Alert archive / Texas / Mesoscale Discussions in 2003

Mesoscale Discussion 512

April 20, 200317 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 20, 2003, 2:36 AM CDT for 17 counties in Texas. It was in force for 114 min.

The area

The outline as issued.

The facts

Issued
Apr 20, 2003, 2:36 AM CDT (07:36 UTC)
Expired
Apr 20, 2003, 4:30 AM CDT
In force
114 min
Issued by
the Storm Prediction Center

Counties Atascosa County, TX, Bandera County, TX, Bee County, TX, Bexar County, TX, Dimmit County, TX, Frio County, TX, Guadalupe County, TX, Karnes County, TX, Kinney County, TX, La Salle County, TX, Live Oak County, TX, Maverick County, TX, McMullen County, TX, Medina County, TX, Uvalde County, TX, Wilson County, TX, Zavala County, TX

The nearest sounding before it

Del Rio, TX (KDRT), launched 00:00Z, 7.6 hours before the alert went out and 168 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, Del Rio, TX at 00:00Z on 2003-04-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1268 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, Del Rio, TX at 00:00Z on 2003-04-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -78 square meters per square second.1939587897Sfc1 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
1268 J/kg
Mixed-layer CIN
-49 J/kg
Mixed-layer LCL
1819 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
-78 m²/s²
0-3 km storm-relative helicity
75 m²/s²
Significant tornado parameter
-0.1
Supercell composite
-2.9

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, 9:20 AM CDTMesoscale DiscussionSPCHidalgo, Jim Hogg, Starr, Zapata2 hr
Apr 20, 11:52 AM CDTMesoscale DiscussionSPCAngelina, Aransas, Austin, Bee, Brooks, Calhoun and 30 more2 hr

Nearby

Mesoscale Discussions in Texas, 2003Every mesoscale discussion in 2003

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.