Alert archive / Texas / Mesoscale Discussions in 2016

Mesoscale Discussion 291

March 30, 201611 counties in Arkansas; 8 parishes in Louisiana; 13 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Mar 30, 2016, 5:06 PM CDT for 11 counties in Arkansas; 8 parishes in Louisiana; 13 counties in Texas. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued
Mar 30, 2016, 5:06 PM CDT (22:06 UTC)
Expired
Mar 30, 2016, 6:30 PM CDT
In force
84 min
Issued by
the Storm Prediction Center
All 32 counties

Calhoun County, AR, Clark County, AR, Columbia County, AR, Dallas County, AR, Hempstead County, AR, Lafayette County, AR, Little River County, AR, Miller County, AR, Nevada County, AR, Ouachita County, AR, Union County, AR, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Lincoln Parish, LA, Red River Parish, LA, Webster Parish, LA, Bowie County, TX, Camp County, TX, Cass County, TX, Gregg County, TX, Harrison County, TX, Marion County, TX, Morris County, TX, Panola County, TX, Rusk County, TX, Smith County, TX, Titus County, TX, Upshur County, TX, Wood County, TX

The radar

The Shreveport radar (KSHV), 62 km from the middle of the area, began a volume at 22:05 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, 10.1 hours before the alert went out and 60 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 2016-03-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 568 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, Shreveport, LA at 12:00Z on 2016-03-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 35 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
568 J/kg
Mixed-layer CIN
-248 J/kg
Mixed-layer LCL
547 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
35 m²/s²
0-3 km storm-relative helicity
123 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.2

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 30, 11:57 AM CDTMesoscale DiscussionSPCBaxter, Benton, Boone, Carroll, Clark, Conway and 27 more63 min
Mar 30, 2:07 PM CDTMesoscale DiscussionSPCColumbia, Hempstead, Lafayette, Little River, Miller, Nevada and 1 more83 min
Mar 30, 2:31 PM CDTTornado WatchSPCArkansas, Bradley, Calhoun, Clark, Cleveland, Columbia and 23 more7 hr
Mar 30, 6:15 PM CDTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 17 more90 min
Mar 30, 6:53 PM CDTTornado WatchSPCAshley, Chicot, Craighead, Crittenden, Cross, Lee and 4 more8 hr
Mar 30, 3:53 PM CDTMesoscale DiscussionSPCAllen, Avoyelles, Evangeline, Grant, LaSalle, Pointe Coupee and 3 more97 min
Mar 30, 1:00 PM CDTMesoscale DiscussionSPCArcher, Baylor, Clay, Montague, Wichita, Wilbarger2 hr
Mar 30, 1:50 PM CDTSevere Thunderstorm WatchSPCArcher, Baylor, Clay, Wichita8 hr
Mar 30, 1:57 PM CDTMesoscale DiscussionSPCBosque, Brown, Callahan, Coke, Coleman, Collin and 28 more63 min
Mar 30, 2:09 PM CDTSevere Thunderstorm WatchSPCBosque, Brown, Callahan, Coke, Coleman, Collin and 28 more5 hr
Mar 30, 3:54 PM CDTMesoscale DiscussionSPCArcher, Bosque, Brown, Callahan, Clay, Coleman and 27 more96 min
Mar 30, 5:36 PM CDTSevere Thunderstorm WatchSPCAnderson, Bell, Bosque, Collin, Coryell, Dallas and 30 more4 hr

Nearby

Mesoscale Discussions in Texas, 2016Mesoscale Discussions in Arkansas, 2016Mesoscale Discussions in Louisiana, 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.