Alert archive / Texas / Mesoscale Discussions in 2019

Mesoscale Discussion 665

May 18, 20199 counties in Oklahoma; 40 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 18, 2019, 5:11 AM CDT for 9 counties in Oklahoma; 40 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
May 18, 2019, 5:11 AM CDT (10:11 UTC)
Expired
May 18, 2019, 7:15 AM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 49 counties

Carter County, OK, Comanche County, OK, Cotton County, OK, Garvin County, OK, Jefferson County, OK, Love County, OK, Murray County, OK, Stephens County, OK, Tillman County, OK, Archer County, TX, Baylor County, TX, Brown County, TX, Callahan County, TX, Clay County, TX, Coke County, TX, Coleman County, TX, Comanche County, TX, Concho County, TX, Eastland County, TX, Erath County, TX, Fisher County, TX, Foard County, TX, Glasscock County, TX, Haskell County, TX, Howard County, TX, Irion County, TX, Jack County, TX, Jones County, TX, Kent County, TX, King County, TX, Knox County, TX, Mitchell County, TX, Montague County, TX, Nolan County, TX, Palo Pinto County, TX, Reagan County, TX, Runnels County, TX, Scurry County, TX, Shackelford County, TX, Stephens County, TX, Sterling County, TX, Stonewall County, TX, Taylor County, TX, Throckmorton County, TX, Tom Green County, TX, Wichita County, TX, Wilbarger County, TX, Wise County, TX, Young County, TX

The radar

The Dyess AFB radar (KDYX), 48 km from the middle of the area, began a volume at 10:12 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 00:00Z, 10.2 hours before the alert went out and 233 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 00:00Z on 2019-05-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1123 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 00:00Z on 2019-05-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 86 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
1123 J/kg
Mixed-layer CIN
-131 J/kg
Mixed-layer LCL
1440 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
86 m²/s²
0-3 km storm-relative helicity
204 m²/s²
Significant tornado parameter
0.1
Supercell composite
3.6

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 17, 7:00 PM CDTMesoscale DiscussionSPCBeaver2 hr
May 18, 1:35 AM CDTMesoscale DiscussionSPCCarter, Comanche, Cotton, Garvin, Grady, Jefferson and 2 more2 hr
May 18, 2:20 AM CDTTornado WatchSPCCarter, Cleveland, Comanche, Cotton, Garvin, Grady and 9 more8 hr
May 18, 6:51 AM CDTMesoscale DiscussionSPCCarter, Cleveland, Coal, Cotton, Garvin, Grady and 11 more114 min
May 18, 7:47 AM CDTMesoscale DiscussionSPCAlfalfa, Blaine, Caddo, Canadian, Cleveland, Creek and 18 more88 min
May 18, 9:10 AM CDTTornado WatchSPCAdair, Atoka, Bryan, Cherokee, Choctaw, Coal and 27 more8 hr
May 18, 9:38 AM CDTMesoscale DiscussionSPCCraig, Creek, Delaware, Mayes, Nowata, Osage and 5 more2 hr
May 18, 12:11 PM CDTMesoscale DiscussionSPCChoctaw, Latimer, LeFlore, McCurtain, Pushmataha64 min
May 18, 12:47 PM CDTMesoscale DiscussionSPCAdair, Sequoyah88 min
May 18, 12:48 PM CDTTornado WatchSPCMcCurtain7 hr
May 18, 3:31 PM CDTMesoscale DiscussionSPCAlfalfa, Dewey, Ellis, Garfield, Grant, Harper and 3 more119 min
May 18, 3:48 PM CDTSevere Thunderstorm WatchSPCAlfalfa, Beaver, Blaine, Ellis, Garfield, Grant and 5 more6 hr
May 18, 6:07 PM CDTMesoscale DiscussionSPCAlfalfa, Beaver, Dewey, Ellis, Garfield, Grant and 6 more83 min
May 17, 9:20 PM CDTMesoscale DiscussionSPCCrockett, Irion, Reagan, Schleicher, Sutton, Terrell and 1 more85 min
May 17, 11:47 PM CDTMesoscale DiscussionSPCBorden, Brown, Callahan, Coke, Coleman, Concho and 34 more2 hr
May 18, 1:16 PM CDTTornado WatchSPCAnderson, Bastrop, Bell, Blanco, Brazos, Burleson and 19 more9 hr
May 18, 5:16 PM CDTMesoscale DiscussionSPCAngelina, Grimes, Houston, Jasper, Nacogdoches, Newton and 9 more119 min
May 18, 6:37 PM CDTMesoscale DiscussionSPCCooke, Dallas, Denton, Parker, Tarrant, Wise53 min

Nearby

Mesoscale Discussions in Texas, 2019Mesoscale Discussions in Oklahoma, 2019Every mesoscale discussion in 2019

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.