Alert archive / Texas / Flash Flood Warnings in 2021

Flash Flood Warning 1, NWS Brownsville, TX

May 15, 2021Hidalgo County, Texas

NWS Brownsville, TX issued this flash flood warning at May 15, 2021, 1:12 PM CDT for Hidalgo County, Texas. It was in force for 49 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: May 15, 2021, 1:12 PM CDT (18:12 UTC)
Expired: May 15, 2021, 2:01 PM CDT
In force: 49 min
Issued by: NWS Brownsville, TX
Area: Storm-based polygon
Flood severity: None

County Hidalgo County, TX

The radar

The Brownsville radar (KBRO), 98 km from the middle of the area, began a volume at 18:12 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

Brownsville Intl, TX (KBRO), launched 12:00Z, 6.2 hours before the alert went out and 100 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: 1407 J/kg
Mixed-layer CIN: -11 J/kg
Mixed-layer LCL: 634 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 57 m²/s²
0-3 km storm-relative helicity: 118 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 3.0

Open this sounding in Storm Lab

The text

As transmitted.

539 
WGUS54 KBRO 151812
FFWBRO
TXC215-151915-
/O.NEW.KBRO.FF.W.0001.210515T1812Z-210515T1915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Brownsville TX
112 PM CDT Sat May 15 2021

The National Weather Service in Brownsville has issued a

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

* Until 215 PM CDT.

* At 112 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 2 and 4 inches of rain 
  have fallen. The expected rainfall rate is 1 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...
  Mission, Palmview, Penitas, Palmhurst, North McAllen, Sharyland, 
  South McAllen, Alton, Josefa Garcia Park, Sylvia Vela Park, 
  Olivero Garza Sr Elementary School, Alton Memorial Junior High 
  School, Sharyland North Junior High School, Donna Wernecke 
  Elementary School, West Sharyland, Veterans Memorial High School, 
  Hendricks Elementary School, Mcallen Recycling Center, La Homa and 
  Palmview High School.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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 2632 9842 2645 9830 2639 9813 2609 9827
      2610 9829 2611 9827 2612 9827 2612 9830
      2610 9831 2614 9833 2617 9834 2615 9835
      2617 9836 2616 9837 2616 9839 2618 9841
      2620 9844 2622 9844 2623 9846 2620 9848

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

$$

Castillo

1 follow-up statement

200 
WGUS74 KBRO 151901
FFSBRO

Flash Flood Statement
National Weather Service Brownsville TX
201 PM CDT Sat May 15 2021

TXC215-151911-
/O.CAN.KBRO.FF.W.0001.000000T0000Z-210515T1915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Hidalgo TX-
201 PM CDT Sat May 15 2021

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

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

LAT...LON 2632 9842 2645 9830 2639 9813 2609 9827
      2610 9829 2611 9827 2612 9827 2612 9830
      2610 9831 2614 9833 2617 9834 2615 9835
      2617 9836 2616 9837 2616 9839 2618 9841
      2620 9844 2622 9844 2623 9846 2620 9848

$$

Castillo

The office that day

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

Issued	Product	Office	Counties	Lasted
May 15, 10:56 AM CDT	Special Weather Statement	BRO	Hidalgo	49 min
May 15, 11:25 AM CDT	Special Weather Statement	BRO	Hidalgo	50 min
May 15, 11:39 AM CDT	Areal Flood Advisory	BRO	Hidalgo	51 min
May 15, 12:14 PM CDT	Special Weather Statement	BRO	Hidalgo, Starr	46 min
May 15, 12:22 PM CDT	Tornado Warning	BRO	Hidalgo	8 min
May 15, 12:23 PM CDT	Areal Flood Advisory	BRO	Hidalgo	112 min
May 15, 12:28 PM CDT	Tornado Warning	BRO	Hidalgo	17 min
May 15, 12:41 PM CDT	Severe Thunderstorm Warning	BRO	Cameron, Hidalgo	49 min
May 15, 12:48 PM CDT	Areal Flood Advisory	BRO	Hidalgo, Starr	75 min
May 15, 1:02 PM CDT	Severe Thunderstorm Warning	BRO	Cameron, Hidalgo, Willacy	28 min
May 15, 1:26 PM CDT	Severe Thunderstorm Warning	BRO	Cameron, Hidalgo, Willacy	28 min
May 15, 1:30 PM CDT	Tornado Warning	BRO	Hidalgo, Willacy	15 min
May 15, 1:53 PM CDT	Areal Flood Advisory	BRO	Cameron, Hidalgo, Willacy	52 min
May 15, 2:01 PM CDT	Special Weather Statement	BRO	Cameron, Willacy	29 min
May 15, 2:23 PM CDT	Special Marine Warning	BRO		97 min
May 15, 2:29 PM CDT	Special Weather Statement	BRO	Cameron	46 min
May 15, 2:37 PM CDT	Areal Flood Advisory	BRO	Cameron, Hidalgo, Willacy	53 min
May 15, 3:15 PM CDT	Special Weather Statement	BRO	Cameron	30 min
May 15, 3:22 PM CDT	Special Weather Statement	BRO	Cameron	38 min
May 15, 3:25 PM CDT	Areal Flood Advisory	BRO	Cameron, Willacy	65 min
May 15, 5:20 PM CDT	Special Marine Warning	BRO		25 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.