Alert archive / Louisiana / Tornado Warnings in 1997

Tornado Warning 3, NWS New Orleans, LA

April 11, 1997Saint Tammany Parish, Tangipahoa Parish, Louisiana

NWS New Orleans, LA issued this tornado warning at Apr 11, 1997, 11:49 AM CDT for Saint Tammany Parish, Tangipahoa Parish, Louisiana. It was in force for 26 min. 3 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Apr 11, 1997, 11:49 AM CDT (16:49 UTC)
Expired: Apr 11, 1997, 12:15 PM CDT
In force: 26 min
Issued by: NWS New Orleans, LA
Area: Whole counties

Counties Saint Tammany Parish, LA, Tangipahoa Parish, LA

What was reported inside it

Time	Report	Where
Apr 11, 11:55 AM CDT	Tornado F0	Ponchatoula, LA
Apr 11, 12:10 PM CDT	Thunderstorm Wind	Ponchatoula, LA
Apr 11, 12:15 PM CDT	Thunderstorm Wind	Covington, LA

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The watch it was issued in

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

Issued	Product	Office	Lasted
Apr 11, 10:15 AM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 4.8 hours before the alert went out and 201 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1830 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 210 m²/s²
0-3 km storm-relative helicity: 354 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.

000 
TTAA00 KNEW 111650 RRA
TORNEW
LAC103-105-111715-
 
BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1149 AM CDT FRI APR 11 1997
 
THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A
TORNADO WARNING EFFECTIVE UNTIL 1215 PM CDT
FOR RESIDENTS IN THE FOLLOWING LOCATIONS...
 
IN SOUTHEAST LOUISIANA
 
   ...WESTERN ST. TAMMANY PARISH...SOUTHERN TANGIPAHOA PARISH
 
AT 1145 AM NATIONAL WEATHER SERVICE RADAR INDICATED A TORNADO LIKELY
DEVELOPING FROM A SEVERE THUNDERSTORM IN THE VICINITY OF MANCHAC IN
EXTREME SOUTH TANGIPAHOA PARISH. THE SEVERE THUNDERSTORM WAS MOVING
NORTHEAST AT 35 MILES AH HOUR. COMMUNTIES IN THE PATH OF THE SEVERE
THUNDERSTORM PRODUCING THE TORNADO INCLUDE MANCHAC...MADISONVILLE
...COVINGTON.
 
THIS IS A DANGEROUS STORM SITUATION.  ACT QUICKLY.  IF YOU ARE
IN THE PATH OF THIS TORNADO MOVE TO A SHELTER BELOW GROUND IF
AVAILABLE.  OTHERWISE...GO TO A SMALL INTERIOR ROOM ON THE LOWEST
FLOOR POSSIBLE.  :AVOID WINDOWS.  ABANDON CARS AND MOBILE HOMES
FOR A REINFORCED BUILDING OR GET INTO A DITCH OR CULVERT.

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 11, 9:29 AM CDT	Severe Thunderstorm Warning	LIX	Assumption, Lafourche, Saint James	46 min
Apr 11, 9:36 AM CDT	Severe Thunderstorm Warning	LIX	Terrebonne	69 min
Apr 11, 10:14 AM CDT	Severe Thunderstorm Warning	LIX	Lafourche, Saint James, Saint John the Baptist	46 min
Apr 11, 10:27 AM CDT	Severe Thunderstorm Warning	LIX	Lafourche	48 min
Apr 11, 10:45 AM CDT	Severe Thunderstorm Warning	LIX	Saint Charles	45 min
Apr 11, 11:00 AM CDT	Flash Flood Warning	LIX	Assumption	4 hr
Apr 11, 11:09 AM CDT	Severe Thunderstorm Warning	LIX	Jefferson, Orleans, Plaquemines	66 min
Apr 11, 11:09 AM CDT	Severe Thunderstorm Warning	LIX	Saint Bernard	66 min
Apr 11, 11:26 AM CDT	Tornado Warning	LIX	Jefferson, Lafourche	34 min
Apr 11, 11:31 AM CDT	Severe Thunderstorm Warning	LIX	Tangipahoa	44 min
Apr 11, 12:12 PM CDT	Tornado Warning	LIX	Saint Tammany, Tangipahoa	33 min
Apr 11, 12:17 PM CDT	Severe Thunderstorm Warning	LIX	Orleans, Plaquemines, Saint Bernard	43 min
Apr 11, 12:32 PM CDT	Severe Thunderstorm Warning	LIX	Washington	43 min
Apr 11, 12:59 PM CDT	Severe Thunderstorm Warning	LIX	Plaquemines, Saint Bernard	46 min

Nearby

Tornado Warnings in Louisiana, 1997 Every tornado warning in 1997 Tornadoes in 1997

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.