Alert archive / Texas / Mesoscale Discussions in 2017

Mesoscale Discussion 737

May 16, 201720 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 16, 2017, 5:29 PM CDT for 20 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: May 16, 2017, 5:29 PM CDT (22:29 UTC)
Expired: May 16, 2017, 7:30 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 80%

Counties Borden County, TX, Coke County, TX, Crockett County, TX, Fisher County, TX, Garza County, TX, Glasscock County, TX, Howard County, TX, Irion County, TX, Kent County, TX, Martin County, TX, Midland County, TX, Mitchell County, TX, Nolan County, TX, Reagan County, TX, Scurry County, TX, Sterling County, TX, Stonewall County, TX, Terrell County, TX, Upton County, TX, Val Verde County, TX

The radar

The Midland/Odessa radar (KMAF), 85 km from the middle of the area, began a volume at 22:31 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 226May 16, 7:30 PM CDT

The nearest sounding before it

Amarillo Airport, TX (KAMA), launched 12:00Z, 10.5 hours before the alert went out and 426 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 837 J/kg
Mixed-layer CIN: -240 J/kg
Mixed-layer LCL: 1292 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 4 m²/s²
0-3 km storm-relative helicity: 88 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

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.

Issued	Product	Office	Counties	Lasted
May 16, 1:19 PM CDT	Mesoscale Discussion	SPC	Briscoe, Carson, Childress, Collingsworth, Donley, Gray and 7 more	56 min
May 16, 1:54 PM CDT	Tornado Watch PDS	SPC	Armstrong, Baylor, Briscoe, Carson, Childress, Collingsworth and 20 more	8 hr
May 16, 3:36 PM CDT	Mesoscale Discussion	SPC	Armstrong, Briscoe, Carson, Childress, Collingsworth, Cottle and 15 more	54 min
May 16, 4:56 PM CDT	Mesoscale Discussion	SPC	Collingsworth, Wheeler	64 min

Nearby

Mesoscale Discussions in Texas, 2017 Every 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.