Alert archive / Texas / Mesoscale Discussions in 2005

Mesoscale Discussion 841

May 12, 20054 counties in Oklahoma; 24 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 12, 2005, 2:22 PM CDT for 4 counties in Oklahoma; 24 counties in Texas. It was in force for 53 min.

The area

The outline as issued.

The facts

Issued: May 12, 2005, 2:22 PM CDT (19:22 UTC)
Expired: May 12, 2005, 3:15 PM CDT
In force: 53 min
Issued by: the Storm Prediction Center

All 28 counties

Beaver County, OK, Ellis County, OK, Harper County, OK, Woodward County, OK, Armstrong County, TX, Bailey County, TX, Briscoe County, TX, Carson County, TX, Castro County, TX, Cochran County, TX, Donley County, TX, Floyd County, TX, Gray County, TX, Hale County, TX, Hansford County, TX, Hemphill County, TX, Hockley County, TX, Hutchinson County, TX, Lamb County, TX, Lipscomb County, TX, Lubbock County, TX, Ochiltree County, TX, Parmer County, TX, Potter County, TX, Randall County, TX, Roberts County, TX, Swisher County, TX, Wheeler County, TX

The radar

The Amarillo radar (KAMA), 59 km from the middle of the area, began a volume at 19:22 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.

The nearest sounding before it

Amarillo Airport, TX (KAMA), launched 12:00Z, 7.4 hours before the alert went out and 58 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: 1261 J/kg
Mixed-layer CIN: -43 J/kg
Mixed-layer LCL: 580 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: -9 m²/s²
0-3 km storm-relative helicity: 160 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

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 11, 9:34 PM CDT	Mesoscale Discussion	SPC	Beaver, Beckham, Ellis, Greer, Harmon, Harper and 3 more	26 min
May 12, 9:34 AM CDT	Mesoscale Discussion	SPC	Beaver, Ellis	116 min
May 12, 11:30 AM CDT	Severe Thunderstorm Watch	SPC	Beaver, Ellis, Harper, Woodward	8 hr
May 12, 2:55 PM CDT	Tornado Watch	SPC	Beckham, Greer, Harmon, Jackson	6 hr
May 12, 5:18 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Blaine, Dewey, Garfield, Grant, Kay and 5 more	57 min
May 12, 5:55 PM CDT	Severe Thunderstorm Watch	SPC	Alfalfa, Beckham, Blaine, Custer, Dewey, Ellis and 10 more	7 hr
May 12, 6:07 PM CDT	Mesoscale Discussion	SPC	Beckham, Greer, Harmon, Jackson	53 min
May 11, 8:31 PM CDT	Mesoscale Discussion	SPC	Andrews, Armstrong, Borden, Briscoe, Carson, Crane and 22 more	89 min
May 12, 4:08 PM CDT	Mesoscale Discussion	SPC	Andrews, Borden, Crane, Dawson, Ector, Gaines and 11 more	2 hr

Nearby

Mesoscale Discussions in Texas, 2005 Mesoscale Discussions in Oklahoma, 2005 Every mesoscale discussion in 2005

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.