Alert archive / Texas / Mesoscale Discussions in 2015

Mesoscale Discussion 833

May 29, 201518 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 29, 2015, 1:22 AM CDT for 18 counties in Texas. It was in force for 83 min.

The area

The outline as issued.

The facts

Issued: May 29, 2015, 1:22 AM CDT (06:22 UTC)
Expired: May 29, 2015, 2:45 AM CDT
In force: 83 min
Issued by: the Storm Prediction Center

Counties Atascosa County, TX, Bee County, TX, Brooks County, TX, Dimmit County, TX, Duval County, TX, Hidalgo County, TX, Jim Hogg County, TX, Jim Wells County, TX, Karnes County, TX, Kenedy County, TX, Kleberg County, TX, La Salle County, TX, Live Oak County, TX, McMullen County, TX, Nueces County, TX, San Patricio County, TX, Starr County, TX, Webb County, TX

The nearest sounding before it

Corpus Christi, TX (KCRP), launched 00:00Z, 6.4 hours before the alert went out and 124 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: 2420 J/kg
Mixed-layer CIN: -47 J/kg
Mixed-layer LCL: 985 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: -22 m²/s²
0-3 km storm-relative helicity: 16 m²/s²
Significant tornado parameter: -0.3
Supercell composite: -2.3

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 28, 7:58 PM CDT	Severe Thunderstorm Watch	SPC	Bandera, Blanco, Coleman, Concho, Crockett, Edwards and 16 more	5 hr
May 28, 9:58 PM CDT	Mesoscale Discussion	SPC	Atascosa, Bandera, Bastrop, Bee, Bell, Bexar and 68 more	2 hr
May 28, 10:19 PM CDT	Severe Thunderstorm Watch	SPC	Atascosa, Bastrop, Bexar, Burnet, Caldwell, Comal and 20 more	7 hr
May 29, 12:33 PM CDT	Mesoscale Discussion	SPC	Bowie, Cass, Gregg, Harrison, Marion, Morris and 5 more	87 min
May 29, 2:27 PM CDT	Mesoscale Discussion	SPC	Dallam, Deaf Smith, Hartley, Oldham, Parmer	93 min
May 29, 3:44 PM CDT	Severe Thunderstorm Watch	SPC	Bailey, Castro, Dallam, Deaf Smith, Hale, Hartley and 8 more	7 hr
May 29, 4:48 PM CDT	Mesoscale Discussion	SPC	Bowie, Red River	87 min

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.