Alert archive / Texas / Mesoscale Discussions in 2014

Mesoscale Discussion 377

April 21, 201421 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 21, 2014, 5:09 PM CDT for 21 counties in Texas. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued
Apr 21, 2014, 5:09 PM CDT (22:09 UTC)
Expired
Apr 21, 2014, 6:45 PM CDT
In force
96 min
Issued by
the Storm Prediction Center
All 21 counties

Bandera County, TX, Bell County, TX, Blanco County, TX, Burnet County, TX, Comal County, TX, Coryell County, TX, Ellis County, TX, Gillespie County, TX, Hays County, TX, Hill County, TX, Kendall County, TX, Kerr County, TX, Kimble County, TX, Lampasas County, TX, Llano County, TX, Mason County, TX, McLennan County, TX, Navarro County, TX, Sutton County, TX, Travis County, TX, Williamson County, TX

The radar

The Ft Hood radar (KGRK), 111 km from the middle of the area, began a volume at 22:13 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

Fort Worth, TX (KFWD), launched 12:00Z, 10.2 hours before the alert went out and 229 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-pSkew-T log-p diagram, Fort Worth, TX at 12:00Z on 2014-04-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 113 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Fort Worth, TX at 12:00Z on 2014-04-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 206 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
113 J/kg
Mixed-layer CIN
-117 J/kg
Mixed-layer LCL
648 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
206 m²/s²
0-3 km storm-relative helicity
201 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.2

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.

IssuedProductOfficeCountiesLasted
Apr 20, 10:18 PM CDTMesoscale DiscussionSPCArcher, Baylor, Clay, Haskell, Knox, Stonewall and 4 more87 min
Apr 21, 2:25 PM CDTMesoscale DiscussionSPCBell, Bosque, Brown, Coleman, Collin, Comanche and 30 more2 hr
Apr 21, 2:52 PM CDTSevere Thunderstorm WatchSPCAnderson, Bell, Blanco, Bosque, Burnet, Camp and 55 more7 hr

Nearby

Mesoscale Discussions in Texas, 2014Every 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.