Alert archive / Louisiana / Tornado Watches in 2017
Tornado Watch 33
The Storm Prediction Center issued this tornado watch at Feb 14, 2017, 9:38 AM CST for 11 parishes in Louisiana; 11 counties in Texas. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Feb 14, 2017, 9:38 AM CST (15:38 UTC)
- Expired
- Feb 14, 2017, 3:00 PM CST
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
All 22 counties
Acadia Parish, LA, Allen Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Cameron Parish, LA, Evangeline Parish, LA, Jefferson Davis Parish, LA, Natchitoches Parish, LA, Sabine Parish, LA, Vermilion Parish, LA, Vernon Parish, LA, Angelina County, TX, Hardin County, TX, Jasper County, TX, Jefferson County, TX, Nacogdoches County, TX, Newton County, TX, Orange County, TX, Sabine County, TX, San Augustine County, TX, Shelby County, TX, Tyler County, TX
The radar
The Lake Charles radar (KLCH), 82 km from the middle of the area, began a volume at 15:40 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
- 10%
- Six or more combined severe hail and wind reports
- 60%
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, 3.6 hours before the alert went out and 83 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
- 22 J/kg
- Mixed-layer CIN
- -294 J/kg
- Mixed-layer LCL
- 644 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 137 m²/s²
- 0-3 km storm-relative helicity
- 227 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
173 WWUS20 KWNS 141535 SEL3 SPC WW 141535 LAZ000-TXZ000-CWZ000-142100- URGENT - IMMEDIATE BROADCAST REQUESTED Tornado Watch Number 33 NWS Storm Prediction Center Norman OK 940 AM CST Tue Feb 14 2017 The NWS Storm Prediction Center has issued a * Tornado Watch for portions of Southwest Louisiana Southeast Texas Coastal Waters * Effective this Tuesday morning and afternoon from 940 AM until 300 PM CST. * Primary threats include... A couple tornadoes possible Isolated damaging wind gusts to 70 mph possible Isolated large hail events to 1 inch in diameter possible SUMMARY...A line of strong to severe thunderstorms will track across the watch area late this morning and early afternoon, posing a risk of damaging winds and a tornado or two. The tornado watch area is approximately along and 90 statute miles north and south of a line from 50 miles northwest of Port Arthur TX to 50 miles east northeast of Lake Charles LA. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU3). 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 32... AVIATION...Tornadoes and a few severe thunderstorms with hail surface and aloft to 1 inch. Extreme turbulence and surface wind gusts to 60 knots. A few cumulonimbi with maximum tops to 450. Mean storm motion vector 25030. ...Hart
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 14, 7:21 AM CST | Mesoscale Discussion | SPC | Acadia, Allen, Beauregard, Calcasieu, Cameron, Evangeline and 3 more | 114 min |
| Feb 14, 11:15 AM CST | Mesoscale Discussion | SPC | Acadia, Allen, Beauregard, Calcasieu, Cameron, Jefferson Davis and 2 more | 90 min |
| Feb 14, 2:02 PM CST | Mesoscale Discussion | SPC | Ascension, Assumption, Avoyelles, Catahoula, Concordia, East Baton Rouge and 20 more | 2 hr |
| Feb 13, 8:24 PM CST | Mesoscale Discussion | SPC | Bandera, Kerr, Llano, McCulloch, Mason, San Saba | 96 min |
| Feb 14, 3:57 AM CST | Mesoscale Discussion | SPC | Atascosa, Austin, Bee, Bexar, Brazoria, Colorado and 16 more | 3 hr |
| Feb 14, 5:09 AM CST | Tornado Watch | SPC | Aransas, Austin, Bee, Brazoria, Calhoun, Chambers and 24 more | 6 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.