Alert archive / Texas / Mesoscale Discussions in 2019

Mesoscale Discussion 537

May 4, 201918 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 4, 2019, 7:48 PM CDT for 18 counties in Texas. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued: May 4, 2019, 7:48 PM CDT (00:48 UTC)
Expired: May 4, 2019, 9:15 PM CDT
In force: 87 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

Counties Bailey County, TX, Castro County, TX, Cochran County, TX, Deaf Smith County, TX, Gaines County, TX, Hansford County, TX, Hartley County, TX, Hockley County, TX, Hutchinson County, TX, Lamb County, TX, Moore County, TX, Oldham County, TX, Parmer County, TX, Potter County, TX, Randall County, TX, Sherman County, TX, Terry County, TX, Yoakum County, TX

The radar

The Amarillo radar (KAMA), 45 km from the middle of the area, began a volume at 00:51 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 nearest sounding before it

Amarillo Airport, TX (KAMA), launched 00:00Z, 0.8 hours before the alert went out and 45 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: 408 J/kg
Mixed-layer CIN: -159 J/kg
Mixed-layer LCL: 1456 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 85 m²/s²
0-3 km storm-relative helicity: 189 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.0

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 5, 3:01 PM CDT	Mesoscale Discussion	SPC	Armstrong, Bailey, Briscoe, Carson, Castro, Childress and 36 more	119 min
May 5, 3:04 PM CDT	Mesoscale Discussion	SPC	Andrews, Brewster, Crane, Crockett, Ector, Gaines and 13 more	116 min
May 5, 3:55 PM CDT	Severe Thunderstorm Watch	SPC	Armstrong, Bailey, Briscoe, Carson, Castro, Childress and 38 more	7 hr
May 5, 4:03 PM CDT	Severe Thunderstorm Watch	SPC	Andrews, Borden, Brewster, Crane, Crockett, Dawson and 16 more	7 hr
May 5, 6:14 PM CDT	Mesoscale Discussion	SPC	Andrews, Armstrong, Borden, Briscoe, Carson, Castro and 40 more	91 min

Nearby

Mesoscale Discussions in Texas, 2019 Every mesoscale discussion in 2019

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.