Alert archive / Louisiana / Severe Thunderstorm Watches in 2016

Severe Thunderstorm Watch 183

May 19, 201624 parishes in Louisiana

The Storm Prediction Center issued this severe thunderstorm watch at May 19, 2016, 8:10 PM CDT for 24 parishes in Louisiana. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
May 19, 2016, 8:10 PM CDT (01:10 UTC)
Expired
May 20, 2016, 2:00 AM CDT
In force
6 hr
Issued by
the Storm Prediction Center
Largest hail expected
1 in
Strongest gust expected
65 kt
All 24 counties

Acadia Parish, LA, Ascension Parish, LA, Assumption Parish, LA, East Baton Rouge Parish, LA, Iberia Parish, LA, Iberville Parish, LA, Jefferson Parish, LA, Lafayette Parish, LA, Lafourche Parish, LA, Livingston Parish, LA, Orleans Parish, LA, Plaquemines Parish, LA, Saint Bernard Parish, LA, Saint Charles Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Martin Parish, LA, Saint Tammany Parish, LA, St. Mary Parish, LA, Tangipahoa Parish, LA, Terrebonne Parish, LA, Vermilion Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA

What SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes
20%
One or more EF2 to EF5 tornadoes
10%
Ten or more severe wind reports
40%
One or more gusts of 65 knots or more
30%
Ten or more severe hail reports
5%
One or more hailstones of 2 inches or more
5%
Six or more combined severe hail and wind reports
70%

Warnings issued inside it

19 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
May 19, 8:17 PM CDTSevere Thunderstorm WarningLCHAcadia, Iberia, Lafayette, Saint Landry, Saint Martin, St. Mary and 1 more28 min
May 19, 8:37 PM CDTSevere Thunderstorm WarningLIXIberville, West Baton Rouge23 min
May 19, 8:45 PM CDTSevere Thunderstorm WarningLCHAcadia, Iberia, Lafayette, Saint Landry, Saint Martin, St. Mary and 1 more60 min
May 19, 9:03 PM CDTSevere Thunderstorm WarningLIXIberville, Pointe Coupee, West Baton Rouge57 min
May 19, 9:11 PM CDTSevere Thunderstorm WarningLIXAssumption, Lafourche, Terrebonne64 min
May 19, 9:45 PM CDTTornado WarningLIXAssumption30 min
May 19, 9:50 PM CDTSevere Thunderstorm WarningLIXAscension, East Baton Rouge, East Feliciana, Iberville, Livingston, Pointe Coupee and 1 more55 min
May 19, 9:57 PM CDTTornado WarningLIXAscension, Assumption, Saint James33 min
May 19, 10:01 PM CDTSevere Thunderstorm WarningLIXAscension, Assumption, Lafourche, Saint Charles, Saint James, Saint John the Baptist and 1 more59 min
May 19, 10:12 PM CDTTornado WarningLIXEast Baton Rouge, Livingston33 min
May 19, 10:22 PM CDTSevere Thunderstorm WarningLIXAscension, East Baton Rouge, East Feliciana, Livingston, Saint Helena, Saint John the Baptist and 1 more53 min
May 19, 10:32 PM CDTTornado WarningLIXSaint John the Baptist13 min
May 19, 10:35 PM CDTSevere Thunderstorm WarningLIXJefferson, Lafourche, Orleans, Plaquemines, Saint Bernard, Saint Charles and 1 more25 min
May 19, 10:49 PM CDTSevere Thunderstorm WarningLIXSaint Tammany, Tangipahoa56 min
May 19, 10:57 PM CDTTornado WarningLIXSaint Tammany18 min
May 19, 11:01 PM CDTTornado WarningLIXPlaquemines, Saint Bernard29 min
May 19, 11:11 PM CDTSevere Thunderstorm WarningLIXJefferson, Lafourche, Orleans, Plaquemines, Saint Bernard34 min
May 19, 11:18 PM CDTSevere Thunderstorm WarningLIXWashington42 min
May 19, 11:20 PM CDTTornado WarningLIXPlaquemines, Saint Bernard25 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

Slidell Radar S, LA (KSIL), launched 00:00Z, 1.2 hours before the alert went out and 132 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.

Skew-T log-pSkew-T log-p diagram, Slidell Radar S, LA at 00:00Z on 2016-05-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Slidell Radar S, LA at 00:00Z on 2016-05-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -6 square meters per square second.1939Sfc1 km3 km6 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2145 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
-6 m²/s²
0-3 km storm-relative helicity
48 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 19, 7:53 PM CDTMesoscale DiscussionSPCAssumption, Iberia, Jefferson, Lafourche, Plaquemines, Saint Charles and 2 more67 min
May 19, 10:22 PM CDTMesoscale DiscussionSPCAscension, Assumption, East Baton Rouge, Jefferson, Lafourche, Livingston and 10 more83 min

Nearby

Severe Thunderstorm Watches in Louisiana, 2016Every severe thunderstorm watch in 2016

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.