Alert archive / Texas / Severe Thunderstorm Watches in 2015
Severe Thunderstorm Watch 68
The Storm Prediction Center issued this severe thunderstorm watch at Apr 17, 2015, 3:30 PM CDT for 36 counties in Texas. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 17, 2015, 3:30 PM CDT (20:30 UTC)
- Expired
- Apr 17, 2015, 9:45 PM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 36 counties
Aransas County, TX, Atascosa County, TX, Austin County, TX, Bastrop County, TX, Brazoria County, TX, Brazos County, TX, Burleson County, TX, Caldwell County, TX, Calhoun County, TX, Chambers County, TX, Colorado County, TX, DeWitt County, TX, Dimmit County, TX, Fayette County, TX, Fort Bend County, TX, Frio County, TX, Galveston County, TX, Goliad County, TX, Gonzales County, TX, Grimes County, TX, Harris County, TX, Jackson County, TX, Karnes County, TX, Lavaca County, TX, Lee County, TX, Matagorda County, TX, Maverick County, TX, Montgomery County, TX, Refugio County, TX, San Patricio County, TX, Victoria County, TX, Waller County, TX, Washington County, TX, Wharton County, TX, Wilson County, TX, Zavala County, TX
The radar
The Austin/San Antonio radar (KEWX), 124 km from the middle of the area, began a volume at 20:30 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
- 10%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 70%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 70%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 90%
Warnings issued inside it
25 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 17, 3:45 PM CDT | Severe Thunderstorm Warning | EWX | Atascosa, Karnes, Wilson | 45 min |
| Apr 17, 3:46 PM CDT | Severe Thunderstorm Warning | EWX | Kinney, Maverick | 29 min |
| Apr 17, 4:20 PM CDT | Severe Thunderstorm Warning | EWX | DeWitt, Gonzales, Karnes, Lavaca, Wilson | 55 min |
| Apr 17, 4:45 PM CDT | Severe Thunderstorm Warning | CRP | Victoria | 30 min |
| Apr 17, 4:49 PM CDT | Severe Thunderstorm Warning | HGX | Jackson | 41 min |
| Apr 17, 5:14 PM CDT | Severe Thunderstorm Warning | EWX | DeWitt, Gonzales, Lavaca | 61 min |
| Apr 17, 5:45 PM CDT | Severe Thunderstorm Warning | HGX | Colorado, Jackson, Matagorda, Wharton | 45 min |
| Apr 17, 5:54 PM CDT | Severe Thunderstorm Warning | EWX | Dimmit, Maverick, Zavala | 36 min |
| Apr 17, 6:14 PM CDT | Flash Flood Warning | HGX | Colorado, Jackson, Wharton | 2 hr |
| Apr 17, 6:21 PM CDT | Severe Thunderstorm Warning | HGX | Austin, Brazoria, Colorado, Fort Bend, Jackson, Matagorda and 2 more | 39 min |
| Apr 17, 6:28 PM CDT | Severe Thunderstorm Warning | CRP | Goliad | 32 min |
| Apr 17, 6:56 PM CDT | Severe Thunderstorm Warning | HGX | Austin, Brazoria, Fort Bend, Galveston, Harris, Matagorda and 2 more | 49 min |
| Apr 17, 6:57 PM CDT | Severe Thunderstorm Warning | EWX | Dimmit, Frio, Zavala | 37 min |
| Apr 17, 7:09 PM CDT | Tornado Warning | CRP | Bee, Goliad, Refugio | 36 min |
| Apr 17, 7:36 PM CDT | Tornado Warning | CRP | Bee, Goliad, Refugio | 24 min |
| Apr 17, 7:37 PM CDT | Severe Thunderstorm Warning | HGX | Brazoria, Fort Bend, Galveston, Harris, Matagorda | 38 min |
| Apr 17, 7:55 PM CDT | Flash Flood Warning | HGX | Brazoria, Chambers, Fort Bend, Galveston, Harris | 3 hr |
| Apr 17, 7:56 PM CDT | Tornado Warning | CRP | Refugio | 34 min |
| Apr 17, 8:01 PM CDT | Severe Thunderstorm Warning | HGX | Brazoria, Chambers, Galveston, Harris, Matagorda | 44 min |
| Apr 17, 8:25 PM CDT | Flash Flood Warning | HGX | Chambers, Galveston, Harris | 3 hr |
| Apr 17, 8:43 PM CDT | Severe Thunderstorm Warning | HGX | Chambers, Galveston, Harris, Liberty | 47 min |
| Apr 17, 8:50 PM CDT | Severe Thunderstorm Warning | HGX | Chambers, Galveston, Harris, Liberty | 40 min |
| Apr 17, 8:52 PM CDT | Severe Thunderstorm Warning | CRP | San Patricio | 38 min |
| Apr 17, 9:21 PM CDT | Flash Flood Warning | HGX | Jackson, Wharton | 54 min |
| Apr 17, 9:41 PM CDT | Severe Thunderstorm Warning | CRP | Nueces, San Patricio | 34 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, 8.5 hours before the alert went out and 219 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.
- Mixed-layer CAPE
- 854 J/kg
- Mixed-layer CIN
- -117 J/kg
- Mixed-layer LCL
- 525 m above ground
- 0-6 km bulk shear
- 51 kt
- 0-1 km storm-relative helicity
- 89 m²/s²
- 0-3 km storm-relative helicity
- 110 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 4.2
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 16, 7:08 PM CDT | Mesoscale Discussion | SPC | Collingsworth, Wheeler | 2 hr |
| Apr 16, 7:16 PM CDT | Mesoscale Discussion | SPC | Archer, Baylor, Briscoe, Brown, Callahan, Childress and 41 more | 89 min |
| Apr 16, 7:44 PM CDT | Mesoscale Discussion | SPC | Dallam, Hansford, Sherman | 61 min |
| Apr 16, 8:20 PM CDT | Mesoscale Discussion | SPC | Brazoria, Chambers, Colorado, Fort Bend, Galveston, Harris and 2 more | 85 min |
| Apr 16, 8:36 PM CDT | Tornado Watch | SPC | Austin, Brazoria, Chambers, Colorado, Fort Bend, Galveston and 10 more | 3 hr |
| Apr 16, 10:20 PM CDT | Mesoscale Discussion | SPC | Andrews, Armstrong, Borden, Briscoe, Carson, Castro and 32 more | 2 hr |
| Apr 16, 11:33 PM CDT | Mesoscale Discussion | SPC | Austin, Brazoria, Chambers, Colorado, Fort Bend, Galveston and 6 more | 87 min |
| Apr 16, 11:59 PM CDT | Severe Thunderstorm Watch | SPC | Collingsworth, Donley, Gray, Hemphill, Roberts, Wheeler | 5 hr |
| Apr 17, 1:10 AM CDT | Mesoscale Discussion | SPC | Borden, Childress, Cottle, Crosby, Dawson, Dickens and 13 more | 95 min |
| Apr 17, 2:02 AM CDT | Mesoscale Discussion | SPC | Collingsworth, Donley, Gray, Hemphill, Lipscomb, Roberts and 1 more | 88 min |
| Apr 17, 4:43 AM CDT | Mesoscale Discussion | SPC | Hardeman | 62 min |
| Apr 17, 10:26 AM CDT | Mesoscale Discussion | SPC | Bandera, Bexar, Blanco, Burnet, Comal, Edwards and 12 more | 2 hr |
| Apr 17, 10:55 AM CDT | Mesoscale Discussion | SPC | Baylor, Brown, Callahan, Coke, Coleman, Concho and 15 more | 2 hr |
| Apr 17, 11:53 AM CDT | Severe Thunderstorm Watch | SPC | Archer, Atascosa, Bandera, Baylor, Bee, Bell and 73 more | 7 hr |
| Apr 17, 1:31 PM CDT | Mesoscale Discussion | SPC | Atascosa, Bee, Calhoun, DeWitt, Dimmit, Frio and 12 more | 89 min |
| Apr 17, 3:06 PM CDT | Mesoscale Discussion | SPC | Briscoe, Carson, Childress, Collingsworth, Donley, Gray and 8 more | 84 min |
| Apr 17, 3:22 PM CDT | Mesoscale Discussion | SPC | Aransas, Bee, Brazoria, Calhoun, Colorado, DeWitt and 11 more | 113 min |
| Apr 17, 5:02 PM CDT | Mesoscale Discussion | SPC | Archer, Baylor, Bosque, Brown, Callahan, Clay and 28 more | 88 min |
| Apr 17, 5:41 PM CDT | Mesoscale Discussion | SPC | Aransas, Atascosa, Bee, Brazoria, Brooks, Calhoun and 26 more | 94 min |
| Apr 17, 6:57 PM CDT | Tornado Watch | SPC | Aransas, Bee, Brooks, Calhoun, Duval, Goliad and 16 more | 5 hr |
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.