Alert archive / Louisiana / Tornado Watches in 2023
Tornado Watch 711
The Storm Prediction Center issued this tornado watch at Nov 20, 2023, 12:45 PM CST for 5 counties in Arkansas; 36 parishes in Louisiana; 23 counties in Texas. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Nov 20, 2023, 12:45 PM CST (18:45 UTC)
- Expired
- Nov 20, 2023, 7:00 PM CST
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 64 counties
Ashley County, AR, Chicot County, AR, Columbia County, AR, Lafayette County, AR, Union County, AR, Acadia Parish, LA, Allen Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Calcasieu Parish, LA, Caldwell Parish, LA, Catahoula Parish, LA, Claiborne Parish, LA, Concordia Parish, LA, De Soto Parish, LA, East Carroll Parish, LA, Evangeline Parish, LA, Franklin Parish, LA, Grant Parish, LA, Jackson Parish, LA, Jefferson Davis Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Rapides Parish, LA, Red River Parish, LA, Richland Parish, LA, Sabine Parish, LA, Saint Landry Parish, LA, Tensas Parish, LA, Union Parish, LA, Vernon Parish, LA, Webster Parish, LA, West Carroll Parish, LA, Winn Parish, LA, Angelina County, TX, Cherokee County, TX, Gregg County, TX, Hardin County, TX, Harrison County, TX, Houston County, TX, Jasper County, TX, Liberty County, TX, Marion 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
The radar
The Shreveport radar (KSHV), 69 km from the middle of the area, began a volume at 18:44 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
- 70%
- One or more EF2 to EF5 tornadoes
- 50%
- Ten or more severe wind reports
- 50%
- One or more gusts of 65 knots or more
- 20%
- 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
25 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 20, 1:47 PM CST | Severe Thunderstorm Warning | LCH | Vernon | 28 min |
| Nov 20, 2:10 PM CST | Tornado Warning | SHV | Winn | 50 min |
| Nov 20, 2:14 PM CST | Severe Thunderstorm Warning | SHV | Grant, Natchitoches | 46 min |
| Nov 20, 2:17 PM CST | Severe Thunderstorm Warning | LCH | Vernon | 28 min |
| Nov 20, 2:25 PM CST | Tornado Warning | SHV | Grant, Natchitoches | 35 min |
| Nov 20, 2:26 PM CST | Tornado Warning | LCH | Rapides, Vernon | 34 min |
| Nov 20, 2:59 PM CST | Tornado Warning | SHV | Grant, LaSalle | 61 min |
| Nov 20, 3:02 PM CST | Severe Thunderstorm Warning | LCH | Vernon | 31 min |
| Nov 20, 3:42 PM CST | Severe Thunderstorm Warning | JAN | Catahoula, Concordia, Tensas | 63 min |
| Nov 20, 3:48 PM CST | Severe Thunderstorm Warning | LCH | Beauregard, Vernon | 57 min |
| Nov 20, 3:51 PM CST | Flash Flood Warning | LCH | Vernon | 3 hr |
| Nov 20, 4:07 PM CST | Severe Thunderstorm Warning | JAN | Madison | 53 min |
| Nov 20, 4:18 PM CST | Severe Thunderstorm Warning | LCH | Rapides, Vernon | 42 min |
| Nov 20, 4:23 PM CST | Tornado Warning | SHV | Grant, LaSalle | 37 min |
| Nov 20, 4:25 PM CST | Severe Thunderstorm Warning | LCH | Vernon | 65 min |
| Nov 20, 4:26 PM CST | Tornado Warning | JAN | Concordia, Tensas | 64 min |
| Nov 20, 4:44 PM CST | Severe Thunderstorm Warning | SHV | Grant, LaSalle | 46 min |
| Nov 20, 4:50 PM CST | Severe Thunderstorm Warning | LCH | Rapides | 55 min |
| Nov 20, 4:53 PM CST | Tornado Warning | LCH | Rapides | 18 min |
| Nov 20, 5:12 PM CST | Tornado Warning | LCH | Rapides, Vernon | 33 min |
| Nov 20, 5:28 PM CST | Severe Thunderstorm Warning | SHV | Grant, LaSalle | 47 min |
| Nov 20, 5:41 PM CST | Severe Thunderstorm Warning | LCH | Avoyelles, Evangeline, Rapides | 64 min |
| Nov 20, 5:55 PM CST | Flash Flood Warning | JAN | Concordia, Tensas | 2 hr |
| Nov 20, 6:15 PM CST | Tornado Warning | LCH | Avoyelles, Rapides | 15 min |
| Nov 20, 6:29 PM CST | Severe Thunderstorm Warning | LCH | Avoyelles, Rapides | 61 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, 6.8 hours before the alert went out and 73 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 770 m above ground
- 0-6 km bulk shear
- 62 kt
- 0-1 km storm-relative helicity
- 366 m²/s²
- 0-3 km storm-relative helicity
- 313 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.2
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 20, 7:11 AM CST | Mesoscale Discussion | SPC | Clark, Dallas, Garland, Hempstead, Hot Spring, Howard and 9 more | 2 hr |
| Nov 20, 11:56 AM CST | Mesoscale Discussion | SPC | Allen, Beauregard, Bienville, Bossier, Caddo, Calcasieu and 15 more | 2 hr |
| Nov 20, 2:35 PM CST | Mesoscale Discussion | SPC | Allen, Beauregard, Bienville, Calcasieu, Cameron, De Soto and 11 more | 85 min |
| Nov 20, 3:14 PM CST | Mesoscale Discussion | SPC | East Baton Rouge, East Feliciana, Livingston, Pointe Coupee, Saint Helena, Tangipahoa and 3 more | 2 hr |
| Nov 20, 3:52 PM CST | Tornado Watch | SPC | East Baton Rouge, East Feliciana, Livingston, Pointe Coupee, Saint Helena, Saint Tammany and 4 more | 9 hr |
| Nov 20, 5:23 PM CST | Mesoscale Discussion | SPC | Allen, Avoyelles, Beauregard, Catahoula, Concordia, Evangeline and 5 more | 97 min |
Nearby
Tornado Watches in Louisiana, 2023Tornado Watches in Texas, 2023Tornado Watches in Arkansas, 2023Every tornado watch in 2023
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.