Alert archive / Louisiana / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 39, NWS New Orleans, LA
NWS New Orleans, LA issued this severe thunderstorm warning at Nov 16, 1987, 2:52 PM CST for Ascension Parish, Louisiana. It was in force for 53 min.
The area
The counties it named.
The facts
- Issued
- Nov 16, 1987, 2:52 PM CST (20:52 UTC)
- Expired
- Nov 16, 1987, 3:45 PM CST
- In force
- 53 min
- Issued by
- NWS New Orleans, LA
- Area
- Whole counties
County Ascension 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, 8.9 hours before the alert went out and 175 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
- 1082 J/kg
- Mixed-layer CIN
- -27 J/kg
- Mixed-layer LCL
- 535 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 229 m²/s²
- 0-3 km storm-relative helicity
- 384 m²/s²
- Significant tornado parameter
- 0.9
- Supercell composite
- 7.5
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KBTR 162056 COR
SVRBTR
LAC001-005-063-091-162245-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BATON ROUGE LA
252 PM CST MON NOV 16 1987
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL 345 PM CST FOR PEOPLE IN THE FOLLOWING PARISHES...
IN EAST CENTRAL LOUISIANA
...ASCENSION...LIVINGSTON...ST HELENA
RADAR SHOWED A LINE OF NUMEROUS VERY STRONG THUNDERSTORMS FROM NORTH OF
GREENSBURG IN ST HELENA PARISH SOUTH ACROSS LIVINGSTON AND ASCENSION
PARISHES. THE LINE OF THUNDERSTORMS WAS MOVING TO THE EAST AT 35 MPH.
A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA. REMEMBER
SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES
WITH LITTLE OR NO ADVANCE WARNING. REMAIN CALM BUT BE ALERT TO
RAPIDLY CHANGING WEATHER CONDITIONS.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, Nov 16, 11:35 AM CST, 3 hours 17 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE NEW ORLEANS LA 1145 AM CST MON NOV 16 1987 ...TORNADO WATCH IN EFFECT FOR ASSUMPTION LOWER ST MARTIN ST MARY AND ADJOINING COASTAL WATERS IN SOUTHEAST LOUISIANA UNTIL 2 PM CST... WIDELY SCATTERED SHOWERS WERE OCCURRING FROM ATCHAFALAYA BAY NORTHEAST ACROSS HAMMOND TO BOGALUSA LOUISIANA. SCATTERED STGRONG THUNDERSTORMS WERE OCCURRING FROM JUST EAST OF VICKSBURG SOUTHWESAT ACROSS ALEXANDRIA LOUISIANA INTO EAST TEXAS. THUNDERSTORMS WERE MOVING NORTHEAST AT 30 MILES AN HOUR.
Special weather statement, Nov 16, 12:11 PM CST, 2 hours 41 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BATON ROUGE LA 1215 PM CST MON NOV 16 1987 ....A TORNADO WATCH IS IN EFFECT FOR ALL OF EAST CENTRAL LOUISIANA UNTIL 8 PM THIS MONDAY EVENING... RADAR SHOWED THE THUNDERSTORMS ACROS EAST CENTRAL LOUISIANA HAS DECREASED DURING THE PAST HOUR. HOWEVER...THUNDERSTORMS ARE DEVELOPING WEST OF THE AREA AND WILL MOVE EASTWARD ACROSS ALL OF EAST CENTRAL LOUISIANA DURING THE AFTERNOON AND EVENING. THUNDERSTORMS WILL PRODUCE HEAVY RAINS AND STRONG GUSTY WINDS OVER ALL OF EAST CENTRAL LOUISIANA THIS AFTERNOON AND EVENING. WIND GUST TO 46 MPH WAS RECORDED AT RYAN AIRPORT DURING THE PAST HOUR. PEOPLE IN EAST CENTRAL LOUISIANA SHOULD BE ALERT FOR SEVnERE WEATHER CONDITIONS FOR THE NEXT SEVERAL HOURS. ...A FLASH FLOOD WATCH IS IN EFFECT TODAY FOR A LARGE PART OF LOUISIANA INCLUDING AVOYELLES...CATAHOULA...CONCORDIA...AND ST LANDRY PARISHES...
Special weather statement, Nov 16, 12:47 PM CST, 2 hours 5 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE NEW ORLEANS LA 1245 PM CST MON NOV 16 1987 ...TORNADO WATCH IN EFFECT FOR ASSUMPTION LOWER ST MARTIN ST MARY TANGIPAHOA AND WASHINGTON AND ADJOINING COASTAL WATERS OF THE THE FOLLOWING PARISHES IBERIA AND ST MARY. ISOLATED SHOWERS AND THUNDERSTORMS CONTINUED IN SOUTHWEST MISSISSIPPI EAST CENTRAL AND SOUTHCENTRAL LOUISIANA AND THE COASTAL AREA OF SOUTHEAST MISSISSIPPI. A SOLID LINE OF STRONG THUNDERSTORMS EXTENDED FROM MONROE LOUISIANA SOUTH ACROSS ALEXANDRIA TO JENNINGS LOUISIANA. THE LINE WAS MOVING EAST AT 30 MILES AN HOUR. THUNDERSTORMS WERE MOVING NORTHEAST AT 30 MILES AN HOUR.
Special weather statement, Nov 16, 1:55 PM CST, 57 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE NEW ORLEANS LA 145 PM CST MON NOV 16 1987 ...TORNADO WATCH IN EFFECT FOR IBERIA LOWER ST MARTIN UPPER ST MARTIN ST MARY TANGIPAHOA AND WASHINGTON AND ADJOINING COASTAL WATERS OF THE FOLLOWING PARISHES IBERIA AND ST MARY UNTIL 8 PM CST. A SOLID LINE OF VERY STRONG THUNDERSTORMS EXTENDED FROM VICKSBURG MISSISSIPPI SOUTH ALONG THE MISSISSIPPI RIVER TO NATCHEZ AND CONTINUED SOUTH ACROSS SOUTHERN LOUISIANA TO LAFAYETTE TO THE COASTAL WATERS SOUTH OF LAFAYETTE. THE LINE WAS MOVING EAST AT 40 MILES AN HOUR. THESE THUNDERSTORMS ARE PRODUCING STRONG GUSTY WINDS...VERY HEAVY RAIN SMALL HAIL..DANGEROUS LIGHTNING AND POSSIBLE TORNADOES AS THEY MOVE EAST ACROSS THE AREA. PERSONS IN THE WATCH AREA SHOULD REMAIN ALERT AND IF THREATENING WEATHER IS SIGHTED GO TO A SAFE PLACE IMMEDIATELY. ELSEWHERE SCATTERED SHOWERS AND THUNDERSTORMS CONTINUED OVER SOUTHERN MISSISSIPPI AND SOUTHEAST LOUISIANA.
Special weather statement, Nov 16, 2:04 PM CST, 48 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BATON ROUGE LA 205 PM CST MON NOV 16 1987 ....A TORNADO WATCH IS IN EFFECT FOR ALL OF EAST CENTRAL LOUISIANA UNTIL 8 PM THIS MONDAY EVENING... RADAR SHOWED A VERY STRONG LINE OF THUNDERSTORMS FROM THE LOUISIANA- MISSISSIPPI BORDER NORTH OF BATON ROUGE...SOUTHWEST ACROSS EAST AND WEST FELICIANA PARISHES...INTO POINTE COUPEE AND IBERVILLE PARISHES. THE THUNDERSTORMS WERE MOVING EAST AT 25 MPH. THE THUNDERSTORMS HAVE PRODUCE HEAVY RAINS AND DAMAGING WINDS OVER A LARGE PART OF EAST CENTRAL LOUISIANA DURING THE PAST SEVERAL HOURS. PEOPLE IN EAST CENTRAL LOUISIANA SHOULD BE ALERT FOR SEVERE WEATHER UNTIL THE THUNDERSTORMS PASS YOUR AREA. ...A FLASH FLOOD WATCH IS IN EFFECT TODAY FOR A LARGE PART OF LOUISIANA INCLUDING AVOYELLES...CATAHOULA...CONCORDIA...AND ST LANDRY PARISHES...
Special weather statement, Nov 16, 2:47 PM CST, 5 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE NEW ORLEANS LA 245 PM CST MON NOV 16 1987 ...TORNADO WATCH IN EFFECT FOR IBERIA LOWER ST MARTIN UPPER ST MARTIN ST MARY TANGIPAHOA AND WASHINGTON AND ADJOINING COASTAL WATERS OF THE FOLLOWING PARISHES IBERIA AND ST MARY UNTIL 8 PM CST. A SOLID LINE OF VERY STRONG THUNDERSTORMS EXTENDED FROM JUST WEST OF JACKSON MISSISSIPPI SOUTH TO JUST WEST OF MC COMB MISSISSIPPI TO BATON ROUGE TO MORGAN CITY TO VERMILION BAY. THE LINE WAS MOVING EAST AT 40 MILES AN HOUR. THESE THUNDERSTORMS ARE PRODUCING STRONG GUSTY WINDS...VERY HEAVY RAIN SMALL HAIL..DANGEROUS LIGHTNING AND POSSIBLE TORNADOES AS THEY MOVE EAST ACROSS THE AREA. PERSONS IN THE WATCH AREA SHOULD REMAIN ALERT AND IF THREATENING WEATHER IS SIGHTED GO TO A SAFE IMMEDIATELY. ELSEWHERE SCATTERED SHOWERS AND THUNDERSTORMS CONTINUED ACROSS SOUTHERN MISSISSIPPI AND SOUTHEAST LOUISIANA.
The office that day
Everything else NWS New Orleans, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 15, 10:45 PM CST | Severe Thunderstorm Warning | LIX | Avoyelles, Catahoula, Concordia | 60 min |
| Nov 16, 12:00 AM CST | Severe Thunderstorm Warning | LIX | Catahoula, Concordia | 60 min |
| Nov 16, 8:15 AM CST | Flash Flood Warning | LIX | Catahoula | 4 hr |
| Nov 16, 12:20 PM CST | Severe Thunderstorm Warning | LIX | Avoyelles, Saint Landry | 70 min |
| Nov 16, 12:40 PM CST | Flash Flood Warning | LIX | Catahoula, Concordia | 4 hr |
| Nov 16, 12:55 PM CST | Severe Thunderstorm Warning | LIX | Concordia, Pointe Coupee, West Feliciana | 65 min |
| Nov 16, 12:55 PM CST | Severe Thunderstorm Warning | LIX | Iberville | 65 min |
| Nov 16, 2:15 PM CST | Severe Thunderstorm Warning | LIX | East Baton Rouge, East Feliciana, Iberville, West Baton Rouge | 60 min |
| Nov 16, 2:52 PM CST | Severe Thunderstorm Warning | LIX | Livingston, Saint Helena | 53 min |
| Nov 16, 3:02 PM CST | Severe Thunderstorm Warning | LIX | Assumption, Iberia, Saint Martin, St. Mary | 58 min |
| Nov 16, 3:50 PM CST | Severe Thunderstorm Warning | LIX | Ascension, Livingston | 40 min |
| Nov 16, 4:37 PM CST | Tornado Warning | LIX | Washington | 68 min |
| Nov 16, 5:52 PM CST | Tornado Warning | LIX | Lafourche, Saint Charles | 68 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.