Alert archive / Texas / Mesoscale Discussions in 2014

Mesoscale Discussion 184

March 15, 201422 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Mar 15, 2014, 3:40 PM CDT for 22 counties in Texas. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Mar 15, 2014, 3:40 PM CDT (20:40 UTC)
Expired: Mar 15, 2014, 6:15 PM CDT
In force: 3 hr
Issued by: the Storm Prediction Center
Chance of a watch: 40%

All 22 counties

Anderson County, TX, Camp County, TX, Cherokee County, TX, Falls County, TX, Freestone County, TX, Gregg County, TX, Grimes County, TX, Henderson County, TX, Houston County, TX, Leon County, TX, Limestone County, TX, Madison County, TX, Navarro County, TX, Polk County, TX, Robertson County, TX, Rusk County, TX, Smith County, TX, Trinity County, TX, Upshur County, TX, Van Zandt County, TX, Walker County, TX, Wood County, TX

The radar

The Shreveport radar (KSHV), 184 km from the middle of the area, began a volume at 20:39 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

Fort Worth, TX (KFWD), launched 12:00Z, 8.7 hours before the alert went out and 209 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: 223 J/kg
Mixed-layer CIN: -147 J/kg
Mixed-layer LCL: 569 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 47 m²/s²
0-3 km storm-relative helicity: -24 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
Mar 15, 1:13 PM CDT	Mesoscale Discussion	SPC	Archer, Bosque, Brown, Callahan, Clay, Coleman and 37 more	2 hr
Mar 15, 2:17 PM CDT	Severe Thunderstorm Watch	SPC	Archer, Bosque, Brown, Callahan, Clay, Coleman and 33 more	7 hr
Mar 15, 5:28 PM CDT	Mesoscale Discussion	SPC	Bell, Bosque, Brown, Burnet, Comanche, Coryell and 22 more	92 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.