Alert archive / Texas / Mesoscale Discussions in 2006

Mesoscale Discussion 577

April 20, 20067 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 20, 2006, 4:55 AM CDT for 7 counties in Texas. It was in force for 65 min.

The area

The outline as issued.

The facts

Issued: Apr 20, 2006, 4:55 AM CDT (09:55 UTC)
Expired: Apr 20, 2006, 6:00 AM CDT
In force: 65 min
Issued by: the Storm Prediction Center

Counties Dimmit County, TX, Edwards County, TX, Kinney County, TX, Maverick County, TX, Real County, TX, Uvalde County, TX, Zavala County, TX

The radar

The Laughlin AFB radar (KDFX), 16 km from the middle of the area, began a volume at 09:57 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

Del Rio, TX (KDRT), launched 00:00Z, 9.9 hours before the alert went out and 54 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: 1439 J/kg
Mixed-layer CIN: -177 J/kg
Mixed-layer LCL: 2182 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: -13 m²/s²
0-3 km storm-relative helicity: -8 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

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 19, 7:31 PM CDT	Mesoscale Discussion	SPC	Dimmit, Frio, La Salle, Webb, Zavala	119 min
Apr 19, 7:41 PM CDT	Mesoscale Discussion	SPC	Angelina, Camp, Cass, Cherokee, Gregg, Harrison and 11 more	94 min
Apr 19, 8:30 PM CDT	Mesoscale Discussion	SPC	Borden, Bosque, Brown, Callahan, Coke, Coleman and 37 more	60 min
Apr 19, 8:55 PM CDT	Severe Thunderstorm Watch	SPC	Archer, Bosque, Brown, Callahan, Clay, Coke and 33 more	6 hr
Apr 19, 9:23 PM CDT	Severe Thunderstorm Watch	SPC	Anderson, Bell, Bowie, Camp, Cass, Cherokee and 35 more	5 hr
Apr 20, 1:49 AM CDT	Severe Thunderstorm Watch	SPC	Anderson, Bell, Bowie, Camp, Cass, Cherokee and 35 more	7 hr
Apr 20, 2:43 AM CDT	Mesoscale Discussion	SPC	Borden, Callahan, Dawson, Eastland, Fisher, Glasscock and 11 more	62 min
Apr 20, 2:53 AM CDT	Severe Thunderstorm Watch	SPC	Dimmit, Edwards, Kinney, Maverick, Real, Uvalde and 2 more	3 hr
Apr 20, 3:13 AM CDT	Severe Thunderstorm Watch	SPC	Andrews, Borden, Brown, Callahan, Coke, Coleman and 26 more	8 hr
Apr 20, 9:30 AM CDT	Severe Thunderstorm Watch	SPC	Bandera, Brown, Coke, Coleman, Concho, Crockett and 24 more	7 hr
Apr 20, 10:15 AM CDT	Mesoscale Discussion	SPC	Borden, Callahan, Coke, Coleman, Concho, Crane and 26 more	60 min
Apr 20, 11:18 AM CDT	Severe Thunderstorm Watch	SPC	Bastrop, Bexar, Blanco, Burnet, Caldwell, Comal and 9 more	4 hr
Apr 20, 1:21 PM CDT	Mesoscale Discussion	SPC	Anderson, Bell, Blanco, Borden, Bosque, Brown and 79 more	84 min
Apr 20, 2:58 PM CDT	Mesoscale Discussion	SPC	Bandera, Blanco, Burnet, Comal, Crockett, Edwards and 16 more	62 min
Apr 20, 3:24 PM CDT	Tornado Watch	SPC	Bandera, Bastrop, Bexar, Blanco, Brazos, Burleson and 34 more	7 hr
Apr 20, 3:31 PM CDT	Severe Thunderstorm Watch	SPC	Bell, Bosque, Brown, Callahan, Coke, Coleman and 20 more	6 hr
Apr 20, 3:54 PM CDT	Mesoscale Discussion	SPC	Loving, Ward, Winkler	66 min
Apr 20, 4:37 PM CDT	Tornado Watch	SPC	Andrews, Crane, Dawson, Ector, Gaines, Glasscock and 10 more	4 hr
Apr 20, 5:54 PM CDT	Mesoscale Discussion	SPC	Austin, Bastrop, Brazos, Burleson, Caldwell, Colorado and 11 more	96 min
Apr 20, 6:34 PM CDT	Severe Thunderstorm Watch	SPC	Anderson, Angelina, Cherokee, Ellis, Gregg, Grimes and 29 more	6 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.