Alert archive / Texas / Mesoscale Discussions in 2016

Mesoscale Discussion 654

May 19, 20164 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 19, 2016, 3:47 PM CDT for 4 counties in Texas. It was in force for 88 min.

The area

The outline as issued.

The facts

Issued: May 19, 2016, 3:47 PM CDT (20:47 UTC)
Expired: May 19, 2016, 5:15 PM CDT
In force: 88 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

Counties Cameron County, TX, Hidalgo County, TX, Kenedy County, TX, Willacy County, TX

The radar

The Brownsville radar (KBRO), 64 km from the middle of the area, began a volume at 20:50 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

Brownsville Intl, TX (KBRO), launched 12:00Z, 8.8 hours before the alert went out and 67 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: 1243 J/kg
Mixed-layer CIN: -55 J/kg
Mixed-layer LCL: 798 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 127 m²/s²
0-3 km storm-relative helicity: 184 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 4.5

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
May 19, 7:04 AM CDT	Mesoscale Discussion	SPC	Aransas, Atascosa, Bee, DeWitt, Dimmit, Frio and 10 more	116 min
May 19, 7:56 AM CDT	Severe Thunderstorm Watch	SPC	Aransas, Atascosa, Bee, Calhoun, DeWitt, Duval and 14 more	7 hr
May 19, 10:13 AM CDT	Mesoscale Discussion	SPC	Aransas, Bee, Calhoun, Goliad, Jackson, Jim Wells and 6 more	92 min
May 19, 11:35 AM CDT	Mesoscale Discussion	SPC	Aransas, Brazoria, Calhoun, Fort Bend, Galveston, Jackson and 4 more	85 min

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.