Alert archive / Texas / Severe Thunderstorm Watches in 2013
Severe Thunderstorm Watch 151
The Storm Prediction Center issued this severe thunderstorm watch at May 9, 2013, 3:34 PM CDT for 6 parishes in Louisiana; 31 counties in Texas. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- May 9, 2013, 3:34 PM CDT (20:34 UTC)
- Expired
- May 9, 2013, 10:00 PM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 65 kt
All 37 counties
Beauregard Parish, LA, Calcasieu Parish, LA, Cameron Parish, LA, De Soto Parish, LA, Sabine Parish, LA, Vernon Parish, LA, Angelina County, TX, Brazos County, TX, Burleson County, TX, Chambers County, TX, Cherokee County, TX, Gregg County, TX, Grimes County, TX, Hardin County, TX, Harris County, TX, Houston County, TX, Jasper County, TX, Jefferson County, TX, Liberty County, TX, Madison 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, Smith County, TX, Trinity County, TX, Tyler County, TX, Walker County, TX, Waller County, TX, Washington County, TX
The radar
The Shreveport radar (KSHV), 181 km from the middle of the area, began a volume at 20:35 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
- 90%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 50%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 95%
Warnings issued inside it
17 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 9, 3:57 PM CDT | Severe Thunderstorm Warning | HGX | Brazos, Burleson, Madison | 48 min |
| May 9, 4:30 PM CDT | Severe Thunderstorm Warning | HGX | Brazos, Burleson, Grimes, Madison, Walker | 45 min |
| May 9, 4:52 PM CDT | Severe Thunderstorm Warning | HGX | Brazos, Grimes, Houston, Madison, Walker | 38 min |
| May 9, 5:22 PM CDT | Severe Thunderstorm Warning | HGX | Grimes, Houston, Madison, San Jacinto, Trinity, Walker | 38 min |
| May 9, 5:39 PM CDT | Flash Flood Warning | HGX | Brazos, Burleson | 111 min |
| May 9, 5:43 PM CDT | Severe Thunderstorm Warning | HGX | Brazos, Burleson, Grimes | 32 min |
| May 9, 5:54 PM CDT | Tornado Warning | HGX | Houston, Trinity | 36 min |
| May 9, 5:57 PM CDT | Severe Thunderstorm Warning | HGX | Grimes, Houston, Madison, Montgomery, Polk, San Jacinto and 2 more | 48 min |
| May 9, 6:17 PM CDT | Severe Thunderstorm Warning | HGX | Houston, Polk, San Jacinto, Trinity, Walker | 43 min |
| May 9, 6:26 PM CDT | Flash Flood Warning | HGX | Grimes, Montgomery, Walker | 2 hr |
| May 9, 6:58 PM CDT | Severe Thunderstorm Warning | HGX | Polk, Trinity | 32 min |
| May 9, 7:04 PM CDT | Severe Thunderstorm Warning | HGX | Montgomery, Polk, San Jacinto, Walker | 41 min |
| May 9, 7:06 PM CDT | Severe Thunderstorm Warning | SHV | Angelina | 54 min |
| May 9, 7:24 PM CDT | Severe Thunderstorm Warning | HGX | Polk, Trinity | 36 min |
| May 9, 7:36 PM CDT | Severe Thunderstorm Warning | HGX | Polk, San Jacinto | 39 min |
| May 9, 7:54 PM CDT | Severe Thunderstorm Warning | LCH | Jasper, Tyler | 66 min |
| May 9, 9:00 PM CDT | Severe Thunderstorm Warning | LCH | Jasper, Newton, Tyler | 60 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 (KSHV), launched 12:00Z, 8.6 hours before the alert went out and 189 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
- 327 J/kg
- Mixed-layer CIN
- -300 J/kg
- Mixed-layer LCL
- 527 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 99 m²/s²
- 0-3 km storm-relative helicity
- 146 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 9, 2:52 PM CDT | Mesoscale Discussion | SPC | Beauregard, Calcasieu | 53 min |
| May 9, 6:40 PM CDT | Mesoscale Discussion | SPC | Beauregard, De Soto, Sabine, Vernon | 2 hr |
| May 9, 6:39 AM CDT | Mesoscale Discussion | SPC | Bosque, Brown, Callahan, Coleman, Comanche, Concho and 13 more | 3 hr |
| May 9, 9:37 AM CDT | Mesoscale Discussion | SPC | Bell, Bosque, Brown, Burnet, Coleman, Comanche and 15 more | 113 min |
| May 9, 11:52 AM CDT | Severe Thunderstorm Watch | SPC | Anderson, Bell, Bosque, Brown, Burnet, Callahan and 44 more | 9 hr |
| May 9, 3:19 PM CDT | Mesoscale Discussion | SPC | Anderson, Bell, Bosque, Brown, Burnet, Callahan and 42 more | 56 min |
| May 9, 5:38 PM CDT | Mesoscale Discussion | SPC | Briscoe, Childress, Collingsworth, Cottle, Crosby, Donley and 4 more | 67 min |
| May 9, 6:12 PM CDT | Mesoscale Discussion | SPC | Anderson, Atascosa, Bandera, Bexar, Blanco, Brown and 47 more | 63 min |
Nearby
Severe Thunderstorm Watches in Texas, 2013Severe Thunderstorm Watches in Louisiana, 2013Every severe thunderstorm watch in 2013
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.