Alert archive / Texas / Mesoscale Discussions in 2013

Mesoscale Discussion 377

April 2, 20135 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 2, 2013, 10:06 PM CDT for 5 counties in Texas. It was in force for 54 min.

The area

The outline as issued.

The facts

Issued: Apr 2, 2013, 10:06 PM CDT (03:06 UTC)
Expired: Apr 2, 2013, 11:00 PM CDT
In force: 54 min
Issued by: the Storm Prediction Center

Counties Brazoria County, TX, Chambers County, TX, Fort Bend County, TX, Galveston County, TX, Harris County, TX

The radar

The Houston radar (KHGX), 28 km from the middle of the area, began a volume at 03:06 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 nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 00:00Z, 3.1 hours before the alert went out and 210 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1267 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 123 m²/s²
0-3 km storm-relative helicity: 241 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.4

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
Apr 2, 7:35 PM CDT	Mesoscale Discussion	SPC	Atascosa, Bandera, Bastrop, Bell, Bexar, Blanco and 43 more	85 min
Apr 2, 8:15 PM CDT	Mesoscale Discussion	SPC	Austin, Brazoria, Brazos, Burleson, Chambers, Colorado and 13 more	60 min
Apr 2, 10:26 PM CDT	Mesoscale Discussion	SPC	Atascosa, Bexar, Blanco, Comal, Dimmit, Duval and 11 more	64 min
Apr 2, 10:47 PM CDT	Severe Thunderstorm Watch	SPC	Atascosa, Bee, Dimmit, Duval, Frio, Jim Wells and 4 more	5 hr
Apr 3, 1:10 AM CDT	Mesoscale Discussion	SPC	Jasper, Newton, Orange	3 hr
Apr 3, 1:36 AM CDT	Mesoscale Discussion	SPC	Aransas, Austin, Bee, Brazoria, Calhoun, Chambers and 13 more	114 min
Apr 3, 7:59 AM CDT	Mesoscale Discussion	SPC	Atascosa, Bandera, Bexar, Blanco, Comal, Dimmit and 20 more	91 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.