Alert archive / Texas / Tornado Watches in 2017
Tornado Watch 175
The Storm Prediction Center issued this tornado watch at Apr 29, 2017, 5:10 PM CDT for 24 counties in Texas. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 29, 2017, 5:10 PM CDT (22:10 UTC)
- Expired
- Apr 29, 2017, 10:00 PM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 24 counties
Anderson County, TX, Camp County, TX, Cherokee County, TX, Delta County, TX, Fannin County, TX, Franklin County, TX, Freestone County, TX, Henderson County, TX, Hopkins County, TX, Hunt County, TX, Kaufman County, TX, Lamar County, TX, Leon County, TX, Limestone County, TX, Morris County, TX, Navarro County, TX, Rains County, TX, Red River County, TX, Rockwall County, TX, Smith County, TX, Titus County, TX, Upshur County, TX, Van Zandt County, TX, Wood County, TX
The radar
The Dallas/Ft Worth radar (KFWS), 138 km from the middle of the area, began a volume at 22:13 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
- 40%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 60%
Warnings issued inside it
31 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 29, 5:12 PM CDT | Severe Thunderstorm Warning | FWD | Delta, Fannin, Hopkins, Hunt, Lamar, Rains | 48 min |
| Apr 29, 5:23 PM CDT | Severe Thunderstorm Warning | FWD | Ellis, Kaufman | 52 min |
| Apr 29, 5:23 PM CDT | Tornado Warning | FWD | Henderson, Van Zandt | 37 min |
| Apr 29, 5:31 PM CDT | Severe Thunderstorm Warning | FWD | Fannin, Hunt | 59 min |
| Apr 29, 5:33 PM CDT | Tornado Warning | FWD | Henderson | 27 min |
| Apr 29, 5:37 PM CDT | Tornado Warning | FWD | Delta, Hopkins, Hunt | 23 min |
| Apr 29, 5:45 PM CDT | Tornado Warning | FWD | Van Zandt | 30 min |
| Apr 29, 5:49 PM CDT | Severe Thunderstorm Warning | FWD | Hunt, Kaufman, Rains, Van Zandt | 56 min |
| Apr 29, 5:57 PM CDT | Severe Thunderstorm Warning | FWD | Ellis, Henderson, Kaufman, Navarro, Rockwall, Van Zandt | 63 min |
| Apr 29, 6:01 PM CDT | Severe Thunderstorm Warning | FWD | Collin, Delta, Fannin, Hunt, Lamar, Rockwall | 59 min |
| Apr 29, 6:13 PM CDT | Tornado Warning | FWD | Rains, Van Zandt | 47 min |
| Apr 29, 6:50 PM CDT | Tornado Warning | FWD | Van Zandt | 20 min |
| Apr 29, 6:54 PM CDT | Tornado Warning | FWD | Rains, Van Zandt | 36 min |
| Apr 29, 7:04 PM CDT | Severe Thunderstorm Warning | FWD | Henderson, Kaufman, Van Zandt | 56 min |
| Apr 29, 7:18 PM CDT | Tornado Warning | FWD | Van Zandt | 57 min |
| Apr 29, 7:20 PM CDT | Tornado Warning | FWD | Hopkins | 55 min |
| Apr 29, 7:28 PM CDT | Tornado Warning | SHV | Smith, Wood | 32 min |
| Apr 29, 7:32 PM CDT | Severe Thunderstorm Warning | FWD | Rains, Van Zandt | 58 min |
| Apr 29, 7:38 PM CDT | Flash Flood Warning | FWD | Henderson, Navarro | 3 hr |
| Apr 29, 7:44 PM CDT | Severe Thunderstorm Warning | FWD | Hopkins | 31 min |
| Apr 29, 7:47 PM CDT | Severe Thunderstorm Warning | SHV | Franklin, Smith, Wood | 43 min |
| Apr 29, 7:49 PM CDT | Flash Flood Warning | FWD | Rains, Van Zandt | 3 hr |
| Apr 29, 7:58 PM CDT | Tornado Warning | FWD | Van Zandt | 32 min |
| Apr 29, 7:59 PM CDT | Severe Thunderstorm Warning | FWD | Delta, Hopkins, Lamar | 30 min |
| Apr 29, 7:59 PM CDT | Severe Thunderstorm Warning | SHV | Franklin, Red River, Titus, Wood | 33 min |
| Apr 29, 8:12 PM CDT | Severe Thunderstorm Warning | SHV | Smith, Upshur, Wood | 63 min |
| Apr 29, 8:18 PM CDT | Severe Thunderstorm Warning | SHV | Franklin, Morris, Red River, Titus | 57 min |
| Apr 29, 8:25 PM CDT | Severe Thunderstorm Warning | SHV | Smith, Wood | 65 min |
| Apr 29, 8:26 PM CDT | Tornado Warning | SHV | Smith, Wood | 49 min |
| Apr 29, 8:35 PM CDT | Tornado Warning | SHV | Smith, Wood | 40 min |
| Apr 29, 9:15 PM CDT | Severe Thunderstorm Warning | SHV | Bowie, Camp, Franklin, Marion, Morris, Red River and 4 more | 44 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, 10.2 hours before the alert went out and 131 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
- 2666 J/kg
- Mixed-layer CIN
- -137 J/kg
- Mixed-layer LCL
- 683 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 353 m²/s²
- 0-3 km storm-relative helicity
- 528 m²/s²
- Significant tornado parameter
- 1.8
- Supercell composite
- 14.1
The text
As transmitted.
112 WWUS20 KWNS 292206 SEL5 SPC WW 292206 TXZ000-300300- URGENT - IMMEDIATE BROADCAST REQUESTED Tornado Watch Number 175 NWS Storm Prediction Center Norman OK 510 PM CDT Sat Apr 29 2017 The NWS Storm Prediction Center has issued a * Tornado Watch for portions of Northeast Texas * Effective this Saturday afternoon and evening from 510 PM until 1000 PM CDT. * Primary threats include... A couple tornadoes possible Isolated very large hail events to 2 inches in diameter possible Isolated damaging wind gusts to 70 mph possible SUMMARY...A band of storms ahead of a cold front and on the west edge of an outflow boundary will be in a zone supportive of supercells with the potential to produce a couple of tornadoes, along with isolated large hail and damaging winds. The tornado watch area is approximately along and 40 statute miles east and west of a line from 15 miles northwest of Paris TX to 40 miles southeast of Corsicana TX. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU5). PRECAUTIONARY/PREPAREDNESS ACTIONS... REMEMBER...A Tornado Watch means conditions are favorable for tornadoes and severe thunderstorms in and close to the watch area. Persons in these areas should be on the lookout for threatening weather conditions and listen for later statements and possible warnings. && OTHER WATCH INFORMATION...CONTINUE...WW 174... AVIATION...Tornadoes and a few severe thunderstorms with hail surface and aloft to 2 inches. Extreme turbulence and surface wind gusts to 60 knots. A few cumulonimbi with maximum tops to 550. Mean storm motion vector 22020. ...Thompson
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 28, 10:18 PM CDT | Mesoscale Discussion | SPC | Childress, Collingsworth, Cottle, Foard, Hall, Hardeman and 2 more | 117 min |
| Apr 28, 10:35 PM CDT | Severe Thunderstorm Watch | SPC | Childress, Collingsworth, Cottle, Dickens, Floyd, Foard and 6 more | 8 hr |
| Apr 29, 2:45 AM CDT | Mesoscale Discussion | SPC | Briscoe, Childress, Collingsworth, Cottle, Crosby, Dickens and 8 more | 2 hr |
| Apr 29, 9:19 AM CDT | Mesoscale Discussion | SPC | Hardin, Jasper, Newton, Orange, Sabine, Tyler | 116 min |
| Apr 29, 2:10 PM CDT | Mesoscale Discussion | SPC | Collin, Dallas, Denton, Ellis, Fannin, Grayson and 6 more | 2 hr |
| Apr 29, 6:31 PM CDT | Mesoscale Discussion | SPC | Bastrop, Caldwell, Falls, Lee, Milam, Travis and 1 more | 59 min |
| Apr 29, 6:50 PM CDT | Severe Thunderstorm Watch | SPC | Austin, Bastrop, Bell, Brazos, Burleson, Caldwell and 20 more | 4 hr |
Nearby
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.