Alert archive / Louisiana / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 14, NWS New Orleans, LA
NWS New Orleans, LA issued this severe thunderstorm warning at Mar 17, 1987, 9:09 PM CST for Saint Tammany Parish, Washington Parish, Louisiana. It was in force for 66 min. 2 reports 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, 9:09 PM CST (03:09 UTC)
- Expired
- Mar 17, 1987, 10:15 PM CST
- In force
- 66 min
- Issued by
- NWS New Orleans, LA
- Area
- Whole counties
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, 9:30 PM CST | Thunderstorm Wind 0 | St. Tammany, LA | |
| Mar 17, 9:40 PM CST | Thunderstorm Wind 0 | Washington, 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 00:00Z, 3.2 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
- 937 J/kg
- Mixed-layer CIN
- -48 J/kg
- Mixed-layer LCL
- 541 m above ground
- 0-6 km bulk shear
- 57 kt
- 0-1 km storm-relative helicity
- 526 m²/s²
- 0-3 km storm-relative helicity
- 619 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 14.7
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, Mar 17, 5:17 PM CST, 3 hours 52 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BATON ROUGE LA 520 PM CST TUE MAR 17 1987 ...THE TORNADO WATCH IS CANCELLED FOR AVOYELLES...CONCORDIA...AND ST LANDRY PARISHES...THE TORNADO WATCH CONTINUES UNTIL 10 PM FOR THE REMAINDER OF EAST CENTRAL AND SOUTHEAST LOUISIANA... RADARS SHOWED A 20 MILE WIDE BAND OF STRONG THUNDERSTORMS ALONG THE MISSISSIPPI RIVER NEAR NATCHEZ SOUTH ACROSS POINTE COUPEE AND IBERVILLE PARISHES. THE AREA OF THUNDERSTORMS WAS MOVING SLOWLY EAST AND WILL PRODUCE HEAVY RAINS CAUSING SOME FLOODING OF STREETS...UNDERPASSES AND OTHER LOW AREAS...ESPECIALLY IN METROPOLITAN BATON ROUGE FOR THE NEXT SEVERAL 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.
Special weather statement, Mar 17, 5:41 PM CST, 3 hours 28 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE NEW ORLEANS LA 535 PM CST TUE MAR 17 1987 ...TORNADO WATCH IS IN EFFECT FOR ALL OF SOUTHEAST LOUISIANA UNTIL 10PM THIS EVENING... STRONG THUNDERSTORMS WERE OCCURRING FROM THE COAST SOUTH OF LAFAYETTE...NORTHEAST ACROSS THE BATON ROUGE AREA TO NEAR FAYETTE MISSISSIPPI. STRONG GUSTY WINDS...FREQUENT LIGHTNING...LOCALLY HEAVY RAIN...AND HAIL MAY ACCOMPANY THESE THUNDERSTORMS AS THEY MOVE NORTHEAST AT 45 MILES AN HOUR. ELSEWHERE...LESS INTENSE THUNDERSTORMS AND SHOWERS CONTINUED OVER SOUTHEAST AND SOUTH CENTRAL LOUISIANA AND SOUTHERN MISSISSIPPI. THE ACTIVITY OVER SOUTHEAST LOUISIANA WAS STILL GENERALLY WEST OF LA KE MAUREPAS.
Special weather statement, Mar 17, 6:16 PM CST, 2 hours 53 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BATON ROUGE LA 615 PM CST TUE MAR 17 1987 ...THE TORNADO WATCH CONTINUES IN EFFECT FOR EAST BATON ROUGE AND SURROUNDING PARISHES UNTIL 10 PM... NO SEVERE WEATHER HAD BEEN REPORTED IN THE PAST HOUR. RADAR SHOWED A 20 MILE WIDE BAND OF STRONG THUNDERSTORMS FROM NEAR CLINTON IN EAST FELICIANA PARISH...TO BATON ROUGE CONTINUING SOUTHWEST ACROSS WEST BATON ROUGE AND IBERVILLE PARISHES. MOVEMENT WAS SOUTHEAST ABOUT 20 MPH. THEY WILL PRODUCE HEAVY RAIN WHICH WILL CAUSE SOME FLOODING OF STREETS...UNDERPASSES AND OTHER LOW AREAS... ESPECIALLY IN METROPOLITAN BATON ROUGE...FOR THE NEXT FEW HOURS. REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARAE 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, 7:14 PM CST, 1 hour 55 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BATON ROUGE LA 715 PM CST TUE MAR 17 1987 ...THE TORNADO WATCH CONTINUES IN EFFECT FOR EAST BATON ROUGE AND SURROUNDING PARISHES UNTIL 10 PM... NO SEVERE WEATHER HAD BEEN REPORTED IN THE PAST HOUR. RADAR SHOWED STRONG THUNDERSTORMS FROM EAST FELICIANA...ST HELENA PARISHES SOUTH INTO EAST BATON ROUGE...LIVINGSTON...IBERVILLE AND ASCENSION PAEISHES. THE THUNDERSTORMS WERE MOVING SLOWLY TO THE EAST ...PRODUCEING HEAVY RAIN AND STRONG GUSTY WIND. THE HEAVY RAIN WILL CAUSE FLOODING OF STREETS...UNDERPASSES AND OTHER LOW AREAS FOR THE NEXT FEW 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.
Special weather statement, Mar 17, 7:30 PM CST, 1 hour 39 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BATON ROUGE LA 730 PM CST TUE MAR 17 1987 ...THE TORNADO WATCH IS CANCELLED FOR EAST BATON ROUGE...EAST FELICIANA IBERVILLE...POINTE COUPEE...WEST BATON ROUGE...AND WEST FELICIANA PARISHES. THE TORNADO WATCH REMAINS IN EFFECT FOR ASCENSION...ST HELENA...AND LIVINGSTON PARISHES AS WELL AS OTHER PARTS OF SOUTHEAST LOUISIANA UNTIL 10 PM... RADAR SHOWED STRONG THUNDERSTORMS FROM ST HELENA PARISH SOUTH INTO LIVINGSTON AND ASCENSION. THE THUNDERSTORMS WERE MOVING EAST AT 20 MPH AND WILL PRODUCE HEAVY RAIN AND STRONG GUSTY WINDS. THE HEAVY RAIN WILL CAUSE FLOODING OF STREETS...UNDERPASSES AND OTHER LOW AREAS FOR NEXT FEW HOURS. OTHER THUNDERSTORMS AND PATCHES OF RAIN COVERED PARTS OF EAST CENTRAL LOUISIANA. 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, 8:30 PM CST, 39 minutes before
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</html>The office that day
Everything else NWS New Orleans, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 17, 8:25 PM CST | Tornado Warning | LIX | Tangipahoa | 65 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.