Alert archive / Texas / Mesoscale Discussions in 2015

Mesoscale Discussion 242

April 8, 201517 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 8, 2015, 6:40 PM CDT for 17 counties in Texas. It was in force for 65 min.

The area

The outline as issued.

The facts

Issued: Apr 8, 2015, 6:40 PM CDT (23:40 UTC)
Expired: Apr 8, 2015, 7:45 PM CDT
In force: 65 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

Counties Borden County, TX, Cottle County, TX, Dickens County, TX, Fisher County, TX, Foard County, TX, Garza County, TX, Glasscock County, TX, Howard County, TX, Kent County, TX, King County, TX, Knox County, TX, Martin County, TX, Midland County, TX, Mitchell County, TX, Reagan County, TX, Scurry County, TX, Stonewall County, TX

The radar

The Lubbock radar (KLBB), 123 km from the middle of the area, began a volume at 23:43 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 38Apr 8, 7:25 PM CDT

The nearest sounding before it

Midland Regional, TX (KMAF), launched 12:00Z, 11.7 hours before the alert went out and 174 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: 1352 J/kg
Mixed-layer CIN: -246 J/kg
Mixed-layer LCL: 1668 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 212 m²/s²
0-3 km storm-relative helicity: 221 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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 8, 3:37 PM CDT	Tornado Watch	SPC	Childress, Collingsworth, Hall, Hardeman	8 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.