Alert archive / Texas / Mesoscale Discussions in 2015

Mesoscale Discussion 429

April 23, 201516 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 23, 2015, 9:34 PM CDT for 16 counties in Texas. It was in force for 56 min.

The area

The outline as issued.

The facts

Issued: Apr 23, 2015, 9:34 PM CDT (02:34 UTC)
Expired: Apr 23, 2015, 10:30 PM CDT
In force: 56 min
Issued by: the Storm Prediction Center
Chance of a watch: 60%

Counties Bandera County, TX, Dimmit County, TX, Edwards County, TX, Frio County, TX, Jim Hogg County, TX, Kinney County, TX, La Salle County, TX, Maverick County, TX, Medina County, TX, Real County, TX, Starr County, TX, Uvalde County, TX, Val Verde County, TX, Webb County, TX, Zapata County, TX, Zavala County, TX

The radar

The Laughlin AFB radar (KDFX), 102 km from the middle of the area, began a volume at 02:35 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 134 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: 1325 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 1694 m above ground
0-6 km bulk shear: 67 kt
0-1 km storm-relative helicity: 23 m²/s²
0-3 km storm-relative helicity: 214 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.8

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
Apr 24, 2:36 AM CDT	Mesoscale Discussion	SPC	Dimmit, La Salle, McMullen, Webb, Zavala	84 min
Apr 24, 3:01 AM CDT	Severe Thunderstorm Watch	SPC	Atascosa, Dimmit, Frio, La Salle, Live Oak, McMullen and 5 more	4 hr
Apr 24, 5:41 AM CDT	Mesoscale Discussion	SPC	Atascosa, Bandera, Dimmit, Duval, Edwards, Frio and 10 more	94 min
Apr 24, 10:29 AM CDT	Mesoscale Discussion	SPC	Hardin, Jasper, Liberty, Newton, Orange, Tyler	91 min
Apr 24, 11:12 AM CDT	Mesoscale Discussion	SPC	Bosque, Brown, Callahan, Coke, Coleman, Collin and 43 more	2 hr
Apr 24, 11:53 AM CDT	Mesoscale Discussion	SPC	Hardin, Jefferson, Newton, Orange	97 min
Apr 24, 12:18 PM CDT	Tornado Watch	SPC	Jasper, Newton, Orange	5 hr
Apr 24, 12:56 PM CDT	Mesoscale Discussion	SPC	Childress, Collingsworth, Cottle, Crosby, Dickens, Foard and 3 more	94 min
Apr 24, 2:10 PM CDT	Tornado Watch	SPC	Anderson, Bell, Bosque, Brown, Callahan, Coke and 52 more	8 hr
Apr 24, 3:58 PM CDT	Mesoscale Discussion	SPC	Angelina, Camp, Cass, Cherokee, Gregg, Harrison and 16 more	92 min
Apr 24, 4:45 PM CDT	Tornado Watch	SPC	Angelina, Bowie, Camp, Cass, Cherokee, Franklin and 20 more	5 hr
Apr 24, 4:56 PM CDT	Mesoscale Discussion	SPC	Atascosa, Dimmit, Duval, Frio, Jim Hogg, Kinney and 9 more	94 min
Apr 24, 6:01 PM CDT	Mesoscale Discussion	SPC	Dallas, Ellis, Erath, Hood, Johnson, Kaufman and 3 more	59 min
Apr 24, 6:53 PM CDT	Severe Thunderstorm Watch	SPC	Atascosa, Bee, Brooks, Cameron, DeWitt, Dimmit and 19 more	6 hr

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.