Alert archive / Texas / Flash Flood Warnings in 2021

Flash Flood Warning 37, NWS Brownsville, TX

August 3, 2021Zapata County, Texas

NWS Brownsville, TX issued this flash flood warning at Aug 3, 2021, 4:20 AM CDT for Zapata County, Texas. It was in force for 44 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 3, 2021, 4:20 AM CDT (09:20 UTC)
Expired: Aug 3, 2021, 5:04 AM CDT
In force: 44 min
Issued by: NWS Brownsville, TX
Area: Storm-based polygon
Flood severity: None

County Zapata County, TX

The radar

The Corpus Christi radar (KCRP), 199 km from the middle of the area, began a volume at 09:20 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

Corpus Christi, TX (KCRP), launched 00:00Z, 9.3 hours before the alert went out and 211 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: 2590 J/kg
Mixed-layer CIN: -28 J/kg
Mixed-layer LCL: 1057 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 10 m²/s²
0-3 km storm-relative helicity: 30 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

806 
WGUS54 KBRO 030920
FFWBRO
TXC505-031015-
/O.NEW.KBRO.FF.W.0037.210803T0920Z-210803T1015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Brownsville TX
420 AM CDT Tue Aug 3 2021

The National Weather Service in Brownsville has issued a

* Flash Flood Warning for...
  Southwestern Zapata County in deep south Texas...

* Until 515 AM CDT.

* At 420 AM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 2 and 3 inches of rain 
  have fallen. The expected rainfall rate is 2 to 3 inches in 1 
  hour. Additional rainfall amounts of 1 to 2 inches are possible in 
  the warned area. Flash flooding is ongoing or expected to begin 
  shortly.

  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...
  Zapata, Medina, Falcon Shores, Falcon Lake Estates, Zapata County 
  Public Library, Zapata County Fire Department, Siesta Shores, 
  Zapata Middle School, Zapata High School, Black Bass, 
  Zapata--Medina and Romeo T. Flores Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 2694 9926 2687 9920 2683 9923 2687 9928
      2691 9931

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...2-3 INCHES IN 1 HOUR

$$

Hallman

1 follow-up statement

079 
WGUS74 KBRO 031004
FFSBRO

Flash Flood Statement
National Weather Service Brownsville TX
504 AM CDT Tue Aug 3 2021

TXC505-031014-
/O.CAN.KBRO.FF.W.0037.000000T0000Z-210803T1015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Zapata TX-
504 AM CDT Tue Aug 3 2021

...FLASH FLOOD WARNING IS CANCELLED FOR SOUTHWESTERN ZAPATA COUNTY...

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

LAT...LON 2694 9926 2687 9920 2683 9923 2687 9928
      2691 9931

$$

Hallman

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 2, 11:03 PM CDT	Areal Flood Advisory	BRO	Starr	86 min
Aug 2, 11:19 PM CDT	Special Weather Statement	BRO	Starr	41 min
Aug 3, 1:02 AM CDT	Areal Flood Advisory	BRO	Hidalgo, Starr	103 min
Aug 3, 1:30 AM CDT	Special Weather Statement	BRO	Zapata	45 min
Aug 3, 1:45 AM CDT	Special Weather Statement	BRO	Hidalgo	45 min
Aug 3, 2:14 AM CDT	Special Weather Statement	BRO	Zapata	46 min
Aug 3, 2:16 AM CDT	Areal Flood Advisory	BRO	Zapata	4 hr
Aug 3, 2:22 AM CDT	Areal Flood Advisory	BRO	Hidalgo	73 min
Aug 3, 2:29 AM CDT	Special Weather Statement	BRO	Hidalgo	31 min
Aug 3, 2:59 AM CDT	Special Weather Statement	BRO	Zapata	46 min
Aug 3, 3:17 AM CDT	Flash Flood Warning	BRO	Zapata	105 min
Aug 3, 3:20 AM CDT	Areal Flood Advisory	BRO	Zapata	3 hr
Aug 3, 3:44 AM CDT	Special Weather Statement	BRO	Zapata	31 min
Aug 3, 4:30 AM CDT	Special Weather Statement	BRO	Zapata	30 min
Aug 3, 5:47 AM CDT	Special Weather Statement	BRO	Starr	43 min
Aug 3, 6:12 AM CDT	Areal Flood Advisory	BRO	Starr	2 hr
Aug 3, 6:13 AM CDT	Areal Flood Advisory	BRO	Hidalgo	2 hr
Aug 3, 2:05 PM CDT	Special Weather Statement	BRO	Starr	55 min
Aug 3, 4:33 PM CDT	Areal Flood Advisory	BRO	Brooks, Kenedy	57 min
Aug 3, 4:37 PM CDT	Special Weather Statement	BRO	Brooks	38 min
Aug 3, 4:43 PM CDT	Special Weather Statement	BRO	Kenedy	47 min
Aug 3, 5:15 PM CDT	Special Weather Statement	BRO	Jim Hogg	45 min
Aug 3, 6:14 PM CDT	Areal Flood Advisory	BRO	Cameron, Hidalgo	61 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.