Alert archive / Texas / Severe Thunderstorm Watches in 2015

Severe Thunderstorm Watch 237

May 28, 201522 counties in Texas

The Storm Prediction Center issued this severe thunderstorm watch at May 28, 2015, 7:58 PM CDT for 22 counties in Texas. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
May 28, 2015, 7:58 PM CDT (00:58 UTC)
Expired
May 29, 2015, 1:01 AM CDT
In force
5 hr
Issued by
the Storm Prediction Center
Largest hail expected
1.5 in
Strongest gust expected
60 kt
All 22 counties

Bandera County, TX, Blanco County, TX, Coleman County, TX, Concho County, TX, Crockett County, TX, Edwards County, TX, Gillespie County, TX, Kendall County, TX, Kerr County, TX, Kimble County, TX, Kinney County, TX, Llano County, TX, Mason County, TX, McCulloch County, TX, Menard County, TX, Real County, TX, San Saba County, TX, Schleicher County, TX, Sutton County, TX, Tom Green County, TX, Uvalde County, TX, Val Verde County, TX

The radar

The San Angelo radar (KSJT), 114 km from the middle of the area, began a volume at 01:01 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.

What SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes
10%
One or more EF2 to EF5 tornadoes
2%
Ten or more severe wind reports
30%
One or more gusts of 65 knots or more
10%
Ten or more severe hail reports
20%
One or more hailstones of 2 inches or more
10%
Six or more combined severe hail and wind reports
50%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
May 28, 7:58 PM CDTSevere Thunderstorm WarningSJTConcho, Menard, Schleicher, Tom Green47 min
May 28, 8:17 PM CDTSevere Thunderstorm WarningSJTCrockett, Schleicher, Sutton58 min
May 28, 8:58 PM CDTSevere Thunderstorm WarningSJTKimble, Menard, Schleicher, Sutton47 min
May 28, 9:00 PM CDTSevere Thunderstorm WarningEWXVal Verde75 min
May 28, 9:11 PM CDTSevere Thunderstorm WarningSJTBrown, Coleman, Concho, McCulloch, San Saba49 min
May 28, 9:31 PM CDTSevere Thunderstorm WarningSJTKimble, McCulloch, Mason, Menard59 min
May 28, 9:36 PM CDTTornado WarningSJTKimble, Mason, Menard24 min
May 28, 9:37 PM CDTSevere Thunderstorm WarningEWXEdwards, Kerr, Real, Val Verde68 min
May 28, 9:57 PM CDTSevere Thunderstorm WarningEWXEdwards, Kinney, Real, Uvalde, Val Verde93 min
May 28, 9:59 PM CDTTornado WarningSJTMason31 min
May 28, 10:10 PM CDTFlash Flood WarningSJTKimble, Mason, Menard3 hr
May 28, 10:23 PM CDTSevere Thunderstorm WarningSJTKimble, Mason52 min
May 28, 10:24 PM CDTSevere Thunderstorm WarningEWXGillespie, Kerr, Llano81 min
May 28, 10:55 PM CDTSevere Thunderstorm WarningEWXBandera65 min
May 28, 11:05 PM CDTFlash Flood WarningEWXEdwards, Gillespie, Kerr, Llano, Real4 hr
May 28, 11:16 PM CDTSevere Thunderstorm WarningEWXBlanco, Burnet, Kendall89 min
May 28, 11:31 PM CDTFlash Flood WarningEWXBandera, Kendall, Kerr, Medina, Real, Uvalde4 hr
May 28, 11:48 PM CDTFlash Flood WarningEWXBlanco, Burnet, Comal, Gillespie, Hays, Kendall and 3 more4 hr
May 29, 12:13 AM CDTFlash Flood WarningEWXBandera, Bexar, Medina, Uvalde4 hr

Discussions around it

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

The nearest sounding before it

Del Rio, TX (KDLF), launched 00:00Z, 1.0 hours before the alert went out and 117 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 2015-05-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2419 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 2015-05-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 70 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
2419 J/kg
Mixed-layer CIN
-22 J/kg
Mixed-layer LCL
1473 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
70 m²/s²
0-3 km storm-relative helicity
108 m²/s²
Significant tornado parameter
0.4
Supercell composite
4.9

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 28, 9:58 PM CDTMesoscale DiscussionSPCAtascosa, Bandera, Bastrop, Bee, Bell, Bexar and 68 more2 hr
May 28, 10:19 PM CDTSevere Thunderstorm WatchSPCAtascosa, Bastrop, Bexar, Burnet, Caldwell, Comal and 20 more7 hr
May 29, 1:22 AM CDTMesoscale DiscussionSPCAtascosa, Bee, Brooks, Dimmit, Duval, Hidalgo and 12 more83 min
May 29, 12:33 PM CDTMesoscale DiscussionSPCBowie, Cass, Gregg, Harrison, Marion, Morris and 5 more87 min
May 29, 2:27 PM CDTMesoscale DiscussionSPCDallam, Deaf Smith, Hartley, Oldham, Parmer93 min
May 29, 3:44 PM CDTSevere Thunderstorm WatchSPCBailey, Castro, Dallam, Deaf Smith, Hale, Hartley and 8 more7 hr
May 29, 4:48 PM CDTMesoscale DiscussionSPCBowie, Red River87 min

Nearby

Severe Thunderstorm Watches in Texas, 2015Every severe thunderstorm watch in 2015

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.