Alert archive / Texas / Flash Flood Warnings in 2002

Flash Flood Warning 4, NWS Brownsville, TX

June 30, 2002Cameron County, Texas

NWS Brownsville, TX issued this flash flood warning at Jun 30, 2002, 11:20 PM CDT for Cameron County, Texas. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jun 30, 2002, 11:20 PM CDT (04:20 UTC)
Expired: Jul 1, 2002, 2:15 AM CDT
In force: 3 hr
Issued by: NWS Brownsville, TX
Area: Whole counties

County Cameron County, TX

The radar

The Brownsville radar (KBRO), 27 km from the middle of the area, began a volume at 04:20 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

Brownsville Intl, TX (KBRO), launched 00:00Z, 4.3 hours before the alert went out and 29 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: 3357 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 553 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 17 m²/s²
0-3 km storm-relative helicity: 63 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.9

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WGUS54 KBRO 010420
FFWBRO
TXC061-010715-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BROWNSVILLE TX
1115 PM CDT SUN JUN 30 2002

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WESTERN CAMERON COUNTY IN DEEP SOUTH TEXAS

* UNTIL 215 AM CDT

* AT 1108 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED  
  THUNDERSTORMS WITH VERY HEAVY RAINFALL 9 MILES SOUTHEAST OF LA     
  FERIA...MOVING NORTH AT 25 MPH.  DOPPLER RADAR ESTIMATED THAT      
  THESE THUNDERSTORMS ARE PRODUCING RAINFALL RATES UP TO 2 INCHES AN 
  HOUR OVER THE EXTREME WESTERN PORTION OF CAMERON COUNTY. 

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO   
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLASH FLOODING          
  INCLUDE...THE LA FERIA AND SANTA ROSA AREAS.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE 
DANGERS OF FLOODS AND FLASH FLOODS. IF FLASH FLOODING IS OBSERVED ACT
QUICKLY. MOVE UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY
IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

$$

LAT...LON 2598 9786 2599 9766 2632 9770 2634 9786

SPEECE

1 follow-up statement

000 
WGUS74 KBRO 010621
FFSBRO
TXC061-010700-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BROWNSVILLE TX
120 AM CDT MON JUL 1 2002

THE FLASH FLOOD WARNING FOR WESTERN CAMERON COUNTY EFFECTIVE UNTIL 215
AM CDT...HAS BEEN CANCELED.

HEAVY RAINFALL AND THUNDERSTORMS THAT MOVED ACROSS WESTERN CAMERON
COUNTY HAVE TRACKED INTO WESTERN WILLACY COUNTY. THE THUNDERSTORMS
ARE MOVING NORTH AT 20 TO 25 MPH.

NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATE ISOLATED RAINFALL
ESTIMATES OF ONE AND A HALF INCHES PER HOUR ACROSS WESTERN WILLACY
COUNTY. THESE RAINFALL AMOUNTS ARE SLIGHTLY BELOW THE FLASH FLOOD
ESTIMATES FOR THIS AREA.

EXCESSIVE RUNOFF FROM THESE STORMS WILL CAUSE TEMPORARY FLOODING OF
SMALL CREEKS AND STREAMS...HIGHWAYS AND UNDER PASSES.

$$

VANSPEYBROECK

Nearby

Flash Flood Warnings in Texas, 2002 Every flash flood warning in 2002

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.