Alert archive / Texas / Mesoscale Discussions in 2015

Mesoscale Discussion 1875

October 22, 20159 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Oct 22, 2015, 5:47 PM CDT for 9 counties in Texas. It was in force for 58 min.

The area

The outline as issued.

The facts

Issued: Oct 22, 2015, 5:47 PM CDT (22:47 UTC)
Expired: Oct 22, 2015, 6:45 PM CDT
In force: 58 min
Issued by: the Storm Prediction Center
Chance of a watch: 80%

Counties Concho County, TX, Crockett County, TX, Edwards County, TX, Kimble County, TX, Menard County, TX, Schleicher County, TX, Sutton County, TX, Tom Green County, TX, Val Verde County, TX

The radar

The San Angelo radar (KSJT), 98 km from the middle of the area, began a volume at 22:51 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 519Oct 22, 6:00 PM CDT

The nearest sounding before it

Del Rio, TX (KDLF), launched 12:00Z, 10.8 hours before the alert went out and 129 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: 1091 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 560 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 148 m²/s²
0-3 km storm-relative helicity: 324 m²/s²
Significant tornado parameter: 1.1
Supercell composite: 6.1

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
Oct 21, 8:48 PM CDT	Mesoscale Discussion	SPC	Andrews, Cochran, Dawson, Ector, Gaines, Loving and 7 more	87 min
Oct 21, 11:31 PM CDT	Mesoscale Discussion	SPC	Andrews, Borden, Crane, Dawson, Ector, Gaines and 11 more	59 min
Oct 22, 1:06 AM CDT	Tornado Watch	SPC	Andrews, Borden, Brewster, Briscoe, Childress, Coke and 32 more	8 hr
Oct 22, 3:51 AM CDT	Mesoscale Discussion	SPC	Baylor, Childress, Coke, Collingsworth, Cottle, Crockett and 22 more	99 min
Oct 22, 1:56 PM CDT	Mesoscale Discussion	SPC	Brewster, Callahan, Coke, Coleman, Concho, Crockett and 15 more	2 hr
Oct 22, 6:02 PM CDT	Severe Thunderstorm Watch	SPC	Concho, Crockett, Edwards, Irion, Kimble, Menard and 4 more	3 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.