Alert archive / Texas / Mesoscale Discussions in 2015

Mesoscale Discussion 764

May 25, 201514 counties in Oklahoma; 32 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 25, 2015, 1:54 PM CDT for 14 counties in Oklahoma; 32 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
May 25, 2015, 1:54 PM CDT (18:54 UTC)
Expired
May 25, 2015, 4:00 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 46 counties

Carter County, OK, Cleveland County, OK, Cotton County, OK, Garvin County, OK, Grady County, OK, Jefferson County, OK, Johnston County, OK, Love County, OK, Marshall County, OK, McClain County, OK, Murray County, OK, Pontotoc County, OK, Pottawatomie County, OK, Stephens County, OK, Bell County, TX, Bosque County, TX, Clay County, TX, Collin County, TX, Cooke County, TX, Coryell County, TX, Dallas County, TX, Denton County, TX, Ellis County, TX, Erath County, TX, Falls County, TX, Grayson County, TX, Hamilton County, TX, Hill County, TX, Hood County, TX, Johnson County, TX, Kaufman County, TX, Lampasas County, TX, Limestone County, TX, Mason County, TX, McLennan County, TX, Milam County, TX, Mills County, TX, Montague County, TX, Navarro County, TX, Parker County, TX, Robertson County, TX, Rockwall County, TX, San Saba County, TX, Somervell County, TX, Tarrant 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 18:56 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, 6.9 hours before the alert went out and 48 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 2015-05-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1630 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 2015-05-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 164 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
1630 J/kg
Mixed-layer CIN
-73 J/kg
Mixed-layer LCL
663 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
164 m²/s²
0-3 km storm-relative helicity
75 m²/s²
Significant tornado parameter
0.7
Supercell composite
7.0

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 24, 7:57 PM CDTMesoscale DiscussionSPCBeaver, Ellis, Texas93 min
May 24, 8:24 PM CDTTornado WatchSPCBeaver, Ellis, Harper, Texas, Woodward5 hr
May 25, 10:13 AM CDTMesoscale DiscussionSPCAtoka, Bryan, Carter, Choctaw, Coal, Comanche and 10 more2 hr
May 25, 10:54 AM CDTTornado WatchSPCAtoka, Bryan, Caddo, Canadian, Carter, Cleveland and 21 more7 hr
May 25, 12:22 PM CDTMesoscale DiscussionSPCAlfalfa, Blaine, Caddo, Canadian, Cleveland, Creek and 26 more83 min
May 25, 2:35 PM CDTMesoscale DiscussionSPCAtoka, Bryan, Choctaw, Coal, Latimer, LeFlore and 2 more55 min
May 25, 2:52 PM CDTTornado WatchSPCAdair, Cherokee, Choctaw, Delaware, Haskell, Latimer and 7 more8 hr
May 25, 5:15 PM CDTMesoscale DiscussionSPCAdair, Haskell, LeFlore, McCurtain, Sequoyah90 min
May 25, 3:17 AM CDTMesoscale DiscussionSPCBandera, Coke, Crane, Crockett, Ector, Edwards and 21 more4 hr
May 25, 6:45 AM CDTSevere Thunderstorm WatchSPCAndrews, Borden, Brown, Callahan, Coke, Coleman and 34 more6 hr
May 25, 6:50 AM CDTMesoscale DiscussionSPCAndrews, Borden, Callahan, Coke, Coleman, Crosby and 26 more55 min
May 25, 7:53 AM CDTMesoscale DiscussionSPCBandera, Bexar, Blanco, Burnet, Comal, Frio and 8 more2 hr
May 25, 9:02 AM CDTTornado WatchSPCAtascosa, Bandera, Bastrop, Bexar, Blanco, Burnet and 27 more7 hr
May 25, 11:37 AM CDTMesoscale DiscussionSPCAtascosa, Bandera, Bastrop, Bexar, Blanco, Burnet and 26 more113 min
May 25, 2:10 PM CDTMesoscale DiscussionSPCAustin, Bastrop, Bexar, Blanco, Brazos, Burleson and 26 more95 min
May 25, 3:19 PM CDTMesoscale DiscussionSPCAtascosa, Bandera, Bexar, Dimmit, Edwards, Frio and 9 more56 min
May 25, 5:51 PM CDTTornado WatchSPCSabine6 hr
May 25, 6:06 PM CDTMesoscale DiscussionSPCAustin, Brazoria, Chambers, Colorado, Fort Bend, Galveston and 14 more54 min
May 25, 6:24 PM CDTTornado WatchSPCAustin, Bee, Brazoria, Calhoun, Chambers, Colorado and 18 more9 hr

Nearby

Mesoscale Discussions in Texas, 2015Mesoscale Discussions in Oklahoma, 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.