Alert archive / Louisiana / Tornado Watches in 2017
Tornado Watch 98
The Storm Prediction Center issued this tornado watch at Mar 29, 2017, 2:11 PM CDT for 13 parishes in Louisiana; 12 counties in Texas. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 29, 2017, 2:11 PM CDT (19:11 UTC)
- Expired
- Mar 29, 2017, 9:00 PM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 25 counties
Allen Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Caldwell Parish, LA, Cameron Parish, LA, Grant Parish, LA, Jefferson Davis Parish, LA, LaSalle Parish, LA, Natchitoches Parish, LA, Rapides Parish, LA, Sabine Parish, LA, Vernon Parish, LA, Winn Parish, LA, Angelina County, TX, Chambers County, TX, Galveston County, TX, Hardin County, TX, Jasper County, TX, Jefferson County, TX, Liberty County, TX, Newton County, TX, Orange County, TX, Sabine County, TX, San Augustine County, TX, Tyler County, TX
The radar
The Lake Charles radar (KLCH), 94 km from the middle of the area, began a volume at 19:12 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
- 70%
Warnings issued inside it
29 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 29, 2:17 PM CDT | Flash Flood Warning | HGX | Galveston, Harris | 3 hr |
| Mar 29, 2:26 PM CDT | Severe Thunderstorm Warning | HGX | Liberty, Polk | 34 min |
| Mar 29, 2:37 PM CDT | Severe Thunderstorm Warning | HGX | Chambers, Galveston, Harris, Liberty | 38 min |
| Mar 29, 2:44 PM CDT | Severe Thunderstorm Warning | LCH | Jasper, Tyler | 46 min |
| Mar 29, 2:46 PM CDT | Severe Thunderstorm Warning | LCH | Calcasieu, Cameron | 41 min |
| Mar 29, 3:06 PM CDT | Tornado Warning | HGX | Chambers, Harris | 24 min |
| Mar 29, 3:12 PM CDT | Flash Flood Warning | HGX | Chambers, Harris | 3 hr |
| Mar 29, 3:19 PM CDT | Tornado Warning | LCH | Jasper, Tyler | 41 min |
| Mar 29, 3:20 PM CDT | Severe Thunderstorm Warning | LCH | Beauregard, Calcasieu | 32 min |
| Mar 29, 3:26 PM CDT | Tornado Warning | HGX | Chambers, Liberty | 34 min |
| Mar 29, 3:50 PM CDT | Severe Thunderstorm Warning | LCH | Hardin, Jefferson, Orange | 55 min |
| Mar 29, 3:54 PM CDT | Tornado Warning | LCH | Jasper, Newton, Tyler | 51 min |
| Mar 29, 4:28 PM CDT | Flash Flood Warning | HGX | Chambers, Liberty | 3 hr |
| Mar 29, 4:30 PM CDT | Tornado Warning | LCH | Jasper, Newton | 45 min |
| Mar 29, 4:54 PM CDT | Tornado Warning | SHV | Sabine | 66 min |
| Mar 29, 5:00 PM CDT | Severe Thunderstorm Warning | LCH | Jefferson, Orange | 45 min |
| Mar 29, 5:14 PM CDT | Severe Thunderstorm Warning | SHV | Natchitoches, Sabine | 61 min |
| Mar 29, 5:23 PM CDT | Tornado Warning | SHV | Natchitoches, Sabine | 52 min |
| Mar 29, 5:43 PM CDT | Severe Thunderstorm Warning | LCH | Calcasieu, Cameron | 32 min |
| Mar 29, 5:51 PM CDT | Severe Thunderstorm Warning | SHV | Natchitoches, Sabine | 54 min |
| Mar 29, 5:58 PM CDT | Severe Thunderstorm Warning | SHV | Grant, LaSalle, Natchitoches, Winn | 62 min |
| Mar 29, 6:01 PM CDT | Tornado Warning | LCH | Vernon | 29 min |
| Mar 29, 6:07 PM CDT | Severe Thunderstorm Warning | LCH | Cameron, Jefferson Davis | 53 min |
| Mar 29, 6:21 PM CDT | Severe Thunderstorm Warning | SHV | Grant, Natchitoches, Sabine, Winn | 54 min |
| Mar 29, 6:37 PM CDT | Severe Thunderstorm Warning | LCH | Calcasieu, Cameron | 23 min |
| Mar 29, 7:00 PM CDT | Severe Thunderstorm Warning | LCH | Acadia, Calcasieu, Cameron, Jefferson Davis | 45 min |
| Mar 29, 7:53 PM CDT | Flash Flood Warning | LCH | Calcasieu, Cameron, Jefferson Davis | 6 hr |
| Mar 29, 8:00 PM CDT | Tornado Warning | LCH | Acadia, Jefferson Davis | 30 min |
| Mar 29, 8:27 PM CDT | Tornado Warning | LCH | Allen, Evangeline, Rapides | 12 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, 7.2 hours before the alert went out and 96 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
- 451 J/kg
- Mixed-layer CIN
- -384 J/kg
- Mixed-layer LCL
- 879 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 162 m²/s²
- 0-3 km storm-relative helicity
- 229 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted.
008 WWUS20 KWNS 291909 SEL8 SPC WW 291909 LAZ000-TXZ000-CWZ000-300200- URGENT - IMMEDIATE BROADCAST REQUESTED Tornado Watch Number 98 NWS Storm Prediction Center Norman OK 210 PM CDT Wed Mar 29 2017 The NWS Storm Prediction Center has issued a * Tornado Watch for portions of Western Louisiana Southeast Texas Coastal Waters * Effective this Wednesday afternoon and evening from 210 PM until 900 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...The environment across the region continues to become increasingly favorable for a severe risk including the possibility of a couple of tornadoes. Storms should continue to gradually increase and expand northeastward through the late afternoon and evening hours. The tornado watch area is approximately along and 60 statute miles north and south of a line from 45 miles north northwest of Galveston TX to 30 miles east southeast of Fort Polk LA. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU8). 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. && 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 24025. ...Guyer
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 29, 1:31 PM CDT | Mesoscale Discussion | SPC | Beauregard, Calcasieu, Cameron | 2 hr |
| Mar 29, 5:50 PM CDT | Mesoscale Discussion | SPC | Acadia, Allen, Avoyelles, Beauregard, Bienville, Calcasieu and 27 more | 115 min |
| Mar 28, 7:45 PM CDT | Mesoscale Discussion | SPC | Armstrong, Briscoe, Carson, Castro, Crosby, Deaf Smith and 9 more | 60 min |
| Mar 28, 9:07 PM CDT | Mesoscale Discussion | SPC | Bandera, Bexar, Blanco, Brown, Burnet, Callahan and 37 more | 23 min |
| Mar 28, 9:28 PM CDT | Severe Thunderstorm Watch | SPC | Atascosa, Bandera, Bell, Bexar, Blanco, Bosque and 78 more | 8 hr |
| Mar 28, 10:21 PM CDT | Severe Thunderstorm Watch | SPC | Archer, Baylor, Clay, Wichita, Wilbarger | 7 hr |
| Mar 28, 10:25 PM CDT | Mesoscale Discussion | SPC | Archer, Clay, Cooke, Montague, Wichita | 65 min |
| Mar 28, 11:58 PM CDT | Mesoscale Discussion | SPC | Anderson, Bastrop, Bell, Bexar, Blanco, Bosque and 29 more | 92 min |
| Mar 29, 2:54 AM CDT | Mesoscale Discussion | SPC | Collin, Delta, Fannin, Franklin, Grayson, Hopkins and 7 more | 96 min |
| Mar 29, 8:23 AM CDT | Mesoscale Discussion | SPC | Brazoria, Calhoun, Chambers, Fort Bend, Galveston, Hardin and 12 more | 67 min |
| Mar 29, 4:17 PM CDT | Tornado Watch | SPC | Bowie, Cass, Morris | 8 hr |
Nearby
Tornado Watches in Louisiana, 2017Tornado Watches in Texas, 2017Every tornado 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.