Alert archive / Texas / Mesoscale Discussions in 2018

Mesoscale Discussion 186

March 28, 20185 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Mar 28, 2018, 9:09 AM CDT for 5 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Mar 28, 2018, 9:09 AM CDT (14:09 UTC)
Expired: Mar 28, 2018, 11:15 AM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 20%

Counties Atascosa County, TX, Bexar County, TX, Frio County, TX, Medina County, TX, Wilson County, TX

The radar

The Austin/San Antonio radar (KEWX), 98 km from the middle of the area, began a volume at 14:13 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 (KDLF), launched 12:00Z, 2.2 hours before the alert went out and 199 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: 307 J/kg
Mixed-layer CIN: -54 J/kg
Mixed-layer LCL: 577 m above ground
0-6 km bulk shear: 66 kt
0-1 km storm-relative helicity: 138 m²/s²
0-3 km storm-relative helicity: 125 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 2.3

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
Mar 27, 9:23 PM CDT	Mesoscale Discussion	SPC	Atascosa, Bandera, Bexar, Blanco, Caldwell, Comal and 20 more	97 min
Mar 27, 9:51 PM CDT	Severe Thunderstorm Watch	SPC	Atascosa, Bastrop, Bexar, Caldwell, DeWitt, Dimmit and 15 more	5 hr
Mar 27, 11:58 PM CDT	Mesoscale Discussion	SPC	Atascosa, Bastrop, Bexar, Caldwell, Comal, DeWitt and 17 more	2 hr
Mar 28, 5:05 AM CDT	Mesoscale Discussion	SPC	Bastrop, Brazos, Burleson, Fayette, Grimes, Lee and 1 more	85 min
Mar 28, 11:38 AM CDT	Mesoscale Discussion	SPC	Austin, Colorado, Fort Bend, Hardin, Harris, Jasper and 10 more	67 min
Mar 28, 12:03 PM CDT	Tornado Watch	SPC	Angelina, Austin, Brazoria, Chambers, Colorado, Fort Bend and 24 more	9 hr
Mar 28, 3:07 PM CDT	Mesoscale Discussion	SPC	Austin, Chambers, Fort Bend, Hardin, Harris, Jasper and 9 more	113 min
Mar 28, 5:48 PM CDT	Mesoscale Discussion	SPC	Austin, Brazoria, Chambers, Colorado, Fort Bend, Hardin and 10 more	87 min
Mar 28, 6:53 PM CDT	Mesoscale Discussion	SPC	Brooks, Cameron, Duval, Hidalgo, Jim Hogg, Jim Wells and 6 more	97 min

Nearby

Mesoscale Discussions in Texas, 2018 Every mesoscale discussion in 2018

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.