibb, Blount, Bullock, Calhoun and 33 more7 hr
Mar 23, 6:49 PM CDTMesoscale DiscussionSPCGreene, Lamar, Pickens, Sumter116 min
Mar 22, 8:16 PM CDTMesoscale DiscussionSPCAttala, Bolivar, Carroll, Choctaw, Claiborne, Copiah and 18 more119 min
Mar 23, 5:01 PM CDTMesoscale DiscussionSPCAdams, Attala, Carroll, Choctaw, Claiborne, Copiah and 28 more119 min
Mar 23, 5:21 PM CDTTornado WatchSPCAdams, Amite, Claiborne, Clarke, Copiah, Covington and 25 more6 hr
Mar 23, 5:45 PM CDTSevere Thunderstorm WatchSPCAttala, Bolivar, Calhoun, Carroll, Chickasaw, Choctaw and 29 more5 hr

Nearby

Mesoscale Discussions in Mississippi, 2013Mesoscale Discussions in Alabama, 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.