Alert archive / Texas / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 145, NWS Austin/San Antonio, TX

July 1, 1987Travis County, Williamson County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Jul 1, 1987, 3:08 PM CDT for Travis County, Williamson County, Texas. It was in force for 67 min.

The area

The counties it named.

The facts

Issued
Jul 1, 1987, 3:08 PM CDT (20:08 UTC)
Expired
Jul 1, 1987, 4:15 PM CDT
In force
67 min
Issued by
NWS Austin/San Antonio, TX
Area
Whole counties

Counties Travis County, TX, Williamson 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

Victoria Regiona, TX (KVCT), launched 12:00Z, 8.1 hours before the alert went out and 198 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, Victoria Regiona, TX at 12:00Z on 1987-07-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1951 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, Victoria Regiona, TX at 12:00Z on 1987-07-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -23 square meters per square second.19395878Sfc1 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
1951 J/kg
Mixed-layer CIN
-30 J/kg
Mixed-layer LCL
807 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
-23 m²/s²
0-3 km storm-relative helicity
-6 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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.

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, Jul 1, 2:28 PM CDT, 40 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN TX
230 PM CDT WED JUL  1 1987

...STRONG THUNDERSTORMS FORMING NORTHEAST OF AUSTIN...

WEATHER RADAR SHOWS STRONG THUNDERSTORMS DEVELOPING NORTHEAST OF
AUSTIN FROM HUTTO TO THORNDALE TO ROCKDALE. THE MOST INTENSE
THUNDERSTORM IS BETWEEN THRALL AND THORNDALE ALONG THE WILLIAMSON-
MILAM COUNTY LINE. LITTLE MOVEMENT IS INDICATED.

THESE INDIVIDUAL STORMS COULD PRODUCE LOCALIZED VERY HEAVY RAIN
AND POSSIBLE HAIL.

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 1, 6:08 PM CDTSevere Thunderstorm WarningEWXBlanco67 min
Jul 1, 6:37 PM CDTSevere Thunderstorm WarningEWXComal68 min

Nearby

Severe Thunderstorm Warnings in Texas, 1987Every severe thunderstorm warning 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.