Alert archive / Louisiana / Tornado Watches in 2019

Tornado Watch 102

April 25, 201932 parishes in Louisiana; 27 counties in Mississippi

The Storm Prediction Center issued this tornado watch at Apr 25, 2019, 8:06 AM CDT for 32 parishes in Louisiana; 27 counties in Mississippi. It was in force for 8 hr.

The area

The outline as issued.

The facts

Issued: Apr 25, 2019, 8:06 AM CDT (13:06 UTC)
Expired: Apr 25, 2019, 3:42 PM CDT
In force: 8 hr
Issued by: the Storm Prediction Center
Largest hail expected: 1 in
Strongest gust expected: 60 kt

All 59 counties

Acadia Parish, LA, Ascension Parish, LA, Assumption Parish, LA, Avoyelles Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Evangeline Parish, LA, Iberia Parish, LA, Iberville Parish, LA, Jefferson Davis Parish, LA, Jefferson Parish, LA, Lafayette Parish, LA, Lafourche Parish, LA, Livingston Parish, LA, Orleans Parish, LA, Plaquemines Parish, LA, Pointe Coupee Parish, LA, Saint Bernard 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, 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, West Feliciana Parish, LA, Amite County, MS, Clarke County, MS, Copiah County, MS, Covington County, MS, Forrest County, MS, Franklin County, MS, George County, MS, Greene County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Jasper County, MS, Jefferson Davis County, MS, Jones County, MS, Lamar County, MS, Lawrence County, MS, Lincoln County, MS, Marion County, MS, Pearl River County, MS, Perry County, MS, Pike County, MS, Simpson County, MS, Smith County, MS, Stone County, MS, Walthall County, MS, Wayne County, MS, Wilkinson County, MS

What SPC expected

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

Two or more tornadoes: 40%
One or more EF2 to EF5 tornadoes: 20%
Ten or more severe wind reports: 40%
One or more gusts of 65 knots or more: 20%
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: 60%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Apr 25, 8:06 AM CDT	Severe Thunderstorm Warning	LIX	Pointe Coupee, West Feliciana	54 min
Apr 25, 9:16 AM CDT	Tornado Warning	LIX	Saint Charles, Saint John the Baptist	27 min
Apr 25, 9:36 AM CDT	Severe Thunderstorm Warning	LIX	Saint Charles	39 min
Apr 25, 9:36 AM CDT	Severe Thunderstorm Warning	JAN	Neshoba, Newton, Scott, Smith	10 min
Apr 25, 9:56 AM CDT	Severe Thunderstorm Warning	LIX	Jefferson, Orleans	49 min
Apr 25, 10:08 AM CDT	Severe Thunderstorm Warning	LIX	Jefferson, Orleans, Plaquemines, Saint Charles	67 min
Apr 25, 10:21 AM CDT	Severe Thunderstorm Warning	LIX	Orleans, Saint Bernard	69 min
Apr 25, 11:25 AM CDT	Tornado Warning	LIX	Hancock, Harrison	35 min
Apr 25, 12:12 PM CDT	Severe Thunderstorm Warning	MOB	George, Stone	48 min
Apr 25, 12:44 PM CDT	Severe Thunderstorm Warning	MOB	George, Greene	46 min
Apr 25, 1:18 PM CDT	Severe Thunderstorm Warning	LIX	Ascension, Assumption, Iberville, Saint James	27 min
Apr 25, 1:27 PM CDT	Tornado Warning	LIX	Ascension, Saint James	16 min
Apr 25, 1:46 PM CDT	Severe Thunderstorm Warning	LIX	Ascension, Saint James, Saint John the Baptist	29 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 12:00Z, 1.1 hours before the alert went out and 99 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 392 J/kg
Mixed-layer CIN: -121 J/kg
Mixed-layer LCL: 762 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 205 m²/s²
0-3 km storm-relative helicity: 232 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 3.7

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 24, 7:35 PM CDT	Mesoscale Discussion	SPC	Vernon	85 min
Apr 24, 11:19 PM CDT	Mesoscale Discussion	SPC	Beauregard, Natchitoches, Sabine, Vernon	86 min
Apr 24, 11:52 PM CDT	Tornado Watch	SPC	Acadia, Allen, Avoyelles, Beauregard, Bienville, Calcasieu and 19 more	8 hr
Apr 24, 11:57 PM CDT	Mesoscale Discussion	SPC	Bienville, Bossier, Claiborne, De Soto, Natchitoches, Red River and 2 more	63 min
Apr 25, 2:08 AM CDT	Mesoscale Discussion	SPC	Acadia, Allen, Avoyelles, Beauregard, Bienville, Bossier and 24 more	67 min
Apr 25, 2:43 AM CDT	Severe Thunderstorm Watch	SPC	Catahoula, Concordia, East Carroll, Franklin, Madison, Morehouse and 3 more	6 hr
Apr 25, 5:02 AM CDT	Mesoscale Discussion	SPC	Catahoula, Concordia, East Carroll, Franklin, Madison, Richland and 2 more	58 min
Apr 25, 5:24 AM CDT	Mesoscale Discussion	SPC	Acadia, Allen, Beauregard, Calcasieu, Evangeline, Grant and 7 more	66 min
Apr 25, 7:10 AM CDT	Mesoscale Discussion	SPC	Acadia, Ascension, Assumption, East Baton Rouge, East Feliciana, Iberia and 22 more	2 hr
Apr 25, 11:48 AM CDT	Mesoscale Discussion	SPC	Ascension, Assumption, East Baton Rouge, East Feliciana, Iberia, Iberville and 17 more	117 min
Apr 25, 3:14 PM CDT	Mesoscale Discussion	SPC	Jefferson, Plaquemines, Saint Bernard	2 hr

Nearby

Tornado Watches in Louisiana, 2019 Tornado Watches in Mississippi, 2019 Every 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.