Alert archive / Mississippi / Mesoscale Discussions in 2014

Mesoscale Discussion 282

April 4, 201410 parishes in Louisiana; 27 counties in Mississippi; 5 counties in Tennessee

The Storm Prediction Center issued this mesoscale discussion at Apr 4, 2014, 3:45 AM CDT for 10 parishes in Louisiana; 27 counties in Mississippi; 5 counties in Tennessee. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued: Apr 4, 2014, 3:45 AM CDT (08:45 UTC)
Expired: Apr 4, 2014, 4:45 AM CDT
In force: 60 min
Issued by: the Storm Prediction Center

All 42 counties

Caldwell Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, Jackson Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Ouachita Parish, LA, Richland Parish, LA, Tensas Parish, LA, West Carroll Parish, LA, Alcorn County, MS, Attala County, MS, Benton County, MS, Calhoun County, MS, Carroll County, MS, Chickasaw County, MS, Choctaw County, MS, Clay County, MS, Grenada County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Itawamba County, MS, Leake County, MS, Lee County, MS, Madison County, MS, Montgomery County, MS, Pontotoc County, MS, Prentiss County, MS, Sharkey County, MS, Tippah County, MS, Tishomingo County, MS, Union County, MS, Warren County, MS, Webster County, MS, Yazoo County, MS, Chester County, TN, Hardeman County, TN, Hardin County, TN, Henderson County, TN, McNairy County, TN

The radar

The Jackson/Brandon,MS radar (KDGX), 144 km from the middle of the area, began a volume at 08:45 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.

Severe Thunderstorm Watch 62Apr 4, 5:25 AM CDT

The nearest sounding before it

Jackson, MS (KJAN), launched 00:00Z, 8.8 hours before the alert went out and 138 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 514 J/kg
Mixed-layer CIN: -205 J/kg
Mixed-layer LCL: 1384 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 89 m²/s²
0-3 km storm-relative helicity: 218 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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.

Issued	Product	Office	Counties	Lasted
Apr 3, 8:44 PM CDT	Mesoscale Discussion	SPC	Bienville, Bossier, Caddo, Caldwell, Claiborne, De Soto and 11 more	31 min
Apr 3, 8:54 PM CDT	Tornado Watch	SPC	Bienville, Bossier, Caddo, Claiborne, De Soto, Jackson and 5 more	7 hr
Apr 4, 12:20 AM CDT	Mesoscale Discussion	SPC	Caldwell, Catahoula, East Carroll, Franklin, LaSalle, Madison and 5 more	55 min
Apr 4, 12:40 AM CDT	Tornado Watch	SPC	Catahoula, Concordia, East Carroll, Franklin, Madison, Morehouse and 3 more	5 hr
Apr 4, 12:55 AM CDT	Mesoscale Discussion	SPC	Bienville, Bossier, Caddo, Claiborne, De Soto, Jackson and 4 more	95 min
Apr 4, 3:34 AM CDT	Severe Thunderstorm Watch	SPC	Allen, Beauregard, Calcasieu, Caldwell, Cameron, De Soto and 9 more	6 hr
Apr 4, 5:04 AM CDT	Mesoscale Discussion	SPC	Acadia, Ascension, Assumption, East Baton Rouge, East Feliciana, Iberia and 15 more	116 min
Apr 4, 5:25 AM CDT	Severe Thunderstorm Watch	SPC	Acadia, Ascension, Assumption, Avoyelles, Catahoula, Concordia and 30 more	7 hr
Apr 4, 5:28 AM CDT	Mesoscale Discussion	SPC	Catahoula, Concordia, Madison, Tensas	92 min
Apr 4, 5:49 AM CDT	Mesoscale Discussion	SPC	Allen, Beauregard, Calcasieu, Caldwell, De Soto, Franklin and 8 more	56 min
Apr 4, 7:22 AM CDT	Mesoscale Discussion	SPC	Acadia, Allen, Ascension, Assumption, Avoyelles, Calcasieu and 26 more	83 min
Apr 4, 10:12 AM CDT	Mesoscale Discussion	SPC	Acadia, Ascension, Assumption, Avoyelles, Cameron, Catahoula and 28 more	63 min
Apr 3, 10:45 PM CDT	Mesoscale Discussion	SPC	Benton, Bolivar, Calhoun, Carroll, Coahoma, DeSoto and 16 more	60 min
Apr 4, 2:29 AM CDT	Mesoscale Discussion	SPC	Alcorn, Clay, Itawamba, Lee, Lowndes, Monroe and 3 more	31 min
Apr 4, 2:52 AM CDT	Tornado Watch	SPC	Clay, Kemper, Lauderdale, Lowndes, Neshoba, Newton and 4 more	5 hr
Apr 3, 8:16 PM CDT	Mesoscale Discussion	SPC	Crockett, Dyer, Gibson, Henry, Lake, Lauderdale and 3 more	59 min
Apr 3, 8:30 PM CDT	Tornado Watch	SPC	Crockett, Dyer, Gibson, Henry, Lake, Lauderdale and 2 more	7 hr
Apr 3, 11:40 PM CDT	Mesoscale Discussion	SPC	Crockett, Dyer, Gibson, Henry, Lake, Lauderdale and 2 more	95 min
Apr 4, 1:39 AM CDT	Mesoscale Discussion	SPC	Cheatham, Davidson, Dickson, Houston, Humphreys, Macon and 6 more	3 hr
Apr 4, 2:12 AM CDT	Mesoscale Discussion	SPC	Dyer, Gibson, Henry, Obion, Stewart, Weakley	63 min
Apr 4, 4:42 AM CDT	Mesoscale Discussion	SPC	Campbell, Clay, Fentress, Jackson, Macon, Morgan and 7 more	93 min
Apr 4, 4:58 AM CDT	Severe Thunderstorm Watch	SPC	Anderson, Bledsoe, Campbell, Claiborne, Hamilton, Hancock and 8 more	5 hr
Apr 4, 7:00 AM CDT	Mesoscale Discussion	SPC	Blount, Cocke, Greene, Jefferson, Monroe, Polk and 1 more	90 min
Apr 4, 7:41 AM CDT	Mesoscale Discussion	SPC	Anderson, Campbell, Claiborne, Meigs, Morgan, Rhea and 3 more	49 min

Nearby

Mesoscale Discussions in Mississippi, 2014 Mesoscale Discussions in Louisiana, 2014 Mesoscale Discussions in Tennessee, 2014 Every 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.