Alert archive / Texas / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 66, NWS Austin/San Antonio, TX

April 25, 1999Medina County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Apr 25, 1999, 2:45 PM CDT for Medina County, Texas. It was in force for 60 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Apr 25, 1999, 2:45 PM CDT (19:45 UTC)
Expired
Apr 25, 1999, 3:45 PM CDT
In force
60 min
Issued by
NWS Austin/San Antonio, TX
Area
Whole counties; the outline is the Mesonet’s reconstruction

County Medina County, TX

The radar

The Austin/San Antonio radar (KEWX), 112 km from the middle of the area, began a volume at 19:48 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 12:00Z, 7.8 hours before the alert went out and 168 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.

Skew-T log-pSkew-T log-p diagram, Del Rio, TX at 12:00Z on 1999-04-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1820 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Del Rio, TX at 12:00Z on 1999-04-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 118 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
1820 J/kg
Mixed-layer CIN
-72 J/kg
Mixed-layer LCL
528 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
118 m²/s²
0-3 km storm-relative helicity
282 m²/s²
Significant tornado parameter
0.0
Supercell composite
14.5

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

The office that day

Everything else NWS Austin/San Antonio, TX issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 24, 9:00 PM CDTSevere Thunderstorm WarningEWXVal Verde40 min
Apr 25, 2:21 AM CDTSevere Thunderstorm WarningEWXMaverick64 min
Apr 25, 2:54 AM CDTSevere Thunderstorm WarningEWXKinney61 min
Apr 25, 3:11 AM CDTSevere Thunderstorm WarningEWXUvalde, Zavala79 min
Apr 25, 5:03 AM CDTSevere Thunderstorm WarningEWXBexar62 min
Apr 25, 7:56 AM CDTSevere Thunderstorm WarningEWXEdwards64 min
Apr 25, 9:18 AM CDTSevere Thunderstorm WarningEWXEdwards62 min
Apr 25, 9:46 AM CDTFlash Flood WarningEWXEdwards, Real59 min
Apr 25, 10:40 AM CDTFlash Flood WarningEWXEdwards, Real2 hr
Apr 25, 11:11 AM CDTSevere Thunderstorm WarningEWXBandera, Uvalde49 min
Apr 25, 11:40 AM CDTFlash Flood WarningEWXKerr3 hr
Apr 25, 12:41 PM CDTFlash Flood WarningEWXReal2 hr
Apr 25, 2:03 PM CDTSevere Thunderstorm WarningEWXBandera47 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.