Alert archive / Texas / Mesoscale Discussions in 2014

Mesoscale Discussion 241

April 1, 20146 counties in Oklahoma; 18 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 1, 2014, 3:34 PM CDT for 6 counties in Oklahoma; 18 counties in Texas. It was in force for 116 min.

The area

The outline as issued.

The facts

Issued: Apr 1, 2014, 3:34 PM CDT (20:34 UTC)
Expired: Apr 1, 2014, 5:30 PM CDT
In force: 116 min
Issued by: the Storm Prediction Center
Chance of a watch: 60%

All 24 counties

Carter County, OK, Cotton County, OK, Jefferson County, OK, Love County, OK, Murray County, OK, Stephens County, OK, Archer County, TX, Baylor County, TX, Callahan County, TX, Clay County, TX, Cooke County, TX, Haskell County, TX, Jack County, TX, Jones County, TX, Knox County, TX, Montague County, TX, Shackelford County, TX, Stephens County, TX, Stonewall County, TX, Taylor County, TX, Throckmorton County, TX, Wichita County, TX, Wise County, TX, Young County, TX

The radar

The Dyess AFB radar (KDYX), 98 km from the middle of the area, began a volume at 20:33 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 45Apr 1, 6:25 PM CDT

The nearest sounding before it

Amarillo Airport, TX (KAMA), launched 12:00Z, 8.6 hours before the alert went out and 338 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1867 m above ground
0-6 km bulk shear: 69 kt
0-1 km storm-relative helicity: 650 m²/s²
0-3 km storm-relative helicity: 773 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 1, 6:23 PM CDT	Severe Thunderstorm Watch	SPC	Caddo, Carter, Cleveland, Comanche, Cotton, Garvin and 12 more	5 hr

Nearby

Mesoscale Discussions in Texas, 2014 Mesoscale Discussions in Oklahoma, 2014 Every mesoscale discussion in 2014

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.