Alert archive / Louisiana / Tornado Watches in 2015
Tornado Watch 219
The Storm Prediction Center issued this tornado watch at May 25, 2015, 10:37 PM CDT for 38 parishes in Louisiana; 20 counties in Mississippi. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- May 25, 2015, 10:37 PM CDT (03:37 UTC)
- Expired
- May 26, 2015, 5:00 AM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
All 58 counties
Ascension Parish, LA, Assumption Parish, LA, Avoyelles Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, East Baton Rouge Parish, LA, East Carroll 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, Morehouse Parish, LA, Orleans Parish, LA, Plaquemines Parish, LA, Pointe Coupee Parish, LA, Richland 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 Carroll Parish, LA, West Feliciana Parish, LA, Adams County, MS, Amite County, MS, Claiborne County, MS, Copiah County, MS, Franklin County, MS, Hancock County, MS, Harrison County, MS, Issaquena County, MS, Jackson County, MS, Jefferson County, MS, Jefferson Davis County, MS, Lamar County, MS, Lawrence County, MS, Lincoln County, MS, Marion County, MS, Pearl River County, MS, Pike 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
- 30%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 60%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 20%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 90%
Warnings issued inside it
18 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 25, 10:40 PM CDT | Severe Thunderstorm Warning | JAN | Franklin, Morehouse, Richland, West Carroll | 65 min |
| May 25, 11:15 PM CDT | Severe Thunderstorm Warning | JAN | Catahoula, Franklin | 45 min |
| May 25, 11:29 PM CDT | Severe Thunderstorm Warning | LCH | Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Cameron and 4 more | 91 min |
| May 25, 11:36 PM CDT | Severe Thunderstorm Warning | JAN | Madison, Tensas | 39 min |
| May 25, 11:42 PM CDT | Severe Thunderstorm Warning | JAN | Concordia | 48 min |
| May 26, 12:12 AM CDT | Severe Thunderstorm Warning | JAN | Madison, Tensas | 78 min |
| May 26, 12:16 AM CDT | Severe Thunderstorm Warning | JAN | Adams, Franklin, Jefferson | 59 min |
| May 26, 12:22 AM CDT | Flash Flood Warning | JAN | Concordia | 3 hr |
| May 26, 12:23 AM CDT | Severe Thunderstorm Warning | LIX | Iberville, Pointe Coupee | 52 min |
| May 26, 12:54 AM CDT | Severe Thunderstorm Warning | JAN | Claiborne, Copiah, Hinds, Jefferson | 51 min |
| May 26, 1:08 AM CDT | Severe Thunderstorm Warning | LIX | East Feliciana, West Feliciana | 52 min |
| May 26, 1:11 AM CDT | Tornado Warning | LIX | Jefferson | 34 min |
| May 26, 1:30 AM CDT | Tornado Warning | LIX | Amite, Wilkinson | 30 min |
| May 26, 1:59 AM CDT | Severe Thunderstorm Warning | LIX | East Baton Rouge, East Feliciana, Livingston, Saint Helena, Tangipahoa | 46 min |
| May 26, 2:45 AM CDT | Severe Thunderstorm Warning | LIX | Livingston, Saint Helena, Saint Tammany, Tangipahoa, Washington | 45 min |
| May 26, 4:01 AM CDT | Severe Thunderstorm Warning | LIX | Jefferson, Orleans, Plaquemines, Saint Bernard, Saint Charles | 44 min |
| May 26, 4:23 AM CDT | Severe Thunderstorm Warning | LIX | Orleans, Saint Tammany | 37 min |
| May 26, 4:43 AM CDT | Severe Thunderstorm Warning | LIX | Jefferson, Orleans, Plaquemines, Saint Bernard | 47 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, 3.6 hours before the alert went out and 67 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
- 693 J/kg
- Mixed-layer CIN
- -75 J/kg
- Mixed-layer LCL
- 967 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 37 m²/s²
- 0-3 km storm-relative helicity
- 77 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.9
The text
As transmitted, in the capitals the NWS used until 2016.
089 WWUS20 KWNS 260335 SEL9 SPC WW 260335 LAZ000-MSZ000-CWZ000-261000- URGENT - IMMEDIATE BROADCAST REQUESTED TORNADO WATCH NUMBER 219 NWS STORM PREDICTION CENTER NORMAN OK 1035 PM CDT MON MAY 25 2015 THE NWS STORM PREDICTION CENTER HAS ISSUED A * TORNADO WATCH FOR PORTIONS OF EASTERN LOUISIANA SOUTHWEST AND SOUTHERN MISSISSIPPI COASTAL WATERS * EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 1035 PM UNTIL 500 AM CDT. * PRIMARY THREATS INCLUDE... A COUPLE TORNADOES POSSIBLE SCATTERED DAMAGING WIND GUSTS TO 70 MPH LIKELY ISOLATED LARGE HAIL EVENTS TO 1 INCH IN DIAMETER POSSIBLE SUMMARY...CENTRAL LA SQUALL LINE SHOULD CONTINUE ESE WITH A CONTINUED RISK FOR LOCALLY DAMAGING WIND AND ISOLATED TORNADOES. AN ISOLATED TORNADO AND DAMAGING WIND RISK ALSO MAY ACCOMPANY ISOLATED STORMS FORMING AHEAD OF LINE OVER SE LA/SW MS. THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 110 STATUTE MILES NORTH AND SOUTH OF A LINE FROM 45 MILES SOUTH SOUTHEAST OF GULFPORT MISSISSIPPI TO 55 MILES WEST SOUTHWEST OF NATCHEZ MISSISSIPPI. 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. && OTHER WATCH INFORMATION...CONTINUE...WW 214...WW 215...WW 216...WW 217...WW 218... AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 600. MEAN STORM MOTION VECTOR 23025. ...CORFIDI
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 25, 8:05 PM CDT | Mesoscale Discussion | SPC | Acadia, Allen, Beauregard, Bienville, Bossier, Caddo and 17 more | 85 min |
| May 25, 10:14 PM CDT | Mesoscale Discussion | SPC | Acadia, Ascension, Assumption, Avoyelles, Catahoula, Concordia and 22 more | 91 min |
| May 25, 11:13 PM CDT | Mesoscale Discussion | SPC | Allen, Beauregard, Calcasieu, Cameron, Evangeline, Jefferson Davis and 1 more | 92 min |
| May 25, 11:57 PM CDT | Mesoscale Discussion | SPC | Acadia, Ascension, Assumption, Avoyelles, Concordia, East Baton Rouge and 27 more | 93 min |
| May 26, 3:50 AM CDT | Mesoscale Discussion | SPC | Jefferson, Lafourche, Orleans, Plaquemines, Saint Bernard, Saint Charles and 4 more | 85 min |
| May 26, 6:22 PM CDT | Mesoscale Discussion | SPC | Bienville, Bossier, Caddo, Caldwell, Catahoula, Claiborne and 15 more | 83 min |
| May 25, 8:52 PM CDT | Mesoscale Discussion | SPC | Bolivar, Coahoma, DeSoto, Quitman, Tate, Tunica | 83 min |
Nearby
Tornado Watches in Louisiana, 2015Tornado Watches in Mississippi, 2015Every tornado watch in 2015
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.