Alert archive / Louisiana / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 14, NWS New Orleans, LA

March 17, 1987Saint Tammany Parish, Washington Parish, Louisiana

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

Counties Saint Tammany Parish, LA, Washington 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

TimeReportWhereRemark
Mar 17, 9:30 PM CSTThunderstorm Wind 0St. Tammany, LA
Mar 17, 9:40 PM CSTThunderstorm Wind 0Washington, 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.

Skew-T log-pSkew-T log-p diagram, Boothville, LA at 00:00Z on 1987-03-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 937 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Boothville, LA at 00:00Z on 1987-03-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 526 square meters per square second.1939587897117Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
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

Open this sounding in Storm Lab

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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The office that day

Everything else NWS New Orleans, LA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 17, 8:25 PM CSTTornado WarningLIXTangipahoa65 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.