Alert archive / Texas / Mesoscale Discussions in 2018

Mesoscale Discussion 347

May 4, 20184 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 4, 2018, 4:13 AM CDT for 4 counties in Texas. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued
May 4, 2018, 4:13 AM CDT (09:13 UTC)
Expired
May 4, 2018, 5:45 AM CDT
In force
92 min
Issued by
the Storm Prediction Center

Counties Edwards County, TX, Kinney County, TX, Sutton County, TX, Val Verde County, TX

The radar

The Laughlin AFB radar (KDFX), 54 km from the middle of the area, began a volume at 09:18 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

Del Rio, TX (KDLF), launched 00:00Z, 9.2 hours before the alert went out and 30 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 2018-05-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 376 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 2018-05-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 43 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
376 J/kg
Mixed-layer CIN
-39 J/kg
Mixed-layer LCL
2594 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
43 m²/s²
0-3 km storm-relative helicity
2 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.6

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 3, 9:05 PM CDTMesoscale DiscussionSPCAtascosa, Bandera, Bexar, Blanco, Burnet, Caldwell and 24 more85 min
May 3, 9:33 PM CDTSevere Thunderstorm WatchSPCAtascosa, Bandera, Bexar, Blanco, Burnet, Comal and 21 more9 hr
May 3, 11:53 PM CDTMesoscale DiscussionSPCAtascosa, Bandera, Bexar, Blanco, Burnet, Comal and 21 more2 hr
May 4, 7:52 AM CDTMesoscale DiscussionSPCAtascosa, Bandera, Bee, Bexar, Blanco, Caldwell and 21 more113 min
May 4, 4:41 PM CDTMesoscale DiscussionSPCBrooks, Cameron, Duval, Hidalgo, Jim Hogg, Jim Wells and 8 more94 min

Nearby

Mesoscale Discussions in Texas, 2018Every mesoscale discussion in 2018

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.