Alert archive / Texas / Severe Thunderstorm Watches in 2005

Severe Thunderstorm Watch 342

May 28, 2005Natchitoches Parish, Sabine Parish, Vernon Parish, Louisiana; 5 counties in Texas

The Storm Prediction Center issued this severe thunderstorm watch at May 28, 2005, 6:25 PM CDT for Natchitoches Parish, Sabine Parish, Vernon Parish, Louisiana; 5 counties in Texas. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
May 28, 2005, 6:25 PM CDT (23:25 UTC)
Expired
May 29, 2005, 12:00 AM CDT
In force
6 hr
Issued by
the Storm Prediction Center

Counties Natchitoches Parish, LA, Sabine Parish, LA, Vernon Parish, LA, Angelina County, TX, Nacogdoches County, TX, Sabine County, TX, San Augustine County, TX, Shelby County, TX

The radar

The Shreveport radar (KSHV), 102 km from the middle of the area, began a volume at 23:24 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.

Warnings issued inside it

2 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
May 28, 7:38 PM CDTTornado WarningSHVAngelina67 min
May 28, 10:11 PM CDTSevere Thunderstorm WarningLCHVernon41 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 11.4 hours before the alert went out and 107 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, Shreveport, LA at 12:00Z on 2005-05-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 44 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, Shreveport, LA at 12:00Z on 2005-05-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 23 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
44 J/kg
Mixed-layer CIN
-212 J/kg
Mixed-layer LCL
1417 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
23 m²/s²
0-3 km storm-relative helicity
35 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 28, 1:25 AM CDTMesoscale DiscussionSPCBandera, Blanco, Burnet, Coryell, Edwards, Gillespie and 15 more3 hr
May 28, 2:00 AM CDTMesoscale DiscussionSPCCochran, Hockley, Lubbock, Terry, Yoakum2 hr
May 28, 3:57 PM CDTMesoscale DiscussionSPCAnderson, Bell, Brazos, Burleson, Burnet, Coryell and 16 more2 hr
May 28, 6:41 PM CDTMesoscale DiscussionSPCBandera, Bell, Blanco, Brown, Burnet, Coleman and 29 more2 hr

Nearby

Severe Thunderstorm Watches in Texas, 2005Severe Thunderstorm Watches in Louisiana, 2005Every severe thunderstorm watch in 2005

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.