Alert archive / Texas / Flash Flood Warnings in 2012
Flash Flood Warning 39, NWS Austin/San Antonio, TX
NWS Austin/San Antonio, TX issued this flash flood warning at May 11, 2012, 12:06 AM CDT for Bexar County, Comal 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
- May 11, 2012, 12:06 AM CDT (05:06 UTC)
- Expired
- May 11, 2012, 3:00 AM CDT
- In force
- 3 hr
- Issued by
- NWS Austin/San Antonio, TX
- Area
- Storm-based polygon
- Flood severity
- None
Counties Bexar County, TX, Comal County, TX
The radar
The Austin/San Antonio radar (KEWX), 32 km from the middle of the area, began a volume at 05:08 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 |
|---|---|---|---|
| May 11, 1:00 AM CDT | FLASH FLOOD | N San Antonio, TX | SEVERAL ROADS CLOSED IN AND AROUND SAN ANTONIO. |
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, 5.1 hours before the alert went out and 229 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
- 2214 J/kg
- Mixed-layer CIN
- -8 J/kg
- Mixed-layer LCL
- 636 m above ground
- 0-6 km bulk shear
- 54 kt
- 0-1 km storm-relative helicity
- 204 m²/s²
- 0-3 km storm-relative helicity
- 274 m²/s²
- Significant tornado parameter
- 3.4
- Supercell composite
- 14.5
The text
As transmitted, in the capitals the NWS used until 2016.
325
WGUS54 KEWX 110506
FFWEWX
TXC029-091-110800-
/O.NEW.KEWX.FF.W.0039.120511T0506Z-120511T0800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1206 AM CDT FRI MAY 11 2012
THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A
* FLASH FLOOD WARNING FOR...
BEXAR COUNTY...
COMAL COUNTY...
* UNTIL 300 AM CDT.
* AT 1201 AM CDT...FLASH FLOODING CONTINUES TO BE REPORTED
ACROSS MUCH OF BEXAR AND COMAL COUNTIES. NUMEROUS LOW WATER
CROSSINGS WILL REMAIN FLOODED OVER THE SAN ANTONIO METRO
AREA...AND SEVERAL ROADS WILL REMAIN CLOSED THROUGH AT LEAST
3 AM CDT.
* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
PORTIONS OF SAN ANTONIO INSIDE LOOP 410...AND PORTIONS OF COMAL
COUNTY EAST AND SOUTH OF CANYON DAM.
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 2925 9880 2970 9880 2976 9862 3004 9830
3003 9828 2984 9803 2976 9800 2968 9809
2959 9831 2956 9829 2955 9822 2949 9819
2948 9812 2945 9812 2911 9841
$$The office that day
Everything else NWS Austin/San Antonio, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 10, 7:21 PM CDT | Tornado Warning | EWX | Dimmit, Frio, Zavala | 24 min |
| May 10, 7:59 PM CDT | River Flood Warning | EWX | Kerr | 18 hr |
| May 10, 8:02 PM CDT | Flash Flood Warning | EWX | Hays, Travis, Williamson | 118 min |
| May 10, 8:26 PM CDT | Severe Thunderstorm Warning | EWX | Travis, Williamson | 49 min |
| May 10, 8:32 PM CDT | River Flood Warning | EWX | Val Verde | 30 hr |
| May 10, 8:34 PM CDT | Areal Flood Advisory | EWX | Bexar | 116 min |
| May 10, 9:10 PM CDT | Flash Flood Warning | EWX | Bexar, Comal, Guadalupe, Hays | 3 hr |
| May 10, 9:59 PM CDT | Areal Flood Advisory | EWX | Bastrop, Caldwell, Comal, Guadalupe, Hays, Lee and 2 more | 2 hr |
| May 10, 10:42 PM CDT | Flash Flood Warning | EWX | Bastrop, Caldwell, Guadalupe, Hays, Lee, Travis and 1 more | 4 hr |
| May 11, 2:37 AM CDT | Flash Flood Warning | EWX | Hays | 113 min |
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.