Alert archive / Texas / Mesoscale Discussions in 2011

Mesoscale Discussion 555

April 24, 201110 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 24, 2011, 5:22 PM CDT for 10 counties in Texas. It was in force for 83 min.

The area

The outline as issued.

The facts

Issued: Apr 24, 2011, 5:22 PM CDT (22:22 UTC)
Expired: Apr 24, 2011, 6:45 PM CDT
In force: 83 min
Issued by: the Storm Prediction Center

Counties Crockett County, TX, Edwards County, TX, Irion County, TX, Kinney County, TX, Maverick County, TX, Menard County, TX, Schleicher County, TX, Sutton County, TX, Terrell County, TX, Val Verde County, TX

The radar

The Laughlin AFB radar (KDFX), 78 km from the middle of the area, began a volume at 22:23 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

Midland Regional, TX (KMAF), launched 12:00Z, 10.4 hours before the alert went out and 279 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: 1567 J/kg
Mixed-layer CIN: -150 J/kg
Mixed-layer LCL: 706 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 289 m²/s²
0-3 km storm-relative helicity: 277 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 9.6

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 23, 7:04 PM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Brown, Callahan, Clay, Coleman and 31 more	86 min
Apr 23, 9:53 PM CDT	Severe Thunderstorm Watch	SPC	Archer, Clay, Cooke, Fannin, Grayson, Lamar and 2 more	7 hr
Apr 24, 1:13 PM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Brown, Callahan, Clay, Coke and 37 more	92 min
Apr 24, 2:19 PM CDT	Severe Thunderstorm Watch	SPC	Brown, Callahan, Coke, Coleman, Comanche, Concho and 17 more	3 hr
Apr 24, 2:28 PM CDT	Severe Thunderstorm Watch	SPC	Clay	7 hr
Apr 24, 4:51 PM CDT	Mesoscale Discussion	SPC	Brown, Callahan, Coke, Coleman, Comanche, Concho and 19 more	24 min
Apr 24, 4:54 PM CDT	Tornado Watch	SPC	Brown, Callahan, Coke, Coleman, Collin, Comanche and 33 more	7 hr

Nearby

Mesoscale Discussions in Texas, 2011 Every mesoscale discussion in 2011

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.