Alert archive / Texas / Mesoscale Discussions in 2015

Mesoscale Discussion 574

May 9, 20158 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 9, 2015, 8:06 PM CDT for 8 counties in Texas. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued: May 9, 2015, 8:06 PM CDT (01:06 UTC)
Expired: May 9, 2015, 9:30 PM CDT
In force: 84 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

Counties Dimmit County, TX, Frio County, TX, Kinney County, TX, La Salle County, TX, Maverick County, TX, Uvalde County, TX, Webb County, TX, Zavala County, TX

The radar

The Laughlin AFB radar (KDFX), 105 km from the middle of the area, began a volume at 01:10 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, 1.1 hours before the alert went out and 149 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: 2997 J/kg
Mixed-layer CIN: -56 J/kg
Mixed-layer LCL: 1690 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 70 m²/s²
0-3 km storm-relative helicity: 262 m²/s²
Significant tornado parameter: 1.2
Supercell composite: 17.4

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
May 9, 7:49 PM CDT	Mesoscale Discussion	SPC	Collin, Cooke, Dallas, Delta, Denton, Eastland and 17 more	56 min
May 9, 9:38 PM CDT	Mesoscale Discussion	SPC	Brown, Callahan, Coke, Coleman, Comanche, Concho and 12 more	2 hr
May 9, 10:51 PM CDT	Severe Thunderstorm Watch	SPC	Bosque, Brown, Callahan, Coke, Coleman, Comanche and 33 more	10 hr
May 10, 2:06 AM CDT	Mesoscale Discussion	SPC	Brown, Callahan, Coleman, Concho, Crockett, Irion and 6 more	54 min
May 10, 2:55 AM CDT	Severe Thunderstorm Watch	SPC	Bosque, Collin, Comanche, Coryell, Dallas, Denton and 22 more	6 hr
May 10, 4:20 AM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Brown, Clay, Collin, Comanche and 28 more	55 min
May 10, 6:44 AM CDT	Mesoscale Discussion	SPC	Bowie, Camp, Collin, Dallas, Delta, Denton and 15 more	2 hr
May 10, 9:28 AM CDT	Tornado Watch	SPC	Bowie, Red River	6 hr
May 10, 9:49 AM CDT	Mesoscale Discussion	SPC	Bell, Blanco, Bosque, Brown, Burnet, Camp and 49 more	2 hr
May 10, 10:19 AM CDT	Tornado Watch	SPC	Anderson, Bandera, Bell, Blanco, Bosque, Bowie and 68 more	13 hr
May 10, 12:33 PM CDT	Mesoscale Discussion	SPC	Archer, Clay, Montague	2 hr
May 10, 2:42 PM CDT	Mesoscale Discussion	SPC	Bandera, Bell, Blanco, Bosque, Bowie, Brown and 58 more	2 hr
May 10, 6:15 PM CDT	Mesoscale Discussion	SPC	Bell, Bowie, Burnet, Camp, Cass, Collin and 33 more	90 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.