Alert archive / Texas / Severe Thunderstorm Watches in 2018
Severe Thunderstorm Watch 29
The Storm Prediction Center issued this severe thunderstorm watch at Apr 3, 2018, 5:51 PM CDT for 10 parishes in Louisiana; 40 counties in Texas. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 3, 2018, 5:51 PM CDT (22:51 UTC)
- Expired
- Apr 4, 2018, 12:00 AM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 50 counties
Acadia Parish, LA, Allen Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Evangeline Parish, LA, Jefferson Davis Parish, LA, Rapides Parish, LA, Saint Landry Parish, LA, Vernon Parish, LA, Austin County, TX, Bastrop County, TX, Bexar County, TX, Blanco County, TX, Brazos County, TX, Burleson County, TX, Burnet County, TX, Caldwell County, TX, Colorado County, TX, Comal County, TX, DeWitt County, TX, Fayette County, TX, Fort Bend County, TX, Gonzales County, TX, Grimes County, TX, Guadalupe County, TX, Hardin County, TX, Harris County, TX, Hays County, TX, Jasper County, TX, Jefferson County, TX, Karnes County, TX, Kendall County, TX, Lavaca County, TX, Lee County, TX, Liberty County, TX, Montgomery County, TX, Newton County, TX, Orange County, TX, Polk County, TX, San Jacinto County, TX, Travis County, TX, Trinity County, TX, Tyler County, TX, Walker County, TX, Waller County, TX, Washington County, TX, Wharton County, TX, Williamson County, TX, Wilson County, TX
The radar
The Houston radar (KHGX), 115 km from the middle of the area, began a volume at 22:54 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
- 5%
- Ten or more severe wind reports
- 40%
- One or more gusts of 65 knots or more
- 20%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 20%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
18 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 3, 6:15 PM CDT | Severe Thunderstorm Warning | LCH | Jasper, Newton | 45 min |
| Apr 3, 6:48 PM CDT | Severe Thunderstorm Warning | LCH | Rapides, Vernon | 57 min |
| Apr 3, 7:11 PM CDT | Severe Thunderstorm Warning | HGX | Grimes, Houston, Madison, Trinity, Walker | 34 min |
| Apr 3, 8:31 PM CDT | Severe Thunderstorm Warning | LCH | Jasper, Newton | 29 min |
| Apr 3, 8:53 PM CDT | Severe Thunderstorm Warning | LCH | Vernon | 37 min |
| Apr 3, 9:00 PM CDT | Severe Thunderstorm Warning | LCH | Rapides, Vernon | 45 min |
| Apr 3, 9:12 PM CDT | Severe Thunderstorm Warning | EWX | Bexar, Guadalupe, Wilson | 48 min |
| Apr 3, 9:13 PM CDT | Severe Thunderstorm Warning | LCH | Beauregard, Vernon | 47 min |
| Apr 3, 9:30 PM CDT | Severe Thunderstorm Warning | LCH | Beauregard, Rapides, Vernon | 60 min |
| Apr 3, 9:43 PM CDT | Severe Thunderstorm Warning | EWX | Guadalupe, Wilson | 31 min |
| Apr 3, 9:56 PM CDT | Severe Thunderstorm Warning | LCH | Allen, Beauregard, Calcasieu, Evangeline, Jefferson Davis, Rapides and 1 more | 34 min |
| Apr 3, 10:01 PM CDT | Severe Thunderstorm Warning | HGX | Austin, Colorado, Fort Bend, Harris, Waller, Wharton | 29 min |
| Apr 3, 10:04 PM CDT | Severe Thunderstorm Warning | EWX | DeWitt, Gonzales, Guadalupe, Karnes, Wilson | 40 min |
| Apr 3, 10:29 PM CDT | Severe Thunderstorm Warning | LCH | Allen, Avoyelles, Evangeline, Rapides | 61 min |
| Apr 3, 10:29 PM CDT | Severe Thunderstorm Warning | HGX | Austin, Colorado, Fort Bend, Harris, Waller, Wharton | 24 min |
| Apr 3, 10:42 PM CDT | Tornado Warning | LCH | Evangeline | 12 min |
| Apr 3, 10:58 PM CDT | Severe Thunderstorm Warning | LCH | Avoyelles, Evangeline, Saint Landry | 47 min |
| Apr 3, 11:53 PM CDT | Severe Thunderstorm Warning | HGX | Brazoria, Chambers, Galveston, Harris | 37 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, 10.9 hours before the alert went out and 139 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
- 321 J/kg
- Mixed-layer CIN
- -154 J/kg
- Mixed-layer LCL
- 684 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 227 m²/s²
- 0-3 km storm-relative helicity
- 469 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 3.2
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 3, 10:26 AM CDT | Severe Thunderstorm Watch | SPC | Bossier, Caddo, De Soto, Sabine, Webster | 8 hr |
| Apr 3, 4:33 PM CDT | Mesoscale Discussion | SPC | Bienville, Caldwell, Catahoula, Claiborne, Concordia, East Carroll and 16 more | 57 min |
| Apr 3, 4:51 PM CDT | Severe Thunderstorm Watch | SPC | Bienville, Caldwell, Catahoula, Claiborne, Concordia, East Carroll and 15 more | 5 hr |
| Apr 3, 5:19 PM CDT | Mesoscale Discussion | SPC | Beauregard, Vernon | 86 min |
| Apr 3, 9:49 AM CDT | Mesoscale Discussion | SPC | Anderson, Angelina, Bell, Brazos, Burleson, Burnet and 40 more | 116 min |
| Apr 3, 1:55 PM CDT | Mesoscale Discussion | SPC | Anderson, Bell, Bosque, Bowie, Burnet, Camp and 47 more | 95 min |
Nearby
Severe Thunderstorm Watches in Texas, 2018Severe Thunderstorm Watches in Louisiana, 2018Every severe thunderstorm watch in 2018
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.