Alert archive / Texas / Mesoscale Discussions in 2017

Mesoscale Discussion 692

May 10, 201721 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 10, 2017, 8:31 PM CDT for 21 counties in Texas. It was in force for 119 min.

The area

The outline as issued.

The facts

Issued
May 10, 2017, 8:31 PM CDT (01:31 UTC)
Expired
May 10, 2017, 10:30 PM CDT
In force
119 min
Issued by
the Storm Prediction Center
Chance of a watch
40%
All 21 counties

Callahan County, TX, Coke County, TX, Coleman County, TX, Concho County, TX, Crockett County, TX, Edwards County, TX, Irion County, TX, Jones County, TX, Kinney County, TX, Menard County, TX, Nolan County, TX, Reagan County, TX, Runnels County, TX, Schleicher County, TX, Sterling County, TX, Sutton County, TX, Taylor County, TX, Terrell County, TX, Tom Green County, TX, Upton County, TX, Val Verde County, TX

The radar

The San Angelo radar (KSJT), 91 km from the middle of the area, began a volume at 01:31 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, 1.5 hours before the alert went out and 138 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 2017-05-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1530 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 2017-05-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 93 square meters per square second.1939587897Sfc1 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
1530 J/kg
Mixed-layer CIN
-50 J/kg
Mixed-layer LCL
1468 m above ground
0-6 km bulk shear
61 kt
0-1 km storm-relative helicity
93 m²/s²
0-3 km storm-relative helicity
180 m²/s²
Significant tornado parameter
0.8
Supercell composite
6.4

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 11, 1:37 PM CDTMesoscale DiscussionSPCAnderson, Angelina, Bowie, Camp, Cass, Cherokee and 31 more2 hr
May 11, 2:43 PM CDTSevere Thunderstorm WatchSPCAnderson, Angelina, Bastrop, Bowie, Brazos, Burleson and 54 more9 hr
May 11, 6:20 PM CDTMesoscale DiscussionSPCAnderson, Cherokee, Gregg, Harrison, Marion, Panola and 3 more115 min

Nearby

Mesoscale Discussions in Texas, 2017Every mesoscale discussion in 2017

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.