Alert archive / Louisiana / Mesoscale Discussions in 2017

Mesoscale Discussion 325

March 24, 2017Ashley County, Chicot County, Arkansas; 13 parishes in Louisiana; 8 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Mar 24, 2017, 11:41 PM CDT for Ashley County, Chicot County, Arkansas; 13 parishes in Louisiana; 8 counties in Mississippi. It was in force for 64 min.

The area

The outline as issued.

The facts

Issued
Mar 24, 2017, 11:41 PM CDT (04:41 UTC)
Expired
Mar 25, 2017, 12:45 AM CDT
In force
64 min
Issued by
the Storm Prediction Center
Chance of a watch
80%
All 23 counties

Ashley County, AR, Chicot County, AR, Avoyelles Parish, LA, Caldwell Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, LaSalle Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Ouachita Parish, LA, Richland Parish, LA, Tensas Parish, LA, West Carroll Parish, LA, Adams County, MS, Claiborne County, MS, Humphreys County, MS, Issaquena County, MS, Jefferson County, MS, Sharkey County, MS, Warren County, MS, Washington County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 144 km from the middle of the area, began a volume at 04:42 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 00:00Z, 4.7 hours before the alert went out and 135 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 00:00Z on 2017-03-25Temperature 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 00:00Z on 2017-03-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 115 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
1553 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
115 m²/s²
0-3 km storm-relative helicity
206 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

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 24, 8:39 PM CDTMesoscale DiscussionSPCColumbia, Lafayette, Miller, Nevada, Ouachita66 min
Mar 24, 9:14 PM CDTSevere Thunderstorm WatchSPCArkansas, Bradley, Calhoun, Clark, Cleveland, Columbia and 13 more6 hr
Mar 24, 9:36 PM CDTMesoscale DiscussionSPCBaxter, Boone, Carroll, Clay, Cleburne, Conway and 29 more54 min
Mar 25, 12:05 AM CDTSevere Thunderstorm WatchSPCAshley, Chicot5 hr
Mar 25, 1:05 AM CDTMesoscale DiscussionSPCClay, Craighead, Crittenden, Cross, Greene, Lee and 4 more115 min
Mar 24, 9:23 PM CDTTornado WatchSPCCaldwell, De Soto, Grant, LaSalle, Natchitoches, Red River and 2 more6 hr
Mar 24, 9:58 PM CDTMesoscale DiscussionSPCAllen, Beauregard, Calcasieu, Evangeline, Jefferson Davis, Rapides and 2 more62 min
Mar 24, 10:28 PM CDTTornado WatchSPCAllen, Beauregard, Calcasieu, Evangeline, Jefferson Davis, Rapides and 1 more6 hr
Mar 25, 2:08 AM CDTMesoscale DiscussionSPCAcadia, Allen, Beauregard, Calcasieu, Cameron, Evangeline and 6 more67 min
Mar 25, 3:06 AM CDTMesoscale DiscussionSPCCatahoula, Concordia, East Carroll, Franklin, Madison, Richland and 1 more54 min
Mar 25, 5:25 AM CDTMesoscale DiscussionSPCAllen, Beauregard, Calcasieu, Vernon2 hr
Mar 25, 12:08 PM CDTMesoscale DiscussionSPCJefferson, Lafourche, Orleans, Plaquemines, Saint Bernard, Saint Charles and 1 more3 hr
Mar 25, 1:34 PM CDTMesoscale DiscussionSPCAttala, Calhoun, Carroll, Chickasaw, Choctaw, Grenada and 9 more116 min

Nearby

Mesoscale Discussions in Louisiana, 2017Mesoscale Discussions in Mississippi, 2017Mesoscale Discussions in Arkansas, 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.