Alert archive / Louisiana / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 21, NWS New Orleans, LA

March 29, 1987Orleans Parish, Saint Tammany Parish, Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at Mar 29, 1987, 1:15 PM CST for Orleans Parish, Saint Tammany Parish, Louisiana. It was in force for 60 min.

The area

The counties it named.

The facts

Issued
Mar 29, 1987, 1:15 PM CST (19:15 UTC)
Expired
Mar 29, 1987, 2:15 PM CST
In force
60 min
Issued by
NWS New Orleans, LA
Area
Whole counties

Counties Orleans Parish, LA, Saint Tammany Parish, LA

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Boothville, LA (KBVE), launched 12:00Z, 7.3 hours before the alert went out and 114 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, Boothville, LA at 12:00Z on 1987-03-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 910 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, Boothville, LA at 12:00Z on 1987-03-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 66 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
910 J/kg
Mixed-layer CIN
-55 J/kg
Mixed-layer LCL
531 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
66 m²/s²
0-3 km storm-relative helicity
66 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 291950
SVRNEW
LAC071-103-292015-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING...CORRECTION..
NATIONAL WEATHER SERVICE NEW ORLEANS LA
115 PM CST SUN MAR 29 1987

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL 215 PM CST FOR PEOPLE IN THE FOLLOWING PARISHES:

IN SOUTHEAST LOUISIANA
  ..ORLEANS AND ST. TAMMANY..

AT 110 PM CST RADAR INDICATED A SEVERE THUNDERSTORM OVER ORLEANS
PARISH NEAR LAKE PONCHARTRAIN. 1/4 TO 1/2 INCH HAIL HAS BEEN REPORTED
WITH THIS STORM. THIS STORM WAS MOVING AT NORTHEAST AT 35 MPH AND
SHOULD AFFECT ST. TAMMANY PARISH WITHIN THE NEXT 20 MINUTES.

RESIDENTS SHOULD BE PREPARED TO SEEK COVER. STRONG DAMAGING WINDS..
DANGEROUS LIGHTNING..AND HEAVY RAINS ARE POSSIBLE WITH THIS STORM.
A TORNADO WATCH CONTINUES IN EFFECT ACROSS SOUTHEAST LOUISIANA UNTIL
6 PM CST.

THIS IS THE 3RD RETRANSMISSION AT THE REQUEST OF SMCC..

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, Mar 29, 9:35 AM CST, 3 hours 40 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE NEW ORLEANS LA
940 AM CST SUN MAR 29 1987

A STRONG THUNDERSTORM HAD DEVELOPED OVER THE SOUTHEAST LOUISIANA
WATERS ABOUT 50 MILES SOUTH OF MORGAN CITY. THIS STORM WILL MOVE INTO
TERREBONNE BAY AND TIMBALIER BAY WITHIN THE NEXT HOUR AND WILL
LIKELY PRODUCE STRONG GUSTY WINDS...ROUGH SEAS...SOME SMALL HAIL...
VERY HEAVY RAIN...AND DANGEROUS LIGHTNING.

ELSEWHERE...ISOLATED SHOWERS AND THUNDERSTORMS CONTINUED OVER SOUTHWEST
ALABAMA AND EXTREME SOUTHEAST MISISSIPPI AND EXTENDED SOUTH INTO THE
COASTAL WATERS.
Special weather statement, Mar 29, 10:58 AM CST, 2 hours 17 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BATON ROUGE LA
11 AM CST SUN MAR 29 1987

THE TRAVELERS ADVISORY FOR EAST CENTRAL LOUISIANA HAS BEEN CANCELLED.
CONDITIONS HAVE IMPROVED.
Special weather statement, Mar 29, 11:25 AM CST, 1 hour 50 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BATON ROUGE LA
1125 AM CST SUN MAR 29 1987

...STRONG THUNDERSTORMS ARE MOVING ACROSS PARTS OF EAST CENTRAL
LOUISIANA...

RADAR SHOWED A LARGE AREA OF STRONG THUNDERSTORMS WITH VERY HEAVY RAIN
EXTENDING FROM ALEXANDRIA ACROSS AVOYELLES...ST LANDRY...POINTE COUPEE
...WEST FELICIANA...WEST BATON ROUGE AND IBERVILLE PARISHES.  THE
THUNDERSTORMS WERE MOVING NORTHEAST AT 40 MPH.

THESS THUNDERSTORM W5ILL MOVE THROUGH EAST CENTRAL LOUISIANA DURING THE
NEXT TWO TO THREE HOURS AND WILL LIKELY HAVE STRONG GUSTY WINDS WITH
VERY HEAVY RAIN...DANGEROUS LIGHTNING AND POSSIBLY SOME SMALL HAIL.
Special weather statement, Mar 29, 11:28 AM CST, 1 hour 47 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BATON ROUGE LA
1125 AM CST SUN MAR 29 1987

...STRONG THUNDERSTORMS WERE MOVING ACROSS PARTS OF EAST CENTRAL
LOUISIANA...

RADAR SHOWED A LARGE AREA OF STRONG THUNDERSTORMS WITH VERY HEAVY RAIN
EXTENDING FROM ALEXANDRIA ACROSS AVOYELLES...ST LANDRY...POINTE COUPEE
...WEST FELICIANA...WEST BATON ROUGE AND IBERVILLE PARISHES.  THE
THUNDERSTORMS WERE MOVING NORTHEAST AT 40 MPH.

THESE THUNDERSTORMS8 WILL MOVE THROUGH EAST CENTRAL LOUISIANA DURING THE
NEXT TWO TO THREE HOURS AND WILL LIKELY HAVE STRONG GUSTY WINDS WITH
VERY HEAVY RAIN...DANGEROUS LIGHTNING AND POSSIBLY SOME SMALL HAIL.
Special weather statement, Mar 29, 11:38 AM CST, 1 hour 37 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1120 AM CST SUN MAR 29 1987

...STRONG ARCTIC AIRMASS PLUNGING SOUTHEAST INTO THE BAYOU STATE...
...FREEZE WARNING IS IN EFFECT FOR NORTHWEST LOUISIANA TONIGHT...
...STRONG THUNDERSTORMS HEADING NORTHEAST TOWARD SOUTHEAST LOUISIANA
   THIS AFTERNOON.

AN UNSEASONABLY STRONG ARCTIC COLD FRONT IS BEGINNING TO INVADE THE
NORTHWEST SECTION OF THE STATE LATE THIS MORNING. UNSEASONABLY
COLD AIR IS SWEEPING SOUTHEASTWARD OUT OF THE CENTRAL PLAINS
ACCOMPANIED BY NORTH WINDS OF 20 TO 30 MPH WITH STRONGER GUSTS.
TEMPERATURES HAVE ALREADY TUMBLED INTO THE LOW TO MID 40S IN THE
NORTHWEST CORNER OF THE STATE AND SHOULD CONTINUE TO FALL INTO THE
30S DURING THE AFTERNOON AS THE ARTIC AIRMASS SURGES SOUTH OVER
THE NORTHERN HALF OF THE STATE THIS AFTERNOON AND TONIGHT. TEMPERATURES
SHOULD PLUNGE TO RECORD OR NEAR RECORD LOWS BY DAYBREAK MONDAY OVER
THE NORTHERN AND WESTERN SECTIONS OF THE STATE.
RESIDENTS OF NORTHWEST LOUISIANA SHOULD TAKE PRECAUTIONS TO PROTECT
PLANTS AND TENDER VEGETATION AGAINST THE UNSEASONABLY COLD WEATHER.
NURSERY GROWERS SHOULD ALSO MAKE PLANS TO PROTECT THEIR FREEZE-
SENSITIVE PLANTS.  AS THE ARCTIC AIRMASS BECOMES ENTRENCHED OVER
THE REMAINDER OF THE STATE MONDAY AND MONDAY NIGHT FREEZING
TEMPERATURES MAY OCCUR ACROSS THE ENTIRE STATE EXCEPT THE
IMMEDIATE COASTAL AREAS BY LATE MONDAY NIGHT. THIS WILL LIKELY
BE A RECORD-BREAKING COLD SNAP FOR MOST OF THE STATE. LOW
TEMPERATURES WILL RANGE FROM THE MID TO UPPER 20S IN THE NORTH
MONDAY NIGHT.  AGRICULTURAL INTERESTS ARE ADVISED TO TAKE NECESARY
PRECAUTIONS TO PROTECT YOUNG LIVESTOCK AND TENDER VEGETATION.
SLEET AND SNOW ARE POSSIBLE ACROSS THE NORTHWESTERN PART
OF LOUISIANA LATER TONIGHT.

STRONG THUNDERSTORMS HAVE DEVELOPED SOUTH OF THE CENTRAL AND SOUTHEAST
LOUISIANA COAST DURING THE PAST COUPLE OF HOURS AND WILL SPREAD
NORTHEAST ACROSS SOUTH CENTRAL AND SOUTHEAST LOUISIANA WITHIN TEHE NEXT
SEVERAL HOURS. RESIDENTS IN THE SOUTH CENTRAL AND SOUTHEAST LOUISIANA
SHOULD BRACE FOR STRONG POSSIBLY SEVERE THUNDERSTORMS WITH HEAVY RAINFALL
...STRONG GUSTY WINDS...HAIL AND DANGEROUS LIGTHNING OVER THE NEXT
FEW HOURS.

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 29, 12:10 PM CSTSevere Thunderstorm WarningLIXJefferson, Saint Charles60 min
Mar 29, 2:15 PM CSTSevere Thunderstorm WarningLIXOrleans, Saint Bernard, Saint Tammany60 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 1987Every severe thunderstorm warning in 1987

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.