Alert archive / Texas / Mesoscale Discussions in 2012

Mesoscale Discussion 492

April 11, 2012Baca County, Colorado; Cimarron County, Oklahoma; 13 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 11, 2012, 5:08 PM MDT for Baca County, Colorado; Cimarron County, Oklahoma; 13 counties in Texas. It was in force for 97 min.

The area

The outline as issued.

The facts

Issued: Apr 11, 2012, 5:08 PM MDT (23:08 UTC)
Expired: Apr 11, 2012, 6:45 PM MDT
In force: 97 min
Issued by: the Storm Prediction Center

Counties Baca County, CO, Cimarron County, OK, Armstrong County, TX, Carson County, TX, Dallam County, TX, Gray County, TX, Hansford County, TX, Hartley County, TX, Hutchinson County, TX, Moore County, TX, Oldham County, TX, Potter County, TX, Randall County, TX, Roberts County, TX, Sherman County, TX

The radar

The Amarillo radar (KAMA), 154 km from the middle of the area, began a volume at 23:09 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 nearest sounding before it

Amarillo Airport, TX (KAMA), launched 12:00Z, 11.1 hours before the alert went out and 155 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: 676 J/kg
Mixed-layer CIN: -107 J/kg
Mixed-layer LCL: 1126 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 91 m²/s²
0-3 km storm-relative helicity: 135 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.6

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 11, 1:05 PM MDT	Mesoscale Discussion	SPC	Alamosa, Conejos, Costilla, Custer, Fremont, Huerfano and 3 more	115 min
Apr 11, 2:05 PM MDT	Mesoscale Discussion	SPC	Las Animas	25 min
Apr 11, 2:11 PM MDT	Tornado Watch	SPC	Baca, Bent, Las Animas, Otero, Prowers	7 hr
Apr 11, 1:53 PM MDT	Mesoscale Discussion	SPC	Brewster, Crane, Culberson, El Paso, Hudspeth, Jeff Davis and 7 more	97 min
Apr 11, 2:43 PM MDT	Severe Thunderstorm Watch	SPC	Andrews, Bailey, Brewster, Castro, Cochran, Crane and 19 more	6 hr
Apr 11, 5:21 PM MDT	Mesoscale Discussion	SPC	Andrews, Bailey, Cochran, Crane, Deaf Smith, Ector and 15 more	84 min

Nearby

Mesoscale Discussions in Texas, 2012 Mesoscale Discussions in Colorado, 2012 Mesoscale Discussions in Oklahoma, 2012 Every mesoscale discussion in 2012

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.