Alert archive / Texas / Mesoscale Discussions in 2015

Mesoscale Discussion 811

May 27, 201524 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 27, 2015, 3:09 PM CDT for 24 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
May 27, 2015, 3:09 PM CDT (20:09 UTC)
Expired
May 27, 2015, 5:15 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
Chance of a watch
20%
All 24 counties

Archer County, TX, Baylor County, TX, Brown County, TX, Callahan County, TX, Clay County, TX, Coleman County, TX, Comanche County, TX, Concho County, TX, Eastland County, TX, Erath County, TX, Hamilton County, TX, Jack County, TX, Lampasas County, TX, Llano County, TX, Mason County, TX, McCulloch County, TX, Menard County, TX, Mills County, TX, Palo Pinto County, TX, San Saba County, TX, Shackelford County, TX, Stephens County, TX, Throckmorton County, TX, Young County, TX

The radar

The Dyess AFB radar (KDYX), 30 km from the middle of the area, began a volume at 20:10 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

Fort Worth, TX (KFWD), launched 12:00Z, 8.2 hours before the alert went out and 162 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, Fort Worth, TX at 12:00Z on 2015-05-27Temperature 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, Fort Worth, TX at 12:00Z on 2015-05-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 141 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1744 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
141 m²/s²
0-3 km storm-relative helicity
195 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 26, 8:25 PM CDTMesoscale DiscussionSPCCoke, Coleman, Concho, Irion, Kimble, McCulloch and 6 more95 min
May 26, 8:51 PM CDTMesoscale DiscussionSPCCallahan, Comanche, Eastland, Erath, Hood, Jack and 8 more84 min
May 26, 9:27 PM CDTSevere Thunderstorm WatchSPCBosque, Brown, Callahan, Coleman, Collin, Comanche and 37 more6 hr
May 26, 11:47 PM CDTMesoscale DiscussionSPCAnderson, Bell, Bosque, Comanche, Coryell, Erath and 16 more88 min
May 27, 4:48 AM CDTMesoscale DiscussionSPCAustin, Chambers, Fort Bend, Hardin, Harris, Jasper and 13 more117 min
May 27, 11:39 AM CDTMesoscale DiscussionSPCAtascosa, Bandera, Bexar, Blanco, Caldwell, Comal and 16 more66 min
May 27, 2:13 PM CDTMesoscale DiscussionSPCChildress, Collingsworth, Donley, Gray, Hemphill, Lipscomb and 3 more92 min
May 27, 2:46 PM CDTTornado WatchSPCArmstrong, Carson, Collingsworth, Donley, Gray, Hansford and 7 more10 hr
May 27, 5:05 PM CDTMesoscale DiscussionSPCAndrews, Bailey, Borden, Briscoe, Castro, Cochran and 23 more115 min
May 27, 6:16 PM CDTMesoscale DiscussionSPCCollingsworth, Donley, Gray, Hansford, Hemphill, Lipscomb and 3 more119 min

Nearby

Mesoscale Discussions in Texas, 2015Every mesoscale discussion in 2015

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.