Alert archive / Texas / Severe Thunderstorm Watches in 2016

Severe Thunderstorm Watch 181

May 17, 20169 counties in Texas

The Storm Prediction Center issued this severe thunderstorm watch at May 17, 2016, 6:20 PM CDT for 9 counties in Texas. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
May 17, 2016, 6:20 PM CDT (23:20 UTC)
Expired
May 17, 2016, 11:00 PM CDT
In force
5 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
60 kt

Counties Brooks County, TX, Duval County, TX, Hidalgo County, TX, Jim Hogg County, TX, La Salle County, TX, McMullen County, TX, Starr County, TX, Webb County, TX, Zapata County, TX

The radar

The Corpus Christi radar (KCRP), 159 km from the middle of the area, began a volume at 23:22 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
20%
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
30%
One or more hailstones of 2 inches or more
30%
Six or more combined severe hail and wind reports
60%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
May 17, 6:25 PM CDTSevere Thunderstorm WarningCRPLa Salle, Webb65 min
May 17, 6:51 PM CDTSevere Thunderstorm WarningCRPDuval, Webb39 min
May 17, 6:56 PM CDTFlash Flood WarningCRPWebb3 hr
May 17, 7:25 PM CDTSevere Thunderstorm WarningCRPDuval, Webb65 min
May 17, 7:27 PM CDTSevere Thunderstorm WarningBROBrooks, Jim Hogg63 min
May 17, 7:38 PM CDTSevere Thunderstorm WarningBROJim Hogg37 min
May 17, 8:02 PM CDTSevere Thunderstorm WarningBROJim Hogg, Zapata88 min
May 17, 8:24 PM CDTSevere Thunderstorm WarningCRPDuval, Webb36 min
May 17, 8:30 PM CDTSevere Thunderstorm WarningBROBrooks, Jim Hogg90 min
May 17, 8:33 PM CDTFlash Flood WarningBROBrooks, Jim Hogg87 min
May 17, 9:18 PM CDTSevere Thunderstorm WarningBROBrooks, Jim Hogg, Starr, Zapata61 min
May 17, 10:16 PM CDTSevere Thunderstorm WarningBROZapata59 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

Corpus Christi, TX (KCRP), launched 12:00Z, 11.3 hours before the alert went out and 176 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 12:00Z on 2016-05-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2359 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 12:00Z on 2016-05-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 30 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
2359 J/kg
Mixed-layer CIN
-66 J/kg
Mixed-layer LCL
536 m above ground
0-6 km bulk shear
13 kt
0-1 km storm-relative helicity
30 m²/s²
0-3 km storm-relative helicity
57 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.5

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 16, 7:23 PM CDTMesoscale DiscussionSPCCarson, Collingsworth, Gray, Hansford, Hartley, Hemphill and 7 more67 min
May 16, 11:58 PM CDTSevere Thunderstorm WatchSPCArcher, Baylor, Briscoe, Childress, Clay, Cottle and 7 more5 hr
May 17, 2:08 AM CDTMesoscale DiscussionSPCClay, Cooke, Foard, Hardeman, Montague, Wichita and 1 more2 hr
May 17, 1:52 PM CDTMesoscale DiscussionSPCBandera, Crane, Crockett, Edwards, Irion, Kerr and 8 more113 min
May 17, 2:25 PM CDTSevere Thunderstorm WatchSPCAtascosa, Bandera, Bexar, Blanco, Brewster, Comal and 34 more13 hr
May 17, 5:18 PM CDTMesoscale DiscussionSPCBee, Duval, Jim Wells, Live Oak, Webb57 min
May 17, 5:38 PM CDTMesoscale DiscussionSPCBandera, Crockett, Dimmit, Edwards, Frio, Gillespie and 17 more97 min

Nearby

Severe Thunderstorm Watches in Texas, 2016Every severe thunderstorm watch in 2016

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.