Alert archive / Louisiana / Tornado Warnings in 2001

Tornado Warning 47, NWS New Orleans, LA

October 11, 2001Plaquemines Parish, Saint Bernard Parish, Louisiana

NWS New Orleans, LA issued this tornado warning at Oct 11, 2001, 6:09 PM CDT for Plaquemines Parish, Saint Bernard Parish, Louisiana. It was in force for 36 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued: Oct 11, 2001, 6:09 PM CDT (23:09 UTC)
Expired: Oct 11, 2001, 6:45 PM CDT
In force: 36 min
Issued by: NWS New Orleans, LA
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Plaquemines Parish, LA, Saint Bernard Parish, LA

The watch it was issued in

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

Issued	Product	Office	Lasted
Oct 11, 6:00 PM CDT	Tornado Watch	SPC	4 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 11.2 hours before the alert went out and 57 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: 619 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 599 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 96 m²/s²
0-3 km storm-relative helicity: 171 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

564 
WFUS54 KLIX 112311
TORNEW
LAC075-087-112345-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
609 PM CDT THU OCT 11 2001

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHERN PLAQUEMINES PARISH IN SOUTHEAST LOUISIANA
  ST. BERNARD PARISH IN SOUTHEAST LOUISIANA

* UNTIL 645 PM CDT

* AT 610 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A 
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 5 MILES SOUTHWEST 
OF DELACROIX...MOVING NORTHEAST AT 20 MPH.

THE COMMUNITIES OF DELACROIX...VERRET AND ALLUVIAL CITY ARE IN THE 
PATH OF THIS STORM.

SEEK SHELTER ON THE LOWEST FLOOR OF A BUILDING IN AN INTERIOR HALLWAY
OR ROOM SUCH AS A CLOSET OR BATHROOM.

REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY
WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST
OFFICE.

LAT...LON 2969 9001 2956 8987 2984 8946 2997 8973

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 11, 4:16 PM CDT	Tornado Warning	LIX	Livingston, Tangipahoa	29 min
Oct 11, 5:09 PM CDT	Tornado Warning	LIX	Jefferson, Plaquemines	36 min
Oct 11, 5:41 PM CDT	Tornado Warning	LIX	Plaquemines	34 min
Oct 11, 5:51 PM CDT	Special Marine Warning	LIX		84 min
Oct 11, 6:43 PM CDT	Tornado Warning	LIX	Saint Bernard	32 min

Nearby

Tornado Warnings in Louisiana, 2001 Every tornado warning in 2001 Tornadoes in 2001

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.