Alert archive / Louisiana / Severe Thunderstorm Watches in 2016
Severe Thunderstorm Watch 115
The Storm Prediction Center issued this severe thunderstorm watch at Apr 27, 2016, 7:54 AM CDT for 35 parishes in Louisiana; 26 counties in Mississippi. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 27, 2016, 7:54 AM CDT (12:54 UTC)
- Expired
- Apr 27, 2016, 3:00 PM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 65 kt
All 61 counties
Acadia Parish, LA, Ascension Parish, LA, Assumption Parish, LA, Avoyelles Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Franklin Parish, LA, Iberia Parish, LA, Iberville Parish, LA, Jefferson Parish, LA, Lafayette Parish, LA, Lafourche Parish, LA, Livingston Parish, LA, Madison 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, Tensas Parish, LA, Terrebonne Parish, LA, Vermilion Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Adams County, MS, Amite County, MS, Claiborne County, MS, Copiah County, MS, Covington County, MS, Forrest County, MS, Franklin County, MS, Hancock County, MS, Hinds County, MS, Jasper County, MS, Jefferson 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, Pike County, MS, Rankin County, MS, Scott County, MS, Simpson County, MS, Smith County, MS, Walthall County, MS, Warren 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
- 20%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 60%
- 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
- 80%
Warnings issued inside it
2 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 27, 8:38 AM CDT | Severe Thunderstorm Warning | LCH | Acadia, Cameron, Jefferson Davis, Lafayette, Vermilion | 52 min |
| Apr 27, 9:29 AM CDT | Severe Thunderstorm Warning | LCH | Iberia, St. Mary, Vermilion | 39 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, 0.9 hours before the alert went out and 209 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
- 1558 J/kg
- Mixed-layer CIN
- -190 J/kg
- Mixed-layer LCL
- 749 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 217 m²/s²
- 0-3 km storm-relative helicity
- 356 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 4.3
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 26, 9:36 PM CDT | Mesoscale Discussion | SPC | Bossier, Caddo | 114 min |
| Apr 26, 10:21 PM CDT | Severe Thunderstorm Watch | SPC | Bossier, Caddo, De Soto, Red River, Sabine, Webster | 9 hr |
| Apr 27, 1:35 AM CDT | Mesoscale Discussion | SPC | Bienville, Bossier, Caddo, Claiborne, De Soto, Lincoln and 3 more | 115 min |
| Apr 27, 4:28 AM CDT | Mesoscale Discussion | SPC | Beauregard, Natchitoches, Red River, Sabine, Vernon | 92 min |
| Apr 27, 4:56 AM CDT | Severe Thunderstorm Watch | SPC | Allen, Beauregard, Calcasieu, Cameron, De Soto, Evangeline and 9 more | 5 hr |
| Apr 27, 7:30 AM CDT | Mesoscale Discussion | SPC | Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Caldwell and 19 more | 2 hr |
| Apr 27, 1:34 PM CDT | Mesoscale Discussion | SPC | Attala, Calhoun, Chickasaw, Choctaw, Clarke, Clay and 32 more | 2 hr |
| Apr 27, 3:28 PM CDT | Mesoscale Discussion | SPC | Tishomingo | 2 hr |
Nearby
Severe Thunderstorm Watches in Louisiana, 2016Severe Thunderstorm Watches in Mississippi, 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.