Alert archive / Texas / Flash Flood Warnings in 1986

Flash Flood Warning 46, NWS Austin/San Antonio, TX

August 28, 1986Val Verde County, Texas

NWS Austin/San Antonio, TX issued this flash flood warning at Aug 28, 1986, 8:45 AM CDT for Val Verde County, Texas. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued
Aug 28, 1986, 8:45 AM CDT (13:45 UTC)
Expired
Aug 28, 1986, 1:00 PM CDT
In force
4 hr
Issued by
NWS Austin/San Antonio, TX
Area
Whole counties

County Val Verde 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 12:00Z, 1.8 hours before the alert went out and 66 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 12:00Z on 1986-08-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1721 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 12:00Z on 1986-08-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -25 square meters per square second.1939Sfc1 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
1721 J/kg
Mixed-layer CIN
-25 J/kg
Mixed-layer LCL
746 m above ground
0-6 km bulk shear
6 kt
0-1 km storm-relative helicity
-25 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 flash flood 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, Aug 28, 2:59 AM CDT, 5 hours 46 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN TX
3 AM CDT THU AUG 28 1986

          ...THUNDERSTORMS CONTINUE NORTH OF AUSTIN....

THUNDERSTORM ACTIVITY..SOME HEAVY CONTINUES SOUTH OF SAN SABA..
NEAR LAKE BUCHANAN AND FROM THE NORTHERN PORTIONS OF WILLIAMSON COUNTY
NORTHEASTWARD TO EAST OF WACO. MOVEMENT WAS GENERALLY EASTWARD.

A FEW OF THE HEAVY THUNDESTORMS WILL CAUSE BRIEF HEAVY RAINFALL..GUSTY
WINDS AND LIGHTNING FOR THE NEXT HOUR OR TWO.

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 28, 1:20 PM CDTFlash Flood WarningEWXVal Verde4 hr

Nearby

Flash Flood Warnings in Texas, 1986Every flash flood warning in 1986

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.