Alert archive / Texas / Mesoscale Discussions in 2020

Mesoscale Discussion 345

April 12, 202050 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 12, 2020, 1:37 AM CDT for 50 counties in Texas. It was in force for 113 min.

The area

The outline as issued.

The facts

Issued
Apr 12, 2020, 1:37 AM CDT (06:37 UTC)
Expired
Apr 12, 2020, 3:30 AM CDT
In force
113 min
Issued by
the Storm Prediction Center
Chance of a watch
95%
All 50 counties

Bandera County, TX, Bell County, TX, Blanco County, TX, Bosque County, TX, Brazos County, TX, Brown County, TX, Burleson County, TX, Burnet County, TX, Callahan County, TX, Coleman County, TX, Comanche County, TX, Concho County, TX, Coryell County, TX, Crockett County, TX, Eastland County, TX, Edwards County, TX, Erath County, TX, Falls County, TX, Gillespie County, TX, Hamilton County, TX, Hays County, TX, Hill County, TX, Hood County, TX, Irion County, TX, Johnson County, TX, Kendall County, TX, Kerr County, TX, Kimble County, TX, Kinney County, TX, Lampasas County, TX, Llano County, TX, Mason County, TX, McCulloch County, TX, McLennan County, TX, Menard County, TX, Milam County, TX, Mills County, TX, Real County, TX, Robertson County, TX, Runnels County, TX, San Saba County, TX, Schleicher County, TX, Somervell County, TX, Sutton County, TX, Taylor County, TX, Tom Green County, TX, Travis County, TX, Uvalde County, TX, Val Verde County, TX, Williamson County, TX

The radar

The San Angelo radar (KSJT), 105 km from the middle of the area, began a volume at 06:36 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

Del Rio, TX (KDRT), launched 00:00Z, 6.6 hours before the alert went out and 159 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, Del Rio, TX at 00:00Z on 2020-04-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3028 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, Del Rio, TX at 00:00Z on 2020-04-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 185 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
3028 J/kg
Mixed-layer CIN
-37 J/kg
Mixed-layer LCL
1174 m above ground
0-6 km bulk shear
80 kt
0-1 km storm-relative helicity
185 m²/s²
0-3 km storm-relative helicity
286 m²/s²
Significant tornado parameter
4.8
Supercell composite
23.5

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
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, 9:23 PM CDTMesoscale DiscussionSPCArcher, Baylor, Callahan, Clay, Coke, Coleman and 23 more67 min
Apr 11, 11:03 PM CDTMesoscale DiscussionSPCAtascosa, Bandera, Bexar, Caldwell, Comal, DeWitt and 12 more57 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
Apr 12, 1:10 PM CDTMesoscale DiscussionSPCCamp, Collin, Cooke, Dallas, Delta, Denton and 17 more95 min
Apr 12, 2:51 PM CDTSevere Thunderstorm WatchSPCBowie, Camp, Cass, Delta, Fannin, Franklin and 11 more5 hr
Apr 12, 6:14 PM CDTMesoscale DiscussionSPCBowie, Camp, Cass, Franklin, Gregg, Harrison and 8 more91 min

Nearby

Mesoscale Discussions in Texas, 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.