Flash Flooding in Texas, April 23, 2001

Name: Flash Flooding in Texas, April 23, 2001
Start: 2001-04-23T07:30
End: 2001-04-23T17:00
Location: Texas

April 23, 2001 · NWS EWX · 4 events in 4 counties and zones

4 flash flood, as filed by the National Weather Service.

Where it happened

Every event with a place to put it; 4 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.

Tornadoes
Tropical storms and surge
Floods
Wind
Hail
Winter weather
Heat and drought
Cold
Fire, smoke and dust
Marine and coastal
Other

Open the live radar over this ground

The toll

Deaths: 0
Injuries: 0
Property damage: $170,000
Crop damage: None recorded
Events: 4

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

What forecasters said that day

The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Austin/San Antonio, TX wrote its last area forecast discussion before the first event at Apr 23, 3:00 AM CST, 4 hours 30 minutes earlier.

Area forecast discussion, Apr 23, 3:00 AM CST, 4 hours 30 minutes before

SOUTH CENTRAL TEXAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
400 AM CDT MON APR 23 2001

MESO BNDRY TO WEST WL MOVE EAST AND GET SOME REINFORCEMENT FOR SE
MOVEMENT LATER THIS MRNG AS 1ST WAVE OF UPPER AIR TROF MOVES
ACROSS CNTRL U.S.  COOL AIR TO THE NORTH EXPECTED TO FILTER
INTO AREA ALSO LATER TODAY TAKING FRONT SOUTH OF CWA TONIGHT.
THIS PATTERN BODES WELL FOR GOOD CHANCE OF RAIN...ESPECIALLY
EAST PART OF CWA TODAY.

2ND WAVE ALOFT APPROACHES FROM THE WEST AND NW TONIGHT WL ALLOW RAIN
TO FORM SOUTHERN AND SOUTHEAST PART OF CWA.  AS THIS SYSTEM MOVES
EAST OF AREA ALOFT ON TUESDAY SFC RDG INCREASES ACROSS AREA AND CHC
OF RAIN DECREASES.  PROGS SHOW COOL NIGHT TUESDAY NIGHT BECOMING
MOSTLY SUNNY AND PLEASANT WEDNESDAY.

RIDGE ALOFT ATTEMPTS TO FORM OVR TO WEST OF S CNTRL TX WED AND
THURSDAY...THEN FORECASTS SHOW SLOW WEAKENING FRI THRU SUNDAY
AND MONDAY OF NEXT WEEK.

PRELIMS...
AUS 74/51/72/44 8310
SAT 74/53/73/48 8510
DRT 81/55/77/53 41-0

.EWX...NONE.

08/18/23

.EWX...NONE.

01/16

In the hours before

Local storm report, Apr 23, 5:05 AM CST, 2 hours 25 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO, TX
605 AM CDT MON APR 23 2001

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

1245 AM    8 NNW DEL RIO             TX   .75 INCH HAIL
04/23/01   VAL VERDE                      REPORTED BY CO-OP
                                          OBSERVERS

AS

Special weather statement, Apr 23, 5:18 AM CST, 2 hours 12 minutes before

TXZ171>173-183>194-202>209-217>225-228-231300-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
618 AM CDT MON APR 23 2001

EARLY THIS MORNING AN AREA OF SHOWERS AND THUNDERSTORMS WAS FROM
THE AUSTIN AREA WEST TO PARTS OF THE TEXAS HILL COUNTRY AND
EXTENDED SOUTH TO THE SAN ANTONIO AREA...HONDO AND UVALDE.

AN UPPER LEVEL WEATHER SYSTEM AND ITS ASSOCIATED COOL FRONT
MOVING ACROSS CENTRAL AND SOUTH CENTRAL TEXAS TODAY WILL BODE
WELL FOR MOSTLY CLOUDY SKIES...ALONG WITH A CHANCE OF RAIN...SHOWERS
AND THUNDERSTORMS.  SOME OF THE THUNDERSTORMS MAY BECOME SEVERE WITH
LOCALLY HEAVY RAIN POSSIBLE.

TO THE NORTH...A SURGE OF COOLER AIR IS EXPECTED TO MOVE THROUGH THE
AREA TODAY...KEEPING DAYTIME TEMPERATURES BELOW NORMAL.  COOLER
TEMPERATURES ARE EXPECTED TONIGHT.

ANOTHER WEATHER SYSTEM ALOFT WILL MOVE OVER THE AREA
TONIGHT...BRINGING A CHANCE OF RAIN OR SHOWERS TO THE
EAST AND SOUT|HEAT PARTS OF SOUTH CENTRAL TEXAS.

ADDITIONAL STATEMENTS WILL BE ISSUED AS CONDITIONS WARRANT.

Special weather statement, Apr 23, 6:06 AM CST, 1 hour 24 minutes before

TXZ171>173-183>194-202>209-217>225-228-231400-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
706 AM CDT MON APR 23 2001

AT 706 AM...AN AREA OF SHOWERS AND THUNDERSTORMS WAS FROM
THE GEORGETOWN AND AUSTIN AREAS TO THE SAN ANTONIO AREA...
THEN WEST TO NEAR HONDO.  AN AREA OF SCATTERED SHOWERS AND
THUNDERSTORMS WAS ALSO INDICATED BETWEEN UVALDE AND EAGLE PASS.

AN UPPER LEVEL WEATHER SYSTEM AND ITS ASSOCIATED COOL FRONT MOVING
ACROSS CENTRAL AND SOUTH CENTRAL TEXAS WAS PRODUCING THESE
SHOWERS AND THUNDERSTORMS.  THIS PATTERN WILL BODE WELL FOR MOSTLY
CLOUDY SKIES...ALONG WITH A CHANCE OF RAIN...SHOWERS AND
THUNDERSTORMS THIS MORNING.  SOME OF THE THUNDERSTORMS MAY BECOME
SEVERE WITH LOCALLY HEAVY RAIN POSSIBLE AND OCCASIONAL LIGHTNING.

TO THE NORTH...A SURGE OF COOLER AIR IS EXPECTED TO MOVE THROUGH THE
AREA TODAY...KEEPING DAYTIME TEMPERATURES BELOW NORMAL.  COOLER
TEMPERATURES ARE EXPECTED TONIGHT.

ANOTHER WEATHER SYSTEM ALOFT WILL MOVE OVER THE AREA TONIGHT...AND
MAY CAUSE A CHANCE OF RAIN OR SHOWERS OVER THE EAST AND SOUTHEAT
PARTS OF SOUTH CENTRAL TEXAS.

ON TUESDAY SKIES ARE EXPECTED TO BECOME PARTL?Y CLOUDY AND THEN
MOSTLY SUNNY.  MOSTLY CLEAR SKIES ARE EXPECTED TUESDAY NIGHT.

ADDITIONAL STATEMENTS WILL BE ISSUED AS CONDITIONS WARRANT.

The radar

The national radar mosaic for the moment the first event began.

Open the radar archive at this moment

Event by event

4 flash flood. Local standard time, as filed.

Flash Flood, Bexar

When: April 23, 7:30 AM CST to 5:00 PM CST
Where: Bexar County, Countywide
Property damage: $80,000
Reported by: EMERGENCY MANAGER
Coordinates: 29.449, -98.520 (the zone’s center; the record gives no point)

Rainfall over Bexar County averaged 1 to 2 inches, mainly in the southern part of the county. Several locations reported up to 4 inches during the morning period, with as much as 6 inches in the southern part of the county. Flash flooding continued through the mid and late morning and into the afternoon, finally ending in the late afternoon.

Flash Flood, Comal

When: April 23, 7:30 AM CST to 10:30 AM CST
Where: Comal County, Countywide
Property damage: $40,000
Reported by: LAW ENFORCEMENT
Coordinates: 29.808, -98.278 (the zone’s center; the record gives no point)

Widespread flash flooding developed in the morning across most of Comal County as general 2 to 3 inch rainfall fell across the county in the early morning hours. Maximum rainfall was just over 4 inches. The flash flooding ended just before noon.

Flash Flood, Guadalupe

When: April 23, 9:00 AM CST to 11:00 AM CST
Where: Guadalupe County, West Portion
Property damage: $30,000
Reported by: LAW ENFORCEMENT
Coordinates: 29.583, -97.949 (the zone’s center; the record gives no point)

Rainfall over Guadalupe County ranged generally from 1 to 2 inches, but up to 4 inches was reported in the extreme western part of the county. Flash flooding took place in the late morning between Marion and Seguin.

Flash Flood, Medina

When: April 23, 12:00 PM CST to 3:00 PM CST
Where: Medina County, East Portion
Property damage: $20,000
Reported by: LAW ENFORCEMENT
Coordinates: 29.356, -99.110 (the zone’s center; the record gives no point)

Rainfall in the western part of the county varied between 1 and 2 inches, with the eastern part of the county averaging from 2 to 3 inches. The highest amount was in the Castroville area where 5 inches were measured. Flash flooding continued through the early afternoon.

What these are

Flash Flood: Flooding that begins within six hours of the rain that causes it, or of a dam or levee failure or ice jam release, often with deadly speed.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

Every storm in Texas in 2001 Every state in 2001 This day in weather history Warnings in Texas, April 2001

Sources

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 5237861, 5238152, 5237963, 5237964.