Alert archive / Texas / Mesoscale Discussions in 2014

Mesoscale Discussion 1937

November 22, 201419 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Nov 22, 2014, 9:51 PM CST for 19 counties in Texas. It was in force for 54 min.

The area

The outline as issued.

The facts

Issued: Nov 22, 2014, 9:51 PM CST (03:51 UTC)
Expired: Nov 22, 2014, 10:45 PM CST
In force: 54 min
Issued by: the Storm Prediction Center

Counties Austin County, TX, Brazoria County, TX, Burleson County, TX, Chambers County, TX, Colorado County, TX, Fayette County, TX, Fort Bend County, TX, Galveston County, TX, Grimes County, TX, Harris County, TX, Jefferson County, TX, Lavaca County, TX, Lee County, TX, Liberty County, TX, Matagorda County, TX, Montgomery County, TX, Waller County, TX, Washington County, TX, Wharton County, TX

The radar

The Houston radar (KHGX), 110 km from the middle of the area, began a volume at 03:52 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, 3.9 hours before the alert went out and 196 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: 1796 J/kg
Mixed-layer CIN: -15 J/kg
Mixed-layer LCL: 735 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 191 m²/s²
0-3 km storm-relative helicity: 137 m²/s²
Significant tornado parameter: 1.3
Supercell composite: 6.8

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
Nov 22, 7:35 PM CST	Mesoscale Discussion	SPC	Aransas, Bee, Bexar, Brazoria, Caldwell, Calhoun and 18 more	85 min
Nov 22, 11:47 PM CST	Mesoscale Discussion	SPC	Chambers, Galveston, Jefferson	118 min

Nearby

Mesoscale Discussions in Texas, 2014 Every mesoscale discussion in 2014

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.