Alert archive / Texas / Flash Flood Warnings in 1999

Flash Flood Warning 21, NWS San Angelo, TX

May 17, 1999Sutton County, Texas

NWS San Angelo, TX issued this flash flood warning at May 17, 1999, 7:38 PM CDT for Sutton County, Texas. It was in force for 3 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
May 17, 1999, 7:38 PM CDT (00:38 UTC)
Expired
May 17, 1999, 10:35 PM CDT
In force
3 hr
Issued by
NWS San Angelo, TX
Area
Whole counties

County Sutton County, TX

The radar

The San Angelo radar (KSJT), 97 km from the middle of the area, began a volume at 00:38 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, 0.6 hours before the alert went out and 129 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 1999-05-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4965 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 1999-05-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -67 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
4965 J/kg
Mixed-layer CIN
-25 J/kg
Mixed-layer LCL
1037 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
-67 m²/s²
0-3 km storm-relative helicity
-71 m²/s²
Significant tornado parameter
-1.7
Supercell composite
-11.7

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KSJT 180038
FFWSJT
TXC435-180335-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN ANGELO TX
738 PM CDT MON MAY 17 1999

THE NATIONAL WEATHER SERVICE IN SAN ANGELO HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SUTTON COUNTY IN WEST CENTRAL TEXAS

* UNTIL 1035 PM CDT

* AT 735 PM CDT... NATIONAL WEATHER SERVICE DOPPLER RADAR
  INDICATED A THUNDERSTORM WITH VERY HEAVY RAIN NEAR SONORA... MOVING
  SOUTH AT 10 MPH.

* RAINFALL ESTIMATES OF UP TO 2.5 INCHES HAD FALLEN ACROSS THE
  PARTS OF SOUTHERN SUTTON COUNTY. A SECOND THUNDERSTORM NEAR SONORA
  WILL MOVE ACROSS THE SAME AREA AND WILL PRODUCE AN ADDITIONAL ONE
  TO TWO INCHES OF RAIN... WHICH MAY CAUSE FLOODING OF LOW WA6TER
  CROSSINGS AND SMALL CREEKS.

DO NOT DRIVE INTO AREAS WHERE WATER COVERS THE ROAD. THE WATER
DEPTH MAY BE TOO GREAT FOR SAFE PASSAGE AND THE ROAD UNDERNEATH MAY
NOT BE INTACT.

TEW/GJ

The office that day

Everything else NWS San Angelo, TX issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 17, 7:09 PM CDTSevere Thunderstorm WarningSJTSutton66 min
May 17, 7:11 PM CDTSevere Thunderstorm WarningSJTTom Green64 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.