Alert archive / Texas / Flash Flood Warnings in 2004

Flash Flood Warning 2, NWS Shreveport, LA

March 29, 2004Nacogdoches County, Texas

NWS Shreveport, LA issued this flash flood warning at Mar 29, 2004, 2:20 AM CST for Nacogdoches County, Texas. It was in force for 4 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: Mar 29, 2004, 2:20 AM CST (08:20 UTC)
Expired: Mar 29, 2004, 6:15 AM CST
In force: 4 hr
Issued by: NWS Shreveport, LA
Area: Counties, with a storm outline in the text

County Nacogdoches County, TX

The radar

The Shreveport radar (KSHV), 121 km from the middle of the area, began a volume at 08:24 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

Shreveport, LA (KSHV), launched 00:00Z, 8.3 hours before the alert went out and 130 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: 578 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 1210 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 46 m²/s²
0-3 km storm-relative helicity: 89 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 2.0

Open this sounding in Storm Lab

The text

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

000 
WGUS54 KSHV 290827
FFWSHV
TXC347-291215-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
220 AM CST MON MAR 29 2004

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NACOGDOCHES COUNTY IN EASTERN TEXAS

* UNTIL 615 AM CST

* AT 210 AM CST...SHREVEPORT NATIONAL WEATHER SERVICE DOPPLER RADAR  
  INDICATED BETWEEN ONE AND TWO INCHES OF RAIN HAS ALREADY           
  FALLEN...WITH MORE HEAVY RAIN EXPECTED AS THUNDERSTORMS CONTINUE   
  TO MOVE OVER THE SAME AREAS.

* STORMS PRODUCING HEAVY RAIN WILL CONTINUE TO AFFECT MUCH OF        
  NACOGDOCHES COUNTY...INCLUDING DOUGLASS...MELROSE...AND            
  NACOGDOCHES. 

ADDITIONAL RAINFALL AMOUNTS OF ONE TO TWO INCHES ARE POSSIBLE BEFORE 
THE RAIN ENDS.

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.

REPEATING...THE NATIONAL WEATHER SERVICE HAS ISSUED A FLASH FLOOD 
WARNING FOR...
  NACOGDOCHES COUNTY IN EASTERN TEXAS
UNTIL 615 AM CST.

LAT...LON 3174 9491 3153 9480 3143 9439 3172 9445

$$

1 follow-up statement

000 
WGUS74 KSHV 291149
FFSSHV
TXC347-291215-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
545 AM CST MON MAR 29 2004

...FLASH FLOOD WARNING CONTINUES FOR NACOGDOCHES COUNTY IN EASTERN
TEXAS...UNTIL 615 AM CST...

AT 540 AM...NATIONAL WEATHER SERVICE DOPPLER RADAR IN SHREVEPORT...
CONTINUED TO INDICATE ADDITIONAL SHOWERS AND ISOLATED THUNDERSTORMS
MOVING EAST INTO NACOGDOCHES COUNTY FROM SOUTHERN CHEROKEE AND
NORTHERN ANGELINA COUNTIES. RADAR ESTIMATES OF TWO TO THREE INCHES
HAVE BEEN COMMON ACROSS OVER THE WESTERN AND SOUTHERN PORTIONS OF THE
COUNTY...WITH A CONFIRMED REPORT NEAR TWO AND A HALF INCHES WHICH
FELL AT THE NACOGDOCHES COUNTY AIRPORT.  RADAR ALSO ESTIMATES THAT
ISOLATED AMOUNTS OF UP TO FOUR INCHES ARE POSSIBLE...ESPECIALLY ALONG
HIGHWAY 21 NEAR THE DOUGLASS COMMUNITY. ADDITIONAL RAINFALL AMOUNTS
OF UP TO A HALF AN INCH WILL BE POSSIBLE DURING THE NEXT HOUR OR
SO...BEFORE THE RAIN BEGINS TO TAPER OFF LATER THIS MORNING.

MOST FLASH FLOOD DEATHS OCCUR AT NIGHT.  BE ESPECIALLY CAUTIOUS AT
NIGHT SINCE IT IS HARDER TO RECOGNIZE THE DANGERS OF FLASH FLOODS.
USE CAUTION IN AND AROUND STREAMS...CREEKS OR DRAINAGE DITCHES.
TAKE THE SHORTEST PATH TO REACH HIGHER GROUND...BUT DO NOT DRIVE
THROUGH RISING WATER.

$$

15

Nearby

Flash Flood Warnings in Texas, 2004 Every flash flood warning in 2004

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.