Alert archive / Texas / Mesoscale Discussions in 2016

Mesoscale Discussion 429

April 21, 201625 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 21, 2016, 1:16 AM CDT for 25 counties in Texas. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued: Apr 21, 2016, 1:16 AM CDT (06:16 UTC)
Expired: Apr 21, 2016, 2:45 AM CDT
In force: 89 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

All 25 counties

Borden County, TX, Callahan County, TX, Coke County, TX, Coleman County, TX, Dawson County, TX, Fisher County, TX, Gaines County, TX, Garza County, TX, Haskell County, TX, Howard County, TX, Jones County, TX, Kent County, TX, Lynn County, TX, Martin County, TX, Mitchell County, TX, Nolan County, TX, Runnels County, TX, Scurry County, TX, Shackelford County, TX, Stephens County, TX, Sterling County, TX, Stonewall County, TX, Taylor County, TX, Terry County, TX, Throckmorton County, TX

The radar

The Dyess AFB radar (KDYX), 119 km from the middle of the area, began a volume at 06:20 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 100Apr 21, 1:45 AM CDT

The nearest sounding before it

Midland Regional, TX (KMAF), launched 00:00Z, 6.3 hours before the alert went out and 172 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: 1 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2940 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: -1 m²/s²
0-3 km storm-relative helicity: 97 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
Apr 20, 8:17 PM CDT	Severe Thunderstorm Watch	SPC	Armstrong, Baylor, Briscoe, Carson, Childress, Collingsworth and 23 more	6 hr
Apr 20, 8:22 PM CDT	Mesoscale Discussion	SPC	Duval, Jim Hogg, Starr, Webb, Zapata	83 min
Apr 20, 9:40 PM CDT	Mesoscale Discussion	SPC	Cottle, Crosby, Dickens, Fisher, Foard, Garza and 7 more	65 min
Apr 20, 11:35 PM CDT	Mesoscale Discussion	SPC	Crosby, Fisher, Garza, Haskell, Jones, Kent and 5 more	55 min
Apr 21, 1:44 AM CDT	Severe Thunderstorm Watch	SPC	Borden, Coke, Dawson, Gaines, Glasscock, Howard and 7 more	4 hr
Apr 21, 4:57 AM CDT	Mesoscale Discussion	SPC	Coke, Coleman, Concho, Runnels, Taylor, Tom Green	93 min
Apr 21, 9:40 AM CDT	Mesoscale Discussion	SPC	Brazoria, Chambers, Hardin, Liberty, Tyler	2 hr
Apr 21, 2:14 PM CDT	Mesoscale Discussion	SPC	Cameron, Hidalgo, Kenedy, Willacy	2 hr
Apr 21, 2:36 PM CDT	Mesoscale Discussion	SPC	Brewster, Crockett, Edwards, Pecos, Terrell, Val Verde	2 hr

Nearby

Mesoscale Discussions in Texas, 2016 Every mesoscale discussion in 2016

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.