Alert archive / Texas / Mesoscale Discussions in 2015

Mesoscale Discussion 422

April 22, 201535 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 22, 2015, 6:45 PM CDT for 35 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Apr 22, 2015, 6:45 PM CDT (23:45 UTC)
Expired: Apr 22, 2015, 8:45 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 35 counties

Archer County, TX, Armstrong County, TX, Baylor County, TX, Briscoe County, TX, Carson County, TX, Castro County, TX, Childress County, TX, Cottle County, TX, Crosby County, TX, Deaf Smith County, TX, Dickens County, TX, Donley County, TX, Fisher County, TX, Floyd County, TX, Foard County, TX, Hale County, TX, Hall County, TX, Hardeman County, TX, Haskell County, TX, Jones County, TX, Kent County, TX, King County, TX, Knox County, TX, Motley County, TX, Nolan County, TX, Potter County, TX, Randall County, TX, Shackelford County, TX, Stonewall County, TX, Swisher County, TX, Taylor County, TX, Throckmorton County, TX, Wichita County, TX, Wilbarger County, TX, Young County, TX

The radar

The Lubbock radar (KLBB), 116 km from the middle of the area, began a volume at 23:47 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 96Apr 22, 10:25 PM CDT

The nearest sounding before it

Amarillo Airport, TX (KAMA), launched 12:00Z, 11.8 hours before the alert went out and 169 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: 10 J/kg
Mixed-layer CIN: -339 J/kg
Mixed-layer LCL: 2161 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: -146 m²/s²
0-3 km storm-relative helicity: -127 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
Apr 22, 2:55 AM CDT	Mesoscale Discussion	SPC	Hemphill, Wheeler	3 hr
Apr 22, 10:43 AM CDT	Mesoscale Discussion	SPC	Aransas, Atascosa, Austin, Bandera, Bastrop, Bee and 36 more	2 hr
Apr 22, 11:13 AM CDT	Tornado Watch	SPC	Aransas, Bee, Calhoun, Duval, Goliad, Jim Wells and 7 more	7 hr
Apr 22, 12:07 PM CDT	Mesoscale Discussion	SPC	Jim Wells, Nueces	83 min
Apr 22, 1:43 PM CDT	Mesoscale Discussion	SPC	Atascosa, Austin, Bandera, Bastrop, Bexar, Caldwell and 15 more	92 min
Apr 22, 2:07 PM CDT	Mesoscale Discussion	SPC	Archer, Armstrong, Baylor, Briscoe, Castro, Childress and 25 more	2 hr
Apr 22, 2:29 PM CDT	Mesoscale Discussion	SPC	Aransas, Bee, Calhoun, Duval, Goliad, Jim Wells and 5 more	61 min
Apr 22, 2:56 PM CDT	Tornado Watch	SPC	Archer, Armstrong, Bailey, Baylor, Briscoe, Callahan and 36 more	9 hr
Apr 22, 5:48 PM CDT	Mesoscale Discussion	SPC	Bosque, Comanche, Coryell, Ellis, Erath, Hamilton and 8 more	117 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; radar from the NEXRAD Level II archive.