Alert archive / Texas / Mesoscale Discussions in 2016

Mesoscale Discussion 377

April 13, 20169 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 13, 2016, 2:01 AM CDT for 9 counties in Texas. It was in force for 119 min.

The area

The outline as issued.

The facts

Issued: Apr 13, 2016, 2:01 AM CDT (07:01 UTC)
Expired: Apr 13, 2016, 4:00 AM CDT
In force: 119 min
Issued by: the Storm Prediction Center

Counties Brazoria County, TX, Chambers County, TX, Fort Bend County, TX, Galveston County, TX, Harris County, TX, Jackson County, TX, Jefferson County, TX, Matagorda County, TX, Wharton County, TX

The radar

The Houston radar (KHGX), 33 km from the middle of the area, began a volume at 07:00 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, 7.0 hours before the alert went out and 228 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: 197 J/kg
Mixed-layer CIN: -157 J/kg
Mixed-layer LCL: 689 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: 108 m²/s²
0-3 km storm-relative helicity: 104 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.6

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 12, 7:26 PM CDT	Mesoscale Discussion	SPC	Atascosa, Bandera, Bastrop, Bexar, Caldwell, Comal and 17 more	3 hr
Apr 12, 7:45 PM CDT	Severe Thunderstorm Watch	SPC	Atascosa, Bandera, Bee, Bexar, Blanco, Caldwell and 26 more	5 hr
Apr 12, 9:43 PM CDT	Mesoscale Discussion	SPC	Atascosa, Bandera, Bee, Bexar, Blanco, Caldwell and 25 more	92 min
Apr 12, 11:06 PM CDT	Mesoscale Discussion	SPC	Austin, Brazoria, Colorado, DeWitt, Fayette, Fort Bend and 7 more	114 min
Apr 12, 11:26 PM CDT	Severe Thunderstorm Watch	SPC	Austin, Brazoria, Chambers, Colorado, Fort Bend, Galveston and 5 more	6 hr

Nearby

Mesoscale Discussions in Texas, 2016 Every mesoscale discussion in 2016

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.