Alert archive / Texas / Severe Thunderstorm Watches in 2017

Severe Thunderstorm Watch 192

May 3, 201716 parishes in Louisiana; 35 counties in Texas

The Storm Prediction Center issued this severe thunderstorm watch at May 3, 2017, 5:00 PM CDT for 16 parishes in Louisiana; 35 counties in Texas. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
May 3, 2017, 5:00 PM CDT (22:00 UTC)
Expired
May 4, 2017, 12:11 AM CDT
In force
7 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
60 kt
All 51 counties

Acadia Parish, LA, Allen Parish, LA, Beauregard Parish, LA, Bienville Parish, LA, Calcasieu Parish, LA, Cameron Parish, LA, De Soto Parish, LA, Evangeline Parish, LA, Jefferson Davis Parish, LA, Natchitoches Parish, LA, Rapides Parish, LA, Red River Parish, LA, Sabine Parish, LA, Vermilion Parish, LA, Vernon Parish, LA, Webster Parish, LA, Angelina County, TX, Austin County, TX, Bastrop County, TX, Brazoria County, TX, Brazos County, TX, Burleson County, TX, Chambers County, TX, Colorado County, TX, Fayette County, TX, Fort Bend County, TX, Galveston County, TX, Grimes County, TX, Hardin County, TX, Harris County, TX, Houston County, TX, Jasper County, TX, Jefferson County, TX, Lavaca County, TX, Lee County, TX, Liberty County, TX, Madison County, TX, Montgomery County, TX, Nacogdoches County, TX, Newton County, TX, Orange County, TX, Polk County, TX, Sabine County, TX, San Augustine County, TX, San Jacinto County, TX, Shelby County, TX, Trinity County, TX, Tyler County, TX, Walker County, TX, Waller County, TX, Washington County, TX

The radar

The Houston radar (KHGX), 95 km from the middle of the area, began a volume at 22:00 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
10%
Ten or more severe wind reports
50%
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
80%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
May 3, 5:04 PM CDTSevere Thunderstorm WarningSHVAngelina, Cherokee, Nacogdoches, San Augustine, Shelby56 min
May 3, 5:13 PM CDTSevere Thunderstorm WarningHGXHouston, Madison, Walker32 min
May 3, 5:15 PM CDTFlash Flood WarningLCHAllen, Beauregard, Calcasieu, Jefferson Davis6 hr
May 3, 5:16 PM CDTSevere Thunderstorm WarningSHVSabine59 min
May 3, 5:22 PM CDTFlash Flood WarningLCHAcadia, Evangeline, Iberia, Lafayette, Saint Landry, Saint Martin and 2 more6 hr
May 3, 5:28 PM CDTSevere Thunderstorm WarningSHVBienville, De Soto, Natchitoches, Red River, Webster, Winn47 min
May 3, 5:29 PM CDTFlash Flood WarningLCHJasper, Newton6 hr
May 3, 5:42 PM CDTSevere Thunderstorm WarningHGXBrazos, Burleson, Grimes, Madison48 min
May 3, 5:43 PM CDTSevere Thunderstorm WarningHGXGrimes, Houston, Madison, Trinity, Walker47 min
May 3, 5:47 PM CDTSevere Thunderstorm WarningHGXPolk, Trinity43 min
May 3, 5:49 PM CDTSevere Thunderstorm WarningSHVAngelina, Nacogdoches, Sabine, San Augustine56 min
May 3, 5:58 PM CDTSevere Thunderstorm WarningSHVAngelina, Nacogdoches, San Augustine, Shelby25 min
May 3, 6:08 PM CDTSevere Thunderstorm WarningLCHAcadia, Lafayette, Saint Landry, Saint Martin67 min
May 3, 6:12 PM CDTSevere Thunderstorm WarningSHVSabine45 min
May 3, 6:15 PM CDTSevere Thunderstorm WarningHGXGrimes, San Jacinto, Walker30 min
May 3, 6:21 PM CDTSevere Thunderstorm WarningLCHVernon54 min
May 3, 6:24 PM CDTFlash Flood WarningLCHAvoyelles, Evangeline, Rapides, Saint Landry3 hr
May 3, 6:24 PM CDTFlash Flood WarningSHVSabine3 hr
May 3, 6:25 PM CDTSevere Thunderstorm WarningHGXBrazos, Burleson, Washington50 min
May 3, 6:26 PM CDTFlash Flood WarningLCHJasper, Tyler4 hr
May 3, 6:42 PM CDTSevere Thunderstorm WarningHGXPolk48 min
May 3, 6:53 PM CDTSevere Thunderstorm WarningEWXFayette, Lee37 min
May 3, 7:05 PM CDTSevere Thunderstorm WarningHGXAustin, Burleson, Washington40 min
May 3, 7:06 PM CDTSevere Thunderstorm WarningLCHAvoyelles, Rapides, Vernon32 min
May 3, 7:26 PM CDTSevere Thunderstorm WarningLCHAllen, Beauregard37 min
May 3, 7:27 PM CDTSevere Thunderstorm WarningLCHHardin, Jasper, Tyler48 min
May 3, 7:28 PM CDTSevere Thunderstorm WarningEWXFayette32 min
May 3, 7:32 PM CDTSevere Thunderstorm WarningLCHAllen, Evangeline, Rapides30 min
May 3, 8:13 PM CDTSevere Thunderstorm WarningLCHBeauregard32 min
May 3, 8:30 PM CDTSevere Thunderstorm WarningHGXChambers, Liberty45 min
May 3, 9:16 PM CDTSevere Thunderstorm WarningHGXChambers, Galveston, Liberty29 min
May 3, 9:39 PM CDTSevere Thunderstorm WarningLCHJefferson66 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

Lake Charles Mun, LA (KLCH), launched 12:00Z, 10.0 hours before the alert went out and 212 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, Lake Charles Mun, LA at 12:00Z on 2017-05-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2161 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, Lake Charles Mun, LA at 12:00Z on 2017-05-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 154 square meters per square second.19395878Sfc1 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
2161 J/kg
Mixed-layer CIN
-30 J/kg
Mixed-layer LCL
549 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
154 m²/s²
0-3 km storm-relative helicity
197 m²/s²
Significant tornado parameter
2.2
Supercell composite
12.3

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 3, 7:04 AM CDTMesoscale DiscussionSPCAcadia, Allen, Avoyelles, Beauregard, Calcasieu, Cameron and 13 more86 min
May 3, 7:32 AM CDTTornado WatchSPCAcadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 24 more9 hr
May 3, 10:07 AM CDTMesoscale DiscussionSPCAcadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 21 more83 min
May 3, 12:34 PM CDTSevere Thunderstorm WatchSPCBossier, Caddo5 hr
May 3, 1:58 PM CDTMesoscale DiscussionSPCAcadia, Allen, Assumption, Beauregard, Calcasieu, Cameron and 11 more62 min
May 3, 3:48 PM CDTMesoscale DiscussionSPCAcadia, Allen, Beauregard, Calcasieu, Cameron, Jefferson Davis87 min
May 3, 3:59 PM CDTMesoscale DiscussionSPCBossier, Caddo91 min
May 3, 6:54 PM CDTMesoscale DiscussionSPCAscension, Assumption, East Baton Rouge, Iberville, Livingston, Saint James and 3 more96 min
May 3, 1:30 AM CDTMesoscale DiscussionSPCCollingsworth, Donley, Gray, Hemphill, Wheeler2 hr
May 3, 7:48 AM CDTMesoscale DiscussionSPCBowie, Camp, Cass, Delta, Fannin, Franklin and 11 more117 min
May 3, 11:23 AM CDTMesoscale DiscussionSPCCoryell, Dallas, Ellis, Falls, Freestone, Henderson and 9 more2 hr
May 3, 1:48 PM CDTMesoscale DiscussionSPCAnderson, Bowie, Camp, Cass, Cherokee, Coryell and 31 more87 min

Nearby

Severe Thunderstorm Watches in Texas, 2017Severe Thunderstorm Watches in Louisiana, 2017Every severe thunderstorm watch in 2017

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.