Alert archive / Texas / Mesoscale Discussions in 2020

Mesoscale Discussion 342

April 11, 20204 counties in Oklahoma; 29 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 11, 2020, 9:23 PM CDT for 4 counties in Oklahoma; 29 counties in Texas. It was in force for 67 min.

The area

The outline as issued.

The facts

Issued
Apr 11, 2020, 9:23 PM CDT (02:23 UTC)
Expired
Apr 11, 2020, 10:30 PM CDT
In force
67 min
Issued by
the Storm Prediction Center
All 33 counties

Comanche County, OK, Cotton County, OK, Jackson County, OK, Tillman County, OK, Archer County, TX, Baylor County, TX, Callahan County, TX, Clay County, TX, Coke County, TX, Coleman County, TX, Concho County, TX, Crockett County, TX, Eastland County, TX, Fisher County, TX, Foard County, TX, Hardeman County, TX, Haskell County, TX, Irion County, TX, Jack County, TX, Jones County, TX, Knox County, TX, Nolan County, TX, Runnels County, TX, Schleicher County, TX, Shackelford County, TX, Stephens County, TX, Sterling County, TX, Taylor County, TX, Throckmorton County, TX, Tom Green County, TX, Wichita County, TX, Wilbarger County, TX, Young County, TX

The radar

The Dyess AFB radar (KDYX), 66 km from the middle of the area, began a volume at 02:25 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

Midland Regional, TX (KMAF), launched 00:00Z, 2.4 hours before the alert went out and 223 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, Midland Regional, TX at 00:00Z on 2020-04-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4 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, Midland Regional, TX at 00:00Z on 2020-04-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -21 square meters per square second.1939587897117Sfc1 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
4 J/kg
Mixed-layer CIN
-30 J/kg
Mixed-layer LCL
3489 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
-21 m²/s²
0-3 km storm-relative helicity
15 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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
Apr 11, 8:57 PM CDTMesoscale DiscussionSPCAtoka, Bryan, Carter, Cleveland, Coal, Garvin and 11 more63 min
Apr 11, 9:01 PM CDTSevere Thunderstorm WatchSPCAtoka, Bryan, Carter, Coal, Garvin, Jefferson and 6 more4 hr
Apr 11, 11:41 PM CDTMesoscale DiscussionSPCAtoka, Bryan, Carter, Coal, Garvin, Jefferson and 6 more94 min
Apr 12, 1:10 PM CDTMesoscale DiscussionSPCAdair, Atoka, Bryan, Carter, Cherokee, Choctaw and 34 more95 min
Apr 12, 2:51 PM CDTSevere Thunderstorm WatchSPCAtoka, Bryan, Carter, Choctaw, Coal, Garvin and 12 more5 hr
Apr 12, 4:44 PM CDTMesoscale DiscussionSPCAdair2 hr
Apr 12, 6:14 PM CDTMesoscale DiscussionSPCMcCurtain91 min
Apr 11, 7:51 PM CDTMesoscale DiscussionSPCEdwards, Kinney, Real, Sutton, Uvalde, Val Verde84 min
Apr 11, 8:37 PM CDTTornado WatchSPCAtascosa, Bandera, Bastrop, Bexar, Blanco, Caldwell and 23 more5 hr
Apr 11, 11:03 PM CDTMesoscale DiscussionSPCAtascosa, Bandera, Bexar, Caldwell, Comal, DeWitt and 12 more57 min
Apr 12, 1:37 AM CDTMesoscale DiscussionSPCBandera, Bell, Blanco, Bosque, Brazos, Brown and 44 more113 min
Apr 12, 1:59 AM CDTTornado WatchSPCBandera, Bastrop, Bell, Bexar, Blanco, Bosque and 37 more6 hr
Apr 12, 4:15 AM CDTMesoscale DiscussionSPCBandera, Bastrop, Bell, Blanco, Bosque, Brown and 24 more90 min
Apr 12, 5:52 AM CDTTornado WatchSPCAnderson, Angelina, Brazos, Burleson, Cherokee, Freestone and 19 more8 hr
Apr 12, 7:18 AM CDTMesoscale DiscussionSPCAnderson, Camp, Cass, Cherokee, Falls, Freestone and 20 more87 min
Apr 12, 9:30 AM CDTMesoscale DiscussionSPCSan Augustine, Shelby90 min

Nearby

Mesoscale Discussions in Texas, 2020Mesoscale Discussions in Oklahoma, 2020Every mesoscale discussion in 2020

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.