Alert archive / Louisiana / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 83, NWS New Orleans, LA

April 11, 1997Saint Charles Parish, Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at Apr 11, 1997, 10:45 AM CDT for Saint Charles Parish, Louisiana. It was in force for 45 min. 1 report 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, 10:45 AM CDT (15:45 UTC)
Expired: Apr 11, 1997, 11:30 AM CDT
In force: 45 min
Issued by: NWS New Orleans, LA
Area: Whole counties

County Saint Charles Parish, LA

What was reported inside it

Time	Report	Where	Remark
Apr 11, 11:30 AM CDT	Thunderstorm Wind	Boutte, 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, 3.8 hours before the alert went out and 270 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 111546 RRA
SVRNEW
LAC089-111630-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1045 AM CDT FRI APR 11 1997
 
THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1130 AM CDT
FOR RESIDENTS IN THE FOLLOWING LOCATION...
 
IN SOUTHEAST LOUISIANA
 
   ...ST. CHARLES PARISH
 
AND THE ADJACENT COASTAL WATERS
 
 
AT 1040 AM NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE
THUNDERSTORM WARNING IN THE VICINTIY OF THIBODAUX EXTENDING TO RACELAND.
THUNDERSTORMS WERE MOVING NORTHEAST AROUND 35 MILES AN HOUR. COMMUNITIES
IN THE PATH OF THIS THUNDERSTORM INCLUDE DES ALLEMANDS...HAHNVILLE AND
DESTRAHAN
 
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 nSO
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, 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, 12:17 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

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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.