Alert archive / Louisiana / Tornado Watches in 2019
Tornado Watch 82
The Storm Prediction Center issued this tornado watch at Apr 18, 2019, 10:35 AM CDT for 37 parishes in Louisiana; 20 counties in Mississippi. It was in force for 8 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 18, 2019, 10:35 AM CDT (15:35 UTC)
- Expired
- Apr 18, 2019, 7:00 PM CDT
- In force
- 8 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 65 kt
All 57 counties
Acadia Parish, LA, Allen Parish, LA, Ascension Parish, LA, Assumption Parish, LA, Avoyelles Parish, LA, Cameron Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, East Baton Rouge Parish, LA, East Carroll Parish, LA, East Feliciana Parish, LA, Evangeline Parish, LA, Franklin Parish, LA, Iberia Parish, LA, Iberville Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, Lafourche Parish, LA, Livingston Parish, LA, Madison Parish, LA, Pointe Coupee Parish, LA, Rapides Parish, LA, Richland Parish, LA, Saint Charles Parish, LA, Saint Helena Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Landry Parish, LA, Saint Martin Parish, LA, St. Mary Parish, LA, Tangipahoa Parish, LA, Tensas Parish, LA, Terrebonne Parish, LA, Vermilion Parish, LA, West Baton Rouge Parish, LA, West Carroll Parish, LA, West Feliciana Parish, LA, Adams County, MS, Amite County, MS, Claiborne County, MS, Copiah County, MS, Franklin County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Jefferson County, MS, Lawrence County, MS, Lincoln County, MS, Madison County, MS, Pike County, MS, Rankin County, MS, Sharkey County, MS, Simpson County, MS, Warren County, MS, Wilkinson County, MS, Yazoo County, MS
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 60%
- One or more EF2 to EF5 tornadoes
- 40%
- Ten or more severe wind reports
- 80%
- One or more gusts of 65 knots or more
- 40%
- 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
- 95%
Warnings issued inside it
35 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 18, 11:00 AM CDT | Severe Thunderstorm Warning | LCH | Acadia, Allen, Avoyelles, Evangeline, Rapides, Saint Landry | 45 min |
| Apr 18, 11:06 AM CDT | Tornado Warning | LCH | Avoyelles, Evangeline, Saint Landry | 24 min |
| Apr 18, 11:49 AM CDT | Severe Thunderstorm Warning | JAN | Catahoula, Concordia, Franklin | 56 min |
| Apr 18, 12:02 PM CDT | Flash Flood Warning | LCH | Acadia, Evangeline, Jefferson Davis, Saint Landry | 3 hr |
| Apr 18, 12:03 PM CDT | Severe Thunderstorm Warning | LCH | Acadia, Avoyelles, Lafayette, Saint Landry | 42 min |
| Apr 18, 12:22 PM CDT | Severe Thunderstorm Warning | LIX | Ascension, East Baton Rouge, Iberville, West Baton Rouge | 22 min |
| Apr 18, 12:30 PM CDT | Severe Thunderstorm Warning | JAN | Catahoula, Concordia, Franklin, Tensas | 60 min |
| Apr 18, 12:35 PM CDT | Tornado Warning | JAN | Concordia | 31 min |
| Apr 18, 12:35 PM CDT | Flash Flood Warning | LCH | Avoyelles | 2 hr |
| Apr 18, 12:45 PM CDT | Severe Thunderstorm Warning | LIX | Pointe Coupee, West Feliciana | 30 min |
| Apr 18, 12:47 PM CDT | Severe Thunderstorm Warning | LIX | Ascension, Livingston, Tangipahoa | 26 min |
| Apr 18, 1:01 PM CDT | Severe Thunderstorm Warning | JAN | Madison | 74 min |
| Apr 18, 1:13 PM CDT | Tornado Warning | JAN | Claiborne, Jefferson | 46 min |
| Apr 18, 1:22 PM CDT | Flash Flood Warning | LIX | Pointe Coupee, West Feliciana | 3 hr |
| Apr 18, 1:22 PM CDT | Severe Thunderstorm Warning | LIX | East Feliciana, Saint Helena, West Feliciana | 53 min |
| Apr 18, 1:38 PM CDT | Severe Thunderstorm Warning | JAN | Copiah, Hinds, Warren | 82 min |
| Apr 18, 1:41 PM CDT | Tornado Warning | LIX | East Feliciana | 34 min |
| Apr 18, 1:43 PM CDT | Severe Thunderstorm Warning | JAN | Lincoln | 77 min |
| Apr 18, 1:43 PM CDT | Tornado Warning | JAN | Copiah, Hinds | 62 min |
| Apr 18, 1:57 PM CDT | Flash Flood Warning | LCH | Lafayette, Saint Landry, Saint Martin | 3 hr |
| Apr 18, 1:57 PM CDT | Tornado Warning | JAN | Franklin, Lincoln | 63 min |
| Apr 18, 2:07 PM CDT | Severe Thunderstorm Warning | LIX | Amite, Pike | 23 min |
| Apr 18, 2:11 PM CDT | Flash Flood Warning | JAN | Hinds, Issaquena, Madison, Warren | 3 hr |
| Apr 18, 2:12 PM CDT | Tornado Warning | LIX | Amite, Pike | 33 min |
| Apr 18, 2:16 PM CDT | Severe Thunderstorm Warning | JAN | Madison, Rankin, Simpson | 74 min |
| Apr 18, 2:26 PM CDT | Tornado Warning | JAN | Lawrence, Lincoln | 49 min |
| Apr 18, 2:30 PM CDT | Severe Thunderstorm Warning | JAN | Jefferson Davis, Lawrence, Marion | 75 min |
| Apr 18, 2:37 PM CDT | Tornado Warning | JAN | Hinds, Madison, Rankin | 53 min |
| Apr 18, 2:40 PM CDT | Tornado Warning | JAN | Rankin, Simpson | 65 min |
| Apr 18, 3:09 PM CDT | Severe Thunderstorm Warning | LIX | Livingston, Saint Helena, Tangipahoa, Washington | 36 min |
| Apr 18, 3:21 PM CDT | Flash Flood Warning | JAN | Leake, Madison, Rankin, Scott | 3 hr |
| Apr 18, 3:26 PM CDT | Tornado Warning | JAN | Leake, Madison, Rankin, Scott | 64 min |
| Apr 18, 3:28 PM CDT | Severe Thunderstorm Warning | JAN | Leake, Madison, Neshoba, Rankin | 77 min |
| Apr 18, 3:31 PM CDT | Tornado Warning | LIX | Tangipahoa, Washington | 29 min |
| Apr 18, 3:44 PM CDT | Tornado Warning | LIX | Tangipahoa, Washington | 31 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, 3.6 hours before the alert went out and 174 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
- 1465 J/kg
- Mixed-layer CIN
- -17 J/kg
- Mixed-layer LCL
- 507 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 204 m²/s²
- 0-3 km storm-relative helicity
- 152 m²/s²
- Significant tornado parameter
- 1.6
- Supercell composite
- 11.5
The text
As transmitted.
850
WWUS20 KWNS 181533
SEL2
SPC WW 181533
LAZ000-MSZ000-CWZ000-190000-
URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 82
NWS Storm Prediction Center Norman OK
1035 AM CDT Thu Apr 18 2019
The NWS Storm Prediction Center has issued a
* Tornado Watch for portions of
Louisiana
Western Mississippi
Coastal Waters
* Effective this Thursday morning and evening from 1035 AM until
700 PM CDT.
* Primary threats include...
A few tornadoes likely with a couple intense tornadoes possible
Widespread damaging winds likely with isolated significant gusts
to 75 mph possible
Isolated large hail events to 1.5 inches in diameter possible
SUMMARY...Clusters of strong thunderstorms are expected to intensify
by early afternoon and spread east-northeast across the Lower
Mississippi Valley. Tornadoes and damaging winds are the primary
hazards.
The tornado watch area is approximately along and 65 statute miles
east and west of a line from 20 miles southeast of Intracoastal City
LA to 95 miles north northeast of Natchez MS. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU2).
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 1.5 inches. Extreme turbulence and surface wind
gusts to 65 knots. A few cumulonimbi with maximum tops to 500. Mean
storm motion vector 21030.
...GramsSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 18, 12:54 AM CDT | Mesoscale Discussion | SPC | Bienville, Bossier, Caddo, De Soto, Natchitoches, Red River and 2 more | 66 min |
| Apr 18, 1:09 AM CDT | Severe Thunderstorm Watch | SPC | Bossier, Caddo, De Soto, Sabine, Webster | 7 hr |
| Apr 18, 3:51 AM CDT | Mesoscale Discussion | SPC | Beauregard, Bienville, Bossier, Caddo, Claiborne, De Soto and 12 more | 114 min |
| Apr 18, 6:36 AM CDT | Mesoscale Discussion | SPC | Acadia, Allen, Beauregard, Bienville, Calcasieu, Cameron and 9 more | 84 min |
| Apr 18, 9:50 AM CDT | Mesoscale Discussion | SPC | Acadia, Allen, Ascension, Assumption, Avoyelles, Cameron and 25 more | 85 min |
| Apr 18, 12:42 PM CDT | Mesoscale Discussion | SPC | Ascension, East Baton Rouge, Livingston, Orleans, Saint Charles, Saint Helena and 5 more | 2 hr |
| Apr 18, 1:41 PM CDT | Tornado Watch | SPC | Jefferson, Orleans, Plaquemines, Saint Bernard, Saint Tammany, Washington | 7 hr |
| Apr 18, 2:46 PM CDT | Mesoscale Discussion | SPC | Ascension, Assumption, East Baton Rouge, Iberville, Lafourche, Livingston and 10 more | 89 min |
Nearby
Tornado Watches in Louisiana, 2019Tornado Watches in Mississippi, 2019Every tornado watch in 2019
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.