Alert archive / Texas / Mesoscale Discussions in 2015

Mesoscale Discussion 504

May 4, 201510 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 4, 2015, 5:58 PM CDT for 10 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: May 4, 2015, 5:58 PM CDT (22:58 UTC)
Expired: May 4, 2015, 8:00 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Brewster County, TX, Crane County, TX, Ector County, TX, Loving County, TX, Pecos County, TX, Reeves County, TX, Terrell County, TX, Val Verde County, TX, Ward County, TX, Winkler County, TX

The radar

The Midland/Odessa radar (KMAF), 211 km from the middle of the area, began a volume at 23:00 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.

Tornado Watch 131May 4, 7:55 PM CDT

The nearest sounding before it

Midland Regional, TX (KMAF), launched 12:00Z, 11.0 hours before the alert went out and 212 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: 419 J/kg
Mixed-layer CIN: -200 J/kg
Mixed-layer LCL: 1214 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 128 m²/s²
0-3 km storm-relative helicity: 121 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 4, 1:28 PM CDT	Mesoscale Discussion	SPC	Andrews, Brewster, Crane, Culberson, Ector, Gaines and 7 more	92 min
May 4, 1:45 PM CDT	Mesoscale Discussion	SPC	Carson, Dallam, Deaf Smith, Hansford, Hartley, Hutchinson and 5 more	2 hr
May 4, 1:58 PM CDT	Severe Thunderstorm Watch	SPC	Culberson, Jeff Davis	6 hr
May 4, 2:07 PM CDT	Tornado Watch	SPC	Brewster, Crane, Loving, Pecos, Reeves, Terrell and 2 more	6 hr
May 4, 2:08 PM CDT	Severe Thunderstorm Watch	SPC	Hudspeth	112 days
May 4, 3:27 PM CDT	Mesoscale Discussion	SPC	Andrews, Bailey, Cochran, Culberson, Gaines, Hockley and 5 more	93 min
May 4, 3:46 PM CDT	Mesoscale Discussion	SPC	Brewster, Crane, Loving, Pecos, Reeves, Ward and 1 more	59 min
May 4, 6:27 PM CDT	Mesoscale Discussion	SPC	Culberson, Hudspeth, Jeff Davis, Loving, Reeves	2 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.