Alert archive / Texas / Flash Flood Warnings in 2021

Flash Flood Warning 34, NWS Brownsville, TX

July 21, 2021Cameron County, Texas

NWS Brownsville, TX issued this flash flood warning at Jul 21, 2021, 2:44 PM CDT for Cameron County, Texas. It was in force for 63 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
Jul 21, 2021, 2:44 PM CDT (19:44 UTC)
Expired
Jul 21, 2021, 3:47 PM CDT
In force
63 min
Issued by
NWS Brownsville, TX
Area
Storm-based polygon
Flood severity
None

County Cameron County, TX

The radar

The Brownsville radar (KBRO), 34 km from the middle of the area, began a volume at 19:47 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, 7.7 hours before the alert went out and 36 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, Brownsville Intl, TX at 12:00Z on 2021-07-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2566 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brownsville Intl, TX at 12:00Z on 2021-07-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 26 square meters per square second.1939Sfc1 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
2566 J/kg
Mixed-layer CIN
-8 J/kg
Mixed-layer LCL
692 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
26 m²/s²
0-3 km storm-relative helicity
47 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

138 
WGUS54 KBRO 211944
FFWBRO
TXC061-212130-
/O.NEW.KBRO.FF.W.0034.210721T1944Z-210721T2130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Brownsville TX
244 PM CDT Wed Jul 21 2021

The National Weather Service in Brownsville has issued a

* Flash Flood Warning for...
  Northwestern Cameron County in deep south Texas...

* Until 430 PM CDT.

* At 244 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 2 inches of rain 
  have fallen. The expected rainfall rate is 2 to 3 inches in 1 
  hour. Additional rainfall amounts of 2 to 3 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...
  Harlingen, San Benito, Rio Hondo, Palm Valley, La Paloma, 
  Brownsville, Primera, Combes, Treasure Hills Golf Club, Treasure 
  Hills Elementary School, Harlingen Soccer Complex, San Benito 
  Veterans Memorial Academy, Mccullough Park, Valley Baptist Medical 
  Center Harlingen, San Benito Police Department, South Texas 
  Academy Of Medical Technology, Harlingen Fire Department, 
  Harlingen Medical Center, San Benito High School and San Benito 
  Library.

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.

&&

LAT...LON 2603 9768 2617 9777 2628 9775 2631 9768
      2631 9763 2630 9753 2631 9753 2631 9752
      2627 9751 2623 9758 2600 9756 2602 9764
      2603 9764 2602 9765 2603 9766 2604 9766
      2603 9767

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

$$

Bogorad
1 follow-up statement
457 
WGUS74 KBRO 212047
FFSBRO

Flash Flood Statement
National Weather Service Brownsville TX
347 PM CDT Wed Jul 21 2021

TXC061-212057-
/O.CAN.KBRO.FF.W.0034.000000T0000Z-210721T2130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Cameron TX-
347 PM CDT Wed Jul 21 2021

...FLASH FLOOD WARNING FOR NORTHWESTERN CAMERON COUNTY HAS BEEN 
REPLACED WITH A FLOOD ADVISORY...

Flood waters have begun to recede as the heavy rain is moving out of 
the warned area. Flooding is no longer expected to pose a threat. 
Please continue to heed any road closures.

LAT...LON 2603 9768 2617 9777 2628 9775 2631 9768
      2631 9763 2630 9753 2631 9753 2631 9752
      2627 9751 2623 9758 2600 9756 2602 9764
      2603 9764 2602 9765 2603 9766 2604 9766
      2603 9767

$$

Bogorad

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 20, 7:26 PM CDTSevere Thunderstorm WarningBROHidalgo34 min
Jul 20, 7:56 PM CDTSevere Thunderstorm WarningBROHidalgo34 min
Jul 20, 8:03 PM CDTAreal Flood AdvisoryBROHidalgo57 min
Jul 21, 12:02 PM CDTSpecial Weather StatementBROCameron43 min
Jul 21, 12:28 PM CDTSpecial Weather StatementBROCameron47 min
Jul 21, 1:15 PM CDTSpecial Weather StatementBROStarr45 min
Jul 21, 1:16 PM CDTAreal Flood AdvisoryBROCameron119 min
Jul 21, 1:31 PM CDTSpecial Weather StatementBROStarr44 min
Jul 21, 1:48 PM CDTSpecial Weather StatementBROStarr42 min
Jul 21, 2:00 PM CDTSpecial Weather StatementBROHidalgo45 min
Jul 21, 2:05 PM CDTAreal Flood AdvisoryBROHidalgo115 min
Jul 21, 2:25 PM CDTSpecial Weather StatementBROStarr35 min
Jul 21, 2:37 PM CDTAreal Flood AdvisoryBROCameron7 min
Jul 21, 2:44 PM CDTSpecial Weather StatementBROHidalgo31 min
Jul 21, 2:56 PM CDTAreal Flood AdvisoryBROCameron, Hidalgo5 hr
Jul 21, 2:59 PM CDTSpecial Weather StatementBROStarr31 min
Jul 21, 3:22 PM CDTSpecial Weather StatementBROKenedy23 min
Jul 21, 3:39 PM CDTAreal Flood AdvisoryBROHidalgo111 min
Jul 21, 3:53 PM CDTAreal Flood AdvisoryBROHidalgo52 min
Jul 21, 4:15 PM CDTFlash Flood Warning Considerable damage threatBROHidalgo105 min
Jul 21, 4:27 PM CDTAreal Flood AdvisoryBROBrooks63 min
Jul 21, 4:40 PM CDTAreal Flood AdvisoryBROCameron110 min
Jul 21, 4:56 PM CDTSpecial Weather StatementBROCameron49 min
Jul 21, 5:31 PM CDTAreal Flood AdvisoryBROCameron89 min
Jul 21, 5:40 PM CDTSpecial Weather StatementBROCameron50 min

Nearby

Flash Flood Warnings in Texas, 2021Every 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.