Alert archive / Texas / Tornado Watches in 2015

Tornado Watch 125

April 27, 20154 parishes in Louisiana; 56 counties in Texas

The Storm Prediction Center issued this tornado watch at Apr 27, 2015, 1:27 AM CDT for 4 parishes in Louisiana; 56 counties in Texas. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Apr 27, 2015, 1:27 AM CDT (06:27 UTC)
Expired
Apr 27, 2015, 7:31 AM CDT
In force
6 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
65 kt
All 60 counties

Bossier Parish, LA, Caddo Parish, LA, De Soto Parish, LA, Sabine Parish, LA, Angelina County, TX, Atascosa County, TX, Austin County, TX, Bastrop County, TX, Bee County, TX, Brazos County, TX, Burleson County, TX, Caldwell County, TX, Chambers County, TX, Cherokee County, TX, Colorado County, TX, DeWitt County, TX, Fayette County, TX, Fort Bend County, TX, Frio County, TX, Goliad County, TX, Gonzales County, TX, Gregg County, TX, Grimes County, TX, Guadalupe County, TX, Hardin County, TX, Harris County, TX, Harrison County, TX, Houston County, TX, Jackson County, TX, Jasper County, TX, Karnes County, TX, La Salle County, TX, Lavaca County, TX, Lee County, TX, Liberty County, TX, Live Oak County, TX, Madison County, TX, Marion County, TX, McMullen County, TX, Montgomery County, TX, Nacogdoches County, TX, Newton County, TX, Panola County, TX, Polk County, TX, Rusk County, TX, Sabine County, TX, San Augustine County, TX, San Jacinto County, TX, Shelby County, TX, Smith County, TX, Trinity County, TX, Tyler County, TX, Upshur County, TX, Victoria County, TX, Walker County, TX, Waller County, TX, Washington County, TX, Wharton County, TX, Wilson County, TX, Wood County, TX

The radar

The Ft Hood radar (KGRK), 158 km from the middle of the area, began a volume at 06:30 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
40%
One or more EF2 to EF5 tornadoes
10%
Ten or more severe wind reports
40%
One or more gusts of 65 knots or more
30%
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
95%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Apr 27, 1:38 AM CDTSevere Thunderstorm WarningEWXAtascosa, Bastrop, Bexar, Caldwell, Comal, Dimmit and 13 more52 min
Apr 27, 1:54 AM CDTTornado WarningEWXAtascosa, Frio38 min
Apr 27, 2:02 AM CDTSevere Thunderstorm WarningCRPLa Salle, McMullen58 min
Apr 27, 2:10 AM CDTTornado WarningCRPLa Salle35 min
Apr 27, 2:24 AM CDTTornado WarningEWXAtascosa, Wilson36 min
Apr 27, 2:30 AM CDTSevere Thunderstorm WarningEWXBastrop, Caldwell, Fayette, Gonzales, Lavaca, Lee and 2 more45 min
Apr 27, 3:00 AM CDTSevere Thunderstorm WarningEWXDeWitt, Gonzales, Karnes, Wilson60 min
Apr 27, 3:11 AM CDTSevere Thunderstorm WarningSHVCherokee, Smith49 min
Apr 27, 3:21 AM CDTSevere Thunderstorm WarningHGXAustin, Brazos, Burleson, Colorado, Grimes, Madison and 2 more24 min
Apr 27, 3:38 AM CDTSevere Thunderstorm WarningSHVCherokee, Nacogdoches, Rusk67 min
Apr 27, 3:44 AM CDTSevere Thunderstorm WarningHGXHouston31 min
Apr 27, 3:49 AM CDTTornado WarningSHVCherokee26 min
Apr 27, 3:52 AM CDTSevere Thunderstorm WarningHGXAustin, Brazos, Burleson, Colorado, Fort Bend, Grimes and 6 more38 min
Apr 27, 3:59 AM CDTTornado WarningHGXGrimes, Montgomery, Walker31 min
Apr 27, 4:10 AM CDTTornado WarningSHVCherokee24 min
Apr 27, 4:17 AM CDTSevere Thunderstorm WarningHGXHouston13 min
Apr 27, 4:27 AM CDTSevere Thunderstorm WarningHGXGrimes, Harris, Liberty, Montgomery, Polk, San Jacinto and 1 more78 min
Apr 27, 4:32 AM CDTSevere Thunderstorm WarningSHVAngelina, Cherokee, Nacogdoches43 min
Apr 27, 4:33 AM CDTSevere Thunderstorm WarningHGXHouston, Trinity27 min
Apr 27, 4:36 AM CDTTornado WarningHGXPolk, San Jacinto, Trinity, Walker39 min
Apr 27, 4:40 AM CDTSevere Thunderstorm WarningHGXHouston, Polk, San Jacinto, Trinity, Walker35 min
Apr 27, 4:49 AM CDTFlash Flood WarningSHVAngelina, Cherokee, Nacogdoches116 min
Apr 27, 4:50 AM CDTSevere Thunderstorm WarningSHVCherokee, Nacogdoches, Rusk40 min
Apr 27, 4:52 AM CDTTornado WarningHGXLiberty, Polk, San Jacinto23 min
Apr 27, 4:59 AM CDTSevere Thunderstorm WarningLCHHardin, Jasper, Tyler61 min
Apr 27, 5:02 AM CDTSevere Thunderstorm WarningSHVAngelina, Nacogdoches, San Augustine43 min
Apr 27, 5:16 AM CDTTornado WarningLCHHardin, Tyler17 min
Apr 27, 5:18 AM CDTSevere Thunderstorm WarningSHVAngelina, Cherokee, Nacogdoches, Panola, Rusk, Sabine and 2 more42 min
Apr 27, 5:24 AM CDTSevere Thunderstorm WarningHGXPolk21 min
Apr 27, 5:42 AM CDTSevere Thunderstorm WarningHGXChambers, Harris, Liberty63 min
Apr 27, 5:43 AM CDTSevere Thunderstorm WarningSHVAngelina, Nacogdoches, Sabine, San Augustine62 min
Apr 27, 5:53 AM CDTSevere Thunderstorm WarningLCHHardin, Jasper, Newton, Orange, Tyler52 min
Apr 27, 6:15 AM CDTTornado WarningLCHJasper, Newton15 min
Apr 27, 6:36 AM CDTFlash Flood WarningSHVSabine3 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

Shreveport, LA (KBAD), launched 00:00Z, 6.5 hours before the alert went out and 257 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 00:00Z on 2015-04-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 86 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 00:00Z on 2015-04-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 18 square meters per square second.1939587897117Sfc1 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
86 J/kg
Mixed-layer CIN
-209 J/kg
Mixed-layer LCL
2577 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
18 m²/s²
0-3 km storm-relative helicity
13 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.1

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 27, 4:56 AM CDTMesoscale DiscussionSPCAcadia, Allen, Avoyelles, Beauregard, Calcasieu, Cameron and 15 more2 hr
Apr 27, 6:01 AM CDTTornado WatchSPCAcadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 36 more7 hr
Apr 27, 7:44 AM CDTMesoscale DiscussionSPCAcadia, Allen, Ascension, Assumption, Avoyelles, East Baton Rouge and 26 more91 min
Apr 27, 9:47 AM CDTMesoscale DiscussionSPCJefferson, Lafourche, Orleans, Plaquemines, Saint Bernard, Saint Charles and 6 more88 min
Apr 27, 1:08 PM CDTMesoscale DiscussionSPCAcadia, Allen, Avoyelles, Beauregard, Calcasieu, Cameron and 8 more97 min
Apr 26, 7:10 PM CDTMesoscale DiscussionSPCArcher, Baylor, Carson, Childress, Clay, Collingsworth and 14 more65 min
Apr 26, 7:59 PM CDTSevere Thunderstorm WatchSPCBandera, Bexar, Blanco, Brown, Burnet, Coleman and 24 more6 hr
Apr 26, 9:29 PM CDTMesoscale DiscussionSPCDallas, Ellis, Hood, Hunt, Johnson, Kaufman and 4 more91 min
Apr 26, 10:45 PM CDTTornado WatchSPCAnderson, Bell, Bosque, Comanche, Coryell, Ellis and 19 more5 hr
Apr 27, 12:49 AM CDTMesoscale DiscussionSPCAnderson, Angelina, Atascosa, Austin, Bastrop, Bexar and 49 more86 min
Apr 27, 3:42 AM CDTMesoscale DiscussionSPCArcher, Baylor, Clay, Cooke, Denton, Foard and 12 more93 min
Apr 27, 5:25 AM CDTMesoscale DiscussionSPCBrooks, Kenedy95 min
Apr 27, 3:29 PM CDTMesoscale DiscussionSPCAustin, Bastrop, Bell, Bosque, Brazos, Burleson and 22 more91 min

Nearby

Tornado Watches in Texas, 2015Tornado Watches in Louisiana, 2015Every tornado 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.