Alert archive / Louisiana / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 166, NWS New Orleans, LA

May 28, 1997Lafourche Parish, Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at May 28, 1997, 5:27 PM CDT for Lafourche Parish, Louisiana. It was in force for 33 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
May 28, 1997, 5:27 PM CDT (22:27 UTC)
Expired
May 28, 1997, 6:00 PM CDT
In force
33 min
Issued by
NWS New Orleans, LA
Area
Whole counties

County Lafourche Parish, LA

What was reported inside it

TimeReportWhereRemark
May 28, 5:58 PM CDTHail 0.88Galliano, 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.

IssuedProductOfficeLasted
May 28, 1:30 PM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 10.5 hours before the alert went out and 107 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-pSkew-T log-p diagram, Slidell Radar S, LA at 12:00Z on 1997-05-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 570 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Slidell Radar S, LA at 12:00Z on 1997-05-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 19 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
570 J/kg
Mixed-layer CIN
-154 J/kg
Mixed-layer LCL
1200 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
19 m²/s²
0-3 km storm-relative helicity
23 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

The text

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

947 
WUUS1 KNEW 282230 RRA
SVRNEW
LAC057-LAZ502-282300-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM AND SPECIAL MARINE WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
527 PM CDT WED MAY 28 1997
 
THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A
SEVERE THUNDERSTORM AND SPECIAL MARINE WARNING
EFFECTIVE UNTIL  600 PM CDT FOR RESIDENTS IN THE FOLLOWING LOCATION...
 
IN SOUTHEAST LOUISIANA
 
   ...EASTERN LAFOURCHE PARISH
 
  AND FOR MARINE INTERESTS IN THE COASTAL WATERS AROUND...
 
  ...BARATARIA BAY
 
AT 525 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM NEAR LITTLE LAKE
OR 8 MILES EAST OF LAROSE. THIS STORM WAS NEARLY STATIONARY AND IS
LIKELY PRODUCING LARGE HAIL. GALE FORCE GUSTS ARE ALSO POSSIBLE ON THE
AREA LAKES NEAR THIS STORM.
 
 
THIS IS A DANGEROUS STORM.  IF YOU ARE IN ITS PATH YOU SHOULD
PREPARE FOR DAMAGING WIND IN EXCESS OF 55 MPH...LARGE HAIL...AND
DEADLY LIGHTNING.  PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT STAY AWAY FROM WINDOWS.

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, May 28, 11:48 AM CDT, 5 hours 39 minutes before
LAZ034>040-046>049-056>070-MSZ068>071-080>082-291200-

THUNDERSTORM OUTLOOK
NATIONAL WEATHER SERVICE NEW ORLEANS/BATON ROUGE LA
1150 AM CDT WED MAY 28 1997

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS IN EAST CENTRAL...
SOUTHEAST LOUISIANA AND SOUTH MISSISSIPPI THIS AFTERNOON.
THIS ACTIVITY WILL CONTINUE INTO THE NIGHT WITH THE APPROACH OF A
COLD FRONT THAT SHOULD REACH CENTRAL LOUISIANA AFTER MIDNIGHT.

VERY WARM..HUMID AND UNSTABLE CONDITIONS CONTINUE OVER THE AREA TODAY.
UPPER AIR SOUNDINGS.. WHEN MODIFIED FOR AFTERNOON HEATING...INDICATE
ADDITIONAL INSTABILITY. THIS CONDITION WILL LEAD TO THE POSSIBILITY
OF ISOLATED SEVERE THUNDERSTORMS WITH LOCALLY HEAVY RAINFALL AND STRONG
GUSTY WINDS THIS AFTERNOON AND TONIGHT.
Special weather statement, May 28, 11:50 AM CDT, 5 hours 37 minutes before
LAZ034>040-046>049-056>070-MSZ068>071-080>082-291200-

THUNDERSTORM OUTLOOK
NATIONAL WEATHER SERVICE NEW ORLEANS/BATON ROUGE LA
1150 AM CDT WED MAY 28 1997

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS IN EAST CENTRAL...
SOUTHEAST LOUISIANA AND SOUTH MISSISSIPPI THIS AFTERNOON.
THIS ACTIVITY WILL CONTINUE INTO THE NIGHT WITH THE APPROACH OF A
COLD FRONT THAT SHOULD REACH CENTRAL LOUISIANA AFTER MIDNIGHT.

VERY WARM..HUMID AND UNSTABLE CONDITIONS CONTINUE OVER THE AREA TODAY.
UPPER AIR SOUNDINGS.. WHEN MODIFIED FOR AFTERNOON HEATING...INDICATE
ADDITIONAL INSTABILITY. THIS CONDITION WILL LEAD TO THE POSSIBILITY
OF ISOLATED SEVERE THUNDERSTORMS WITH LOCALLY HEAVY RAINFALL AND STRONG
GUSTY WINDS THIS AFTERNOON AND TONIGHT.
Local storm report, May 28, 4:32 PM CDT, 55 minutes before
PRELIMINARY LOCAL STORM REPORTS
NATIONAL WEATHER SERVICE NEW ORLEANS LA
428 PM CDT WED MAY  28 1997

TIME(CDT)  .....CITY LOCATION...... STATE ...EVENT/REMARKS...
           ....COUNTY LOCATION......

0320 PM    WIGGINS                   MS   .88 INCH HAIL
05/28/97   PEARL RIVER                    REPORTED BY SHERIFFS OFFICE.

0320 PM    PICAYUNE                  MS   .75 INCH HAIL
05/28/97   PEARL RIVER                    REPORTED BY NWS EMPLOYEE.

0332 PM    CONVENT                   LA   1.50 INCH HAIL
05/28/97   ST. JAMES                      PING PONG BALL SIZE REPORTED
                                          BY SHERIFFS OFFICE.

0342 PM    CARRIERE                  MS   TORNADO
05/28/97   PEARL RIVER                    REPORTED BY SHERIFFS DEPUTY.
0347 PM    2 N PICAYUNE              MS   TORNADO
05/28/97   PEARL RIVER                    POWER LINES DOWN. REPORTED BY
                                          SHERIFFS OFFICE.

24

The office that day

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

IssuedProductOfficeCountiesLasted
May 28, 1:45 PM CDTSevere Thunderstorm WarningLIXLivingston60 min
May 28, 3:08 PM CDTSevere Thunderstorm WarningLIXSaint James67 min
May 28, 4:45 PM CDTSevere Thunderstorm WarningLIXLafourche15 min
May 28, 4:55 PM CDTTornado WarningLIXLafourche35 min
May 28, 6:31 PM CDTSevere Thunderstorm WarningLIXPointe Coupee29 min
May 28, 6:50 PM CDTSevere Thunderstorm WarningLIXWest Feliciana25 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 1997Every 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.