Alert archive / Texas / Flash Flood Warnings in 2012

Flash Flood Warning 32, NWS Corpus Christi, TX

July 27, 2012Webb County, Texas

NWS Corpus Christi, TX issued this flash flood warning at Jul 27, 2012, 4:53 AM CDT for Webb County, Texas. It was in force for 3 hr. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jul 27, 2012, 4:53 AM CDT (09:53 UTC)
Expired: Jul 27, 2012, 7:45 AM CDT
In force: 3 hr
Issued by: NWS Corpus Christi, TX
Area: Storm-based polygon
Flood severity: None

County Webb County, TX

The radar

The Corpus Christi radar (KCRP), 200 km from the middle of the area, began a volume at 09:54 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.

What was reported inside it

Time	Report	Where	Remark
Jul 27, 5:00 AM CDT	FLASH FLOOD	5 Nne Laredo, TX	LAREDO FIRE CHIEF REPORTED FLASH FLOODING ACROSS NORTH LAREDO. PORTIONS OF INTERSTATE 35 IS CLOSED JUST NORTH OF LAREDO NEAR MILE MARKER 12 DUE TO DEBRIS BLOCKING THE ROADWAY. SEVERAL HIGH WATER RESCUES OCCURRED WITH MOTORISTS STRANDED IN HIGH WATER IN NORTHEA

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Corpus Christi, TX (KCRP), launched 00:00Z, 9.9 hours before the alert went out and 216 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: 1239 J/kg
Mixed-layer CIN: -71 J/kg
Mixed-layer LCL: 1213 m above ground
0-6 km bulk shear: 4 kt
0-1 km storm-relative helicity: 8 m²/s²
0-3 km storm-relative helicity: 9 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

419 
WGUS54 KCRP 270953
FFWCRP
TXC479-271245-
/O.NEW.KCRP.FF.W.0032.120727T0953Z-120727T1245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE CORPUS CHRISTI TX
453 AM CDT FRI JUL 27 2012

THE NATIONAL WEATHER SERVICE IN CORPUS CHRISTI HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL WEBB COUNTY IN SOUTH CENTRAL TEXAS...

* UNTIL 745 AM CDT

* AT 440 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED  
THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA.       
DOPPLER RADAR ESTIMATED BETWEEN 3 AND 6 INCHES OF RAINFALL HAS 
FALLEN ON THE FAR NORTH SIDE OF LAREDO AND RURAL AREAS TO THE NORTH. 
THE LAREDO FIRE DEPARTMENT REPORTS FLOODING BEGINNING IN SOME AREAS 
OF THE NORTH SIDE OF LAREDO...INCLUDING THE ISIDRIO SUBDIVISION. 
FLOODING IS ALSO BEING REPORTED IN LAS LOMAS. AN ADDITIONAL 1 TO 3 
INCHES IS POSSIBLE ACROSS THE CITY OF LAREDO AS WELL AS RURAL AREAS 
TO THE NORTH.

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLOODING TO OCCUR.  
SOME CITIES AND TOWNS THAT WILL EXPERIENCE FLOODING INCLUDE...  
LAREDO...AGUILARES...BOTINES...COLUMBIA BRIDGE...LAS LOMAS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW
LYING AREAS ARE SUBJECT TO FLOODING.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. 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 2744 9951 2749 9949 2749 9953 2756 9952
      2759 9954 2760 9959 2763 9961 2762 9966
      2765 9968 2765 9972 2769 9975 2785 9975
      2779 9899 2740 9906

$$

JR

1 follow-up statement

593 
WGUS74 KCRP 271106
FFSCRP

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE CORPUS CHRISTI TX
606 AM CDT FRI JUL 27 2012

TXC479-271245-
/O.CON.KCRP.FF.W.0032.000000T0000Z-120727T1245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WEBB-
INCLUDING THE CITY OF LAREDO
606 AM CDT FRI JUL 27 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 745 AM CDT FOR
CENTRAL WEBB COUNTY...

AT 554 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE FLASH FLOODING OVER THE WARNED AREA. DOPPLER RADAR 
ESTIMATED BETWEEN 4 AND 8 INCHES OF RAIN HAS FALLEN ALONG AN NORTH 
OF A LINE FROM THE COLUMBIA BRIDGE TO THE FAR NORTH SIDE OF LAREDO. 
AN ADDITIONAL 1/2 TO 1 INCH OF RAINFALL WILL BE POSSIBLE OVER THE 
WARNED AREA.

FLOODING HAS BEEN REPORTED IN SOME AREAS OF THE NORTH SIDE OF 
LAREDO...INCLUDING THE ISIDRIO SUBDIVISION. FLOODING IS ALSO BEING 
REPORTED IN LAS LOMAS. FLOODING WAS ALSO REPORTED ON THE EXIT RAMP 
OF INTERSTATE 35 AT MILE MARKER 12.

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLOODING TO OCCUR.  
SOME CITIES AND TOWNS THAT WILL EXPERIENCE FLOODING INCLUDE...  
LAREDO...AGUILARES...BOTINES...COLUMBIA BRIDGE...LAS LOMAS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW
LYING AREAS ARE SUBJECT TO FLOODING.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. 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 2744 9951 2749 9949 2749 9953 2756 9952
      2759 9954 2760 9959 2763 9961 2762 9966
      2765 9968 2765 9972 2769 9975 2785 9975
      2779 9899 2740 9906

$$

JR

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 27, 3:53 AM CDT	Areal Flood Advisory	CRP	Webb	82 min

Nearby

Flash Flood Warnings in Texas, 2012 Every flash flood warning in 2012

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.