Alert archive / Texas / Flash Flood Warnings in 2026

Flash Flood Warning 21, NWS San Angelo, TX

May 21, 2026Mason County, Texas

NWS San Angelo, TX issued this flash flood warning at May 21, 2026, 4:10 PM CDT for Mason County, Texas. It was in force for 3 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
May 21, 2026, 4:10 PM CDT (21:10 UTC)
Expired
May 21, 2026, 7:15 PM CDT
In force
3 hr
Issued by
NWS San Angelo, TX
Area
Storm-based polygon
Damage threat
Considerable
Flood severity
None

County Mason County, TX

The radar

The Austin/San Antonio radar (KEWX), 148 km from the middle of the area, began a volume at 21:11 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, 9.2 hours before the alert went out and 210 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 12:00Z on 2026-05-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1394 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 12:00Z on 2026-05-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 38 square meters per square second.19395878Sfc1 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
1394 J/kg
Mixed-layer CIN
-52 J/kg
Mixed-layer LCL
735 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
38 m²/s²
0-3 km storm-relative helicity
85 m²/s²
Significant tornado parameter
0.8
Supercell composite
3.4

Open this sounding in Storm Lab

The text

As transmitted.

432 
WGUS54 KSJT 212110
FFWSJT
TXC319-220015-
/O.NEW.KSJT.FF.W.0021.260521T2110Z-260522T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service San Angelo TX
410 PM CDT Thu May 21 2026

The National Weather Service in San Angelo has issued a

* Flash Flood Warning for...
  Southern Mason County in west central Texas...

* Until 715 PM CDT.

* At 410 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 3 inches of rain 
  have fallen. Additional rainfall amounts of 1 to 2 inches are 
  possible in the warned area. Flash flooding is ongoing or expected 
  to begin shortly.

  HAZARD...Life threatening flash flooding. Thunderstorms
           producing flash flooding.

  SOURCE...Radar.

  IMPACT...Life threatening flash flooding of creeks and streams,
           urban areas, highways, streets and underpasses.

* Some locations that will experience flash flooding include...
  Hilda, Hedwigs Hill, Loyal Valley and Us-87 Near The 
  Mason-Gillespie County Line.

This includes the following Low Water Crossings...
Chimney Hollow crossing Big Bluff Creek, Mill Creek crossing Mill 
Creek, Jeffers Lane crossing, West Simonsville crossing, Peters 
Creek crossing Peters Creek, Simonsville crossing Bader Creek, 
Simonsville crossing Beaver Creek, Ranch Road 783 crossing Bader 
Creek, Loeffler crossing Beaver Creek and Ranch Road 783 crossing 
Deer Creek.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

&&

LAT...LON 3050 9897 3051 9948 3072 9948 3071 9897

FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

AW

The office that day

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

IssuedProductOfficeCountiesLasted
May 20, 7:03 PM CDTSpecial Weather StatementSJTMenard27 min
May 20, 7:16 PM CDTSpecial Weather StatementSJTCrockett44 min
May 20, 7:25 PM CDTSevere Thunderstorm WarningSJTCrockett, Schleicher36 min
May 20, 7:51 PM CDTSpecial Weather StatementSJTMenard39 min
May 20, 7:55 PM CDTSpecial Weather StatementSJTSchleicher50 min
May 20, 8:30 PM CDTSpecial Weather StatementSJTMenard30 min
May 20, 8:36 PM CDTSevere Thunderstorm WarningSJTMcCulloch, Mason, Menard39 min
May 20, 8:41 PM CDTSevere Thunderstorm WarningSJTSchleicher, Sutton64 min
May 20, 9:08 PM CDTSevere Thunderstorm Warning Destructive damage threatSJTMcCulloch, Mason, Menard28 min
May 20, 9:21 PM CDTSpecial Weather StatementSJTSutton54 min
May 20, 9:34 PM CDTSevere Thunderstorm WarningSJTKimble, Menard, Schleicher, Sutton56 min
May 20, 10:21 PM CDTSpecial Weather StatementSJTKimble54 min
May 20, 10:49 PM CDTAreal Flood AdvisorySJTKimble, Menard, Sutton3 hr
May 20, 11:12 PM CDTFlash Flood Warning Considerable damage threatSJTKimble, Mason3 hr
May 20, 11:21 PM CDTSpecial Weather StatementSJTKimble, Mason54 min
May 20, 11:36 PM CDTSevere Thunderstorm WarningSJTMason54 min
May 20, 11:52 PM CDTAreal Flood AdvisorySJTMenard3 hr
May 21, 3:38 AM CDTAreal Flood AdvisorySJTMenard, Schleicher3 hr
May 21, 8:42 AM CDTAreal Flood AdvisorySJTCoke, Sterling2 hr
May 21, 9:04 AM CDTFlash Flood Warning Considerable damage threatSJTCoke, Sterling3 hr
May 21, 9:57 AM CDTAreal Flood AdvisorySJTCoke, Runnels, Tom Green3 hr
May 21, 10:52 AM CDTAreal Flood AdvisorySJTColeman, Concho, Runnels, Tom Green3 hr
May 21, 11:01 AM CDTAreal Flood AdvisorySJTFisher, Jones, Nolan, Taylor3 hr
May 21, 11:31 AM CDTFlash Flood Warning Considerable damage threatSJTRunnels3 hr
May 21, 12:14 PM CDTAreal Flood AdvisorySJTCoke2 hr
May 21, 12:54 PM CDTAreal Flood AdvisorySJTSterling, Tom Green2 hr
May 21, 1:18 PM CDTSpecial Weather StatementSJTMenard27 min
May 21, 1:46 PM CDTSpecial Weather StatementSJTMenard44 min
May 21, 2:00 PM CDTSpecial Weather StatementSJTUpton30 min
May 21, 2:01 PM CDTAreal Flood AdvisorySJTKimble, Menard, Schleicher3 hr
May 21, 2:11 PM CDTSpecial Weather StatementSJTMenard49 min
May 21, 2:21 PM CDTSevere Thunderstorm WarningSJTCrockett54 min
May 21, 2:33 PM CDTAreal Flood AdvisorySJTMcCulloch117 min
May 21, 3:00 PM CDTFlash Flood Warning Considerable damage threatSJTKimble, Menard3 hr
May 21, 3:02 PM CDTSpecial Weather StatementSJTCrockett43 min
May 21, 3:13 PM CDTFlash Flood Warning Considerable damage threatSJTMcCulloch, San Saba3 hr
May 21, 3:27 PM CDTSevere Thunderstorm WarningSJTCrockett63 min
May 21, 3:42 PM CDTFlash Flood Warning Considerable damage threatSJTKimble3 hr
May 21, 3:46 PM CDTAreal Flood AdvisorySJTMason3 hr
May 21, 3:58 PM CDTSpecial Weather StatementSJTMason47 min
May 21, 3:59 PM CDTAreal Flood AdvisorySJTSan Saba3 hr
May 21, 4:08 PM CDTSpecial Weather StatementSJTCrockett52 min
May 21, 4:21 PM CDTSevere Thunderstorm WarningSJTMason39 min
May 21, 4:25 PM CDTSevere Thunderstorm Warning Considerable damage threatSJTCrockett65 min
May 21, 5:15 PM CDTSevere Thunderstorm Warning Considerable damage threatSJTSchleicher, Sutton60 min
May 21, 5:16 PM CDTAreal Flood AdvisorySJTCrockett, Schleicher, Sutton3 hr
May 21, 5:19 PM CDTSpecial Weather StatementSJTCrockett41 min
May 21, 5:20 PM CDTSpecial Weather StatementSJTSutton40 min
May 21, 5:45 PM CDTSpecial Weather StatementSJTSutton45 min
May 21, 5:54 PM CDTSevere Thunderstorm WarningSJTSutton36 min
May 21, 5:56 PM CDTSpecial Weather StatementSJTCrockett34 min
May 21, 6:03 PM CDTSpecial Weather StatementSJTKimble42 min

Nearby

Flash Flood Warnings in Texas, 2026Every flash flood warning in 2026

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.