Alert archive / Louisiana / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 21, NWS New Orleans, LA
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.
- 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
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.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 29, 12:10 PM CST | Severe Thunderstorm Warning | LIX | Jefferson, Saint Charles | 60 min |
| Mar 29, 2:15 PM CST | Severe Thunderstorm Warning | LIX | Orleans, Saint Bernard, Saint Tammany | 60 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.