Alert archive / Texas / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 138, NWS Austin/San Antonio, TX
NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Apr 8, 1998, 2:57 AM CDT for Gillespie County, Llano County, Texas. It was in force for 2 hr. 4 reports 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
- Apr 8, 1998, 2:57 AM CDT (07:57 UTC)
- Expired
- Apr 8, 1998, 5:00 AM CDT
- In force
- 2 hr
- Issued by
- NWS Austin/San Antonio, TX
- Area
- Whole counties
Counties Gillespie County, TX, Llano County, TX
The radar
The Austin/San Antonio radar (KEWX), 117 km from the middle of the area, began a volume at 07:58 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 8, 3:20 AM CDT | Hail 0.75 | Llano, TX | |
| Apr 8, 3:25 AM CDT | Thunderstorm Wind | Llano, TX | |
| Apr 8, 3:42 AM CDT | Hail 1.75 | Kingsland, TX | |
| Apr 8, 4:15 AM CDT | Thunderstorm Wind | Fredericksburg, 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 |
|---|---|---|---|
| Apr 8, 1:30 AM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Del Rio, TX (KDRT), launched 00:00Z, 8.0 hours before the alert went out and 233 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
- 1085 J/kg
- Mixed-layer CIN
- -43 J/kg
- Mixed-layer LCL
- 1551 m above ground
- 0-6 km bulk shear
- 79 kt
- 0-1 km storm-relative helicity
- 26 m²/s²
- 0-3 km storm-relative helicity
- 162 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 3.8
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KSAT 080807 RRA SVRSAT TXC171-299-081000- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING...CORRECTED FOR TIME NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 257 AM CDT WED APR 8 1998 THE NATIONAL WEATHER SERVICE IN AUSTIN/SAN ANTONIO HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 500 AM CDT FOR PEOPLE IN THE FOLLOWING LOCATIONS... IN SOUTH CENTRAL TEXAS ...GILLESPIE COUNTY...LLANO COUNTY SEVERE THUNDERSTORMS ARE MOVING INTO GILLESPIE COUNTY AND LLANO COUNTY. THESE STORMS HAVE A HISTORY OF PRODUCING ONE INCH DIAMETER HAIL NEAR JUNCTION. THE STORMS ARE MOVING EAST NORTHEAST AT 35 MPH. SEVERE THUNDERSTORM WINDS CAN REACH SPEEDS OVER 60 MPH. THESE WINDS BLOW DOWN^ TREES...POWER LINES...AND SEVERELY DAMAGE MOBILE HOMES... SOMETIMES BUILDINGS. VERY LARGE HAIL CAN INJURE ANYONE CAUGHT OUTSIDE. &
The office that day
Everything else NWS Austin/San Antonio, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 8, 3:28 AM CDT | Severe Thunderstorm Warning | EWX | Burnet | 62 min |
| Apr 8, 3:46 AM CDT | Severe Thunderstorm Warning | EWX | Travis, Williamson | 59 min |
| Apr 8, 4:11 AM CDT | Severe Thunderstorm Warning | EWX | Blanco | 64 min |
| Apr 8, 4:30 AM CDT | Severe Thunderstorm Warning | EWX | Comal, Hays | 60 min |
| Apr 8, 4:45 AM CDT | Tornado Warning | EWX | Hays, Travis | 60 min |
Nearby
Severe Thunderstorm Warnings in Texas, 1998Every severe thunderstorm warning in 1998
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.