Alert archive / Texas / Mesoscale Discussions in 2018

Mesoscale Discussion 1603

October 31, 201819 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Oct 31, 2018, 5:32 PM CDT for 19 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Oct 31, 2018, 5:32 PM CDT (22:32 UTC)
Expired: Oct 31, 2018, 8:00 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 40%

Counties Atascosa County, TX, Bandera County, TX, Bexar County, TX, Dimmit County, TX, Edwards County, TX, Frio County, TX, Guadalupe County, TX, Karnes County, TX, Kinney County, TX, La Salle County, TX, Maverick County, TX, McMullen County, TX, Medina County, TX, Real County, TX, Terrell County, TX, Uvalde County, TX, Val Verde County, TX, Wilson County, TX, Zavala County, TX

The radar

The Laughlin AFB radar (KDFX), 34 km from the middle of the area, began a volume at 22:32 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 12:00Z, 10.5 hours before the alert went out and 90 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: 1529 J/kg
Mixed-layer CIN: -126 J/kg
Mixed-layer LCL: 534 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 143 m²/s²
0-3 km storm-relative helicity: 223 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 1.6

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
Oct 31, 7:20 AM CDT	Mesoscale Discussion	SPC	Bosque, Brown, Burnet, Callahan, Coke, Coleman and 34 more	2 hr
Oct 31, 1:36 PM CDT	Mesoscale Discussion	SPC	Brewster, Culberson, El Paso, Hudspeth, Jeff Davis, Pecos and 4 more	114 min
Oct 31, 2:14 PM CDT	Mesoscale Discussion	SPC	Anderson, Angelina, Aransas, Austin, Bastrop, Brazoria and 50 more	3 hr
Oct 31, 3:02 PM CDT	Tornado Watch	SPC	Anderson, Angelina, Austin, Bastrop, Bowie, Brazoria and 57 more	9 hr
Oct 31, 6:14 PM CDT	Mesoscale Discussion	SPC	Anderson, Angelina, Austin, Bowie, Brazos, Burleson and 41 more	61 min

Nearby

Mesoscale Discussions in Texas, 2018 Every mesoscale discussion in 2018

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.