Alert archive / Texas / Mesoscale Discussions in 2005

Mesoscale Discussion 827

May 11, 20059 counties in Oklahoma; 24 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 11, 2005, 6:24 PM CDT for 9 counties in Oklahoma; 24 counties in Texas. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued: May 11, 2005, 6:24 PM CDT (23:24 UTC)
Expired: May 11, 2005, 8:00 PM CDT
In force: 96 min
Issued by: the Storm Prediction Center

All 33 counties

Beaver County, OK, Beckham County, OK, Ellis County, OK, Greer County, OK, Harmon County, OK, Harper County, OK, Jackson County, OK, Roger Mills County, OK, Texas County, OK, Armstrong County, TX, Briscoe County, TX, Carson County, TX, Childress County, TX, Collingsworth County, TX, Cottle County, TX, Crosby County, TX, Dickens County, TX, Donley County, TX, Floyd County, TX, Foard County, TX, Gray County, TX, Hall County, TX, Hansford County, TX, Hardeman County, TX, Hemphill County, TX, Hutchinson County, TX, King County, TX, Knox County, TX, Lipscomb County, TX, Motley County, TX, Ochiltree County, TX, Roberts County, TX, Wheeler County, TX

The radar

The Amarillo radar (KAMA), 92 km from the middle of the area, began a volume at 23:26 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, 11.4 hours before the alert went out and 91 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: 1231 J/kg
Mixed-layer CIN: -227 J/kg
Mixed-layer LCL: 1143 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 156 m²/s²
0-3 km storm-relative helicity: 99 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.0

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
May 10, 9:39 PM CDT	Mesoscale Discussion	SPC	Beaver, Ellis, Harper, Roger Mills, Woods, Woodward	36 min
May 11, 2:25 PM CDT	Mesoscale Discussion	SPC	Beaver, Beckham, Ellis, Harmon, Harper, Roger Mills and 1 more	2 hr
May 11, 3:25 PM CDT	Tornado Watch	SPC	Beaver, Beckham, Ellis, Greer, Harmon, Harper and 3 more	7 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.