Alert archive / Texas / Flash Flood Warnings in 2002

Flash Flood Warning 74, NWS San Angelo, TX

July 29, 2002Tom Green County, Texas

NWS San Angelo, TX issued this flash flood warning at Jul 29, 2002, 1:18 PM CDT for Tom Green 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 as issued.

The facts

Issued: Jul 29, 2002, 1:18 PM CDT (18:18 UTC)
Expired: Jul 29, 2002, 5:15 PM CDT
In force: 4 hr
Issued by: NWS San Angelo, TX
Area: Counties, with a storm outline in the text

County Tom Green County, TX

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this flash flood warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Midland Regional, TX (KMAF), launched 12:00Z, 6.3 hours before the alert went out and 173 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: 3934 J/kg
Mixed-layer CIN: -79 J/kg
Mixed-layer LCL: 895 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 114 m²/s²
0-3 km storm-relative helicity: 228 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 291818
FFWSJT
TXC451-292215-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN ANGELO TX
117 PM CDT MON JUL 29 2002

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  TOM GREEN COUNTY IN SOUTHWEST TEXAS

* UNTIL 515 PM CDT

* AT 116 PM CDT...WEATHER SERVICE DOPPLER RADAR INDICATED VERY 
  HEAVY RAIN OVER NORTHEAST SAN ANGELO.  THE AREA OF HEAVY RAIN 
  WAS NEARLY STATIONARY.

* RAINFALL TOTALING 1 TO 2 INCHES HAS FALLEN ACROSS NORTHERN AND
  CENTRAL TOM GREEN COUNTY...WITH ADDITIONAL RAINFALL UP TO 2 INCHES
  EXPECTED THROUGH 515 PM CDT. FLOODING OF ROADS...CREEKS AND STREAMS
  WILL BE LIKELY ACROSS NORTHERN AND EASTERN SAN ANGELO AND NEAR 
  GRAPE CREEK.

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 3131 10061 3129 10022 3164 10025 3164 10065

1 follow-up statement

000 
WGUS74 KSJT 291953
FFSSJT
TXC451-292015-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN ANGELO TX
253 PM CDT MON JUL 29 2002

...THE NATIONAL WEATHER SERVICE IN SAN ANGELO HAS CANCELLED THE FLASH
FLOOD WARNING FOR TOM GREEN COUNTY...

AT 246 PM CDT...THE HEAVY RAIN HAS ENDED OVER TOM GREEN COUNTY AND 
FLOODING IS NO LONGER EXPECTED...THEREFORE THE FLASH FLOOD WARNING 
FOR TOM GREEN COUNTY HAS BEEN CANCELLED.

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 Jul 29, 10:47 AM CDT, 2 hours 31 minutes earlier.

Area forecast discussion, Jul 29, 10:47 AM CDT, 2 hours 31 minutes before

WEST CENTRAL TEXAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN ANGELO TX
1047 AM CDT MON JUL 29 2002

SENT AN UPDATE TO RAISE POPS FOR THE BIG COUNTRY AS COMPLEX OF
THUNDERSTORMS CONTNIUES TO BUILD INTO THE AREA FROM THE NORTHEAST.
THIS ACTIVITY SHOULD GRADUALLY WEAKEN INTO THE EARLY
AFTERNOON...HOWEVER EXPECT MOST PLACES ALONG I-20 WILL SEE
MEASURABLE RAIN. IF ABILENE PICKS UP 0.15 INCHES THEY WILL BREAK THE
ALL TIME JULY RAINFALL RECORD.

ALSO LOWERED TEMEPRATURES A BIT DUE TO RAIN AND CLOUDS.

27/BRAZZELL

---------------4AM DISCUSSION--------------------------------------
A NORTHEAST TO SOUTHWEST SHEAR AXIS TO LINGER ACROSS OUR CWFA TODAY
THROUGH TUESDAY...WITH THE FEATURE DRIFTING NORTHWEST AND WEAKENING
TUESDAY NIGHT INTO WEDNESDAY. ETA MODEL APPEARS TO HAVE BETTER
CONSISTENCY AND HANDLING OF THIS FEATURE AND ASSOCIATED POPS.
CONVECTIVE ACTIVITY FROM YESTERDAY EVENING MAY BE LEAVING BEHIND A
MCV IN OUR CENTRAL/SOUTH CENTRAL COUNTIES. OUTFLOW BOUNDARIES ALSO
LEFTOVER IN OUR COUNTIES. COMBINATION OF THESE FEATURES AND WEAKER
CAPPING TODAY SHOULD YIELD THUNDERSTORM DEVELOPMENT THIS AFTERNOON
INTO EARLY TONIGHT...WITH COVERAGE PERHAPS A LITTLE GREATER THAN
SUNDAY. WITH PRECIPITABLE WATER VALUES PROGGED TO BE IN THE 1.5 TO
1.75 INCH RANGE ALONG WITH WEAK STEERING FLOW...LOCALLY HEAVY
RAINFALL WILL LIKELY OCCUR. CONSIDERING A MENTION OF THIS IN THE
ZONES. WILL BOOST POPS A BIT IN ZONES FOR TODAY AND TONIGHT. HAVE
SOME UNCERTAINTY ON WHERE THE MOST CONCENTRATED THUNDERSTORM ACTIVITY
WILL OCCUR...HOWEVER. STILL ANTICIPATE CONVECTIVE DEVELOPMENT AGAIN
TUESDAY AFTERNOON...BUT WITH LESS COVERAGE THAN TODAY. THE ETA
THICKNESS AND 850 MILLIBAR TEMPERATURE TRENDS...ALONG WITH MORE
DIURNAL CLOUD DEVELOPMENT...INDICATE TEMPS BACKING OFF A FEW DEGREES
TODAY AND TUESDAY.

WEDNESDAY INTO LATE WEEK...UPPER HIGH BUILDS/SHIFTS EASTWARD FROM
FOUR CORNERS REGION ACROSS CENTRAL PLAINS TOWARD THE OHIO AND
TENNESSEE VALLEYS...WITH WEST CENTRAL TX ON ITS SOUTHERN PERIPHERY.
AT THIS TIME LOOKS DRY AND A LITTLE WARMER FOR WEST CENTRAL TX. WILL
BE WATCHING FOR DEVELOPMENT AND TRACK OF ANY EASTERLY WAVES.

ABI 094/073/093/072 4422
SJT 097/074/096/073 4422
JCT 093/072/093/071 3321

.SJT...NONE.

19

In the hours before

Local storm report, Jul 29, 10:03 AM CDT, 3 hours 15 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN ANGELO, TX
1003 AM CDT MON JUL 29 2002

TIME(CDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0440 PM    1 E HAMLIN                TX   60 MPH TSTM WIND GUST
07/28/02   JONES                          SEVERAL TREES AND POWER
                                          LINES WERE DOWN DUE TO THE
                                          HIGH WINDS.

0720 PM    4 NW SAN ANGELO           TX   .75 INCH HAIL
07/28/02   TOM GREEN

0720 PM    4 NW SAN ANGELO           TX   60 MPH TSTM WIND GUST
07/28/02   TOM GREEN                      WINDS DAMAGED A STORAGE
                                          SHED.

0445 PM    3SE HAWLEY                TX   70 MPH TSTM WIND GUST
07/28/02   JONES                          HIGH WINDS KNOCKED DOWN
                                          TREES AND MOVED A TRASH
                                          DUMPSTER.

0830 PM    MERKEL                    TX   1.75 INCH HAIL
07/28/02   TAYLOR

0856 PM    TYE                       TX   1.75 INCH HAIL
07/28/02   TAYLOR

0743 PM    SAN ANGELO                TX   .88 INCH HAIL
07/28/02   TOM GREEN                      HAIL OCURRED AT CHADBOURNE
                                          AND AVE L

0750 PM    SAN ANGELO                TX   FLASH FLOODS
07/28/02   TOM GREEN                      STREET FLOODING REPORTED
                                          ON THE EASTERN AND NORTHEN
                                          SIDE OF SAN ANGELO

0915 PM    LAWN                      TX    WIND DAMAGE
07/28/02   TAYLOR                         POWER LINES DOWN IN LAWN

0915 PM    LAWN                      TX   .75 INCH HAIL
07/28/02   TAYLOR

0855 PM    1 N TYE                   TX    WIND DAMAGE
07/28/02   TAYLOR                         BARN BLOWN DOWN JUST NORTH
                                          OF I 20

0810 PM    4 SE SAN ANGELO           TX   60 MPH TSTM WIND GUST
07/28/02   TOM GREEN

0830 PM    5 SE SAN ANGELO           TX   WIND DAMAGE
07/28/02   TOM GREEN                      SEVERAL POWER LINES
                                          KNOCKED DOWN. THERE WAS
                                          ALSO SOME DAMGE TO A TOWN
                                          AND COUNTRY STORE IN THE
                                          AREA.

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 28, 7:32 PM CDT	Flash Flood Warning	SJT	Tom Green	3 hr
Jul 28, 8:03 PM CDT	Severe Thunderstorm Warning	SJT	Tom Green	57 min
Jul 28, 8:40 PM CDT	Severe Thunderstorm Warning	SJT	Jones, Taylor	35 min
Jul 28, 9:02 PM CDT	Flash Flood Warning	SJT	Irion	3 hr
Jul 28, 9:12 PM CDT	Severe Thunderstorm Warning	SJT	Tom Green	63 min
Jul 28, 9:46 PM CDT	Flash Flood Warning	SJT	Coke	59 min
Jul 28, 10:01 PM CDT	Severe Thunderstorm Warning	SJT	Tom Green	29 min
Jul 28, 10:13 PM CDT	Flash Flood Warning	SJT	Coke, Tom Green	107 min
Jul 29, 11:45 AM CDT	Severe Thunderstorm Warning	SJT	Coke	60 min

Nearby

Flash Flood Warnings in Texas, 2002 Every flash flood warning in 2002

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.