Alert archive / Texas / Tornado Warnings in 1987

Tornado Warning 9, NWS Austin/San Antonio, TX

May 20, 1987Uvalde County, Zavala County, Texas

NWS Austin/San Antonio, TX issued this tornado warning at May 20, 1987, 9:00 PM CDT for Uvalde County, Zavala County, Texas. It was in force for 60 min.

The area

The counties it named.

The facts

Issued
May 20, 1987, 9:00 PM CDT (02:00 UTC)
Expired
May 20, 1987, 10:00 PM CDT
In force
60 min
Issued by
NWS Austin/San Antonio, TX
Area
Whole counties

Counties Uvalde County, TX, Zavala County, TX

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Del Rio, TX (KDRT), launched 00:00Z, 2.0 hours before the alert went out and 109 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 1987-05-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2341 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 1987-05-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 81 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
2341 J/kg
Mixed-layer CIN
-40 J/kg
Mixed-layer LCL
1554 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
81 m²/s²
0-3 km storm-relative helicity
137 m²/s²
Significant tornado parameter
0.4
Supercell composite
5.6

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

The office that day

Everything else NWS Austin/San Antonio, TX issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 20, 7:11 PM CDTSevere Thunderstorm WarningEWXWilson64 min
May 20, 7:38 PM CDTSevere Thunderstorm WarningEWXAtascosa, Frio67 min
May 20, 7:42 PM CDTSevere Thunderstorm WarningEWXComal63 min
May 20, 8:34 PM CDTSevere Thunderstorm WarningEWXBlanco, Hays56 min
May 20, 8:50 PM CDTSevere Thunderstorm WarningEWXVal Verde56 min
May 20, 8:56 PM CDTSevere Thunderstorm WarningEWXMaverick64 min
May 20, 9:03 PM CDTSevere Thunderstorm WarningEWXAtascosa, Frio57 min
May 20, 9:27 PM CDTSevere Thunderstorm WarningEWXTravis63 min
May 20, 9:27 PM CDTTornado WarningEWXVal Verde58 min
May 20, 9:47 PM CDTSevere Thunderstorm WarningEWXKinney58 min
May 20, 10:20 PM CDTSevere Thunderstorm WarningEWXVal Verde60 min
May 20, 10:37 PM CDTSevere Thunderstorm WarningEWXEdwards68 min
May 20, 10:42 PM CDTSevere Thunderstorm WarningEWXMedina, Uvalde, Zavala63 min
May 20, 11:47 PM CDTSevere Thunderstorm WarningEWXMedina, Uvalde, Zavala58 min
May 21, 1:00 AM CDTSevere Thunderstorm WarningEWXUvalde60 min
May 21, 6:17 AM CDTFlash Flood WarningEWXBexar3 hr
May 21, 6:23 PM CDTSevere Thunderstorm WarningEWXLlano67 min

Nearby

Tornado Warnings in Texas, 1987Every tornado warning in 1987Tornadoes in 1987

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.