Alert archive / Texas / Flash Flood Warnings in 2002

Flash Flood Warning 41, NWS San Angelo, TX

July 5, 2002Mason County, San Saba County, Texas

NWS San Angelo, TX issued this flash flood warning at Jul 5, 2002, 4:01 AM CDT for Mason County, San Saba 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 5, 2002, 4:01 AM CDT (09:01 UTC)
Expired
Jul 5, 2002, 8:00 AM CDT
In force
4 hr
Issued by
NWS San Angelo, TX
Area
Counties, with a storm outline in the text

Counties Mason County, TX, San Saba County, TX

The radar

The Austin/San Antonio radar (KEWX), 152 km from the middle of the area, began a volume at 09:02 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.

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

Del Rio, TX (KDRT), launched 00:00Z, 9.0 hours before the alert went out and 237 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 2002-07-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2373 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 2002-07-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 17 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
2373 J/kg
Mixed-layer CIN
-9 J/kg
Mixed-layer LCL
1055 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
17 m²/s²
0-3 km storm-relative helicity
248 m²/s²
Significant tornado parameter
0.0
Supercell composite
5.2

Open this sounding in Storm Lab

The text

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

000 
WGUS54 KSJT 050901
FFWSJT
TXC319-411-051300-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN ANGELO TX
400 AM CDT FRI JUL 5 2002

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SAN SABA COUNTY IN NORTH CENTRAL TEXAS
  MASON COUNTY IN SOUTH CENTRAL TEXAS

* UNTIL 800 AM CDT

* AT 351 AM CDT...WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY 
  RAIN NEAR LOYAL VALLEY...OR ABOUT 10 MILES SOUTHEAST  OF           
  MASON...MOVING NORTH AT 15 MPH. WIDESPREAD SHOWERS AND         
  THUNDERSTORMS WITH HEAVY RAIN WERE ALSO INDICATED OVER MUCH OF SAN 
  SABA COUNTY...ALSO MOVING NORTH AT 15 MPH. 

* RAINFALL TOTALING 1 TO 2 INCHES HAS FALLEN IN THE WARNED           
  AREA...WITH ADDITIONAL RAINFALL UP TO 4 INCHES EXPECTED THROUGH    
  800 AM CDT.  

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 3052 9931 3053 9898 3103 9851 3134 9888
3 follow-up statements
000 
WGUS74 KSJT 051026
FFSSJT
TXC411-051300-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN ANGELO TX
525 AM CDT FRI JUL 5 2002

...A FLASH FLOOD WARNING REMAINS IN EFFECT FOR SAN SABA COUNTY UNTIL 
8 AM CDT...

AT 515 AM CDT...RADAR ESTIMATED THAT 1 TO 2 INCHES OF RAIN HAVE 
FALLEN FROM CHAPPEL TO JUST EAST OF THE CITY OF SAN SABA SINCE 3 AM. 
1/4 TO 3/4 INCHES OF RAIN HAS FALLEN OVER THE REST OF SAN SABA 
COUNTY.

WIDESPREAD SHOWERS AND THUNDERSTORMS WILL PRODUCE RAINFALL AMOUNTS 
OF 1/4 TO 1/2 INCH PER HOUR.  ADDITIONAL RAINFALL UP TO 1 1/2 
INCHES ARE POSSIBLE THROUGH 8 AM CDT. THIS WILL CONTINUE TO PRODUCE 
FLOODING OF LOW WATER CROSSINGS AND POOR DRAINAGE AREAS.
000 
WGUS74 KSJT 051034
FFSSJT
TXC319-051300-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN ANGELO TX
533 AM CDT FRI JUL 5 2002

...A FLASH FLOOD WARNING REMAINS IN EFFECT FOR MASON COUNTY UNTIL 
800 AM CDT...

AT 530 AM CDT...DOPPLER RADAR ESTIMATED THAT 1 TO 2 INCHES OF RAIN 
HAVE FALLEN FROM JUST NORTH OF LOYAL VALLEY TO 5 MILES SOUTH OF 
FREDONIA SINCE 3 AM.

THE EASTERN HALF OF MASON COUNTY CAN EXPECT ANOTHER 1/2 TO 1 1/2 
INCHES OF RAIN THROUGH 8 AM...AS WIDESPREAD SHOWERS AND 
THUNDERSTORMS MOVE NORTH AT 15 MPH. THIS WILL CONTINUE TO PRODUCE 
FLOODING OF LOW WATER CROSSINGS AND POOR DRAINAGE AREAS.
000 
WGUS74 KSJT 051205
FFSSJT
TXC411-051300-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN ANGELO TX
700 AM CDT FRI JUL 5 2002

...A FLASH FLOOD WARNING REMAINS IN EFFECT FOR SAN SABA COUNTY UNTIL 
800 AM CDT...

AT 655 AM CDT...THE SAN SABA SHERIFF OFFICE REPORTED WATER FLOODING 
THE ROADWAY AT HIGHWAY 16 AND FM 1480.

RAINFALL AMOUNTS OF 1/10 TO 1/4 INCH CAN BE EXPECTED ACROSS SAN SABA 
COUNTY THROUGH 8 AM. LOW WATER CROSSING AND LOW LYING AREAS MAY BE 
FILLED. DO NOT DRIVE THROUGH WATER OF UNKNOWN DEPTH.

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 5, 2:49 AM CDT, 1 hour 12 minutes earlier.

Area forecast discussion, Jul 5, 2:49 AM CDT, 1 hour 12 minutes before
WEST CENTRAL TEXAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN ANGELO TX
249 AM CDT FRI JUL 5 2002

SO THIS IS JULY IN WEST TEXAS   MORE RAIN IS ON THE WAY

FOR THE PAST WEEK OUR ATTENTION HAS BEEN FOCUSED ON THE SHEAR AXIS
AND ASSOCIATED RAINS THAT CAUSED THE TERRIBLE FLOODING TO OUR EAST.
HAD BEEN THINKING THAT WOULD MOVE ACROSS OUR AREA AND PRODUCE
RAINS...WHILE WE HAVE SEEN THE IMPACT OF THAT SYSTEM...TONIGHT A
WHOLE NEW FOCUS HAS CHANGED OUR ATTENTION FURTHER WEST.

AN UPPER LOW ALONG THE AZ/NM BORDER LOOKS LIKE IT WILL PLAY A ROLE
IN OUR WEATHER FOR THE NEXT SEVERAL DAYS.  THIS LOW HAS BEEN VERY
EFFECTIVE AT PRODUCING THUNDERSTORM OVER NEW MEXICO.  REMNANTS OF
THE NEW MEXICO STORMS ARE TRAVERSING WEST TEXAS TONIGHT.  IT APPEARS
THAT WITH SUFFICIENT SURFACE INFLOW...THOSE STORMS SHOULD PUSH
ACROSS OUR AREA DURING THE DAY...THEREFORE WILL PLACE RELATIVELY
HIGH POPS TODAY.

FOR THE NEXT COUPLE OF DAYS THE LOW WILL GRADUALLY MOVE EAST AND
CONTINUE TO SPIT OUT PIECES OF ENERGY TO PRODUCE TSTRMS...EACH
MOVING OUR WAY.  THIS WILL REQUIRE POPS IN ALMOST EVERY FORECAST
PERIOD...IT WILL ALSO PROVIDE THE ENERGY NEEDED TO KICK OUT THE
PESKY SHEAR AXIS THAT HAS PERSISTED OVER SOUTH AND CENTRAL TEXAS.

WITH MODELS SHOWING CONSISTENCY OVER THE PAST SEVERAL RUNS...THE LOW
REMAINS IN THE SOUTHWEST...THE CENTER OF THE SFC HIGH TAKE HOLD WELL
TO OUR NORTHWEST.  THAT PLACES WCNTRL TX UNDER NORTHERLY FLOW ...SO
ALAS CHANCES OF A COLD FRONT AND CONTINUED CONVECTION REMAIN IN OUR
FUTURE.  WITH ALL THAT SAID...WILL MAKE WHOLESALE CHANGES TO THE
EXTENDED AND INCLUDE CHANCES OF RAIN THROUGHOUT AND COOLER THAN
NORMAL TEMPS...YUP ITS NOT A TYPICAL JULY FORECAST...BUT IT MAY BE
OUR CHANCE TO FILL SOME RESERVOIRS.  MAY NOT BE A DROUGHT
BUSTER...BUT IT AINT GOING TO HURT.

AT THIS POINT...AM NOT SURE WHAT I WILL DO WITH ANY FLASH FLOOD
WATCHES...OUR EASTERN COUNTIES HAVE BEEN HAMMERED OVER THE PAST
COUPLE OF DAYS...HOWEVER NOT MUCH RAIN THERE OVERNIGHT...SINCE THE
MAIN THREAT FOR HEAVIER RAIN TODAY APPEARS TO BE IN OUR WESTERN
COUNTIES ...MAY HOLD OFF ON ANY WATCHES...BUT WILL RESERVE THE RIGHT
TO MAKE LAST MINUTE CHANGES.  OKAY..LATE DECISION...LOOKING AT THE
RAIN MOVING INTO OUR SOUTHEAST COUNTIES...WILL GO WITH A FLASH FLOOD
WATCH FOR SOUTHEAST.

ABI 85/70/88/70  5432
SJT 86/70/88/70  6422
JCT 86/70/90/70  6322

.SJT...FLASH FLOOD WATCH TODAY FOR
MASON...MENARD...KIMBLE...MCCULLOCH...SAN SABA...BROWN AND COLEMAN
COUNTIES.

25

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 5, 8:10 AM CDTFlash Flood WarningSJTKimble, Mason4 hr
Jul 5, 12:14 PM CDTFlash Flood WarningSJTKimble, Mason6 hr
Jul 5, 3:52 PM CDTFlash Flood WarningSJTTom Green113 min

Nearby

Flash Flood Warnings in Texas, 2002Every 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; radar from the NEXRAD Level II archive.