Alert archive / Texas / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 25, NWS Brownsville, TX

September 28, 2013Zapata County, Texas

NWS Brownsville, TX issued this severe thunderstorm warning at Sep 28, 2013, 11:28 PM CDT for Zapata County, Texas. It was in force for 32 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
Sep 28, 2013, 11:28 PM CDT (04:28 UTC)
Expired
Sep 29, 2013, 12:00 AM CDT
In force
32 min
Issued by
NWS Brownsville, TX
Area
Storm-based polygon

County Zapata County, TX

The radar

The Corpus Christi radar (KCRP), 185 km from the middle of the area, began a volume at 04:29 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

Corpus Christi, TX (KCRP), launched 00:00Z, 4.5 hours before the alert went out and 198 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, Corpus Christi, TX at 00:00Z on 2013-09-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1515 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, Corpus Christi, TX at 00:00Z on 2013-09-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 21 square meters per square second.1939Sfc1 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
1515 J/kg
Mixed-layer CIN
-46 J/kg
Mixed-layer LCL
1102 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
21 m²/s²
0-3 km storm-relative helicity
40 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

Everything else NWS Brownsville, TX issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 28, 10:33 PM CDTAreal Flood AdvisoryBROZapata3 hr
Sep 28, 11:06 PM CDTSevere Thunderstorm WarningBROZapata24 min
Sep 29, 1:52 AM CDTAreal Flood AdvisoryBROStarr, Zapata83 min
Sep 29, 2:47 AM CDTAreal Flood AdvisoryBROStarr43 min
Sep 29, 2:57 AM CDTAreal Flood AdvisoryBROJim Hogg, Starr63 min
Sep 29, 8:26 AM CDTAreal Flood AdvisoryBROJim Hogg, Starr, Zapata2 hr

Nearby

Severe Thunderstorm Warnings in Texas, 2013Every severe thunderstorm warning in 2013

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.