Alert archive / Texas / Flash Flood Warnings in 2018

Flash Flood Warning 3, NWS Brownsville, TX

June 20, 2018Cameron County, Hidalgo County, Texas

NWS Brownsville, TX issued this flash flood warning at Jun 20, 2018, 4:32 AM CDT for Cameron County, Hidalgo County, Texas. It was in force for 118 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
Jun 20, 2018, 4:32 AM CDT (09:32 UTC)
Expired
Jun 20, 2018, 6:30 AM CDT
In force
118 min
Issued by
NWS Brownsville, TX
Area
Storm-based polygon
Flood severity
None

Counties Cameron County, TX, Hidalgo County, TX

The radar

The Brownsville radar (KBRO), 47 km from the middle of the area, began a volume at 09:30 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, 9.5 hours before the alert went out and 189 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, Corpus Christi, TX at 00:00Z on 2018-06-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 431 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, Corpus Christi, TX at 00:00Z on 2018-06-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -29 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
431 J/kg
Mixed-layer CIN
-10 J/kg
Mixed-layer LCL
705 m above ground
0-6 km bulk shear
5 kt
0-1 km storm-relative helicity
-29 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.

438 
WGUS54 KBRO 200932
FFWBRO
TXC061-215-201130-
/O.NEW.KBRO.FF.W.0003.180620T0932Z-180620T1130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Brownsville TX
432 AM CDT WED JUN 20 2018

The National Weather Service in Brownsville has issued a

* Flash Flood Warning for...
  Southeastern Hidalgo County in Deep South Texas...
  Northwestern Cameron County in Deep South Texas...

* Until 630 AM CDT.

* At 431 AM CDT, Doppler radar indicated thunderstorms producing
  heavy rain across the warned area. Between 5 and 7 inches of 
  rain have already fallen within the warned area. Flash flooding 
  is expected to begin shortly.

* Some locations that will experience flooding include...
  Harlingen, Weslaco, San Benito, Mercedes, La Feria, Progreso,
  Edcouch, Santa Rosa, Rio Hondo and La Villa.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Please report flooding to your local law enforcement agency when you
can do so safely.

A Flash Flood Warning means that flooding is imminent or occurring.
If you are in the warned area move to higher ground immediately.
Residents living along streams and creeks should take immediate
precautions to protect life and property.

&&

LAT...LON 2605 9781 2606 9782 2605 9783 2605 9786
      2607 9786 2606 9787 2607 9789 2606 9793
      2607 9793 2605 9794 2606 9795 2605 9797
      2607 9799 2636 9798 2630 9757 2608 9757
      2605 9779 2606 9780

$$

TOMASELLI
1 follow-up statement
595 
WGUS74 KBRO 201042
FFSBRO

Flash Flood Statement
National Weather Service Brownsville TX
542 AM CDT WED JUN 20 2018

TXC061-215-201130-
/O.CON.KBRO.FF.W.0003.000000T0000Z-180620T1130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Hidalgo TX-Cameron TX-
542 AM CDT WED JUN 20 2018

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 630 AM CDT FOR
SOUTHEASTERN HIDALGO AND NORTHWESTERN CAMERON COUNTIES...

At 540 AM CDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Up to 12 inches of rain have already 
fallen within the warned area. Flash flooding is expected to begin 
shortly if not in progress already.

Some locations that will experience flooding include...
Harlingen, Weslaco, San Benito, Mercedes, La Feria, Progreso,
Edcouch, Santa Rosa, Rio Hondo and La Villa.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Please report flooding to your local law enforcement agency when you
can do so safely.

A Flash Flood Warning means that flooding is imminent or occurring.
If you are in the warned area move to higher ground immediately.
Residents living along streams and creeks should take immediate
precautions to protect life and property.

&&

LAT...LON 2605 9781 2606 9782 2605 9783 2605 9786
      2607 9786 2606 9787 2607 9789 2606 9793
      2607 9793 2605 9794 2606 9795 2605 9797
      2607 9799 2636 9798 2630 9757 2608 9757
      2605 9779 2606 9780

$$

TOMASELLI

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 19, 8:53 PM CDTAreal Flood WarningBROBrooks3 hr
Jun 20, 12:04 AM CDTSpecial Marine WarningBRO41 min
Jun 20, 2:40 AM CDTAreal Flood AdvisoryBROWillacy2 hr
Jun 20, 3:05 AM CDTSpecial Marine WarningBRO55 min
Jun 20, 4:02 AM CDTAreal Flood AdvisoryBROCameron, Willacy118 min
Jun 20, 4:14 AM CDTTornado WarningBROCameron31 min
Jun 20, 4:22 AM CDTAreal Flood AdvisoryBROHidalgo83 min
Jun 20, 4:48 AM CDTFlash Flood WarningBROWillacy117 min
Jun 20, 5:11 AM CDTSpecial Weather StatementBROHidalgo49 min
Jun 20, 5:14 AM CDTTornado WarningBROCameron, Hidalgo46 min
Jun 20, 5:20 AM CDTFlash Flood Warning EmergencyBROHidalgo9 hr
Jun 20, 5:58 AM CDTSevere Thunderstorm WarningBROCameron, Willacy18 min
Jun 20, 6:27 AM CDTFlash Flood Warning EmergencyBROCameron, Hidalgo7 hr
Jun 20, 6:42 AM CDTFlash Flood WarningBROWillacy4 hr
Jun 20, 7:22 AM CDTFlash Flood WarningBROCameron4 hr
Jun 20, 10:01 AM CDTSpecial Marine WarningBRO119 min
Jun 20, 11:50 AM CDTSpecial Marine WarningBRO115 min
Jun 20, 1:29 PM CDTAreal Flood WarningBROCameron, Hidalgo36 hr
Jun 20, 1:47 PM CDTSpecial Marine WarningBRO118 min
Jun 20, 4:20 PM CDTFlash Flood WarningBROCameron, Willacy115 min
Jun 20, 6:04 PM CDTSpecial Marine WarningBRO116 min
Jun 20, 6:16 PM CDTFlash Flood WarningBROCameron119 min

Nearby

Flash Flood Warnings in Texas, 2018Every flash flood warning in 2018

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.