Alert archive / Texas / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 21, NWS Austin/San Antonio, TX
NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Mar 12, 1999, 4:03 PM CST for Llano County, Texas. It was in force for 62 min. 1 report came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Mar 12, 1999, 4:03 PM CST (22:03 UTC)
- Expired
- Mar 12, 1999, 5:05 PM CST
- In force
- 62 min
- Issued by
- NWS Austin/San Antonio, TX
- Area
- Whole counties
County Llano County, TX
The radar
The Ft Hood radar (KGRK), 124 km from the middle of the area, began a volume at 22:06 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 |
|---|---|---|---|
| Mar 12, 4:10 PM CST | Hail 1.75 | Tow, TX |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Mar 12, 10:45 AM CST | Tornado Watch | SPC | 6 hr |
| Mar 12, 3:45 PM CST | Tornado Watch | SPC | 5 hr |
The nearest sounding before it
Del Rio, TX (KDRT), launched 12:00Z, 10.1 hours before the alert went out and 255 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
- 2301 J/kg
- Mixed-layer CIN
- 0 J/kg
- Mixed-layer LCL
- 550 m above ground
- 0-6 km bulk shear
- 52 kt
- 0-1 km storm-relative helicity
- 207 m²/s²
- 0-3 km storm-relative helicity
- 328 m²/s²
- Significant tornado parameter
- 4.5
- Supercell composite
- 17.6
The text
As transmitted, in the capitals the NWS used until 2016.
999 WUUS1 KSAT 122201 RRA SVRSAT TXC299-122305- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 403 PM CST FRI MAR 12 1999 THE NATIONAL WEATHER SERVICE IN AUSTIN/SAN ANTONIO HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... LLANO IN TEXAS * UNTIL 505 PM CST * AT 400 PM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 10 MILES NORTH OF LLANO... MOVING EAST AT 20 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... TOW AT 420 PM DAMAGING WINDS AND LARGE HAIL ARE LIKELY. GO INSIDE A STURDY BUILDING AND STAY AWAY FROM WINDOWS MSF
The office that day
Everything else NWS Austin/San Antonio, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 12, 11:09 AM CST | Severe Thunderstorm Warning | EWX | Burnet, Williamson | 41 min |
| Mar 12, 12:34 PM CST | Severe Thunderstorm Warning | EWX | Val Verde | 61 min |
| Mar 12, 12:39 PM CST | Severe Thunderstorm Warning | EWX | Burnet | 46 min |
| Mar 12, 1:15 PM CST | Severe Thunderstorm Warning | EWX | Edwards | 60 min |
| Mar 12, 1:47 PM CST | Tornado Warning | EWX | Edwards, Val Verde | 63 min |
| Mar 12, 2:50 PM CST | Severe Thunderstorm Warning | EWX | Edwards, Kinney, Real, Val Verde | 60 min |
| Mar 12, 3:39 PM CST | Severe Thunderstorm Warning | EWX | Burnet | 61 min |
| Mar 12, 3:53 PM CST | Tornado Warning | EWX | Kinney | 42 min |
| Mar 12, 4:17 PM CST | Severe Thunderstorm Warning | EWX | Uvalde | 58 min |
| Mar 12, 4:45 PM CST | Severe Thunderstorm Warning | EWX | Burnet | 60 min |
| Mar 12, 5:16 PM CST | Severe Thunderstorm Warning | EWX | Uvalde | 59 min |
| Mar 12, 5:21 PM CST | Tornado Warning | EWX | Burnet, Travis | 64 min |
| Mar 12, 5:35 PM CST | Tornado Warning | EWX | Medina, Uvalde | 60 min |
Nearby
Severe Thunderstorm Warnings in Texas, 1999Every severe thunderstorm 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.