Alert archive / Louisiana / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 13, NWS New Orleans, LA
NWS New Orleans, LA issued this severe thunderstorm warning at Mar 17, 1987, 4:31 PM CST for Iberia Parish, Saint Martin Parish, St. Mary Parish, Louisiana. It was in force for 59 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
- Mar 17, 1987, 4:31 PM CST (22:31 UTC)
- Expired
- Mar 17, 1987, 5:30 PM CST
- In force
- 59 min
- Issued by
- NWS New Orleans, LA
- Area
- Whole counties
Counties Iberia Parish, LA, Saint Martin Parish, LA, St. Mary 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 |
|---|---|---|---|
| Mar 17, 4:40 PM CST | Thunderstorm Wind 0 | St. Mary, 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
Lake Charles Mun, LA (KLCH), launched 12:00Z, 10.5 hours before the alert went out and 156 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
- 133 J/kg
- Mixed-layer CIN
- -270 J/kg
- Mixed-layer LCL
- 658 m above ground
- 0-6 km bulk shear
- 52 kt
- 0-1 km storm-relative helicity
- 544 m²/s²
- 0-3 km storm-relative helicity
- 810 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.3
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KNEW 172231
SVRNEW
LAC045-099-101-172330-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
431 PM CST TUE MAR 17 1987
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL 530 PM CST FOR PEOPLE IN THE FOLLOWING COUNTIES...
IN SOUTHEAST LOUISIANA
...IBERIA...ST.MARTIN...ST.MARY
RADAR INDICATED A LINE OF SEVERE THUNDERSTORMS EXTENDING NORTH TO
SOUTH OVER THE EXTREME WEST PORTION OF ST MARTIN AND IBERIA PARISHES
AND MOVING EAST AT 20 MPH WITH INDIVIDUALS CELLS MOVING NORTHEAST
AT 40 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.
WHEN THUNDERSTORMS ARE OCCURRING...PEOPLE SHOULD MOVE INSIDE A
STRONG BUILDING. DO NOT STAND BY WINDOWS. DON'T USE TELEPHONES
OR ELECTRICAL APPLIANCES UNLESS IN AN EMERGENCY UNTIL THE STORM
HAS PASSED. MOTORISTS SHOULD NOT DRIVE INTO LOW WATER CROSSINGS.
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55
MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN.
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR
OF YOUR HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO
DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.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 17, 12:40 PM CST, 3 hours 51 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE NEW ORLEANS LA 1237 PM CST TUE MAR 17 1987 ...A TORNADO WATCH IS IN EFFECT FOR ALL OF SOUTHEAST LOUISIANA UNTIL 4 PM CST THIS TUESDAY AFTERNOON... SCATTERED THUNDERSTORMS...A FEW STRONG...WERE OCCURRING ACROSS CENTRAL LOUISIANA AND EXTENDED INTO SOUTHWEST MISSISSIPPI. THE THUNDERSTORMS WERE OCCURRING FROM MC COMB MISSISSIPPI TO JACKSON MISSISSIPPI WEST ACROSS THE MISSISSIPPI RIVER TO BETWEEN ALEXANDRIA AND SIMMESPORT LOUISIANA. THESE THUNDERSTORMS ARE CAPABLE OF PRODUCING STRONG GUSTY WINDS... DANGEROUS LIGHTNING...VERY HEAVY RAIN AND POSSIBLY SOME SMALL HAIL AS THEY MOVE RAPIDLY NORTHEAST AT 50 MILES AN HOUR. PERSONS IN THE WATCH AREA SHOULD REMAIN ALERT AND TAKE SHELTER IF THREATENING WEATHER IS SIGHTED. WIDELY SCATTERED SHOWERS WERE OCCURRING OVER SOUTHEAST LOUISIANA FROM SIMMESPORT SOUTH TO THE GULF COAST NEAR MORGAN CITY.
Special weather statement, Mar 17, 1:29 PM CST, 3 hours 2 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BATON ROUGE LA 130 PM CST TUE MAR 17 1987 ...A TORNADO WATCH REMAINS IN EFFECT UNTIL 4PM THIS AFTERNOON FOR ALL OF EAST CENTRAL LOUISIANA... RADAR SHOWED STRONG THUNDERSTORMS CONTINUED ACROSS CATAHOULA PARISH NEAR HARRISONBURG TO MARKSVILLE IN AVOYELLES PARISH TO EUNICE LOUISIANA IN ST LANDRY PARISH. DUE TO THE SLOW MOVEMENT OF THIS AREA...HEAVY RAIN WITH SOME FLOODING WILL OCCURE IN THE MENTIONED PARISHES. REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA. PEOPLE IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER' STATEMENTS AND POSSIBLE WARNINGS.
Special weather statement, Mar 17, 1:37 PM CST, 2 hours 54 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE NEW ORLEANS LA 137 PM CST TUE MAR 17 1987 ...A TORNADO WATCH IS IN EFFECT FOR ALL OF SOUTHEAST LOUISIANA UNTIL 4 PM CST THIS TUESDAY AFTERNOON... SCATTERED THUNDERSTORMS...A FEW WITH HEAVY RAIN...WERE OCCURRING ACROSS SOUTH CENTRAL AND SOUTHWEST MISSISSIPPI AND EXTENDED INTO A SMALL PART OF EAST CENTRAL LOUISIANA. THE THUNDERSTORMS WERE OCCURRING FROM JACKSON TO MCCOMB MISSISSIPPI WEST ACROSS THE MISSISSIPPI RIVER TO BETWEEN ALEXANDRIA AND SIMMESPORT LOUISIANA. THE THUNDERSTORMS ARE CAPABLE OF PRODUCING STRONG GUSTY WINDS..DANGEROUS LIGHTNING..VERY HEAVY RAIN AND POSSIBLY SOME SMALL HAIL. THE STORMS ARE MOVING RAPIDLY NORTHEAST AT 50 MILES AN HOUR. PERSONS IN THE WATCH AREA SHOULD REMAIN ALERT AND TAKE SHELTER IF THREATENING WEATHER IS SIGHTED. < ONLY WIDELY SCATTERED SHOWERS WERE OCCURRING OVER PARTS OF SOUTHEAST AND SOUTH CENTRAL LOUISIAN5A AT THIS TIME. HOWEVER...THUNDERSTORMS ARE EXPECTED TO DEVELOP OVER PARTS OF SOUTHEAST LOUISIANA WITHIN THE NEXT COUPLE OF HOURS.
Special weather statement, Mar 17, 2:44 PM CST, 1 hour 47 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BATON ROUGE LA 245 PM CST TUE MAR 17 1987 ...A TORNADO WATCH REMAINS IN EFFECT UNTIL 4PM THIS AFTERNOON FOR ALL OF EAST CENTRAL LOUISIANA... RADAR SHOWED STRONG THUNDERSTORMS FROM CONCORDIA PARISH SOUTH ACROSS AVOYELLES INTO ST LANDRY PARISH. OTHER STRONG THUNDERSTORMS WERE FROM DOWNTOWN BATON ROUGE NORTH TO CLINTON. THE STRONG THUNDERSTORMS WILL PRODUCE HEAVY RAINS CAUSING SOME FLOODING OF LOW AREAS ACROSS THE ABOVE PARISHES DURING THE AFTERNOON. SMALL HAIL WAS REPORTED IN THE SOUTHERN PART OF EAST BATON ROUGE PARISH DURING THE PAST HOUR. REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR TORNADOES AND SEVERE THUNDERSTORMsS IN AND CLOSE TO THE WATCH AREA. PEOPLE IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE WARNINGS.
Special weather statement, Mar 17, 3:00 PM CST, 1 hour 31 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE NEW ORLEANS LA 330 PM CST TUE MAR 17 1987 ...STRONG SOUTHEAST WINDS WILL CONTINUE TO PRODUCE TIDES WELL ABOVE NORMAL ALONG THE LOUISIANA COAST... A STRONG LOW PRESSURE SYSTEM..CENTERED OVER THE CENTRAL PLAIN STATES..IN COMBINATION WITH A HIGH PRESSURE SYSTEM..OVER THE ATLANTIC SEABOARD..IS PRODUCING STRONG SOUTH AND SOUTHEAST WINDS WINDS OVER THE GULF OF MEXICO. WINDS OF 25 TO 35 MPH WITH HIGHER GUSTS ARE PRODUCING 8 TO 12 FOOT SEAS OVER THE LOUISIANA COASTAL WATERS..AND TIDES OF 2 TO 4 FEET ABOVE NORMAL. RISING WATER HAS PRODUCED SOME MINOR FLOODING IN SOUTHEAST ORLEANS PARISH AND ALONG THE INTERCOASTAL WATERWAY. STRONG SOUTHEAST WINDS ARE EXPECTED TO PERSIST THROUGH TONIGHT AND MAY CAUSE TIDES TO RISE..IN SOME AREAS..AS MUCH AS 4 FEET ABOVE NORMAL BY WEDNESDAY MORNING. < RESIDENTS ALONG THE SOUTHEAST AND SOUTH LOUISIANA COASTS AND ALL MARINE INTERESTS SHOULD MONITOR FUTURE WEATHER FORECASTS FOR ADDITIONAL INFORMATION.
Special weather statement, Mar 17, 4:04 PM CST, 27 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BATON ROUGE LA 405 PM CST TUE MAR 17 1987 ...A TORNADO WATCH IS IN EFFECT UNTIL 10 PM THIS EVENING FOR ALL OF EAST CENTRAL LOUISIANA EXCEPT CATAHOULA PARISH... RADARS SHOWED A 25 MILE WIDE BAND OF STRONG THUNDERSTORMS FROM THE ACME AREA IN SOUTHERN CONCORDIA PARISH SOUTH ACROSS PARTS OF POINTE COUPEE...AVOYELLES AND INTO ST LANDRY PARISH. THE THUNDERSTORMS WILL PRODUCE HEAVY RAINS CAUSING SOME FLOODING OF LOW AREAS IN THE ABOVE PARISHES DURING THE AFTERNOON. THUNDERSTORMS WILL CONTINUE TO MOVE SLOWLY EASTWARD INTO THE EVENING HOURS. REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA. PEOPLE IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE WARNINGS.
The office that day
Everything else NWS New Orleans, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 17, 9:50 AM CST | Severe Thunderstorm Warning | LIX | Iberville, Pointe Coupee | 40 min |
| Mar 17, 10:05 AM CST | Severe Thunderstorm Warning | LIX | West Baton Rouge | 40 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.