Alert archive / Texas / Mesoscale Discussions in 2015

Mesoscale Discussion 698

May 19, 201540 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 19, 2015, 2:30 PM CDT for 40 counties in Texas. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued
May 19, 2015, 2:30 PM CDT (19:30 UTC)
Expired
May 19, 2015, 3:30 PM CDT
In force
60 min
Issued by
the Storm Prediction Center
Chance of a watch
20%
All 40 counties

Bell County, TX, Bosque County, TX, Brown County, TX, Callahan County, TX, Coleman County, TX, Collin County, TX, Comanche County, TX, Coryell County, TX, Dallas County, TX, Denton County, TX, Eastland County, TX, Ellis County, TX, Erath County, TX, Falls County, TX, Freestone County, TX, Hamilton County, TX, Henderson County, TX, Hill County, TX, Hood County, TX, Hunt County, TX, Johnson County, TX, Kaufman County, TX, Lampasas County, TX, Limestone County, TX, McCulloch County, TX, McLennan County, TX, Mills County, TX, Navarro County, TX, Palo Pinto County, TX, Parker County, TX, Rains County, TX, Rockwall County, TX, San Saba County, TX, Shackelford County, TX, Smith County, TX, Somervell County, TX, Stephens County, TX, Tarrant County, TX, Van Zandt County, TX, Wise County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 56 km from the middle of the area, began a volume at 19:33 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

Fort Worth, TX (KFWD), launched 12:00Z, 7.5 hours before the alert went out and 83 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 2015-05-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1766 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, Fort Worth, TX at 12:00Z on 2015-05-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 42 square meters per square second.1939Sfc1 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
1766 J/kg
Mixed-layer CIN
-13 J/kg
Mixed-layer LCL
551 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
42 m²/s²
0-3 km storm-relative helicity
87 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 18, 8:00 PM CDTMesoscale DiscussionSPCBell, Blanco, Burnet, Concho, Coryell, Crockett and 12 more2 hr
May 18, 9:01 PM CDTMesoscale DiscussionSPCAndrews, Cochran, Crane, Crockett, Ector, Gaines and 12 more89 min
May 19, 12:53 AM CDTMesoscale DiscussionSPCBailey, Cochran, Parmer97 min
May 19, 2:15 AM CDTMesoscale DiscussionSPCCrockett, Irion, Reagan, Schleicher, Sutton, Tom Green90 min
May 19, 5:13 AM CDTMesoscale DiscussionSPCArmstrong, Bailey, Briscoe, Carson, Castro, Cochran and 16 more92 min
May 19, 1:02 PM CDTMesoscale DiscussionSPCArcher, Baylor, Clay, Fisher, Foard, Hardeman and 12 more118 min
May 19, 1:32 PM CDTTornado WatchSPCArcher, Baylor, Clay, Cooke, Foard, Hardeman and 4 more7 hr
May 19, 3:33 PM CDTMesoscale DiscussionSPCArmstrong, Borden, Briscoe, Carson, Castro, Childress and 27 more117 min
May 19, 3:51 PM CDTMesoscale DiscussionSPCArcher, Baylor, Clay, Hardeman, Montague, Wichita and 1 more114 min
May 19, 5:31 PM CDTMesoscale DiscussionSPCArcher, Baylor, Clay, Cooke, Foard, Hardeman and 6 more89 min
May 19, 5:56 PM CDTTornado WatchSPCComanche, Cooke, Denton, Eastland, Erath, Hood and 7 more6 hr

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.