Alert archive / Texas / Mesoscale Discussions in 2019

Mesoscale Discussion 669

May 18, 20195 counties in Arkansas; 5 counties in Oklahoma; 48 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 18, 2019, 12:11 PM CDT for 5 counties in Arkansas; 5 counties in Oklahoma; 48 counties in Texas. It was in force for 64 min.

The area

The outline as issued.

The facts

Issued
May 18, 2019, 12:11 PM CDT (17:11 UTC)
Expired
May 18, 2019, 1:15 PM CDT
In force
64 min
Issued by
the Storm Prediction Center
All 58 counties

Howard County, AR, Little River County, AR, Polk County, AR, Scott County, AR, Sevier County, AR, Choctaw County, OK, Latimer County, OK, LeFlore County, OK, McCurtain County, OK, Pushmataha County, OK, Anderson County, TX, Bell County, TX, Blanco County, TX, Bosque County, TX, Bowie County, TX, Burnet County, TX, Camp County, TX, Cass County, TX, Cherokee County, TX, Coryell County, TX, Dallas County, TX, Delta County, TX, Ellis County, TX, Falls County, TX, Franklin County, TX, Freestone County, TX, Gillespie County, TX, Gregg County, TX, Hamilton County, TX, Henderson County, TX, Hill County, TX, Hopkins County, TX, Houston County, TX, Hunt County, TX, Johnson County, TX, Kaufman County, TX, Lamar County, TX, Lampasas County, TX, Leon County, TX, Limestone County, TX, Llano County, TX, Mason County, TX, McLennan County, TX, Milam County, TX, Mills County, TX, Morris County, TX, Navarro County, TX, Rains County, TX, Red River County, TX, Robertson County, TX, Rockwall County, TX, San Saba County, TX, Smith County, TX, Titus County, TX, Upshur County, TX, Van Zandt County, TX, Williamson County, TX, Wood County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 51 km from the middle of the area, began a volume at 17:10 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 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, 5.2 hours before the alert went out and 59 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 2019-05-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2163 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 2019-05-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 302 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
2163 J/kg
Mixed-layer CIN
-64 J/kg
Mixed-layer LCL
722 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
302 m²/s²
0-3 km storm-relative helicity
311 m²/s²
Significant tornado parameter
3.0
Supercell composite
16.5

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 18, 9:10 AM CDTTornado WatchSPCBenton, Carroll, Crawford, Franklin, Madison, Sebastian and 1 more8 hr
May 18, 12:47 PM CDTMesoscale DiscussionSPCBaxter, Benton, Boone, Carroll, Crawford, Franklin and 9 more88 min
May 18, 12:48 PM CDTTornado WatchSPCArkansas, Baxter, Boone, Bradley, Calhoun, Clark and 42 more7 hr
May 18, 3:32 PM CDTMesoscale DiscussionSPCBaxter, Boone, Clark, Cleburne, Conway, Dallas and 24 more88 min
May 18, 6:19 PM CDTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Chicot, Cleveland, Craighead and 21 more116 min
May 18, 6:42 PM CDTSevere Thunderstorm WatchSPCCrittenden, Cross, Lee, Phillips, St. Francis4 hr
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, 5:11 AM CDTMesoscale DiscussionSPCCarter, Comanche, Cotton, Garvin, Jefferson, Love and 3 more2 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, 9:38 AM CDTMesoscale DiscussionSPCCraig, Creek, Delaware, Mayes, Nowata, Osage and 5 more2 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 Arkansas, 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.