Alert archive / Texas / Mesoscale Discussions in 2016

Mesoscale Discussion 225

March 17, 20165 states

The Storm Prediction Center issued this mesoscale discussion at Mar 17, 2016, 9:37 AM CDT for 5 states. It was in force for 83 min.

The area

The outline as issued.

The facts

Issued
Mar 17, 2016, 9:37 AM CDT (14:37 UTC)
Expired
Mar 17, 2016, 11:00 AM CDT
In force
83 min
Issued by
the Storm Prediction Center
Chance of a watch
40%
All 72 counties

Ashley County, AR, Calhoun County, AR, Columbia County, AR, Hempstead County, AR, Howard County, AR, Lafayette County, AR, Little River County, AR, Miller County, AR, Nevada County, AR, Ouachita County, AR, Sevier County, AR, Union County, AR, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Caldwell Parish, LA, Catahoula Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, Jackson Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Ouachita Parish, LA, Red River Parish, LA, Richland Parish, LA, Tensas Parish, LA, Union Parish, LA, Webster Parish, LA, West Carroll Parish, LA, Winn Parish, LA, Issaquena County, MS, Warren County, MS, Bryan County, OK, Choctaw County, OK, McCurtain County, OK, Bowie County, TX, Camp County, TX, Cass County, TX, Collin County, TX, Cooke County, TX, Dallas County, TX, Delta County, TX, Denton County, TX, Ellis County, TX, Fannin County, TX, Franklin County, TX, Grayson County, TX, Gregg County, TX, Harrison County, TX, Henderson County, TX, Hopkins County, TX, Hunt County, TX, Kaufman County, TX, Lamar County, TX, Marion County, TX, Morris County, TX, Panola County, TX, Rains County, TX, Red River County, TX, Rockwall County, TX, Rusk County, TX, Smith County, TX, Tarrant County, TX, Titus County, TX, Upshur County, TX, Van Zandt County, TX, Wise County, TX, Wood County, TX

The radar

The Shreveport radar (KSHV), 114 km from the middle of the area, began a volume at 14:38 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

Shreveport, LA (KBAD), launched 12:00Z, 2.6 hours before the alert went out and 119 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, Shreveport, LA 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, Shreveport, LA at 12:00Z on 2016-03-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 109 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
1777 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
109 m²/s²
0-3 km storm-relative helicity
231 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.7

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, 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, 3:48 PM CDTMesoscale DiscussionSPCAvoyelles, Catahoula, Concordia, East Feliciana, Franklin, Grant and 12 more87 min
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 Texas, 2016Mesoscale Discussions in Louisiana, 2016Mesoscale Discussions in Arkansas, 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.