Alert archive / Texas / Mesoscale Discussions in 2015

Mesoscale Discussion 1902

October 30, 201518 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Oct 30, 2015, 8:22 PM CDT for 18 counties in Texas. It was in force for 113 min.

The area

The outline as issued.

The facts

Issued: Oct 30, 2015, 8:22 PM CDT (01:22 UTC)
Expired: Oct 30, 2015, 10:15 PM CDT
In force: 113 min
Issued by: the Storm Prediction Center

Counties Bandera County, TX, Dimmit County, TX, Edwards County, TX, Gillespie County, TX, Kerr County, TX, Kimble County, TX, Kinney County, TX, Mason County, TX, Maverick County, TX, McCulloch County, TX, Medina County, TX, Menard County, TX, Real County, TX, Schleicher County, TX, Sutton County, TX, Uvalde County, TX, Val Verde County, TX, Zavala County, TX

The radar

The Laughlin AFB radar (KDFX), 76 km from the middle of the area, began a volume at 01:24 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, 1.4 hours before the alert went out and 102 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: 1815 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 1026 m above ground
0-6 km bulk shear: 69 kt
0-1 km storm-relative helicity: 103 m²/s²
0-3 km storm-relative helicity: 183 m²/s²
Significant tornado parameter: 2.0
Supercell composite: 8.7

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Oct 30, 11:15 PM CDT	Mesoscale Discussion	SPC	Bandera, Blanco, Edwards, Gillespie, Kendall, Kerr and 7 more	2 hr
Oct 31, 1:17 AM CDT	Mesoscale Discussion	SPC	Bastrop, Bexar, Blanco, Burnet, Caldwell, Comal and 6 more	58 min
Oct 31, 1:51 AM CDT	Mesoscale Discussion	SPC	Austin, Brazoria, Chambers, Colorado, Fort Bend, Harris and 3 more	114 min
Oct 31, 2:57 AM CDT	Tornado Watch	SPC	Brazoria, Chambers, Fort Bend, Galveston, Hardin, Harris and 5 more	9 hr
Oct 31, 4:46 AM CDT	Mesoscale Discussion	SPC	Brazoria, Chambers	119 min
Oct 31, 6:54 AM CDT	Tornado Watch	SPC	Jasper, Newton	5 hr
Oct 31, 7:35 AM CDT	Mesoscale Discussion	SPC	Chambers, Jefferson	85 min
Oct 31, 10:03 AM CDT	Mesoscale Discussion	SPC	Brazoria, Chambers, Fort Bend, Galveston, Hardin, Harris and 6 more	57 min

Nearby

Mesoscale Discussions in Texas, 2015 Every mesoscale discussion in 2015

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.