Alert archive / Texas / Mesoscale Discussions in 2016

Mesoscale Discussion 1699

September 16, 201617 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Sep 16, 2016, 2:29 PM CDT for 17 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Sep 16, 2016, 2:29 PM CDT (19:29 UTC)
Expired: Sep 16, 2016, 4:30 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 40%

Counties Andrews County, TX, Borden County, TX, Dawson County, TX, Dickens County, TX, Fisher County, TX, Gaines County, TX, Garza County, TX, Howard County, TX, Kent County, TX, King County, TX, Lynn County, TX, Martin County, TX, Mitchell County, TX, Scurry County, TX, Stonewall County, TX, Terry County, TX, Yoakum County, TX

The radar

The Lubbock radar (KLBB), 73 km from the middle of the area, began a volume at 19:31 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 478Sep 16, 4:35 PM CDT

The nearest sounding before it

Midland Regional, TX (KMAF), launched 12:00Z, 7.5 hours before the alert went out and 121 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: 995 J/kg
Mixed-layer CIN: -49 J/kg
Mixed-layer LCL: 656 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 262 m²/s²
0-3 km storm-relative helicity: 313 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 8.2

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
Sep 16, 2:40 PM CDT	Mesoscale Discussion	SPC	Jeff Davis, Pecos, Reeves, Ward	65 min
Sep 16, 4:34 PM CDT	Severe Thunderstorm Watch	SPC	Andrews, Borden, Callahan, Coke, Dawson, Ector and 14 more	5 hr

Nearby

Mesoscale Discussions in Texas, 2016 Every mesoscale discussion in 2016

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.