Alert archive / Texas / Flash Flood Warnings in 1999

Flash Flood Warning 54, NWS Austin/San Antonio, TX

June 21, 1999Val Verde County, Texas

NWS Austin/San Antonio, TX issued this flash flood warning at Jun 21, 1999, 2:12 AM CDT for Val Verde County, Texas. It was in force for 2 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jun 21, 1999, 2:12 AM CDT (07:12 UTC)
Expired
Jun 21, 1999, 4:15 AM CDT
In force
2 hr
Issued by
NWS Austin/San Antonio, TX
Area
Whole counties

County Val Verde County, TX

The radar

The Laughlin AFB radar (KDFX), 109 km from the middle of the area, began a volume at 07:11 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Del Rio, TX (KDRT), launched 00:00Z, 7.2 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 00:00Z on 1999-06-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 563 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 1999-06-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 4 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
563 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
529 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
4 m²/s²
0-3 km storm-relative helicity
93 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.6

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KEWX 210720
FFWSAT
TXC465-210915-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
212 AM CDT MON JUN 21 1999

THE NATIONAL WEATHER SERVICE IN AUSTIN/SAN ANTONIO HAS ISSUED A

* FLASH FLOOD WARNING FOR THE FOLLOWING...
  VAL VERDE COUNTY IN TEXAS

* UNTIL 415 AM CDT
 
* WEATHER RADAR IS SHOWING MODERATE TO HEAVY RAIN MOVING FROM THE
  SOUTH INTO SOUTHERN VEL VERDE COUNTY. THE SHERIFFS DEPARTMENT IN
  DEL RIO REPORTED THE STREAM AND CREEKS RISING. THE HIGHWAY DEPARTMENT
  HAS ALREADY CLOSED HIGHWAY 163 NORTH OF COMSTOCK WHERE IT CROSSES  
  THE DRY DEVILS.
  
   RAINFALL WILL CONTINUE THROUGHT THE EARLY MORNING HOURS. 
   RAINFALL TOTALS OF TWO TO THREE INCHES CAN BE EXPECTED OVERNIGHT.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODS AND FLASH FLOODS. IF FLASH FLOODING IS OBSERVED ACT
QUICKLY. MOVE UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY
INf AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 21, 10:01 AM CDTFlash Flood WarningEWXBexar3 hr
Jun 21, 10:45 AM CDTFlash Flood WarningEWXWilson2 hr
Jun 21, 10:54 AM CDTFlash Flood WarningEWXBandera, Real2 hr
Jun 21, 11:35 AM CDTFlash Flood WarningEWXComal115 min
Jun 21, 12:19 PM CDTFlash Flood WarningEWXGuadalupe101 min
Jun 21, 1:11 PM CDTFlash Flood WarningEWXHays3 hr
Jun 21, 1:18 PM CDTFlash Flood WarningEWXComal, Guadalupe2 hr
Jun 21, 1:55 PM CDTFlash Flood WarningEWXCaldwell2 hr
Jun 21, 2:45 PM CDTFlash Flood WarningEWXCaldwell, Travis3 hr
Jun 21, 3:20 PM CDTFlash Flood WarningEWXWilliamson2 hr
Jun 21, 3:51 PM CDTFlash Flood WarningEWXMedina99 min
Jun 21, 5:20 PM CDTFlash Flood WarningEWXWilliamson70 min

Nearby

Flash Flood Warnings in Texas, 1999Every flash flood warning in 1999

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; radar from the NEXRAD Level II archive.