Alert archive / Texas / Severe Thunderstorm Watches in 2017
Severe Thunderstorm Watch 209
The Storm Prediction Center issued this severe thunderstorm watch at May 11, 2017, 2:43 PM CDT for 9 counties in Arkansas; 13 parishes in Louisiana; 60 counties in Texas. It was in force for 9 hr.
The area
The outline as issued.
The facts
- Issued
- May 11, 2017, 2:43 PM CDT (19:43 UTC)
- Expired
- May 12, 2017, 12:00 AM CDT
- In force
- 9 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2.5 in
- Strongest gust expected
- 60 kt
All 82 counties
Columbia County, AR, Hempstead County, AR, Howard County, AR, Lafayette County, AR, Little River County, AR, Miller County, AR, Nevada County, AR, Sevier County, AR, Union County, AR, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Jackson Parish, LA, Lincoln Parish, LA, Natchitoches Parish, LA, Red River Parish, LA, Sabine Parish, LA, Union Parish, LA, Webster Parish, LA, Winn Parish, LA, Anderson County, TX, Angelina County, TX, Bastrop County, TX, Bowie County, TX, Brazos County, TX, Burleson County, TX, Caldwell County, TX, Camp County, TX, Cass County, TX, Cherokee County, TX, Delta County, TX, Ellis County, TX, Falls County, TX, Fannin County, TX, Fayette County, TX, Franklin County, TX, Freestone County, TX, Gregg County, TX, Grimes County, TX, Harrison County, TX, Hays County, TX, Henderson County, TX, Hill County, TX, Hopkins County, TX, Houston County, TX, Hunt County, TX, Kaufman County, TX, Lamar County, TX, Lee County, TX, Leon County, TX, Limestone County, TX, Madison County, TX, Marion County, TX, McLennan County, TX, Milam County, TX, Montgomery County, TX, Morris County, TX, Nacogdoches County, TX, Navarro County, TX, Panola County, TX, Polk County, TX, Rains County, TX, Red River County, TX, Robertson County, TX, Rockwall County, TX, Rusk County, TX, Sabine County, TX, San Augustine County, TX, San Jacinto County, TX, Shelby County, TX, Smith County, TX, Titus County, TX, Travis County, TX, Trinity County, TX, Upshur County, TX, Van Zandt County, TX, Walker County, TX, Washington County, TX, Williamson County, TX, Wood County, TX
The radar
The Dallas/Ft Worth radar (KFWS), 169 km from the middle of the area, began a volume at 19:46 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
- 30%
- One or more gusts of 65 knots or more
- 5%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 80%
Warnings issued inside it
32 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 11, 4:00 PM CDT | Severe Thunderstorm Warning | HGX | Madison | 15 min |
| May 11, 4:44 PM CDT | Severe Thunderstorm Warning | FWD | Milam, Robertson | 46 min |
| May 11, 4:56 PM CDT | Severe Thunderstorm Warning | SHV | Little River, Sevier | 64 min |
| May 11, 4:57 PM CDT | Severe Thunderstorm Warning | FWD | Delta, Hopkins, Lamar | 36 min |
| May 11, 5:05 PM CDT | Severe Thunderstorm Warning | EWX | Travis, Williamson | 40 min |
| May 11, 5:21 PM CDT | Severe Thunderstorm Warning | SHV | Smith, Upshur, Wood | 54 min |
| May 11, 5:26 PM CDT | Tornado Warning | SHV | Smith, Upshur, Wood | 49 min |
| May 11, 5:34 PM CDT | Severe Thunderstorm Warning | SHV | Red River | 26 min |
| May 11, 5:36 PM CDT | Severe Thunderstorm Warning | FWD | Freestone, Limestone | 54 min |
| May 11, 6:10 PM CDT | Tornado Warning | SHV | Gregg, Smith, Upshur | 50 min |
| May 11, 6:18 PM CDT | Severe Thunderstorm Warning | FWD | Leon | 57 min |
| May 11, 6:46 PM CDT | Severe Thunderstorm Warning | SHV | Gregg, Smith, Upshur | 59 min |
| May 11, 6:48 PM CDT | Severe Thunderstorm Warning | FWD | Milam | 27 min |
| May 11, 6:58 PM CDT | Severe Thunderstorm Warning | SHV | Cherokee, Nacogdoches, Rusk | 62 min |
| May 11, 7:04 PM CDT | Severe Thunderstorm Warning | HGX | Houston, Trinity | 41 min |
| May 11, 7:08 PM CDT | Tornado Warning | SHV | Panola, Rusk | 19 min |
| May 11, 7:11 PM CDT | Tornado Warning | SHV | Cherokee, Nacogdoches, Rusk | 24 min |
| May 11, 7:27 PM CDT | Tornado Warning | SHV | Panola | 33 min |
| May 11, 7:40 PM CDT | Severe Thunderstorm Warning | SHV | Angelina, Cherokee, Nacogdoches | 65 min |
| May 11, 8:11 PM CDT | Severe Thunderstorm Warning | SHV | Bossier, Caddo | 64 min |
| May 11, 8:11 PM CDT | Severe Thunderstorm Warning | HGX | Brazos, Burleson, Washington | 34 min |
| May 11, 8:17 PM CDT | Tornado Warning | SHV | Bossier, Caddo | 28 min |
| May 11, 8:31 PM CDT | Severe Thunderstorm Warning | FWD | Hopkins | 59 min |
| May 11, 8:32 PM CDT | Tornado Warning | SHV | Nacogdoches, Rusk, Shelby | 43 min |
| May 11, 8:44 PM CDT | Severe Thunderstorm Warning | SHV | Nacogdoches, Rusk, San Augustine, Shelby | 50 min |
| May 11, 8:52 PM CDT | Tornado Warning | SHV | Lafayette | 18 min |
| May 11, 9:00 PM CDT | Tornado Warning | SHV | Shelby | 29 min |
| May 11, 9:08 PM CDT | Tornado Warning | SHV | Camp, Franklin, Titus, Wood | 52 min |
| May 11, 9:17 PM CDT | Severe Thunderstorm Warning | SHV | De Soto, Sabine | 43 min |
| May 11, 9:46 PM CDT | Severe Thunderstorm Warning | SHV | Camp, Cass, Morris, Titus | 44 min |
| May 11, 9:47 PM CDT | Severe Thunderstorm Warning | FWD | Anderson, Henderson | 58 min |
| May 11, 10:21 PM CDT | Severe Thunderstorm Warning | SHV | Cherokee, Smith | 54 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
Fort Worth, TX (KFWD), launched 12:00Z, 7.7 hours before the alert went out and 180 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
- 1 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1665 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 15 m²/s²
- 0-3 km storm-relative helicity
- 110 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 11, 12:56 PM CDT | Severe Thunderstorm Watch | SPC | Benton, Carroll, Crawford, Franklin, Madison, Sebastian and 1 more | 8 hr |
| May 11, 1:37 PM CDT | Mesoscale Discussion | SPC | Hempstead, Howard, Lafayette, Little River, Miller, Sevier | 2 hr |
| May 11, 2:49 PM CDT | Mesoscale Discussion | SPC | Baxter, Benton, Boone, Carroll, Clark, Cleburne and 34 more | 116 min |
| May 11, 3:17 PM CDT | Severe Thunderstorm Watch | SPC | Arkansas, Baxter, Boone, Bradley, Calhoun, Clark and 45 more | 7 hr |
| May 11, 5:49 PM CDT | Mesoscale Discussion | SPC | Arkansas, Baxter, Boone, Bradley, Calhoun, Carroll and 56 more | 56 min |
| May 11, 6:07 PM CDT | Mesoscale Discussion | SPC | Benton, Washington | 83 min |
| May 11, 6:20 PM CDT | Mesoscale Discussion | SPC | Caddo | 115 min |
| May 10, 8:31 PM CDT | Mesoscale Discussion | SPC | Callahan, Coke, Coleman, Concho, Crockett, Edwards and 15 more | 119 min |
Nearby
Severe Thunderstorm Watches in Texas, 2017Severe Thunderstorm Watches in Louisiana, 2017Severe Thunderstorm Watches in Arkansas, 2017Every severe thunderstorm watch in 2017
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.