Alert archive / Texas / Flash Flood Warnings in 1999
Flash Flood Warning 22, NWS Austin/San Antonio, TX
NWS Austin/San Antonio, TX issued this flash flood warning at May 10, 1999, 4:50 PM CDT for Williamson 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 counties it named.
The facts
- Issued
- May 10, 1999, 4:50 PM CDT (21:50 UTC)
- Expired
- May 10, 1999, 8:00 PM CDT
- In force
- 3 hr
- Issued by
- NWS Austin/San Antonio, TX
- Area
- Whole counties
County Williamson County, TX
The radar
The Ft Hood radar (KGRK), 22 km from the middle of the area, began a volume at 21:54 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
Fort Worth, TX (KFWD), launched 12:00Z, 9.8 hours before the alert went out and 245 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
- 8 J/kg
- Mixed-layer CIN
- -449 J/kg
- Mixed-layer LCL
- 927 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 126 m²/s²
- 0-3 km storm-relative helicity
- 276 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KSAT 102150 FFWSAT TXC491-110100- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 450 PM CDT MON MAY 10 1999 THE NATIONAL WEATHER SERVICE IN AUSTIN/SAN ANTONIO HAS ISSUED A * FLASH FLOOD WARNING FOR... WILLIAMSON COUNTY IN TEXAS * UNTIL 800 PM CDT * AT AT 450 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED SHOWERS AND THUNDERSTORMS WITH VERY HEAVY RAIN OVER WESTERN AND CENTRAL WILLIAMSON COUNTY MOVING AND DEVELOPING EASTWARD AT 15 MPH. * BETWEEN 2 AND 4 INCHES OF RAIN HAS FALLEN OVER WILLIAMSON COUNTY TODAY. ADDITIONAL RAINS WILL CAUSE RUNOFF INTO LOW LYING AREAS AND LOW WATER CROSSINGS. DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD! EXTREME CAUTION SHOULD BE USED AT LOW WATER CROSSINGS OR OTHER LOW LYING AREAS.
The office that day
Everything else NWS Austin/San Antonio, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 9, 11:07 PM CDT | Severe Thunderstorm Warning | EWX | Edwards, Val Verde | 58 min |
| May 9, 11:58 PM CDT | Severe Thunderstorm Warning | EWX | Edwards | 62 min |
| May 10, 12:18 AM CDT | Tornado Warning | EWX | Edwards | 62 min |
| May 10, 12:25 AM CDT | Flash Flood Warning | EWX | Edwards | 3 hr |
| May 10, 12:56 AM CDT | Severe Thunderstorm Warning | EWX | Burnet, Llano | 59 min |
| May 10, 1:08 AM CDT | Severe Thunderstorm Warning | EWX | Edwards | 62 min |
| May 10, 10:02 AM CDT | Severe Thunderstorm Warning | EWX | Williamson | 58 min |
| May 10, 11:01 AM CDT | Severe Thunderstorm Warning | EWX | Williamson | 59 min |
| May 10, 1:37 PM CDT | Flash Flood Warning | EWX | Burnet, Llano | 3 hr |
| May 10, 2:08 PM CDT | Flash Flood Warning | EWX | Williamson | 2 hr |
| May 10, 2:40 PM CDT | Severe Thunderstorm Warning | EWX | Travis, Williamson | 65 min |
| May 10, 3:49 PM CDT | Severe Thunderstorm Warning | EWX | Lee | 56 min |
| May 10, 5:05 PM CDT | Severe Thunderstorm Warning | EWX | Travis, Williamson | 45 min |
| May 10, 6:57 PM CDT | Severe Thunderstorm Warning | EWX | Caldwell, Gonzales, Guadalupe | 48 min |
Nearby
Flash Flood Warnings in Texas, 1999Every flash flood warning in 1999
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.