Alert archive / Texas / Mesoscale Discussions in 2013

Mesoscale Discussion 588

May 1, 20136 counties in Oklahoma; 9 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 1, 2013, 3:43 PM CDT for 6 counties in Oklahoma; 9 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: May 1, 2013, 3:43 PM CDT (20:43 UTC)
Expired: May 1, 2013, 5:45 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 40%

Counties Comanche County, OK, Cotton County, OK, Jackson County, OK, Kiowa County, OK, Tillman County, OK, Washita County, OK, Archer County, TX, Baylor County, TX, Haskell County, TX, Shackelford County, TX, Stephens County, TX, Throckmorton County, TX, Wichita County, TX, Wilbarger County, TX, Young County, TX

The radar

The Altus AFB radar (KFDR), 63 km from the middle of the area, began a volume at 20:46 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 146May 1, 4:55 PM CDT

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 8.7 hours before the alert went out and 201 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: 690 J/kg
Mixed-layer CIN: -363 J/kg
Mixed-layer LCL: 677 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: -42 m²/s²
0-3 km storm-relative helicity: 85 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 1, 4:55 PM CDT	Severe Thunderstorm Watch	SPC	Comanche, Cotton, Kiowa, Tillman	7 hr
May 1, 3:34 PM CDT	Mesoscale Discussion	SPC	Bandera, Blanco, Brown, Burnet, Callahan, Coke and 22 more	86 min

Nearby

Mesoscale Discussions in Texas, 2013 Mesoscale Discussions in Oklahoma, 2013 Every mesoscale discussion in 2013

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.