Alert archive / Texas / Mesoscale Discussions in 2015

Mesoscale Discussion 787

May 26, 201510 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 26, 2015, 3:54 PM CDT for 10 counties in Texas. It was in force for 66 min.

The area

The outline as issued.

The facts

Issued: May 26, 2015, 3:54 PM CDT (20:54 UTC)
Expired: May 26, 2015, 5:00 PM CDT
In force: 66 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

Counties Coke County, TX, Crockett County, TX, Irion County, TX, Reagan County, TX, Schleicher County, TX, Sterling County, TX, Sutton County, TX, Terrell County, TX, Tom Green County, TX, Val Verde County, TX

The radar

The San Angelo radar (KSJT), 127 km from the middle of the area, began a volume at 20:54 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 224May 26, 5:20 PM CDT

The nearest sounding before it

Del Rio, TX (KDLF), launched 12:00Z, 8.9 hours before the alert went out and 138 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: 3835 J/kg
Mixed-layer CIN: -15 J/kg
Mixed-layer LCL: 628 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 84 m²/s²
0-3 km storm-relative helicity: 83 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 3.1

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 25, 8:05 PM CDT	Mesoscale Discussion	SPC	Angelina, Austin, Brazoria, Chambers, Colorado, DeWitt and 22 more	85 min
May 25, 11:13 PM CDT	Mesoscale Discussion	SPC	Austin, Bastrop, Bee, Brazoria, Caldwell, Calhoun and 26 more	92 min
May 26, 1:35 PM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Callahan, Clay, Coke, Coleman and 21 more	85 min
May 26, 2:53 PM CDT	Tornado Watch	SPC	Archer, Baylor, Callahan, Clay, Comanche, Eastland and 22 more	7 hr
May 26, 5:23 PM CDT	Severe Thunderstorm Watch	SPC	Brown, Coke, Coleman, Concho, Crockett, Glasscock and 14 more	4 hr
May 26, 5:42 PM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Callahan, Clay, Eastland, Erath and 14 more	93 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.