Alert archive / Texas / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 7, NWS Corpus Christi, TX

March 12, 1999La Salle County, Webb County, Texas

NWS Corpus Christi, TX issued this severe thunderstorm warning at Mar 12, 1999, 11:28 PM CST for La Salle County, Webb County, Texas. It was in force for 62 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, 11:28 PM CST (05:28 UTC)
Expired
Mar 13, 1999, 12:30 AM CST
In force
62 min
Issued by
NWS Corpus Christi, TX
Area
Whole counties; the outline is the Mesonet’s reconstruction

Counties La Salle County, TX, Webb County, TX

The radar

The Corpus Christi radar (KCRP), 170 km from the middle of the area, began a volume at 05:31 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, 5.5 hours before the alert went out and 216 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 00:00Z on 1999-03-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 741 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 00:00Z on 1999-03-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 151 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
741 J/kg
Mixed-layer CIN
-142 J/kg
Mixed-layer LCL
1309 m above ground
0-6 km bulk shear
86 kt
0-1 km storm-relative helicity
151 m²/s²
0-3 km storm-relative helicity
473 m²/s²
Significant tornado parameter
0.6
Supercell composite
11.0

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 Corpus Christi, TX issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 12, 7:15 PM CSTSevere Thunderstorm WarningCRPLa Salle, McMullen60 min
Mar 12, 9:41 PM CSTSevere Thunderstorm WarningCRPLa Salle49 min
Mar 12, 10:25 PM CSTSevere Thunderstorm WarningCRPLa Salle, McMullen65 min
Mar 12, 11:28 PM CSTSevere Thunderstorm WarningCRPDuval, Live Oak, McMullen62 min
Mar 13, 12:26 AM CSTSevere Thunderstorm WarningCRPDuval64 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.