Alert archive / Texas / Flash Flood Warnings in 2002

Flash Flood Warning 34, NWS Brownsville, TX

October 20, 2002Hidalgo County, Texas

NWS Brownsville, TX issued this flash flood warning at Oct 20, 2002, 9:35 PM CDT for Hidalgo 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 outline as issued.

The facts

Issued: Oct 20, 2002, 9:35 PM CDT (02:35 UTC)
Expired: Oct 21, 2002, 12:30 AM CDT
In force: 3 hr
Issued by: NWS Brownsville, TX
Area: Counties, with a storm outline in the text

County Hidalgo County, TX

The radar

The Brownsville radar (KBRO), 95 km from the middle of the area, began a volume at 02:34 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, 2.6 hours before the alert went out and 97 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: 2087 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 777 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 3 m²/s²
0-3 km storm-relative helicity: 33 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 2.6

Open this sounding in Storm Lab

The text

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

000 
WGUS54 KBRO 210235
FFWBRO
TXC215-210530-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BROWNSVILLE TX
930 PM CDT SUN OCT 20 2002

THE NATIONAL WEATHER SERVICE IN BROWNSVILLE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  HIDALGO COUNTY IN DEEP SOUTH TEXAS

* UNTIL 1230 AM CDT

* AT 922 PM CDT...SPOTTERS REPORTED THUNDERSTORMS WITH VERY          
  HEAVY RAINFALL HAVE CAUSED FLOODING IN SOUTHERN HIDALGO            
  COUNTY...ESPECIALLY NEAR PROGRESO. THUNDERSTORMS CONTINUE TO       
  REDEVELOP OVER SOUTHERN HIDALGO COUNTY...AND THIS WILL CAUSE       
  ADDITIONAL FLOOD PROBLEMS.

* SLOW MOVING THUNDERSTORMS ARE PRODUCING TORRENTIAL RAINFALL IN THE
  WARNED AREA. RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH
  FLOODING TO OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLASH
  FLOODING INCLUDE...MCCOOK AND EDINBURG.

LAT...LON 2616 9864 2591 9790 2636 9789 2666 9839

PHILO

1 follow-up statement

000 
WGUS74 KBRO 210411
FFSBRO
TXC215-210530-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BROWNSVILLE TX
1110 PM CDT SUN OCT 20 2002

...A FLASH FLOOD WARNING REMAINS IN EFFECT FOR WILLACY COUNTY UNTIL 
MIDNIGHT...
...A FLASH FLOOD WARNING IS IN EFFECT FOR HIDALGO COUNTY UNTIL 1230 
AM MONDAY...

AT 1100 PM CDT...THUNDERSTORMS CONTINUE TO TRAVERSE BROOKS AND 
KENEDY COUNTIES...EAST OF A LINE FROM EDINBURG TO FALFURRIAS.
MOVEMENT IS NORTHEAST AT 20 MPH. RAINS CONTINUE TO STREAM ACROSS 
ADJACENT MEXICO...SOUTH OF THE RIO GRANDE RIVER. SOME AREAS ALONG 
THE RIO GRANDE MAY RECEIVE A SHOWER WITH AN EMBEDDED THUNDERSTORM 
DURING THE NEXT HOUR OR TWO. NO SEVERE THUNDERSTORM WARNINGS 
ARE CURRENTLY IN EFFECT IN THE RIO GRANDE VALLEY.

EXPECT HEAVY RAINS...FREQUENT LIGHTNING AND STRONG...GUSTY WINDS 
WITH ANY THUNDERSTORMS TONIGHT. THE ATMOSPHERE REMAINS MOIST AND 
UNSTABLE OVER MOST OF DEEP SOUTH TEXAS. 

DRIVE WITH CARE...AND REMAIN WEATHER ALERT. REMEMBER...FLASH FLOOD 
WARNINGS REMAIN IN EFFECT FOR WILLACY AND HIDALGO COUNTIES.

PHILO

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 20, 7:23 PM CDT	Severe Thunderstorm Warning	BRO	Cameron	82 min
Oct 20, 8:00 PM CDT	Severe Thunderstorm Warning	BRO	Hidalgo	90 min
Oct 20, 8:44 PM CDT	Severe Thunderstorm Warning	BRO	Hidalgo, Willacy	44 hr
Oct 20, 9:05 PM CDT	Flash Flood Warning	BRO	Willacy	3 hr

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.