Alert archive / Texas / Flash Flood Warnings in 2009
Flash Flood Warning 4, NWS Austin/San Antonio, TX
NWS Austin/San Antonio, TX issued this flash flood warning at Apr 18, 2009, 11:45 AM CDT for DeWitt County, Gonzales County, Lavaca 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
- Apr 18, 2009, 11:45 AM CDT (16:45 UTC)
- Expired
- Apr 18, 2009, 2:45 PM CDT
- In force
- 3 hr
- Issued by
- NWS Austin/San Antonio, TX
- Area
- Storm-based polygon
- Flood severity
- None
Counties DeWitt County, TX, Gonzales County, TX, Lavaca County, TX
The radar
The Austin/San Antonio radar (KEWX), 93 km from the middle of the area, began a volume at 16:47 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 |
|---|---|---|---|
| Apr 18, 12:30 PM CDT | HEAVY RAIN 4.27 | 6 Nne Yoakum, TX | 4.27 INCHES OF RAINFALL IN THE PAST 5 HOURS ALONG WITH SOME MINOR FLOODING. |
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 12:00Z, 4.8 hours before the alert went out and 175 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.
- Mixed-layer CAPE
- 1763 J/kg
- Mixed-layer CIN
- -70 J/kg
- Mixed-layer LCL
- 486 m above ground
- 0-6 km bulk shear
- 46 kt
- 0-1 km storm-relative helicity
- 112 m²/s²
- 0-3 km storm-relative helicity
- 170 m²/s²
- Significant tornado parameter
- 1.4
- Supercell composite
- 8.4
The text
As transmitted, in the capitals the NWS used until 2016.
000
WGUS54 KEWX 181645
FFWEWX
TXC123-177-285-181945-
/O.NEW.KEWX.FF.W.0004.090418T1645Z-090418T1945Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1145 AM CDT SAT APR 18 2009
THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A
* FLASH FLOOD WARNING FOR...
DEWITT COUNTY...
GONZALES COUNTY...
LAVACA COUNTY...
* UNTIL 245 PM CDT.
* AT 1142 AM CDT...THE NATIONAL WEATHER SERVICE HAS DETERMINED THAT
RAINFALL ESTIMATES FROM DOPPLER RADAR INDICATE FLASH FLOODING FROM
THUNDERSTORMS OVER THE WARNED AREA. WIDESPREAD MODERATE TO HEAVY
RAINS CONTINUED ACROSS THE AREA. RAINFALL RATES OF 1 TO 2.5 INCHES
PER HOUR WERE NOTED. THIS WILL PROLONG THE THREAT OF FLASH
FLOODING AND WILL AGGRAVATE IT IN AREAS THAT SAW HEAVY RAINS ON
FRIDAY.
* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO WAELDER...
SUBLIME...SHINER...PALMETO...MOULTON...HALLETTSVILLE AND GONZALES.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
WHEN WATER COVERS THE ROAD...TURN AROUND DONT DROWN. THE LIFE YOU
SAVE MAY BE YOUR OWN.
&&
LAT...LON 2906 9694 2910 9698 2887 9730 2892 9743
2937 9784 2959 9764 2975 9734 2963 9716
2961 9685 2935 9657
$$3 follow-up statements
000
WGUS74 KEWX 181747
FFSEWX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1247 PM CDT SAT APR 18 2009
TXC123-177-285-181945-
/O.CON.KEWX.FF.W.0004.000000T0000Z-090418T1945Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GONZALES TX-LAVACA TX-DEWITT TX-
1247 PM CDT SAT APR 18 2009
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 245 PM CDT FOR
DEWITT...LAVACA AND GONZALES COUNTIES...
AT 1243 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO
DETECT THUNDERSTORMS PRODUCING FLASH FLOODING OVER THE WARNED AREA.
NUMEROUS SHOWERS AND THUNDERSTORMS WITH HEAVY RAIN CONTINUED ACROSS
MUCH OF DE WITT AND LAVACA COUNTIES WITH RAINFALL RATES OF 2 TO 3
INCHES PER HOUR. RAINFALL WAS SLOWLY DECREASING ACROSS GONZALES
COUNTY WITH RAINFALL RATES LESS THAN ONE INCH PER HOUR. THIS RAIN
WILL PROLONG THE THREAT OF FLASH FLOODING AND WILL AGGRAVATE IT IN
AREAS THAT SAW HEAVY RAINS FRIDAY AND LAST NIGHT.
LOCATIONS IN THE WARNING AREA INCLUDE WAELDER...SUBLIME...SHINER...
PALMETO...MOULTON...HALLETTSVILLE AND GONZALES.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
WHEN WATER COVERS THE ROAD...TURN AROUND DONT DROWN. THE LIFE YOU
SAVE MAY BE YOUR OWN.
&&
LAT...LON 2906 9694 2910 9698 2887 9730 2892 9743
2937 9784 2959 9764 2975 9734 2963 9716
2961 9685 2935 9657
$$000
WGUS74 KEWX 181854
FFSEWX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
154 PM CDT SAT APR 18 2009
TXC123-177-285-181945-
/O.CON.KEWX.FF.W.0004.000000T0000Z-090418T1945Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GONZALES TX-LAVACA TX-DEWITT TX-
154 PM CDT SAT APR 18 2009
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 245 PM CDT FOR
DEWITT...LAVACA AND GONZALES COUNTIES...
AT 150 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO
DETECT THUNDERSTORMS PRODUCING FLASH FLOODING OVER THE WARNED AREA.
HEAVY RAINS WERE NOTED BETWEEN YOAKUM...HALLETTSVILLE AND SPEAKS
WITH RAINFALL RATES OF 2 TO 3 INCHES PER HOUR. ELSEWHERE...PATCHY
LIGHT RAIN WITH RAINFALL RATES LESS THAN ONE TENTH INCH PER HOUR WAS
NOTED. THESE RAINS WILL CONTINUE TO AGGRAVATE THE FLOOD SITUATION.
LOCATIONS IN THE WARNING AREA INCLUDE WAELDER...SUBLIME...SHINER...
PALMETO...MOULTON...HALLETTSVILLE AND GONZALES.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
WHEN WATER COVERS THE ROAD...TURN AROUND DONT DROWN. THE LIFE YOU
SAVE MAY BE YOUR OWN.
&&
LAT...LON 2906 9694 2910 9698 2887 9730 2892 9743
2937 9784 2959 9764 2975 9734 2963 9716
2961 9685 2935 9657
$$000
WGUS74 KEWX 181948
FFSEWX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
248 PM CDT SAT APR 18 2009
TXC123-177-285-181956-
/O.EXP.KEWX.FF.W.0004.000000T0000Z-090418T1945Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GONZALES TX-LAVACA TX-DEWITT TX-
248 PM CDT SAT APR 18 2009
...THE FLASH FLOOD WARNING HAS EXPIRED FOR DEWITT...LAVACA AND
GONZALES COUNTIES...
AT 245 PM CDT...ONLY LIGHT RAIN WAS NOTED ACROSS THE AREA. THE
THREAT FOR NEW FLASH FLOODING HAS ENDED. AS A RESULT...THEN WARNING
WAS ALLOWED TO EXPIRE. HOWEVER...SOME STREAMS MAY CONTINUE TO SEE
RISES AND PONDING OF WATER IN LOW LYING AREAS CAN BE EXPECTED FOR
THE NEXT HOUR OR SO.
LAT...LON 2906 9694 2910 9698 2887 9730 2892 9743
2937 9784 2959 9764 2975 9734 2963 9716
2961 9685 2935 9657
$$The office that day
Everything else NWS Austin/San Antonio, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 17, 9:20 PM CDT | Flash Flood Watch | EWX | Atascosa, Bastrop, Bexar, Caldwell, Comal, DeWitt and 10 more | 19 hr |
| Apr 18, 3:03 AM CDT | Severe Thunderstorm Warning | EWX | Val Verde | 27 min |
| Apr 18, 3:45 AM CDT | Severe Thunderstorm Warning | EWX | Uvalde, Zavala | 60 min |
| Apr 18, 4:57 AM CDT | Areal Flood Advisory | EWX | Frio, Medina, Uvalde, Zavala | 2 hr |
| Apr 18, 5:11 AM CDT | Areal Flood Advisory | EWX | Atascosa, Caldwell, Gonzales, Guadalupe, Wilson | 2 hr |
| Apr 18, 5:46 AM CDT | Areal Flood Advisory | EWX | Bexar | 119 min |
| Apr 18, 5:49 AM CDT | Severe Thunderstorm Warning | EWX | Dimmit | 56 min |
| Apr 18, 6:45 AM CDT | Flash Flood Warning | EWX | Bastrop, Bexar, Caldwell, Fayette, Gonzales, Guadalupe and 2 more | 4 hr |
| Apr 18, 7:47 AM CDT | Flash Flood Warning | EWX | DeWitt, Fayette, Gonzales, Karnes, Lavaca, Lee and 1 more | 4 hr |
| Apr 18, 8:44 AM CDT | Severe Thunderstorm Warning | EWX | DeWitt, Lavaca | 29 min |
| Apr 18, 10:50 AM CDT | Areal Flood Advisory | EWX | Atascosa, Bastrop, Caldwell, Fayette, Gonzales, Guadalupe and 1 more | 115 min |
| Apr 18, 12:01 PM CDT | River Flood Warning | EWX | Caldwell, Gonzales | 24 hr |
| Apr 18, 4:13 PM CDT | River Flood Warning | EWX | DeWitt | 60 hr |
Nearby
Flash Flood Warnings in Texas, 2009Every flash flood warning in 2009
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.