Alert archive / Texas / Mesoscale Discussions in 2016

Mesoscale Discussion 645

May 17, 201619 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 17, 2016, 9:33 PM CDT for 19 counties in Texas. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued: May 17, 2016, 9:33 PM CDT (02:33 UTC)
Expired: May 17, 2016, 11:00 PM CDT
In force: 87 min
Issued by: the Storm Prediction Center

Counties Atascosa County, TX, Bandera County, TX, Bexar County, TX, Blanco County, TX, Comal County, TX, Dimmit County, TX, Edwards County, TX, Frio County, TX, Gillespie County, TX, Kendall County, TX, Kerr County, TX, Kimble County, TX, Kinney County, TX, Maverick County, TX, Medina County, TX, Real County, TX, Uvalde County, TX, Val Verde County, TX, Zavala County, TX

The radar

The Laughlin AFB radar (KDFX), 32 km from the middle of the area, began a volume at 02:36 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, 2.6 hours before the alert went out and 87 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: 1719 J/kg
Mixed-layer CIN: -134 J/kg
Mixed-layer LCL: 1217 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 18 m²/s²
0-3 km storm-relative helicity: 106 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.3

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 17, 8:52 PM CDT	Mesoscale Discussion	SPC	Brooks, Duval, Hidalgo, Jim Hogg, Starr, Zapata	53 min
May 17, 11:55 PM CDT	Mesoscale Discussion	SPC	Atascosa, Bandera, Bexar, Caldwell, Comal, Dimmit and 12 more	65 min
May 18, 12:09 PM CDT	Mesoscale Discussion	SPC	Brooks, Jim Hogg, Zapata	96 min
May 18, 2:49 PM CDT	Mesoscale Discussion	SPC	El Paso	2 hr
May 18, 5:43 PM CDT	Mesoscale Discussion	SPC	El Paso, Hudspeth, Presidio	62 min

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.