Alert archive / Texas / Flash Flood Warnings in 2002

Flash Flood Warning 11, NWS Corpus Christi, TX

July 3, 2002La Salle County, McMullen County, Texas

NWS Corpus Christi, TX issued this flash flood warning at Jul 3, 2002, 1:34 AM CDT for La Salle County, McMullen 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: Jul 3, 2002, 1:34 AM CDT (06:34 UTC)
Expired: Jul 3, 2002, 4:30 AM CDT
In force: 3 hr
Issued by: NWS Corpus Christi, TX
Area: Counties, with a storm outline in the text

Counties La Salle County, TX, McMullen County, TX

The radar

The Corpus Christi radar (KCRP), 141 km from the middle of the area, began a volume at 06:35 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this flash flood warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Corpus Christi, TX (KCRP), launched 00:00Z, 6.6 hours before the alert went out and 158 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: 2124 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 880 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 76 m²/s²
0-3 km storm-relative helicity: 145 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 2.8

Open this sounding in Storm Lab

The text

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

000 
WGUS54 KCRP 030634
FFWCRP
TXC283-311-030930-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE CORPUS CHRISTI TX
133 AM CDT WED JUL 3 2002

THE NATIONAL WEATHER SERVICE IN CORPUS CHRISTI HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  LA SALLE COUNTY IN TEXAS
  MCMULLEN COUNTY IN TEXAS

* UNTIL 430 AM CDT

* AT 133 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
AN EXPANDING AREA OF SHOWERS AND THUNDERSTORMS WITH VERY HEAVY RAIN 
ACROSS LA SALLE AND MCMULLEN COUNTIES. THE SHOWERS AND THUNDERSTORMS 
WERE MOVING SLOWLY NORTH AT 10 MPH AND WILL BE CAPABLE OF PRODUCING 
SEVERAL INCHES OF ADDITIONAL RAIN WHICH WILL AGGRAVATE THE ALREADY 
SWOLLEN RIVERS AND CREEKS.

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.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY.
MOVE TO HIGHER GROUND.

LAT...LON 2863 9835 2806 9835 2804 9939 2863 9939

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Corpus Christi, TX wrote its last area forecast discussion before this flash flood warning went out at Jul 2, 9:25 PM CDT, 4 hours 9 minutes earlier.

Area forecast discussion, Jul 2, 9:25 PM CDT, 4 hours 9 minutes before

COASTAL BEND FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CORPUS CHRISTI TX
925 PM CDT TUE JUL 2 2002

KCRP 88D CONTINUES TO SHOW CONVECTION BACKBUILDING TO THE SOUTHWEST
TWDS THE NWRN ZONES.  MSAS INDICATED A BROAD AREA OF SFC MOISTURE
CONVERGENCE.  THIS BASIC TREND WAS INDICATED BY SOME OF THE PREV
MODELS...ESPECIALLY THE MESOETA.  THIS PART OF THE CWFA WL BE UNDER
THE GUN TNT AS VORTICITY ROTATES SWWD WITHIN THE VERY FAVORABLE
DIV/DIFL PATTERN.  WL PLACE THE HIGHEST POPS IN THE NWRN ZONES.  WL
MAINTAIN THE FFA FOR THE NRN AND FAR WESTERN ZONES.  MAY TAKE OUT A
FEW COUNTIES FOR THE ERN AREAS.  FURTHER EAST AND SOUTH...PCPN CHCS
WL DIMINISH QUITE RAPIDLY.  THE LATEST 00Z SOUNDINGS CONFIRM THIS
WITH PWS FINALLY DROPPING TO AROUND 1.6 INCHES.

MARINE...SFC WIND OVER THE BAYS HAS DECREASED JUST BELOW SCA
CRITERION AND EXPECT GRADUAL DECOUPLING OVERNIGHT THERE. WL FCST
SCEC CONDITIONS OVER THE BAYS WITH WIND DIMINISHING FURTHER TOWARD
MORNING. WL MAINTAIN SCEC OVR THE OFFSHORE WATERS OWING TO
CURRENT/EXPECTED SEA HEIGHTS/WIND. ALTHOUGH THE UPPER DISTURBANCE
WILL PROVIDE SUPPORT FOR PCPN MAINLY OVER THE LAND OVERNIGHT...LOCAL
FORCING/LOW CIN MAY CONTRIBUTE TO ISOLD CONVECTION OVER THE WATER.

MB...80
WC...87

.CRP...FLASH FLOOD WATCH TXZ229>234-239 THROUGH WED.

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 3, 4:36 AM CDT	Severe Thunderstorm Warning	CRP	Victoria	32 days
Jul 3, 4:37 AM CDT	Flash Flood Warning	CRP	La Salle, McMullen	3 hr
Jul 3, 7:30 AM CDT	Flash Flood Warning	CRP	La Salle, McMullen	4 hr
Jul 3, 2:48 PM CDT	Flash Flood Warning	CRP	La Salle	4 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.