Alert archive / Texas / Mesoscale Discussions in 2006

Mesoscale Discussion 811

May 9, 200617 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 9, 2006, 4:08 PM CDT for 17 counties in Texas. It was in force for 97 min.

The area

The outline as issued.

The facts

Issued: May 9, 2006, 4:08 PM CDT (21:08 UTC)
Expired: May 9, 2006, 5:45 PM CDT
In force: 97 min
Issued by: the Storm Prediction Center

Counties Bandera County, TX, Blanco County, TX, Burnet County, TX, Comal County, TX, Edwards County, TX, Gillespie County, TX, Hays County, TX, Kendall County, TX, Kerr County, TX, Kimble County, TX, Lampasas County, TX, Llano County, TX, Mason County, TX, McCulloch County, TX, Real County, TX, San Saba County, TX, Uvalde County, TX

The radar

The Austin/San Antonio radar (KEWX), 112 km from the middle of the area, began a volume at 21:06 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 322May 9, 6:30 PM CDT

The nearest sounding before it

Del Rio, TX (KDRT), launched 12:00Z, 9.1 hours before the alert went out and 218 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: 2733 J/kg
Mixed-layer CIN: -195 J/kg
Mixed-layer LCL: 1156 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 143 m²/s²
0-3 km storm-relative helicity: 199 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.4

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 8, 7:42 PM CDT	Mesoscale Discussion	SPC	Newton	93 min
May 9, 3:45 PM CDT	Mesoscale Discussion	SPC	Collin, Cooke, Delta, Denton, Fannin, Franklin and 5 more	2 hr
May 9, 4:56 PM CDT	Mesoscale Discussion	SPC	Armstrong, Briscoe, Carson, Collingsworth, Deaf Smith, Donley and 15 more	2 hr
May 9, 6:01 PM CDT	Severe Thunderstorm Watch	SPC	Armstrong, Baylor, Briscoe, Carson, Childress, Collingsworth and 20 more	7 hr
May 9, 6:30 PM CDT	Mesoscale Discussion	SPC	Lamar	90 min
May 9, 6:30 PM CDT	Severe Thunderstorm Watch	SPC	Atascosa, Bandera, Bell, Bexar, Blanco, Burnet and 27 more	4 hr

Nearby

Mesoscale Discussions in Texas, 2006 Every mesoscale discussion in 2006

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.