Alert archive / Texas / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 180, NWS Austin/San Antonio, TX

November 25, 1987Williamson County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Nov 25, 1987, 12:42 AM CST for Williamson County, Texas. It was in force for 63 min.

The area

The counties it named.

The facts

Issued
Nov 25, 1987, 12:42 AM CST (06:42 UTC)
Expired
Nov 25, 1987, 1:45 AM CST
In force
63 min
Issued by
NWS Austin/San Antonio, TX
Area
Whole counties

County 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 00:00Z, 6.7 hours before the alert went out and 211 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 00:00Z on 1987-11-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1109 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 00:00Z on 1987-11-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 74 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
1109 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
693 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
74 m²/s²
0-3 km storm-relative helicity
153 m²/s²
Significant tornado parameter
0.4
Supercell composite
3.6

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.

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, Nov 24, 9:54 PM CST, 2 hours 48 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SAN ANTONIO TX
950 PM CST TUE NOV 24 1987

...SHOWERS AND THUNDERSHOWERS CONTINUE SOUTH CENTRAL TEXAS...

AT 935 PM CST...THE HONDO WEATHER RADAR INDICATED SCATTERED SHOWERS
AND THUNDERSHOWERS FROM THE SAN ANTONIO AREA...TO SEGUIN...TO JUST
SOUTHWEST OF AUSTIN. THE STRONGEST THUNDERSHOWERS WERE NEAR NEW
BRAUNFELS AND EAST OF BLANCO. MOVEMENT WAS TO THE NORTH NORTHEAST
AT 15 MPH.

VERY MOIST AIR...AND A WEAK UPPER LEVEL DISTURBANCE ARE COMBINING TO
PRODUCE THE THUNDERSHOWERS THIS EVENING. IN ADDITION...A NEARLY STALLED
COLD FRONT WAS IN WEST TEXAS NEAR SAN ANGELO...AND MOVING VERY SLOWLY
TO THE SOUTHEAST. THE WEATHER OFFICE IN SAN ANTONIO HAD RECORDED
ABOUT ONE THIRD OF AN INCH UP TO 930 PM...BUT OTHER AREAS IN NORTHEAST
SAN ANTONIO MAY HAVE RECEIVED HEAVIER AMOUNTS.

THUNDERSHOWERS WILL CONTINUE TO DEVELOP TONIGHT AND THROUGH WEDNESDAY.
MINOR FLOODING OF SOME STREETS AND LOW LY,ING AREAS IS POSSIBLE
LATER TONIGHT AND TOWARD MORNING.

STAY TUNED TO NOAA WEATHER RADIO...OR YOUR LOCAL RADIO OR TV
STATION FOR LATER DEVELOPMENTS.

The office that day

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

IssuedProductOfficeCountiesLasted
Nov 24, 11:41 PM CSTSevere Thunderstorm WarningEWXTravis, Williamson64 min
Nov 25, 2:08 AM CSTFlash Flood WarningEWXHays3 hr

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.