Alert archive / Mississippi / Mesoscale Discussions in 2017

Mesoscale Discussion 346

March 27, 20176 states

The Storm Prediction Center issued this mesoscale discussion at Mar 27, 2017, 3:33 PM CDT for 6 states. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued
Mar 27, 2017, 3:33 PM CDT (20:33 UTC)
Expired
Mar 27, 2017, 5:00 PM CDT
In force
87 min
Issued by
the Storm Prediction Center
All 97 counties

Bibb County, AL, Blount County, AL, Calhoun County, AL, Cherokee County, AL, Chilton County, AL, Clay County, AL, Cleburne County, AL, Cullman County, AL, DeKalb County, AL, Etowah County, AL, Fayette County, AL, Franklin County, AL, Greene County, AL, Hale County, AL, Jackson County, AL, Jefferson County, AL, Lamar County, AL, Lawrence County, AL, Limestone County, AL, Madison County, AL, Marion County, AL, Marshall County, AL, Morgan County, AL, Perry County, AL, Pickens County, AL, Shelby County, AL, St. Clair County, AL, Sumter County, AL, Talladega County, AL, Tuscaloosa County, AL, Walker County, AL, Winston County, AL, Chicot County, AR, Bartow County, GA, Catoosa County, GA, Chattooga County, GA, Dade County, GA, Floyd County, GA, Gordon County, GA, Haralson County, GA, Paulding County, GA, Polk County, GA, Walker County, GA, Whitfield County, GA, East Carroll Parish, LA, Madison Parish, LA, Tensas Parish, LA, West Carroll Parish, LA, Attala County, MS, Bolivar County, MS, Calhoun County, MS, Carroll County, MS, Chickasaw County, MS, Choctaw County, MS, Claiborne County, MS, Clay County, MS, Copiah County, MS, Franklin County, MS, Grenada County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Itawamba County, MS, Jasper County, MS, Jefferson County, MS, Kemper County, MS, Lauderdale County, MS, Lawrence County, MS, Leake County, MS, Lee County, MS, Leflore County, MS, Lincoln County, MS, Lowndes County, MS, Madison County, MS, Monroe County, MS, Montgomery County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Oktibbeha County, MS, Pontotoc County, MS, Rankin County, MS, Scott County, MS, Sharkey County, MS, Simpson County, MS, Smith County, MS, Sunflower County, MS, Tallahatchie County, MS, Warren County, MS, Washington County, MS, Webster County, MS, Winston County, MS, Yalobusha County, MS, Yazoo County, MS, Bradley County, TN, Hamilton County, TN

The radar

The Columbus AFB radar (KGWX), 84 km from the middle of the area, began a volume at 20:34 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 8.6 hours before the alert went out and 160 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 2017-03-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1037 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, Jackson, MS at 12:00Z on 2017-03-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 188 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
1037 J/kg
Mixed-layer CIN
-20 J/kg
Mixed-layer LCL
703 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
188 m²/s²
0-3 km storm-relative helicity
199 m²/s²
Significant tornado parameter
0.9
Supercell composite
4.9

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 27, 1:49 PM CDTMesoscale DiscussionSPCBibb, Blount, Calhoun, Cherokee, Chilton, Coosa and 19 more56 min
Mar 27, 1:54 PM CDTSevere Thunderstorm WatchSPCBibb, Blount, Calhoun, Cherokee, Cleburne, Colbert and 25 more7 hr
Mar 27, 5:59 PM CDTMesoscale DiscussionSPCLauderdale91 min
Mar 26, 8:49 PM CDTSevere Thunderstorm WatchSPCCrawford, Franklin, Howard, Little River, Logan, Miller and 4 more6 hr
Mar 27, 12:44 AM CDTMesoscale DiscussionSPCGarland, Hempstead, Howard, Lafayette, Little River, Logan and 8 more61 min
Mar 27, 11:26 AM CDTMesoscale DiscussionSPCClay, Craighead, Greene, Mississippi, Poinsett3 hr
Mar 27, 12:08 PM CDTSevere Thunderstorm WatchSPCCraighead, Crittenden, Cross, Lee, Mississippi, Phillips and 2 more8 hr
Mar 27, 3:39 PM CDTMesoscale DiscussionSPCCraighead, Crittenden, Cross, Lee, Mississippi, Phillips and 2 more2 hr
Mar 27, 4:43 PM CDTMesoscale DiscussionSPCCatoosa92 min
Mar 27, 5:02 PM CDTSevere Thunderstorm WatchSPCCatoosa, Chattooga, Dade, Floyd, Gordon, Murray and 2 more5 hr
Mar 27, 12:12 PM CDTMesoscale DiscussionSPCEast Carroll, Madison2 hr
Mar 27, 1:58 PM CDTMesoscale DiscussionSPCBedford, Benton, Cannon, Cheatham, Clay, Coffee and 34 more2 hr
Mar 27, 2:24 PM CDTSevere Thunderstorm WatchSPCBedford, Cannon, Cheatham, Clay, Coffee, Cumberland and 27 more8 hr

Nearby

Mesoscale Discussions in Mississippi, 2017Mesoscale Discussions in Alabama, 2017Mesoscale Discussions in Georgia, 2017Every mesoscale discussion in 2017

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.