Alert archive / Texas / Flash Flood Warnings in 1990

Flash Flood Warning 70, NWS San Angelo, TX

September 21, 1990Sterling County, Texas

NWS San Angelo, TX issued this flash flood warning at Sep 21, 1990, 4:55 PM CDT for Sterling County, Texas. It was in force for 2 hr.

The area

The counties it named.

The facts

Issued
Sep 21, 1990, 4:55 PM CDT (21:55 UTC)
Expired
Sep 21, 1990, 7:21 PM CDT
In force
2 hr
Issued by
NWS San Angelo, TX
Area
Whole counties

County Sterling 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

Midland Regional, TX (KMAF), launched 12:00Z, 9.9 hours before the alert went out and 109 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, Midland Regional, TX at 12:00Z on 1990-09-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Midland Regional, TX at 12:00Z on 1990-09-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 105 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
NaN m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
105 m²/s²
0-3 km storm-relative helicity
85 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.3

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, Sep 21, 11:44 AM CDT, 5 hours 11 minutes before
TXZ012-015-019-024-029-030-210030-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ABILENE TX
1130 AM CDT FRI SEP 21 1990

A FLASH FLOOD WATCH IS IN EFFECT FOR SCURRY...FISHER...MITCHELL
AND NOLAN COUNTIES OF THE BIG COUNTRY UNTIL 700 PM CDT....

AT 1130 AM CDT SHOWERS AND THUNDERSTORMS WERE OCCURRING NORTH OF LINE
FROM ROBERT LEE TO ABILENE MINERAL WELLS. THE HEAVIEST RAIN WAS
LOCATED ALONG A LINE FROM LORAINE TO STAMFORD TO NEAR HUBBARD CREEK
RESERVOIR. THE RAIN AREA IS MOVING SOUTHEAST AT 5 TO 10 MPH.

VERY HEAVY RAIN...STRONG GUSTY WINDS...AND LOCALIZED FLOODING OF LOW
LYING AREAS ARE LIKELY IN THESE STORMS.

DURING THE PAST 12 HOURS RAINFALL REPORTED OF 2 TO 3 INCHES ACROSS
THE NORTHERN COUNTIES OF THE BIG COUNTRY.

PERSONS IN OR CLOSE TO THE FLASH FLOOD WATCH AREA SHOULD STAY ALERT
FOR RISING WATER AND BE READY TO TAKE IMMEDIATION ACTION IF FLOODING
IS SIGHTED OR REPORTED.

STAY TUNED TO NOAA WEATHER RADIO FOR THE~ LATEST WEATHER INFORMATION.
Special weather statement, Sep 21, 3:54 PM CDT, 1 hour 1 minute before
TXZ017-029-018-212300-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SAN ANGELO TX
353 PM CDT FRI SEP 21 1990

...FLASH FLOOD WATCH IN EFFECT FOR CONCHO VALLEY EXCEPT EXTREME
SOUTHEAST...

AT 330PM SAN ANGELO RADAR INDICATED A LINE OF THUNDERSTORMS FORM NEAR
OZONA NORTHEAST TO WEST OF MERTZON...CARLSBAD AND INTO THE BIG
COUNTRY.  THESE THUNDERSTORMS WITH VERY HEAVY RAINS...GUSTY
WINDS...DANGEROUS LIGHTNING AND POSSIBLE SMALL HAIL IS SLOWLY MOVING
TO THE EAST AT 10 MPH.

THE GROUNDS ALREADY SATURATED WITH ADDITIONAL RAINFALLS WILL CAUSE
FLOODING PROBLEMS IN THE CENTRAL CONCHO VALLEY FOR THIS AFTERNOON AND
THIS EVENING.  SATELLITE ESTIMATES OF RAINFALL IS VERY HEAVY IN THE
AREA FROM CROCKETT COUNTY NORTHEAST INTO STERLING COUNTY.   ALL
PERSONS SHOULD TAKE NECESSARY PRECAUTIONS FOR ADDITIONAL HEAVY
RAINFALL IN THE NEXT SEVERAL HOURS.

STAY TUNED TO LOCAL RADIO AND TELEVISION STATIONS AND NOAA WEATHER
RADIO FOR UP2DATED INFORMATION...

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 20, 9:18 PM CDTFlash Flood WarningSJTSutton12 hr
Sep 21, 4:55 PM CDTFlash Flood WarningSJTCoke, Runnels, Tom Green2 hr

Nearby

Flash Flood Warnings in Texas, 1990Every flash flood warning in 1990

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.