Alert archive / Texas / Mesoscale Discussions in 2016

Mesoscale Discussion 763

May 27, 20169 parishes in Louisiana; 34 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 27, 2016, 12:57 PM CDT for 9 parishes in Louisiana; 34 counties in Texas. It was in force for 63 min.

The area

The outline as issued.

The facts

Issued
May 27, 2016, 12:57 PM CDT (17:57 UTC)
Expired
May 27, 2016, 2:00 PM CDT
In force
63 min
Issued by
the Storm Prediction Center
Chance of a watch
40%
All 43 counties

Allen Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, De Soto Parish, LA, Grant Parish, LA, Natchitoches Parish, LA, Red River Parish, LA, Sabine Parish, LA, Vernon Parish, LA, Angelina County, TX, Austin County, TX, Bastrop County, TX, Brazoria County, TX, Caldwell County, TX, Chambers County, TX, Colorado County, TX, DeWitt County, TX, Fayette County, TX, Fort Bend County, TX, Gonzales County, TX, Grimes County, TX, Hardin County, TX, Harris County, TX, Jackson County, TX, Jasper County, TX, Jefferson County, TX, Lavaca County, TX, Liberty County, TX, Montgomery County, TX, Nacogdoches County, TX, Newton County, TX, Orange County, TX, Polk County, TX, Sabine County, TX, San Augustine County, TX, San Jacinto County, TX, Shelby County, TX, Trinity County, TX, Tyler County, TX, Walker County, TX, Waller County, TX, Washington County, TX, Wharton County, TX

The radar

The Houston radar (KHGX), 101 km from the middle of the area, began a volume at 17:57 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

Lake Charles Mun, LA (KLCH), launched 12:00Z, 6.0 hours before the alert went out and 217 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, Lake Charles Mun, LA at 12:00Z on 2016-05-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2178 joules per kilogram.LCLEL10008507005003002001001 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, Lake Charles Mun, LA at 12:00Z on 2016-05-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 151 square meters per square second.193958Sfc1 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
2178 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
565 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
151 m²/s²
0-3 km storm-relative helicity
243 m²/s²
Significant tornado parameter
1.1
Supercell composite
6.7

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
May 27, 2:04 PM CDTSevere Thunderstorm WatchSPCAcadia, Allen, Avoyelles, Beauregard, Calcasieu, Caldwell and 12 more6 hr
May 27, 4:03 PM CDTMesoscale DiscussionSPCAcadia, Allen, Avoyelles, Beauregard, Calcasieu, Caldwell and 25 more117 min
May 26, 7:33 PM CDTSevere Thunderstorm WatchSPCBosque, Comanche, Dallas, Eastland, Ellis, Erath and 12 more5 hr
May 26, 7:46 PM CDTMesoscale DiscussionSPCFoard, Hardeman, Wichita, Wilbarger59 min
May 26, 9:14 PM CDTMesoscale DiscussionSPCArcher, Bandera, Baylor, Brown, Burnet, Callahan and 47 more61 min
May 26, 10:04 PM CDTMesoscale DiscussionSPCBastrop, Bexar, Blanco, Caldwell, Comal, Fayette and 6 more56 min
May 26, 10:17 PM CDTSevere Thunderstorm WatchSPCBandera, Bastrop, Blanco, Burnet, Caldwell, Comal and 9 more6 hr
May 26, 11:06 PM CDTMesoscale DiscussionSPCCoryell, Dallas, Ellis, Hill, McLennan84 min
May 27, 1:30 AM CDTMesoscale DiscussionSPCBrown, Callahan, Coleman, Comanche, Concho, Eastland and 9 more60 min
May 27, 2:14 AM CDTMesoscale DiscussionSPCAustin, Chambers, Colorado, Fayette, Fort Bend, Harris and 4 more61 min
May 27, 2:38 AM CDTSevere Thunderstorm WatchSPCAustin, Brazoria, Chambers, Colorado, Fort Bend, Galveston and 16 more5 hr
May 27, 5:50 AM CDTMesoscale DiscussionSPCChambers, Hardin, Jasper, Jefferson, Newton, Orange and 1 more25 min

Nearby

Mesoscale Discussions in Texas, 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.