Alert archive / Texas / Severe Thunderstorm Warnings in 2000
Severe Thunderstorm Warning 106, NWS Austin/San Antonio, TX
NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Apr 20, 2000, 4:09 AM CDT for Bexar County, Medina County, Texas. It was in force for 66 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.
The facts
- Issued
- Apr 20, 2000, 4:09 AM CDT (09:09 UTC)
- Expired
- Apr 20, 2000, 5:15 AM CDT
- In force
- 66 min
- Issued by
- NWS Austin/San Antonio, TX
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
Counties Bexar County, TX, Medina County, TX
The radar
The Austin/San Antonio radar (KEWX), 79 km from the middle of the area, began a volume at 09:11 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
Del Rio, TX (KDRT), launched 00:00Z, 9.2 hours before the alert went out and 197 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
- 3020 J/kg
- Mixed-layer CIN
- -172 J/kg
- Mixed-layer LCL
- 2227 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- -17 m²/s²
- 0-3 km storm-relative helicity
- 21 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.3
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS54 KEWX 200910 SVRSAT TXC029-325-201015- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 409 AM CDT THU APR 20 2000 THE NATIONAL WEATHER SERVICE IN AUSTIN/SAN ANTONIO HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR THE FOLLOWING COUNTIES IN TEXAS... MEDINA COUNTY BEXAR COUNTY * UNTIL 515 AM CDT * AT 409 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 6 MILES SOUTHWEST OF RIO MEDINA...OR ABOUT 7 MILES NORTHWEST OF CASTROVILLE...MOVING EAST AT 35 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... CASTROVILLE AROUND 415 AM CDT LACOSTE AROUND 420 AM CDT SEA WORLD AROUND 430 AM CDT LACKLAND AFB AROUND 440 AM CDT VERY LARGE HAIL IS POSSIBLE WITH THIS SEVERE THUNDERSTORM. IF YOU ARE IN THE PATH OF THE STORM...PUT YOUR CAR IN A GARAGE AND MOVE TO A SUBSTANTIAL SHELTER. .END/ LAT...LON 2954 9898 2928 9896 2930 9850 2973 9862
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Austin/San Antonio, TX wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 20, 3:00 AM CDT, 1 hour 9 minutes earlier.
Area forecast discussion, Apr 20, 3:00 AM CDT, 1 hour 9 minutes before
SOUTH CENTRAL TEXAS FORECAST DISCUSSION NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 300 AM CDT THU APR 20 2000 LARGE SCALE PATTERN SHOWS A SPLIT FLOW OFF THE WEST COAST WITH ONE STORM TRACK ACROSS CANADA AND ONE TRACK ACROSS THE CENTRAL U.S. THE SOUTHERN TRACK CONTAINS TWO SIGNIFICANT TROUGHS. THE FIRST TROUGH IS PASSING US BY TO THE NORTH TODAY AND TONIGHT. WHILE THE FIRST ONE RETREATS ANOTHER TROUGH WILL AFFECT THE AREA DURING THE EXTENDED PERIOD. FRIDAY WILL BE AN INBETWEEN DAY. CONVECTION ALONG THE COLD FRONT HAS BEEN DISSIPATING AS THE RAIN MOVES AWAY FROM ITS DYNAMIC SOURCE. BUT AS THE FRONT CROSSES THE AREA TODAY THERE SHOULD BE ENOUGH INSTABILITY FOR SLIGHT CHANCE POPS OVER THE CENTRAL AND EASTERN ZONES. SLIGHTLY COOLER BUT MUCH DRIER AIR WILL SPREAD ACROSS THE AREA BY TONIGHT BUT ABUNDANT SUNSHINE ON FRIDAY WILL SEE A RAPID RISE IN TEMPS AGAIN. RETURN FLOW AND LIFT FROM THE APPROACHING SECOND TROUGH SHOULD PROVIDE MORE CLOUDS BY SATURDAY. THIS SECOND TROUGH APPEARS TO BE A LITTLE FARTHER SOUTH THAN THE FIRST ONE SO WE MAY SEE A LITTLE BETTER CHANCE OF PRECIP BY SUNDAY...BEFORE IT PASSES US BY ON MONDAY. WILL SEE IF THIS SCENARIO NEEDS ADJUSTING WHEN THE NEW MRF ARRIVES. PRELIMS... AUS 86/52/84/55 2000 SAT 88/56/87/60 1000 DRT 92/60/87/62 0000 .EWX...NONE. 16/18
Nearby
Severe Thunderstorm Warnings in Texas, 2000Every severe thunderstorm warning in 2000
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.