Alert archive / Mississippi / Mesoscale Discussions in 2016

Mesoscale Discussion 228

March 17, 201618 parishes in Louisiana; 26 counties in Mississippi; Sabine County, Texas

The Storm Prediction Center issued this mesoscale discussion at Mar 17, 2016, 3:48 PM CDT for 18 parishes in Louisiana; 26 counties in Mississippi; Sabine County, Texas. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued
Mar 17, 2016, 3:48 PM CDT (20:48 UTC)
Expired
Mar 17, 2016, 5:15 PM CDT
In force
87 min
Issued by
the Storm Prediction Center
All 45 counties

Avoyelles Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, East Feliciana Parish, LA, Franklin Parish, LA, Grant Parish, LA, LaSalle Parish, LA, Natchitoches Parish, LA, Pointe Coupee Parish, LA, Rapides Parish, LA, Sabine Parish, LA, Saint Helena Parish, LA, Tangipahoa Parish, LA, Tensas Parish, LA, Vernon Parish, LA, Washington Parish, LA, West Feliciana Parish, LA, Winn Parish, LA, Adams County, MS, Amite County, MS, Claiborne County, MS, Copiah County, MS, Covington County, MS, Forrest County, MS, Franklin County, MS, George County, MS, Greene County, MS, Hinds County, MS, Jefferson County, MS, Jefferson Davis County, MS, Jones County, MS, Lamar County, MS, Lawrence County, MS, Lincoln County, MS, Marion County, MS, Pearl River County, MS, Perry County, MS, Pike County, MS, Simpson County, MS, Smith County, MS, Stone County, MS, Walthall County, MS, Wayne County, MS, Wilkinson County, MS, Sabine County, TX

The radar

The Ft Polk radar (KPOE), 146 km from the middle of the area, began a volume at 20:47 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, 8.8 hours before the alert went out and 161 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 2016-03-17Temperature 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 2016-03-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -25 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
1748 m above ground
0-6 km bulk shear
57 kt
0-1 km storm-relative helicity
-25 m²/s²
0-3 km storm-relative helicity
93 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 17, 9:37 AM CDTMesoscale DiscussionSPCBienville, Bossier, Caddo, Caldwell, Catahoula, Claiborne and 16 more83 min
Mar 17, 12:58 PM CDTMesoscale DiscussionSPCAllen, Avoyelles, Caldwell, Catahoula, Concordia, East Feliciana and 12 more92 min
Mar 17, 1:19 PM CDTSevere Thunderstorm WatchSPCAllen, Avoyelles, Beauregard, Bienville, Caldwell, Catahoula and 28 more9 hr
Mar 17, 6:22 PM CDTMesoscale DiscussionSPCAvoyelles, Bienville, Caddo, Caldwell, Catahoula, Concordia and 23 more53 min
Mar 17, 7:44 AM CDTMesoscale DiscussionSPCGeorge, Greene, Harrison, Jackson2 hr
Mar 17, 2:13 AM CDTMesoscale DiscussionSPCCollin, Cooke, Dallas, Denton, Grayson, Jack and 6 more3 hr
Mar 17, 5:57 AM CDTMesoscale DiscussionSPCCollin, Cooke, Dallas, Delta, Denton, Ellis and 13 more3 hr
Mar 17, 6:22 PM CDTMesoscale DiscussionSPCAtascosa, Austin, Bandera, Bastrop, Bexar, Brazos and 43 more2 hr

Nearby

Mesoscale Discussions in Mississippi, 2016Mesoscale Discussions in Louisiana, 2016Mesoscale Discussions in Texas, 2016Every mesoscale discussion in 2016

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.