Alert archive / Texas / Flash Flood Warnings in 2021

Flash Flood Warning 25, NWS San Angelo, TX

August 15, 2021Irion County, Tom Green County, Texas

NWS San Angelo, TX issued this flash flood warning at Aug 15, 2021, 7:16 AM CDT for Irion County, Tom Green County, Texas. It was in force for 119 min. 3 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Aug 15, 2021, 7:16 AM CDT (12:16 UTC)
Expired: Aug 15, 2021, 9:15 AM CDT
In force: 119 min
Issued by: NWS San Angelo, TX
Area: Storm-based polygon
Flood severity: None

Counties Irion County, TX, Tom Green County, TX

The radar

The San Angelo radar (KSJT), 18 km from the middle of the area, began a volume at 12:17 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.

What was reported inside it

Time	Report	Where	Remark
Aug 15, 7:35 AM CDT	FLASH FLOOD	3 Sw San Angelo, TX	VERY HEAVY RAINFALL CAUSING URBAN FLOODING, ENOUGH WHEN VEHICLES WERE CLOSE TO GETTING STUCK. VERY DIFFICULT TO SEE ROAD EVEN WITH WIPERS ON FULL SPEED. MAINLY FROM KNICKERBOCKER RD. TO SOUTHWEST BLVD ON SOUTHLAND BLVD.
Aug 15, 7:45 AM CDT	HEAVY RAIN 2.49	4 Wsw San Angelo, TX	2.49 INCHES FELL SINCE 6:30AM, SHEETS OF RAIN FALLING, URBAN FLOODING AND LOCALIZED PONDING.
Aug 15, 8:04 AM CDT	FLASH FLOOD	2 Sw San Angelo, TX	AN AMATEUR RADIO OPERATOR REPORTED THAT SUL ROSS AT THE RED ARROYO WAS IMPASSABLE AND HAD EMERGENCY VEHICLES BLOCKING THE ENTRANCE.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Midland Regional, TX (KMAF), launched 12:00Z, 0.3 hours before the alert went out and 164 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: 524 J/kg
Mixed-layer CIN: -47 J/kg
Mixed-layer LCL: 1034 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: 5 m²/s²
0-3 km storm-relative helicity: 63 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

199 
WGUS54 KSJT 151216
FFWSJT
TXC235-451-151415-
/O.NEW.KSJT.FF.W.0025.210815T1216Z-210815T1415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service San Angelo TX
716 AM CDT Sun Aug 15 2021

The National Weather Service in San Angelo has issued a

* Flash Flood Warning for...
  Eastern Irion County in west central Texas...
  Southeastern Tom Green County in west central Texas...

* Until 915 AM CDT.

* At 716 AM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Flash flooding is already 
  occurring.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar.

  IMPACT...Flash flooding of small creeks and streams, urban
           areas, highways, streets and underpasses as well as
           other poor drainage and low-lying areas.

* Some locations that will experience flash flooding include...
  San Angelo, Mertzon, Christoval, Knickerbocker, Tankersley, Twin 
  Buttes Reservoir, Lake Nasworthy, Sherwood, San Angelo State Park, 
  Arden, O.c. Fisher Reservoir, Goodfellow Air Force Base, Wall, 
  Vancourt and Us-67 Near The Irion-Tom Green County Line.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be aware of your surroundings and do not drive on flooded roads.

Please report observed flooding to local emergency services or law 
enforcement and request they pass this information to the National 
Weather Service when you can do so safely.

&&

LAT...LON 3114 10104 3146 10103 3150 10045 3135 10014
      3112 10024

FLASH FLOOD...RADAR INDICATED

$$

TP

1 follow-up statement

555 
WGUS74 KSJT 151415
FFSSJT

Flash Flood Statement
National Weather Service San Angelo TX
915 AM CDT Sun Aug 15 2021

TXC235-451-151425-
/O.EXP.KSJT.FF.W.0025.000000T0000Z-210815T1415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Irion TX-Tom Green TX-
915 AM CDT Sun Aug 15 2021

...FLASH FLOOD WARNING HAS EXPIRED FOR EASTERN IRION AND 
SOUTHEASTERN TOM GREEN COUNTIES...

Flood waters have receded. The heavy rain has ended. Flooding is no 
longer expected to pose a threat. Please continue to heed remaining 
road closures.

LAT...LON 3114 10104 3146 10103 3150 10045 3135 10014
      3112 10024

$$

TP

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 15, 3:34 AM CDT	Special Weather Statement	SJT	Runnels	41 min
Aug 15, 3:47 AM CDT	Severe Thunderstorm Warning Considerable damage threat	SJT	Coke, Runnels, Tom Green	21 min
Aug 15, 6:37 AM CDT	Areal Flood Advisory	SJT	Coke, Irion, Sterling, Tom Green	2 hr
Aug 15, 9:08 AM CDT	Areal Flood Advisory	SJT	Menard, Schleicher, Sutton	112 min
Aug 15, 5:42 PM CDT	Special Weather Statement	SJT	Coleman	33 min

Nearby

Flash Flood Warnings in Texas, 2021 Every flash flood warning in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.