Alert archive / Texas / Mesoscale Discussions in 2013

Mesoscale Discussion 289

March 20, 201319 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Mar 20, 2013, 1:41 AM CDT for 19 counties in Texas. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued: Mar 20, 2013, 1:41 AM CDT (06:41 UTC)
Expired: Mar 20, 2013, 3:15 AM CDT
In force: 94 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

Counties Austin County, TX, Bastrop County, TX, Blanco County, TX, Brazoria County, TX, Burleson County, TX, Burnet County, TX, Caldwell County, TX, Colorado County, TX, Fayette County, TX, Fort Bend County, TX, Harris County, TX, Hays County, TX, Lee County, TX, Llano County, TX, Milam County, TX, Travis County, TX, Waller County, TX, Washington County, TX, Williamson County, TX

The radar

The Ft Hood radar (KGRK), 63 km from the middle of the area, began a volume at 06:42 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

Corpus Christi, TX (KCRP), launched 00:00Z, 6.7 hours before the alert went out and 270 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: 268 J/kg
Mixed-layer CIN: -399 J/kg
Mixed-layer LCL: 943 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: 77 m²/s²
0-3 km storm-relative helicity: 207 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

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
Mar 19, 7:59 PM CDT	Mesoscale Discussion	SPC	Bastrop, Bell, Blanco, Brazos, Brown, Burleson and 18 more	91 min
Mar 19, 10:24 PM CDT	Mesoscale Discussion	SPC	Bastrop, Bell, Blanco, Bosque, Brazos, Burleson and 28 more	66 min

Nearby

Mesoscale Discussions in Texas, 2013 Every mesoscale discussion in 2013

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.