Alert archive / Texas / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 18, NWS Austin/San Antonio, TX

March 12, 1999Edwards County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Mar 12, 1999, 1:15 PM CST for Edwards 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
Mar 12, 1999, 1:15 PM CST (19:15 UTC)
Expired
Mar 12, 1999, 2:15 PM CST
In force
60 min
Issued by
NWS Austin/San Antonio, TX
Area
Whole counties

County Edwards County, TX

The nearest sounding before it

Del Rio, TX (KDRT), launched 12:00Z, 7.3 hours before the alert went out and 86 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 1999-03-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2301 joules per kilogram.LCLEL10008507005003002001001 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 1999-03-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 207 square meters per square second.1939587897Sfc1 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
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

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
Mar 12, 11:09 AM CSTSevere Thunderstorm WarningEWXBurnet, Williamson41 min
Mar 12, 12:34 PM CSTSevere Thunderstorm WarningEWXVal Verde61 min
Mar 12, 12:39 PM CSTSevere Thunderstorm WarningEWXBurnet46 min
Mar 12, 1:47 PM CSTTornado WarningEWXEdwards, Val Verde63 min
Mar 12, 2:50 PM CSTSevere Thunderstorm WarningEWXEdwards, Kinney, Real, Val Verde60 min
Mar 12, 3:39 PM CSTSevere Thunderstorm WarningEWXBurnet61 min
Mar 12, 3:53 PM CSTTornado WarningEWXKinney42 min
Mar 12, 4:03 PM CSTSevere Thunderstorm WarningEWXLlano62 min
Mar 12, 4:17 PM CSTSevere Thunderstorm WarningEWXUvalde58 min
Mar 12, 4:45 PM CSTSevere Thunderstorm WarningEWXBurnet60 min
Mar 12, 5:16 PM CSTSevere Thunderstorm WarningEWXUvalde59 min
Mar 12, 5:21 PM CSTTornado WarningEWXBurnet, Travis64 min
Mar 12, 5:35 PM CSTTornado WarningEWXMedina, Uvalde60 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.