Alert archive / Texas / Mesoscale Discussions in 2014

Mesoscale Discussion 543

May 9, 20144 counties in Arkansas; Bossier Parish, Caddo Parish, Webster Parish, Louisiana; 24 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 9, 2014, 6:14 PM CDT for 4 counties in Arkansas; Bossier Parish, Caddo Parish, Webster Parish, Louisiana; 24 counties in Texas. It was in force for 61 min.

The area

The outline as issued.

The facts

Issued
May 9, 2014, 6:14 PM CDT (23:14 UTC)
Expired
May 9, 2014, 7:15 PM CDT
In force
61 min
Issued by
the Storm Prediction Center
Chance of a watch
40%
All 31 counties

Columbia County, AR, Hempstead County, AR, Lafayette County, AR, Miller County, AR, Bossier Parish, LA, Caddo Parish, LA, Webster Parish, LA, Anderson County, TX, Bowie County, TX, Camp County, TX, Cass County, TX, Cherokee County, TX, Ellis County, TX, Franklin County, TX, Freestone County, TX, Gregg County, TX, Harrison County, TX, Henderson County, TX, Kaufman County, TX, Limestone County, TX, Marion County, TX, Morris County, TX, Navarro County, TX, Panola County, TX, Rains County, TX, Rusk County, TX, Smith County, TX, Titus County, TX, Upshur County, TX, Van Zandt County, TX, Wood County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 157 km from the middle of the area, began a volume at 23:13 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

Shreveport, LA (KBAD), launched 12:00Z, 11.2 hours before the alert went out and 184 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 2014-05-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 601 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 2014-05-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 316 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
601 J/kg
Mixed-layer CIN
-82 J/kg
Mixed-layer LCL
511 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
316 m²/s²
0-3 km storm-relative helicity
378 m²/s²
Significant tornado parameter
0.0
Supercell composite
7.1

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.

IssuedProductOfficeCountiesLasted
May 9, 2:35 PM CDTMesoscale DiscussionSPCClay115 min
May 9, 3:18 PM CDTMesoscale DiscussionSPCColumbia, Hempstead, Howard, Lafayette, Little River, Miller and 3 more117 min
May 9, 6:25 PM CDTMesoscale DiscussionSPCClay, Craighead, Greene65 min
May 8, 8:20 PM CDTMesoscale DiscussionSPCBell, Blanco, Burnet, Comal, Falls, Gillespie and 8 more55 min
May 8, 9:41 PM CDTMesoscale DiscussionSPCBell, Blanco, Burnet, Falls, Gillespie, Hays and 5 more64 min
May 9, 9:46 AM CDTMesoscale DiscussionSPCBandera, Kerr, Kinney, Maverick, Medina, Real and 2 more2 hr
May 9, 10:39 AM CDTSevere Thunderstorm WatchSPCAtascosa, Bandera, Bastrop, Bexar, Blanco, Burnet and 26 more6 hr
May 9, 2:00 PM CDTMesoscale DiscussionSPCAnderson, Atascosa, Austin, Bandera, Bastrop, Bell and 45 more90 min
May 9, 4:34 PM CDTMesoscale DiscussionSPCBee, Brooks, Duval, Jim Hogg, Jim Wells, Kleberg and 6 more116 min
May 9, 4:55 PM CDTSevere Thunderstorm WatchSPCBrooks, Cameron, Duval, Hidalgo, Jim Hogg, Jim Wells and 7 more6 hr

Nearby

Mesoscale Discussions in Texas, 2014Mesoscale Discussions in Arkansas, 2014Mesoscale Discussions in Louisiana, 2014Every 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.