Alert archive / Louisiana / Tornado Warnings in 2011

Tornado Warning 159, NWS New Orleans, LA

November 16, 2011Saint Helena Parish, Tangipahoa Parish, Louisiana

NWS New Orleans, LA issued this tornado warning at Nov 16, 2011, 2:28 AM CST for Saint Helena Parish, Tangipahoa Parish, Louisiana. It was in force for 47 min. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Nov 16, 2011, 2:28 AM CST (08:28 UTC)
Expired: Nov 16, 2011, 3:15 AM CST
In force: 47 min
Issued by: NWS New Orleans, LA
Area: Storm-based polygon

Counties Saint Helena Parish, LA, Tangipahoa Parish, LA

What was reported inside it

Time	Report	Where	Remark
Nov 16, 2:40 AM CST	TORNADO 1	5 Ne Greensburg, LA	TORNADO BEGAN ABOUT 5 MILES NORTHEAST OF GREENSBURG. TRACK LENGTH WAS HALF A MILE LONG WITH A WIDTH OF 150 YARDS. ESTIMATED MAX WINDS ARE AROUND 105 MPH. DAMAGE TO ONE RESIDENCE WHICHWAS BLOWN 10 FEET OFF FOUNDATION. ALSO HAD COLLAPSE OF ONE EXTERIOR WALL. SCA
Nov 16, 3:14 AM CST	TORNADO	1 W Tangipahoa, LA	PUBLIC REPORTS OF TORNADO TOUCH DOWN NEAR I-55 EXIT 57 NEAR THE TOWN OF TANGIPAHOA AND E. PECKERWOODS ROAD. OAK TREES DOWNED ACROSS THE ROAD, TRAMPOLINE BLOWN AWAY AND OTHER INDICATIONS OF TORNADO DAMAGE IN THE AREA.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Nov 16, 2:20 AM CST	Tornado Watch	SPC	8 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 8.5 hours before the alert went out and 105 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: 1734 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 661 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 116 m²/s²
0-3 km storm-relative helicity: 166 m²/s²
Significant tornado parameter: 1.4
Supercell composite: 8.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

116 
WFUS54 KLIX 160828
TORLIX
LAC091-105-160915-
/O.NEW.KLIX.TO.W.0159.111116T0828Z-111116T0915Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
228 AM CST WED NOV 16 2011

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A

* TORNADO WARNING FOR...
  EASTERN ST. HELENA PARISH IN SOUTHEAST LOUISIANA...
  THIS INCLUDES THE CITY OF GREENSBURG...
  NORTHWESTERN TANGIPAHOA PARISH IN SOUTHEAST LOUISIANA...

* UNTIL 315 AM CST

* AT 224 AM CST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR
  GREENSBURG...MOVING NORTHEAST AT 35 MPH.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

THE SAFEST PLACE TO BE DURING A TORNADO IS UNDER A WORKBENCH OR OTHER
PIECE OF STURDY FURNITURE. SEEK SHELTER ON THE LOWEST FLOOR OF THE
BUILDING IN AN INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE
BLANKETS OR PILLOWS TO COVER YOUR BODY AND ALWAYS STAY AWAY FROM
WINDOWS.

IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A
SUBSTANTIAL SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE
NEAREST DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 AM CST WEDNESDAY MORNING
FOR SOUTHEAST LOUISIANA AND SOUTHERN MISSISSIPPI.

&&

LAT...LON 3099 9034 3090 9035 3073 9066 3080 9075
      3100 9056 3100 9036
TIME...MOT...LOC 0827Z 228DEG 32KT 3079 9066

$$

2 follow-up statements

335 
WWUS54 KLIX 160850
SVSLIX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
250 AM CST WED NOV 16 2011

LAC091-160901-
/O.CAN.KLIX.TO.W.0159.000000T0000Z-111116T0915Z/
ST. HELENA LA-
250 AM CST WED NOV 16 2011

...THE TORNADO WARNING FOR EASTERN ST. HELENA PARISH IS CANCELLED...

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 AM CST WEDNESDAY MORNING
FOR SOUTHEAST LOUISIANA AND SOUTHERN MISSISSIPPI. A TORNADO WATCH
ALSO REMAINS IN EFFECT UNTIL 1000 AM CST WEDNESDAY MORNING FOR
SOUTHEAST LOUISIANA AND SOUTHERN MISSISSIPPI.

LAT...LON 3099 9035 3093 9035 3085 9057 3099 9057
      3100 9056 3100 9043 3100 9036
TIME...MOT...LOC 0851Z 227DEG 25KT 3092 9051

$$

LAC105-160915-
/O.CON.KLIX.TO.W.0159.000000T0000Z-111116T0915Z/
TANGIPAHOA LA-
250 AM CST WED NOV 16 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 315 AM CST FOR
NORTHWESTERN TANGIPAHOA PARISH...

AT 247 AM CST...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO
DETECT A TORNADO.  THIS TORNADO WAS LOCATED NEAR TANGIPAHOA...OR 10
MILES NORTHEAST OF GREENSBURG...MOVING NORTHEAST AT 30 MPH.

THE TORNADO WILL OTHERWISE REMAIN OVER MAINLY RURAL AREAS OF THE
INDICATED PARISH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THE SAFEST PLACE TO BE DURING A TORNADO IS UNDER A WORKBENCH OR OTHER
PIECE OF STURDY FURNITURE. SEEK SHELTER ON THE LOWEST FLOOR OF THE
BUILDING IN AN INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE
BLANKETS OR PILLOWS TO COVER YOUR BODY AND ALWAYS STAY AWAY FROM
WINDOWS.

IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A
SUBSTANTIAL SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE
NEAREST DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 AM CST WEDNESDAY MORNING
FOR SOUTHEAST LOUISIANA AND SOUTHERN MISSISSIPPI. A TORNADO WATCH
ALSO REMAINS IN EFFECT UNTIL 1000 AM CST WEDNESDAY MORNING FOR
SOUTHEAST LOUISIANA AND SOUTHERN MISSISSIPPI.

&&

LAT...LON 3099 9035 3093 9035 3085 9057 3099 9057
      3100 9056 3100 9043 3100 9036
TIME...MOT...LOC 0851Z 227DEG 25KT 3092 9051

$$

441 
WWUS54 KLIX 160912
SVSLIX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
312 AM CST WED NOV 16 2011

LAC105-160922-
/O.EXP.KLIX.TO.W.0159.000000T0000Z-111116T0915Z/
TANGIPAHOA LA-
312 AM CST WED NOV 16 2011

...THE TORNADO WARNING FOR NORTHWESTERN TANGIPAHOA PARISH WILL EXPIRE
AT 315 AM CST...

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 AM CST WEDNESDAY MORNING
FOR SOUTHERN MISSISSIPPI. A TORNADO WATCH ALSO REMAINS IN EFFECT
UNTIL 1000 AM CST WEDNESDAY MORNING FOR SOUTHEAST LOUISIANA AND
SOUTHERN MISSISSIPPI.

LAT...LON 3099 9035 3093 9035 3085 9057 3099 9057
      3100 9056 3100 9043 3100 9036
TIME...MOT...LOC 0912Z 227DEG 25KT 3102 9039

$$

The office that day

Everything else NWS New Orleans, LA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Nov 16, 2:38 AM CST	Special Marine Warning	LIX		52 min
Nov 16, 3:33 AM CST	Tornado Warning	LIX	Livingston, Saint Helena, Tangipahoa	42 min
Nov 16, 4:09 AM CST	Tornado Warning	LIX	Washington	36 min
Nov 16, 4:18 AM CST	Tornado Warning	LIX	Jefferson, Saint Charles	42 min
Nov 16, 4:52 AM CST	Tornado Warning	LIX	Lafourche, Terrebonne	23 min
Nov 16, 4:53 AM CST	Tornado Warning	LIX	Jefferson, Orleans, Saint Charles	37 min
Nov 16, 4:57 AM CST	Special Marine Warning	LIX		48 min
Nov 16, 5:21 AM CST	Tornado Warning	LIX	Lafourche, Saint Charles	39 min
Nov 16, 5:37 AM CST	Special Marine Warning	LIX		23 min
Nov 16, 6:15 AM CST	Severe Thunderstorm Warning	LIX	Saint Tammany	60 min
Nov 16, 7:22 AM CST	Severe Thunderstorm Warning	LIX	Jefferson, Lafourche, Plaquemines	68 min
Nov 16, 7:41 AM CST	Special Marine Warning	LIX		2 hr
Nov 16, 10:29 AM CST	Special Marine Warning	LIX		61 min
Nov 16, 10:30 AM CST	Special Marine Warning	LIX		90 min
Nov 16, 10:31 AM CST	Small Craft Advisory	LIX		46 hr

Nearby

Tornado Warnings in Louisiana, 2011 Every tornado warning in 2011 Tornadoes in 2011

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive.