Alert archive / Louisiana / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 87, NWS New Orleans, LA

April 11, 1997Orleans Parish, Plaquemines Parish, Saint Bernard Parish, Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at Apr 11, 1997, 12:17 PM CDT for Orleans Parish, Plaquemines Parish, Saint Bernard Parish, Louisiana. It was in force for 43 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Apr 11, 1997, 12:17 PM CDT (17:17 UTC)
Expired: Apr 11, 1997, 1:00 PM CDT
In force: 43 min
Issued by: NWS New Orleans, LA
Area: Whole counties

Counties Orleans Parish, LA, 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
Apr 11, 10:15 AM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 5.3 hours before the alert went out and 278 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 111718 RRA
SVRNEW
LAC071-075-087-111800-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1217 PM CDT FRI APR 11 1997
 
THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  100 PM CDT
FOR RESIDENTS IN THE FOLLOWING LOCATIONS...
 
IN SOUTHEAST LOUISIANA
 
   ...EASTERN ORLEANS PARISH...SOUTHERN PLAQUEMINES PARISH
   ...ST. BERNARD PARISH
 
AND THE ADJACENT COASTAL WATERS
 
AT 1215 PM DOPPLER RADAR INDICATED A LINE OF SEVERE THUNDERSTORMS
EXTENDING FROM EAST NEW ORLEANS ACROSS CHALMETTE TO JUST WEST OF POINT A
LA HACHE. THE LINE OF THUNDERSTORMS WAS MOVING EAST AT 35 MILES AN HOUR.
COMMUNITIES IN THE PATH OF THE THUNDERSTORMS INCLUDE VENETION ISLES...
DELACROIX AND POINT A LA HACHE.
 
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55
MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN.
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR
OF YOUR HOME OR BUSINESS.  HEAVY RAINS FLOOD ROADS QUICKLY SO
DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.

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, 11:49 AM CDT	Tornado Warning	LIX	Saint Tammany, Tangipahoa	26 min
Apr 11, 12:12 PM CDT	Tornado Warning	LIX	Saint Tammany, Tangipahoa	33 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

Severe Thunderstorm Warnings in Louisiana, 1997 Every severe thunderstorm warning 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; the sounding from the Mesonet's radiosonde archive.