Alert archive / Texas / Flash Flood Warnings in 2001

Flash Flood Warning 11, NWS San Angelo, TX

August 28, 2001Schleicher County, Texas

NWS San Angelo, TX issued this flash flood warning at Aug 28, 2001, 6:15 PM CDT for Schleicher County, Texas. It was in force for 4 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued: Aug 28, 2001, 6:15 PM CDT (23:15 UTC)
Expired: Aug 28, 2001, 10:15 PM CDT
In force: 4 hr
Issued by: NWS San Angelo, TX
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Schleicher County, TX

The radar

The San Angelo radar (KSJT), 54 km from the middle of the area, began a volume at 23:16 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 12:00Z, 11.3 hours before the alert went out and 174 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 221 J/kg
Mixed-layer CIN: -72 J/kg
Mixed-layer LCL: 975 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: -8 m²/s²
0-3 km storm-relative helicity: 14 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

000 
WGUS54 KSJT 282316
FFWSJT
TXC413-290315-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN ANGELO TX
615 PM CDT TUE AUG 28 2001

THE NATIONAL WEATHER SERVICE HAS ISSUED A

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

* UNTIL 1015 PM CDT

* AT 615 PM CDT...WEATHER SERVICE DOPPLER RADAR INDICATED SHOWERS
  AND THUNDERSTORMS WITH VERY HEAVY RAIN OVER THE EASTERN TWO-THIRDS
  OF SCHLEICHER COUNTY. THESE SHOWERS AND STORMS SHOWED LITTLE 
  MOVEMENT.   


* RAINFALL TOTALING 1.5 TO 2 INCHES HAS FALLEN OVER CENTRAL AND 
  EASTERN SCHLEICHER COUNTY SINCE 3 PM. AN ADDITIONAL 1 TO 2 INCHES
  OF RAIN IS EXPECTED THROUGH 830 PM. THIS RAIN WILL FALL ON ALREADY
  SATURATED GROUND...AND WILL CAUSE FLASH FLOODING. 

* THE SCHLEICHER COUNTY SHERIFF OFFICE REPORTED THAT HIGHWAY 915 WAS
  BEING CLOSED WEST OF ELDORADO ALONG FINNIGAN DRAW...DUE TO HIGH 
  WATER.

DO NOT DRIVE INTO AREAS WHERE WATER COVERS THE ROAD. THE WATER DEPTH
MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY. DO NOT ATTEMPT TO
DRIVE AROUND BARRICADES. MOST FLASH FLOOD DEATHS OCCUR IN VEHICLES.

LAT...LON 3097 10059 3075 10065 3073 10015 3103 10018

19

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.

NWS San Angelo, TX wrote its last area forecast discussion before this flash flood warning went out at Aug 28, 3:17 PM CDT, 2 hours 58 minutes earlier.

Area forecast discussion, Aug 28, 3:17 PM CDT, 2 hours 58 minutes before

WEST CENTRAL TEXAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN ANGELO TX
317 PM CDT TUE AUG 28 2001

LATEST WATER VAPOR IMAGERY SHOWS THE SOUTHWEST TO NORTHEAST ORIENTATION
OF THE MID/UPPER LEVEL SHEAR AXIS OVER WEST CENTRAL TEXAS. IMPRESSIVE
MOISTURE STREAM IS IN PLACE ACROSS THE FAR WESTERN GULF AND EXTENDS
NORTHWARD INTO CENTRAL AND EAST TX.

THE FORECAST WILL HINGE ON THE MOVEMENT...OR LACK THEREOF...OF THE SHEAR
AXIS. IT APPEARS THAT A STRONG UPPER LEVEL SYSTEM WILL BEGIN TO DIG TO
THE SOUTH OF ALASKA ON WEDNESDAY NIGHT. THIS SHOULD ACT TO EVENTUALLY
MOVE THIS SYSTEM TO THE EAST BUT I DO NOT EXPECT THE MOVEMENT TO BE
RAPID. IT LOOKS AS THOUGH THE AXIS WILL REMAIN IN A FAVORABLE POSITION
FOR PRECIP UNTIL LATE WEDNESDAY NIGHT. IN FACT...THE STACKING OF THE 500
AND 700 TROUGHS LOOKS IMPRESSIVE FOR THE UPCOMING OVERNIGHT AND INTO
WEDNESDAY MORNING.

WITH PWAT VALUES OF AROUND 1.5 INCHES EXPECTED THROUGH THURSDAY...WILL
ISSUE A FLASH FLOOD WATCH FOR THE SOUTH HALF OF THE CWA. THE RAINFALL
WILL LIKELY BE HEAVIEST OVER SOUTHEASTERN ZONES WITH LESSER AMOUNTS
FURTHER TO THE NORTHWEST. HOWEVER...WITH THE DEGREE OF SATURATION THAT IS
IN PLACE...RAINFALL AMOUNTS OF 1/2 INCH OR SO COULD CREATE PROBLEMS OVER
WESTERN PORTIONS OF THE WATCH AREA.

WILL KEEP THE HIGHEST POPS OVER THE SOUTHEAST TONIGHT AND BEGIN TO CUT
BACK ON POPS ON WEDNESDAY NIGHT INTO THURSDAY. CLOUD COVER TO PERSIST
THROUGH WEDNESDAY NIGHT SO WILL CONTINUE WITH BELOW NORMAL AFTERNOON
TEMPS.

IN THE EXTENDED...UPPER FLOW WILL FLATTEN A BIT AS MORE OF A WEST TO
NORTHWEST FLOW ALOFT TAKES SHAPE. PIECES OF ENERGY STILL LOOK AS THOUGH
THEY MAY BRING A SLIGHT CHANCE OF PRECIP ON SATURDAY. TEMPS TO REBOUND A
BIT WITH HIGHS RETURNING TO THE 90 DEGREE LEVEL THROUGH THE WEEKEND.

ABI 068/085/070/088 4422
SJT 067/083/069/088 6632
JCT 067/083/069/088 8732

.SJT...FLASH FLOOD WATCH FOR ZONES 71>73-76>78-154-155-168>170

21

In the hours before

Special weather statement, Aug 28, 2:05 PM CDT, 4 hours 10 minutes before

TXZ049-054-064>066-071>073-076>078-098-099-113-114-127-128-139-140-
154-155-168>170-282300-

WEST CENTRAL TEXAS HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SAN ANGELO TX
205 PM CDT TUE AUG 28 2001

...SCATTERED THUNDERSTORMS ARE EXPECTED ACROSS MUCH OF WEST CENTRAL
TEXAS THROUGH TONIGHT...

AS A MOIST AIRMASS COMBINES WITH A STATIONARY SHEAR AXIS IN THE MID
AND UPPER LEVELS...A CHANCE OF THUNDERSTORMS WILL EXIST THROUGH
TONIGHT. THE BEST CHANCE FOR THUNDERSTORM DEVELOPMENT WILL BE
TO THE SOUTHEAST OF AN OZONA...SAN ANGELO TO BROWNWOOD LINE.
THUNDERSTORMS THAT DO FORM ARE EXPECTED TO MOVE SLOWLY.

THOUGH THUNDERSTORMS ARE NOT EXPECTED TO REACH SEVERE LIMITS...HEAVY
RAINFALL...WIND GUSTS TO 30 MPH AND OCCASIONAL LIGHTNING WILL BE
POSSIBLE WITH THE STRONGER STORMS.

SPOTTER ACTIVATION IS NOT ANTICIPATED.

FOR THE SOUTHWEST TEXAS AND SOUTHEAST NEW MEXICO OUTLOOK SEE PRODUCT
LBBSPSMAF. FOR THE SOUTH PLAINS OUTLOOK SEE PRODUCT LBBSPSLBB. FOR
THE CENTRAL OKLAHOMA OUTLOOK SEE PRODUCT OKCSPSOKC. FOR THE NORTH
TEXAS OUTLOOK SEE PRODUCT FTWSPSFTW. FOR THE SOUTH CENTRAL TEXAS
OUTLOOK SEE PRODUCT SATSPSSAT.

15

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 28, 8:25 AM CDT	Flash Flood Warning	SJT	Irion	3 hr
Aug 28, 8:40 AM CDT	Flash Flood Warning	SJT	Tom Green	3 hr

Nearby

Flash Flood Warnings in Texas, 2001 Every flash flood warning in 2001

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.