Alert archive / Louisiana / Tornado Watches in 2022
Tornado Watch 49
The Storm Prediction Center issued this tornado watch at Mar 17, 2022, 11:42 PM CDT for 29 parishes in Louisiana; 5 counties in Mississippi. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 17, 2022, 11:42 PM CDT (04:42 UTC)
- Expired
- Mar 18, 2022, 7:00 AM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 34 counties
Acadia Parish, LA, Allen Parish, LA, Ascension Parish, LA, Assumption Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Cameron Parish, LA, Concordia Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Evangeline Parish, LA, Iberia Parish, LA, Iberville Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, Livingston Parish, LA, Pointe Coupee Parish, LA, Rapides Parish, LA, Saint Helena Parish, LA, Saint James Parish, LA, Saint Landry Parish, LA, Saint Martin Parish, LA, St. Mary Parish, LA, Tangipahoa Parish, LA, Vermilion Parish, LA, Vernon Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Adams County, MS, Amite County, MS, Franklin County, MS, Pike County, MS, Wilkinson County, MS
The radar
The Ft Polk radar (KPOE), 85 km from the middle of the area, began a volume at 04:45 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
- 80%
- 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
1 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 18, 5:05 AM CDT | Severe Thunderstorm Warning | LIX | Saint Helena, Tangipahoa, Washington | 25 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 00:00Z, 4.7 hours before the alert went out and 111 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
- 428 J/kg
- Mixed-layer CIN
- -168 J/kg
- Mixed-layer LCL
- 754 m above ground
- 0-6 km bulk shear
- 51 kt
- 0-1 km storm-relative helicity
- 225 m²/s²
- 0-3 km storm-relative helicity
- 273 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.0
The text
As transmitted.
537
WWUS20 KWNS 180438
SEL9
SPC WW 180438
LAZ000-MSZ000-CWZ000-181200-
URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 49
NWS Storm Prediction Center Norman OK
1140 PM CDT Thu Mar 17 2022
The NWS Storm Prediction Center has issued a
* Tornado Watch for portions of
Southern Louisiana
Southwest Mississippi
Coastal Waters
* Effective this Thursday night and Friday morning from 1140 PM
until 700 AM CDT.
* Primary threats include...
Several tornadoes likely with a couple intense tornadoes
possible
Scattered large hail and isolated very large hail events to 2
inches in diameter possible
Scattered damaging wind gusts to 70 mph possible
SUMMARY...Thunderstorms are expected to intensify overnight and
spread across much of southern Louisiana. Strengthening winds aloft
and increasing moisture will pose a risk of supercell storms capable
of tornadoes. A strong tornado or two is possible.
The tornado watch area is approximately along and 60 statute miles
north and south of a line from 20 miles northwest of Lake Charles LA
to 25 miles south of Mc Comb MS. For a complete depiction of the
watch see the associated watch outline update (WOUS64 KWNS WOU9).
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 500. Mean
storm motion vector 22035.
...HartSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 17, 8:30 PM CDT | Mesoscale Discussion | SPC | Bienville, Bossier, Caddo, Claiborne, De Soto, Lincoln and 4 more | 2 hr |
| Mar 17, 10:47 PM CDT | Mesoscale Discussion | SPC | Acadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 19 more | 3 hr |
| Mar 18, 1:40 AM CDT | Mesoscale Discussion | SPC | East Baton Rouge, Evangeline, Pointe Coupee, Saint Landry, West Baton Rouge, West Feliciana | 95 min |
| Mar 18, 3:12 AM CDT | Mesoscale Discussion | SPC | Ascension, East Baton Rouge, East Feliciana, Iberville, Livingston, Pointe Coupee and 7 more | 2 hr |
| Mar 18, 3:55 AM CDT | Tornado Watch | SPC | Saint Tammany, Washington | 8 hr |
| Mar 18, 5:48 AM CDT | Mesoscale Discussion | SPC | Washington | 87 min |
| Mar 18, 7:16 AM CDT | Mesoscale Discussion | SPC | Forrest, George, Greene, Hancock, Harrison, Jackson and 4 more | 89 min |
Nearby
Tornado Watches in Louisiana, 2022Tornado Watches in Mississippi, 2022Every tornado watch in 2022
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.