Alert archive / Texas / Severe Thunderstorm Watches in 2015

Severe Thunderstorm Watch 81

April 19, 201516 counties in Arkansas; 22 parishes in Louisiana; 43 counties in Texas

The Storm Prediction Center issued this severe thunderstorm watch at Apr 19, 2015, 2:31 PM CDT for 16 counties in Arkansas; 22 parishes in Louisiana; 43 counties in Texas. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued: Apr 19, 2015, 2:31 PM CDT (19:31 UTC)
Expired: Apr 19, 2015, 9:49 PM CDT
In force: 7 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2.5 in
Strongest gust expected: 60 kt

All 81 counties

Bradley County, AR, Calhoun County, AR, Clark County, AR, Cleveland County, AR, Columbia County, AR, Dallas County, AR, Hempstead County, AR, Howard County, AR, Lafayette County, AR, Little River County, AR, Miller County, AR, Nevada County, AR, Ouachita County, AR, Pike County, AR, Sevier County, AR, Union County, AR, Allen Parish, LA, Beauregard Parish, LA, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Calcasieu Parish, LA, Caldwell Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Grant Parish, LA, Jackson Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Rapides Parish, LA, Red River Parish, LA, Sabine Parish, LA, Union Parish, LA, Vernon Parish, LA, Webster Parish, LA, Winn Parish, LA, Angelina County, TX, Austin County, TX, Bastrop County, TX, Bowie County, TX, Brazoria County, TX, Brazos County, TX, Burleson County, TX, Cass County, TX, Chambers County, TX, Cherokee County, TX, Colorado County, TX, Fayette County, TX, Fort Bend County, TX, Galveston County, TX, Gregg County, TX, Grimes County, TX, Hardin County, TX, Harris County, TX, Harrison County, TX, Houston County, TX, Jasper County, TX, Jefferson County, TX, Lavaca County, TX, Lee County, TX, Liberty County, TX, Madison County, TX, Marion County, TX, Montgomery County, TX, Nacogdoches County, TX, Newton County, TX, Orange 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, Trinity County, TX, Tyler County, TX, Walker County, TX, Waller County, TX, Washington County, TX

The radar

The Shreveport radar (KSHV), 135 km from the middle of the area, began a volume at 19:31 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: 60%
One or more gusts of 65 knots or more: 10%
Ten or more severe hail reports: 80%
One or more hailstones of 2 inches or more: 60%
Six or more combined severe hail and wind reports: 80%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Apr 19, 2:55 PM CDT	Severe Thunderstorm Warning	EWX	Lee	35 min
Apr 19, 3:10 PM CDT	Severe Thunderstorm Warning	HGX	Burleson, Washington	50 min
Apr 19, 3:44 PM CDT	Severe Thunderstorm Warning	HGX	Brazos, Burleson, Grimes, Washington	61 min
Apr 19, 3:45 PM CDT	Severe Thunderstorm Warning	HGX	Brazos, Grimes, Madison	30 min
Apr 19, 3:53 PM CDT	Severe Thunderstorm Warning	EWX	Bastrop	37 min
Apr 19, 4:07 PM CDT	Severe Thunderstorm Warning	LZK	Montgomery, Pike	38 min
Apr 19, 4:18 PM CDT	Severe Thunderstorm Warning	EWX	Fayette	27 min
Apr 19, 4:35 PM CDT	Severe Thunderstorm Warning	SHV	Hempstead, Nevada	40 min
Apr 19, 4:39 PM CDT	Severe Thunderstorm Warning	HGX	Grimes, Houston, Madison, Walker	36 min
Apr 19, 4:39 PM CDT	Severe Thunderstorm Warning	SHV	Cherokee, Nacogdoches, Rusk	66 min
Apr 19, 4:43 PM CDT	Severe Thunderstorm Warning	EWX	Fayette	32 min
Apr 19, 4:46 PM CDT	Severe Thunderstorm Warning	HGX	Grimes, Harris, Waller, Washington	44 min
Apr 19, 4:50 PM CDT	Severe Thunderstorm Warning	HGX	Burleson, Washington	25 min
Apr 19, 4:51 PM CDT	Severe Thunderstorm Warning	LZK	Clark	39 min
Apr 19, 4:52 PM CDT	Severe Thunderstorm Warning	SHV	Panola, Rusk	23 min
Apr 19, 4:59 PM CDT	Severe Thunderstorm Warning	HGX	Houston, Trinity	31 min
Apr 19, 5:02 PM CDT	Severe Thunderstorm Warning	SHV	Gregg, Harrison, Panola, Rusk	28 min
Apr 19, 5:10 PM CDT	Severe Thunderstorm Warning	HGX	Grimes, Walker	21 min
Apr 19, 5:11 PM CDT	Severe Thunderstorm Warning	SHV	Nevada	22 min
Apr 19, 5:11 PM CDT	Severe Thunderstorm Warning	SHV	Lafayette, Miller	49 min
Apr 19, 5:12 PM CDT	Severe Thunderstorm Warning	HGX	Grimes, Harris, Montgomery, Waller	48 min
Apr 19, 5:13 PM CDT	Severe Thunderstorm Warning	EWX	Fayette	47 min
Apr 19, 5:16 PM CDT	Severe Thunderstorm Warning	HGX	Houston, Trinity, Walker	29 min
Apr 19, 5:17 PM CDT	Severe Thunderstorm Warning	SHV	Panola, Rusk, Shelby	28 min
Apr 19, 5:30 PM CDT	Severe Thunderstorm Warning	LZK	Clark, Dallas, Grant, Hot Spring	45 min
Apr 19, 5:30 PM CDT	Severe Thunderstorm Warning	SHV	Harrison, Panola	30 min
Apr 19, 5:39 PM CDT	Severe Thunderstorm Warning	SHV	Nacogdoches, Panola, Rusk, Shelby	36 min
Apr 19, 5:42 PM CDT	Severe Thunderstorm Warning	SHV	Nacogdoches	33 min
Apr 19, 5:45 PM CDT	Tornado Warning	SHV	Nacogdoches, Rusk, Shelby	60 min
Apr 19, 5:47 PM CDT	Severe Thunderstorm Warning	HGX	Grimes, Walker	28 min
Apr 19, 5:47 PM CDT	Severe Thunderstorm Warning	SHV	Panola, Rusk, Shelby	28 min
Apr 19, 5:50 PM CDT	Severe Thunderstorm Warning	EWX	Fayette	40 min
Apr 19, 5:55 PM CDT	Severe Thunderstorm Warning	HGX	Harris, Montgomery, Waller	65 min
Apr 19, 5:59 PM CDT	Severe Thunderstorm Warning	HGX	Grimes, Harris, Montgomery, Waller	31 min
Apr 19, 6:00 PM CDT	Severe Thunderstorm Warning	SHV	Caddo, De Soto, Red River	60 min
Apr 19, 6:13 PM CDT	Severe Thunderstorm Warning	LZK	Dallas, Grant, Jefferson, Pulaski	47 min
Apr 19, 6:13 PM CDT	Severe Thunderstorm Warning	SHV	Nacogdoches, San Augustine, Shelby	62 min
Apr 19, 6:17 PM CDT	Tornado Warning	SHV	Caddo, De Soto, Red River	28 min
Apr 19, 6:24 PM CDT	Severe Thunderstorm Warning	SHV	Bossier, Caddo	48 min
Apr 19, 6:27 PM CDT	Severe Thunderstorm Warning	HGX	Austin, Colorado, Waller	33 min
Apr 19, 6:29 PM CDT	Severe Thunderstorm Warning	SHV	De Soto, Sabine	31 min
Apr 19, 6:32 PM CDT	Severe Thunderstorm Warning	SHV	Natchitoches, Sabine	28 min
Apr 19, 6:38 PM CDT	Severe Thunderstorm Warning	HGX	Harris, Liberty, Montgomery	37 min
Apr 19, 6:41 PM CDT	Tornado Warning	HGX	Harris, Liberty	34 min
Apr 19, 6:47 PM CDT	Tornado Warning	SHV	Bossier, Webster	39 min
Apr 19, 6:47 PM CDT	Severe Thunderstorm Warning	HGX	Austin, Colorado, Waller	28 min
Apr 19, 6:53 PM CDT	Severe Thunderstorm Warning	LZK	Arkansas, Cleveland, Jefferson, Lincoln	37 min
Apr 19, 6:56 PM CDT	Severe Thunderstorm Warning	SHV	De Soto, Sabine	34 min
Apr 19, 6:58 PM CDT	Severe Thunderstorm Warning	HGX	Harris	47 min
Apr 19, 6:59 PM CDT	Severe Thunderstorm Warning	HGX	Austin, Fort Bend, Harris, Waller	31 min
Apr 19, 7:02 PM CDT	Severe Thunderstorm Warning	SHV	Sabine	40 min
Apr 19, 7:02 PM CDT	Severe Thunderstorm Warning	SHV	Grant, Natchitoches, Winn	43 min
Apr 19, 7:07 PM CDT	Severe Thunderstorm Warning	LCH	Rapides	53 min
Apr 19, 7:09 PM CDT	Severe Thunderstorm Warning	LZK	Cleveland, Jefferson, Lincoln	51 min
Apr 19, 7:12 PM CDT	Severe Thunderstorm Warning	SHV	Grant, Natchitoches	48 min
Apr 19, 7:13 PM CDT	Severe Thunderstorm Warning	LCH	Vernon	47 min
Apr 19, 7:16 PM CDT	Severe Thunderstorm Warning	SHV	Grant, Natchitoches, Winn	29 min
Apr 19, 7:18 PM CDT	Severe Thunderstorm Warning	HGX	Chambers, Liberty	42 min
Apr 19, 7:25 PM CDT	Severe Thunderstorm Warning	LCH	Jasper, Newton	50 min
Apr 19, 7:29 PM CDT	Severe Thunderstorm Warning	HGX	Austin, Fort Bend, Waller	46 min
Apr 19, 7:31 PM CDT	Severe Thunderstorm Warning	SHV	Natchitoches, Sabine	29 min
Apr 19, 7:44 PM CDT	Severe Thunderstorm Warning	HGX	Harris	31 min
Apr 19, 7:46 PM CDT	Severe Thunderstorm Warning	SHV	Grant, Natchitoches	59 min
Apr 19, 7:46 PM CDT	Severe Thunderstorm Warning	HGX	Austin, Colorado, Fort Bend, Wharton	29 min
Apr 19, 7:58 PM CDT	Severe Thunderstorm Warning	LCH	Rapides, Vernon	62 min
Apr 19, 8:01 PM CDT	Severe Thunderstorm Warning	LCH	Vernon	34 min
Apr 19, 8:01 PM CDT	Severe Thunderstorm Warning	HGX	Chambers	44 min
Apr 19, 8:11 PM CDT	Tornado Warning	LCH	Rapides	34 min
Apr 19, 8:11 PM CDT	Severe Thunderstorm Warning	EWX	Lavaca	49 min
Apr 19, 8:12 PM CDT	Severe Thunderstorm Warning	SHV	Grant, Natchitoches, Winn	63 min
Apr 19, 8:14 PM CDT	Severe Thunderstorm Warning	LCH	Jefferson, Orange	46 min
Apr 19, 8:17 PM CDT	Severe Thunderstorm Warning	SHV	Grant, LaSalle	28 min
Apr 19, 8:40 PM CDT	Severe Thunderstorm Warning	SHV	Caldwell, Ouachita	35 min
Apr 19, 8:43 PM CDT	Tornado Warning	LCH	Avoyelles, Rapides	19 min
Apr 19, 8:43 PM CDT	Severe Thunderstorm Warning	EWX	Lavaca	32 min
Apr 19, 8:45 PM CDT	Severe Thunderstorm Warning	SHV	Caldwell, LaSalle, Winn	60 min
Apr 19, 8:53 PM CDT	Severe Thunderstorm Warning	HGX	Chambers, Galveston	37 min
Apr 19, 9:07 PM CDT	Severe Thunderstorm Warning	LCH	Jefferson	53 min
Apr 19, 9:21 PM CDT	Severe Thunderstorm Warning	LCH	Rapides	39 min
Apr 19, 9:36 PM CDT	Tornado Warning	LCH	Rapides	24 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 (KBAD), launched 12:00Z, 7.5 hours before the alert went out and 143 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 976 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 129 m²/s²
0-3 km storm-relative helicity: 130 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.

Issued	Product	Office	Counties	Lasted
Apr 19, 12:43 PM CDT	Mesoscale Discussion	SPC	Benton, Carroll, Clark, Crawford, Franklin, Garland and 19 more	2 hr
Apr 19, 1:42 PM CDT	Severe Thunderstorm Watch	SPC	Baxter, Benton, Boone, Carroll, Conway, Crawford and 22 more	6 hr
Apr 19, 1:52 PM CDT	Mesoscale Discussion	SPC	Columbia, Lafayette, Little River, Miller	53 min
Apr 19, 4:45 PM CDT	Mesoscale Discussion	SPC	Arkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 28 more	2 hr
Apr 19, 5:46 PM CDT	Tornado Watch	SPC	Arkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 36 more	6 hr
Apr 19, 2:06 AM CDT	Mesoscale Discussion	SPC	Ascension, Assumption, East Baton Rouge, East Feliciana, Livingston, Orleans and 7 more	84 min
Apr 19, 2:56 AM CDT	Mesoscale Discussion	SPC	Allen, Avoyelles, Bienville, Caldwell, Catahoula, Concordia and 11 more	94 min
Apr 19, 6:56 PM CDT	Mesoscale Discussion	SPC	Cameron	64 min
Apr 18, 7:46 PM CDT	Mesoscale Discussion	SPC	Childress, Cottle, Foard, Hardeman, Wichita, Wilbarger	89 min
Apr 18, 8:24 PM CDT	Mesoscale Discussion	SPC	Anderson, Bastrop, Bell, Blanco, Brazos, Burleson and 25 more	96 min

Nearby

Severe Thunderstorm Watches in Texas, 2015 Severe Thunderstorm Watches in Louisiana, 2015 Severe Thunderstorm Watches in Arkansas, 2015 Every 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.