Alert archive / Texas / Flash Flood Warnings in 2012
Flash Flood Warning 55, NWS Austin/San Antonio, TX
NWS Austin/San Antonio, TX issued this flash flood warning at Aug 18, 2012, 11:32 PM CDT for Bexar County, Texas. It was in force for 118 min. 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
- Aug 18, 2012, 11:32 PM CDT (04:32 UTC)
- Expired
- Aug 19, 2012, 1:30 AM CDT
- In force
- 118 min
- Issued by
- NWS Austin/San Antonio, TX
- Area
- Storm-based polygon
- Flood severity
- None
County Bexar County, TX
The radar
The Austin/San Antonio radar (KEWX), 44 km from the middle of the area, began a volume at 04:34 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 19, 1:00 AM CDT | FLASH FLOOD | 5 W China Grove, TX | ROAD CLOSURE DUE TO FLOODING. AMITY RD AT ROLAND AVE. |
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, 4.5 hours before the alert went out and 212 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
- 1435 J/kg
- Mixed-layer CIN
- -108 J/kg
- Mixed-layer LCL
- 1442 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 35 m²/s²
- 0-3 km storm-relative helicity
- 51 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 1.7
The text
As transmitted, in the capitals the NWS used until 2016.
736
WGUS54 KEWX 190432
FFWEWX
TXC029-190630-
/O.NEW.KEWX.FF.W.0055.120819T0432Z-120819T0630Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1132 PM CDT SAT AUG 18 2012
THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A
* FLASH FLOOD WARNING FOR...
EAST CENTRAL BEXAR COUNTY...
* UNTIL 130 AM CDT.
* AT 1130 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS HAVE
DETERMINED THAT RAINFALL ESTIMATES FROM DOPPLER RADAR INDICATE
HEAVY RAINS OF 2 TO 3 INCHES ACROSS EAST CENTRAL BEXAR COUNTY NEAR
MARTINEZ AND KIRBY. ADDITIONAL RAINFALL AMOUNTS NEAR ONE INCH
ARE POSSIBLE.
* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...SAN
ANTONIO...CHINA GROVE...KIRBY...OLMOS PARK...ST. HEDWIG AND TERRELL
HILLS.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
WHEN WATER COVERS THE ROAD...TURN AROUND DON'T DROWN. THE LIFE YOU
SAVE MAY BE YOUR OWN.
&&
LAT...LON 2951 9822 2943 9817 2934 9824 2930 9852
2936 9856 2948 9851
$$1 follow-up statement
039
WGUS74 KEWX 190604
FFSEWX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
104 AM CDT SUN AUG 19 2012
TXC029-190630-
/O.CON.KEWX.FF.W.0055.000000T0000Z-120819T0630Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BEXAR TX-
104 AM CDT SUN AUG 19 2012
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 130 AM CDT FOR EAST
CENTRAL BEXAR COUNTY...
AT 1255 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO
DETECT THUNDERSTORMS MOVING EASTWARD ACROSS THE WESTERN PART OF
BEXAR COUNTY AND EXPECT MODERATE TO HEAVY SHOWERS TO AFFECT THE SAN
ANTONIO AREA WITHIN THE NEXT 10 TO 20 MINUTES. ADDITIONAL RAINFALL
OF ONE HALF INCH POSSIBLE WITH NEW STORMS.
LOCATIONS IN THE WARNING AREA INCLUDE TERRELL HILLS AND OLMOS PARK.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
IT IS HARD TO RECOGNIZE THE DANGERS OF FLOODING AT NIGHT. IF FLOOD
WATERS RISE ACT QUICKLY. DO NOT STAY IN FLOOD PRONE AREAS.
&&
LAT...LON 2951 9822 2943 9817 2934 9824 2930 9852
2936 9856 2948 9851
$$The office that day
Everything else NWS Austin/San Antonio, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 18, 9:18 PM CDT | Areal Flood Advisory | EWX | Guadalupe | 2 hr |
| Aug 18, 10:01 PM CDT | Areal Flood Advisory | EWX | Williamson | 119 min |
| Aug 18, 10:14 PM CDT | Areal Flood Advisory | EWX | Bexar | 106 min |
| Aug 18, 10:28 PM CDT | Areal Flood Advisory | EWX | Travis | 2 hr |
| Aug 18, 10:45 PM CDT | Flash Flood Warning | EWX | Travis, Williamson | 105 min |
| Aug 18, 11:40 PM CDT | Areal Flood Advisory | EWX | Bastrop, Lee | 110 min |
| Aug 18, 11:50 PM CDT | Areal Flood Advisory | EWX | Caldwell, Gonzales, Guadalupe | 2 hr |
| Aug 19, 12:26 AM CDT | Areal Flood Advisory | EWX | Gillespie | 2 hr |
| Aug 19, 12:50 AM CDT | Areal Flood Advisory | EWX | Bandera, Frio, Medina, Uvalde, Zavala | 100 min |
| Aug 19, 1:16 AM CDT | Areal Flood Advisory | EWX | Fayette | 104 min |
| Aug 19, 1:30 AM CDT | Areal Flood Advisory | EWX | Bexar, Kendall | 2 hr |
| Aug 19, 2:00 AM CDT | Flash Flood Warning | EWX | Bexar | 3 hr |
| Aug 19, 2:56 AM CDT | Flash Flood Warning | EWX | Medina | 3 hr |
| Aug 19, 4:00 AM CDT | Areal Flood Advisory | EWX | Atascosa | 2 hr |
| Aug 19, 4:54 AM CDT | Areal Flood Advisory | EWX | Wilson | 2 hr |
| Aug 19, 5:12 AM CDT | Flash Flood Warning | EWX | Bexar | 3 hr |
| Aug 19, 5:40 AM CDT | Areal Flood Advisory | EWX | Zavala | 110 min |
| Aug 19, 8:33 AM CDT | Areal Flood Advisory | EWX | Bexar | 117 min |
| Aug 19, 10:25 AM CDT | River Flood Warning | EWX | Bexar | 69 min |
| Aug 19, 11:05 AM CDT | River Flood Warning | EWX | Bexar, Wilson | 22 hr |
Nearby
Flash Flood Warnings in Texas, 2012Every 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.