Alert archive / Louisiana / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 41, NWS New Orleans, LA
NWS New Orleans, LA issued this severe thunderstorm warning at Nov 16, 1987, 3:50 PM CST for Ascension Parish, Livingston Parish, Louisiana. It was in force for 40 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
- Nov 16, 1987, 3:50 PM CST (21:50 UTC)
- Expired
- Nov 16, 1987, 4:30 PM CST
- In force
- 40 min
- Issued by
- NWS New Orleans, LA
- Area
- Whole counties
Counties Ascension Parish, LA, Livingston Parish, LA
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Nov 16, 4:20 PM CST | Thunderstorm Wind 0 | Ascension, 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. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.
The nearest sounding before it
Boothville, LA (KBVE), launched 12:00Z, 9.8 hours before the alert went out and 176 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
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
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, 12:11 PM CST, 3 hours 39 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, 3 hours 3 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, 1 hour 55 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, 1 hour 46 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, 1 hour 3 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.
Special weather statement, Nov 16, 3:16 PM CST, 34 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BATON ROUGE LA 315 PM CST MON NOV 16 1987 ....THE TORNADO WATCH HAS BEEN CANCELLED FOR AVOYELLES...CATAHOULA... CONCORDIA...POINTE COUPEE...ST LANDRY...AND WEST FELICIANA. THE WATCH REMAINS IN EFFECT FOR THE REMAINDER OF EAST CENTRAL LOUISIANA... A SEVERE THUNDER STORM WARNING IS IN EFFECT UNTIL 345 PM CST FOR PEOPLE IN ASCENSION...LIVINGSTON AND ST HELENA PARISHES. THE LINE OF VERY STRONG THUNDERSTORMS WAS LOCATED FROM NEAR GREENSBURG SOUTH ACROSS LIVIMGSTON AND ASCENSION PARISHES. THIS LINE OF THUNDERSTORMS WAS MOVING EAST AT 35 MPH. THESE THUNDERSTORMS CONTINUE TO PRODUCE HEAVY RAINS AND DAMAGING WINDS OVER PARTS 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...CATA"HOULA...CONCORDIA...AND ST LANDRY.
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, 2:52 PM CST | Severe Thunderstorm Warning | LIX | Ascension | 53 min |
| Nov 16, 3:02 PM CST | Severe Thunderstorm Warning | LIX | Assumption, Iberia, Saint Martin, St. Mary | 58 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.