Alert archive / Texas / Mesoscale Discussions in 2019

Mesoscale Discussion 430

April 23, 2019Irion County, Reagan County, Tom Green County, Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 23, 2019, 11:50 PM CDT for Irion County, Reagan County, Tom Green County, Texas. It was in force for 85 min.

The area

The outline as issued.

The facts

Issued
Apr 23, 2019, 11:50 PM CDT (04:50 UTC)
Expired
Apr 24, 2019, 1:15 AM CDT
In force
85 min
Issued by
the Storm Prediction Center

Counties Irion County, TX, Reagan County, TX, Tom Green County, TX

The radar

The San Angelo radar (KSJT), 79 km from the middle of the area, began a volume at 04:50 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, 4.8 hours before the alert went out and 111 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 2019-04-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 570 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 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 2019-04-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 13 square meters per square second.19395878Sfc1 km3 km6 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
570 J/kg
Mixed-layer CIN
-44 J/kg
Mixed-layer LCL
1113 m above ground
0-6 km bulk shear
60 kt
0-1 km storm-relative helicity
13 m²/s²
0-3 km storm-relative helicity
106 m²/s²
Significant tornado parameter
0.2
Supercell composite
1.5

Open this sounding in Storm Lab

The text

As transmitted.

273 
ACUS11 KWNS 240450
SWOMCD
SPC MCD 240450 
TXZ000-240615-

Mesoscale Discussion 0430
NWS Storm Prediction Center Norman OK
1150 PM CDT Tue Apr 23 2019

Areas affected...Parts of the Edwards Plateau

Concerning...Severe Thunderstorm Watch 97...

Valid 240450Z - 240615Z

The severe weather threat for Severe Thunderstorm Watch 97
continues.

SUMMARY...Severe hail may continue another couple of hours, along
with potential for increasing damaging winds, in association with a
supercell approaching the San Angelo vicinity through 2-3 AM CDT.

DISCUSSION...Conglomerate outflow associated with increasingly
extensive convective development has gradually advanced southward
into the Edwards Plateau region during the past few hours.  This is
providing a continuing focus for strong low-level convergence,
enhanced by modest to weak southeasterly low-level flow beneath a
possible 50 kt west-southwesterly mid-level speed maximum
propagating into/through the region.

This configuration is contributing to moderately strong easterly
storm-relative inflow of moist and moderately unstable air (CAPE of
1000-1500 J/kg) into a sustained supercell emerging from southwest
Texas.  MRMS-MESH data indicates that this storm is probably still
producing severe hail.  As it progresses eastward there appears
potential for interaction with the outflow boundary that may lead to
a transition increasingly supportive of a corridor of strong wind
gusts, and eastward acceleration into the San Angelo vicinity
through 07-08Z.

..Kerr.. 04/24/2019

...Please see www.spc.noaa.gov for graphic product...

ATTN...WFO...SJT...MAF...

LAT...LON   31550187 31720124 31650030 31040035 30900105 30850184
            31080207 31550187

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 23, 7:58 PM CDTMesoscale DiscussionSPCBrewster, Culberson, Jeff Davis, Loving, Presidio, Reeves and 2 more47 min
Apr 23, 8:35 PM CDTMesoscale DiscussionSPCBrown, Callahan, Coke, Coleman, Comanche, Crane and 23 more55 min
Apr 23, 10:06 PM CDTMesoscale DiscussionSPCBandera, Blanco, Bosque, Brewster, Brown, Burnet and 49 more54 min
Apr 23, 10:42 PM CDTSevere Thunderstorm WatchSPCBosque, Brewster, Brown, Coleman, Collin, Comanche and 32 more6 hr
Apr 24, 2:16 AM CDTMesoscale DiscussionSPCBosque, Brewster, Brown, Callahan, Coke, Coleman and 27 more89 min
Apr 24, 10:11 AM CDTMesoscale DiscussionSPCAtascosa, Austin, Bandera, Bastrop, Bee, Bell and 60 more2 hr
Apr 24, 11:51 AM CDTSevere Thunderstorm WatchSPCAtascosa, Bandera, Bastrop, Bexar, Blanco, Burnet and 25 more7 hr
Apr 24, 2:31 PM CDTMesoscale DiscussionSPCAtascosa, Austin, Bandera, Bastrop, Bee, Bell and 39 more89 min
Apr 24, 3:47 PM CDTMesoscale DiscussionSPCAnderson, Angelina, Bastrop, Brazos, Burleson, Cherokee and 19 more43 min
Apr 24, 4:49 PM CDTSevere Thunderstorm WatchSPCAustin, Brazos, Burleson, Colorado, Grimes, Houston and 10 more5 hr
Apr 24, 5:23 PM CDTMesoscale DiscussionSPCAransas, Bee, Calhoun, Duval, Goliad, Jackson and 9 more67 min

Nearby

Mesoscale Discussions in Texas, 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.