Alert archive / Louisiana / Tornado Watches in 2020
Tornado Watch 8
The Storm Prediction Center issued this tornado watch at Jan 11, 2020, 12:28 AM CST for 30 parishes in Louisiana; 7 counties in Texas. It was in force for 8 hr.
The area
The outline as issued.
The facts
- Issued
- Jan 11, 2020, 12:28 AM CST (06:28 UTC)
- Expired
- Jan 11, 2020, 8:00 AM CST
- In force
- 8 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 70 kt
All 37 counties
Acadia Parish, LA, Allen Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Bienville Parish, LA, Calcasieu Parish, LA, Caldwell Parish, LA, Cameron Parish, LA, Claiborne Parish, LA, Evangeline Parish, LA, Grant Parish, LA, Iberia Parish, LA, Jackson Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Rapides Parish, LA, Red River Parish, LA, Sabine Parish, LA, Saint Landry Parish, LA, Saint Martin Parish, LA, St. Mary Parish, LA, Union Parish, LA, Vermilion Parish, LA, Vernon Parish, LA, Webster Parish, LA, Winn Parish, LA, Hardin County, TX, Jasper County, TX, Jefferson County, TX, Newton County, TX, Orange County, TX, Sabine County, TX, Tyler County, TX
The radar
The Ft Polk radar (KPOE), 67 km from the middle of the area, began a volume at 06:29 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
- 40%
- Ten or more severe wind reports
- 80%
- One or more gusts of 65 knots or more
- 60%
- Ten or more severe hail reports
- 20%
- One or more hailstones of 2 inches or more
- 10%
- Six or more combined severe hail and wind reports
- 90%
Warnings issued inside it
21 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 11, 12:50 AM CST | Severe Thunderstorm Warning | LCH | Jasper, Tyler | 40 min |
| Jan 11, 1:00 AM CST | Severe Thunderstorm Warning | SHV | De Soto, Red River, Sabine | 45 min |
| Jan 11, 1:09 AM CST | Severe Thunderstorm Warning | LCH | Hardin, Jasper, Jefferson, Tyler | 21 min |
| Jan 11, 1:27 AM CST | Tornado Warning | SHV | Bossier, Webster | 28 min |
| Jan 11, 1:30 AM CST | Severe Thunderstorm Warning | SHV | Bienville, Bossier, Claiborne, De Soto, Lincoln, Natchitoches and 3 more | 60 min |
| Jan 11, 1:31 AM CST | Severe Thunderstorm Warning | LCH | Hardin, Jasper, Jefferson, Newton, Orange, Tyler | 59 min |
| Jan 11, 1:39 AM CST | Severe Thunderstorm Warning | SHV | De Soto, Natchitoches, Red River, Sabine | 66 min |
| Jan 11, 1:48 AM CST | Tornado Warning | SHV | Bienville, Claiborne, Webster | 27 min |
| Jan 11, 2:16 AM CST | Severe Thunderstorm Warning | LCH | Beauregard, Calcasieu, Cameron, Vernon | 59 min |
| Jan 11, 2:16 AM CST | Severe Thunderstorm Warning | SHV | Jackson, Lincoln, Ouachita, Union | 59 min |
| Jan 11, 2:34 AM CST | Tornado Warning | SHV | Union | 41 min |
| Jan 11, 3:05 AM CST | Tornado Warning | LCH | Beauregard | 25 min |
| Jan 11, 3:12 AM CST | Tornado Warning | LCH | Calcasieu | 33 min |
| Jan 11, 3:14 AM CST | Severe Thunderstorm Warning | LCH | Allen, Beauregard, Calcasieu, Cameron, Jefferson Davis, Rapides and 1 more | 61 min |
| Jan 11, 3:24 AM CST | Severe Thunderstorm Warning | SHV | Caldwell, Jackson, Lincoln, Ouachita, Union, Winn | 51 min |
| Jan 11, 3:43 AM CST | Severe Thunderstorm Warning | SHV | Caldwell, Grant, LaSalle, Winn | 62 min |
| Jan 11, 3:53 AM CST | Tornado Warning | LCH | Calcasieu, Cameron, Jefferson Davis | 52 min |
| Jan 11, 4:17 AM CST | Severe Thunderstorm Warning | LCH | Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Cameron and 7 more | 58 min |
| Jan 11, 4:42 AM CST | Severe Thunderstorm Warning | SHV | Caldwell, Grant, LaSalle | 33 min |
| Jan 11, 5:13 AM CST | Severe Thunderstorm Warning | LCH | Acadia, Avoyelles, Evangeline, Iberia, Lafayette, Rapides and 3 more | 62 min |
| Jan 11, 6:13 AM CST | Severe Thunderstorm Warning | LCH | Avoyelles, Saint Landry, Saint Martin | 32 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 00:00Z, 6.5 hours before the alert went out and 143 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
- 703 J/kg
- Mixed-layer CIN
- -35 J/kg
- Mixed-layer LCL
- 813 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- 379 m²/s²
- 0-3 km storm-relative helicity
- 620 m²/s²
- Significant tornado parameter
- 1.6
- Supercell composite
- 6.1
The text
As transmitted.
651
WWUS20 KWNS 110626
SEL8
SPC WW 110626
LAZ000-TXZ000-CWZ000-111400-
URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 8
NWS Storm Prediction Center Norman OK
1230 AM CST Sat Jan 11 2020
The NWS Storm Prediction Center has issued a
* Tornado Watch for portions of
Western and central Louisiana
Far southeast Texas
Coastal Waters
* Effective this Saturday morning from 1230 AM until 800 AM CST.
* Primary threats include...
A few tornadoes likely with a couple intense tornadoes possible
Widespread damaging winds and isolated significant gusts to 80
mph likely
Isolated large hail events to 1.5 inches in diameter possible
SUMMARY...Elongated squall line will progress east across the Sabine
Valley through western to central Louisiana early this morning with
a couple supercells possible ahead of the line. Damaging winds and
embedded tornadoes are anticipated.
The tornado watch area is approximately along and 65 statute miles
east and west of a line from 60 miles northwest of Monroe LA to 50
miles south southeast of Lake Charles 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.
&&
OTHER WATCH INFORMATION...CONTINUE...WW 5...WW 6...WW 7...
AVIATION...Tornadoes and a few severe thunderstorms with hail
surface and aloft to 1.5 inches. Extreme turbulence and surface wind
gusts to 70 knots. A few cumulonimbi with maximum tops to 500. Mean
storm motion vector 23045.
...GramsSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 10, 7:30 PM CST | Mesoscale Discussion | SPC | Bossier, Caddo, Webster | 2 hr |
| Jan 10, 10:40 PM CST | Mesoscale Discussion | SPC | Bienville, Bossier, Caddo, Claiborne, De Soto, Lincoln and 2 more | 2 hr |
| Jan 11, 12:21 AM CST | Mesoscale Discussion | SPC | Acadia, Allen, Beauregard, Calcasieu, Cameron, Evangeline and 11 more | 99 min |
| Jan 11, 1:19 AM CST | Mesoscale Discussion | SPC | Bienville, Caldwell, Claiborne, De Soto, Jackson, Lincoln and 7 more | 86 min |
| Jan 11, 2:22 AM CST | Mesoscale Discussion | SPC | Catahoula, Concordia, East Carroll, Franklin, Madison, Richland and 2 more | 53 min |
| Jan 11, 2:37 AM CST | Tornado Watch | SPC | Catahoula, Concordia, East Carroll, Franklin, Madison, Morehouse and 3 more | 8 hr |
| Jan 11, 4:31 AM CST | Mesoscale Discussion | SPC | Acadia, Ascension, Avoyelles, Caldwell, Catahoula, Concordia and 21 more | 59 min |
| Jan 11, 5:18 AM CST | Tornado Watch | SPC | Ascension, Assumption, East Baton Rouge, East Feliciana, Iberville, Jefferson and 16 more | 7 hr |
| Jan 11, 7:39 AM CST | Mesoscale Discussion | SPC | Ascension, Assumption, Jefferson, Lafourche, Livingston, Orleans and 8 more | 96 min |
| Jan 10, 6:30 PM CST | Mesoscale Discussion | SPC | Atascosa, Bandera, Bastrop, Bexar, Blanco, Burnet and 16 more | 2 hr |
| Jan 10, 8:49 PM CST | Mesoscale Discussion | SPC | Angelina, Austin, Brazoria, Brazos, Burleson, Chambers and 25 more | 116 min |
| Jan 10, 9:09 PM CST | Tornado Watch | SPC | Austin, Brazoria, Brazos, Burleson, Chambers, Colorado and 17 more | 5 hr |
| Jan 11, 7:34 AM CST | Mesoscale Discussion | SPC | Cooke, Denton, Fannin, Grayson | 116 min |
Nearby
Tornado Watches in Louisiana, 2020Tornado Watches in Texas, 2020Every tornado watch in 2020
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.